Control Valve Performer

Introduction to Control Valve Performer app

What is control valve performance curve?

Every process plant consists of four main components, 1) devices which generates the flow 2) devices which carry the fluid from one location to other, 3) devices which control the quantity of fluid flow and 4) devices which combines different fluids and generates the required product. The most common control element in the process control industries is the control valve. The control valve manipulates a flowing fluid to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point. Control valves are playing a vital role in modern manufacturing process industries around the world to generate quality products.

The flow rate through a valve is controlled by manipulating the amount of open passage available for fluid flow. The amount of available fluid passage varies from 0 % (fully closed) to 100 % (fully open). The flow passage variations are achieved by a set of fixed and moving elements (also referred as valve trim) in control valve.

The relationship between valve stem (moving parts) position and the flow rate through a control valve is described by a curve called the valve's flow characteristic curve, or simply the valve characteristic. Typically, these characteristics are plotted on a curve where the horizontal axis is labeled in percent travel and the vertical axis is labeled as percent flow.

Control valve trim design and performance curve

The synergy between what is demanded and what is supplied by the valve can be achieved by re-shaping the valve trim to get desired valve characteristics. The operating parts of a valve which are normally exposed to the process fluid are referred to as 'valve trim'. Usually parts like stem, plug, disc, seating surface etc. are called as valve trim. Valve trim is the physical shape of the plug and seat arrangement. The shape of the valve plug determines the flow characteristics of the valve.

Different valve characterizations may be achieved by re-shaping the valve trim. For instance, the plug profiles of a stem-guided globe valve may be modified to achieve the common quick-opening, linear, and equal-percentage characteristics. The inherent characteristic curve is a plot of the percent of valve opening vs. the percent of maximum flow coefficient (CV). This is determined by measuring the flow rate at various positions of valve travel with a fixed differential pressure across the valve. The CV value is calculated at each valve position using a form of the generalized Control Valve CV equation.

Quick Open : A quick opening valve plug produces a large increase in flow for a small initial change in stem travel. Near maximum flow is reached at a relatively low percentage of maximum stem lift. Quick open plugs are used for on-off applications designed to produce maximum flow quickly.

Linear : The equal percentage valve plug produces the same percentage change in flow per fixed increment of valve stroke at any location on its characteristic curve. The equal percentage is the characteristic most commonly used in process control.

Equal Percentage : An inherently linear characteristic produces equal changes in flow per unit of valve stroke regardless of plug position. Linear plugs are used on those systems where the valve pressure drop is a major portion of the total system pressure drop.

Need for different trim design and characteristic curves

A control valve is a part of the complete fluid flow system. The fluid flow system may include other components like a pump, heat exchanger, reactor, piping etc. Considering all other components in the system, it is necessary to achieve desired flow characteristic curve. This is referred as installed valve characteristics.

Imagine that the process needs a linear increase in the flow rate. As pressure drop is the function of flow rate, the system pressure drop might be linear or non-linear depending on various components in the complete flow system. In case if system pressure drop is also linear, a linear characteristic curve will satisfy the purpose. But in case if the system pressure drop is non-linear, we may need to go for quick opening or equal percentage control valve.

Hence, control valve trim is designed and manufactured in a variety of different characteristics to provide the desired installed behavior.

Computational Fluid Dynamics and performance curve

In order to select an appropriate control valve for process control, it is necessary to estimate the characteristic curve of each valve. The control valve design starts with a required maximum value of valve coefficient and its variation with the percentage of opening. Every valve design goes through design variation to satisfy required performance curve. Performance curve can be evaluated by measuring a flow rate vs. valve opening in a physical test setup. Doing such studies for each design variation is very time consuming and costly. Computational Fluid Dynamics is an effective alternative to evaluate performance curve during design stage for the control valve.

Computational Fluid Dynamics or simply CFD is an art/method/science/technique of solving mathematical equations governing different physics including a flow of fluid, a flow of heat, chemical reactions, phase change and many other phenomena. When applied to control valve performance curves estimation, it's about the solution of water flow equations in a control valve at various opening conditions. It helps valve designers to quickly calculate the valve coefficient, understand flow behavior inside the valve and to optimize the design for required valve characteristics.

Traditionally, CFD is considered as three step processes, viz. pre-processing, solving and post-processing the results. In case of control valve performance curve evaluation, pre-processing involves creating 3D CAD model of a control valve, preparing CAD model for CFD meshing, creating a mesh inside a valve, creating solution setup and solution of flow equations. After the solution of flow equations, flow rate across inlet and outlet of a valve is calculated to get valve coefficient. This process is then repeated for different opening position to get a performance curve.

Few of the major obstacles for using CFD in control valve performance calculation includes the complexity of valve geometry, compute power and time required for multiple opening conditions.

What is Control Valve Performer app?

In a traditional way, calculating control valve performance curve using CFD involves the following process.

  1. For each opening position, creating 3D CAD model of control valve, extracting fluid domain and creating a CFD mesh.
  2. Doing required CFD setup and conducting analysis for number of opening conditions (typically between 5 to 10 depending on the accuracy of performance curve required).
  3. Combining a valve coefficient value and generating a performance curve

The process needs CFD expertise, its compute-intensive and typically takes days to complete.

Control Valve Performer (CVP) is a cloud-based Software-as-a-Service (SaaS) from simulationHub, that uses CFD (Computational Fluid Dynamics) as a tool to simulate and plot the flow characteristic curve of a control valve. CVP is developed specially for design engineers and manufacturers to help them simulate the performance of their design, without having any knowledge of CFD. The app only needs a control valve geometry, number of opening conditions and flow direction. All CFD setup, calculation, and result extracted is automated using specifically written algorithms for control valve performance evaluation.

All CFD computations are done using cloud computing. The app does not need any high-end local machine and even can be used from mobile / tablet devices. Once the setup is submitted from computation, ready-to-use valve performance PDF report is generated within minutes. The report includes all setup information, a valve characteristic curve, and more detailed CFD results. CVP application supports performance evaluation of rotary, lift and on/off type valves.

User interface

Following are the major components of Control Valve Performance app interface:

Simulation details and help toggle button : Access the simulation details, help and support menu. This allows opening the simulation details page. A quick link to help items like getting started guide, video library and forum is given. You can also raise the support ticket for opened simulation.
Simulation stage navigation toggle button : This button toggles the stage navigation menu of left.
Navigation menu for an individual stage : A typical simulation includes a number of main stages. Each main stage includes a number of sub-stages. For example, the location and wind condition stage has two sub-stages, location & wind rose and wind conditions for simulation. Navigation menu for an individual stage is available in the left navigation panel. Individual stage menus will change depending on the stage you have opened. For example, in result stage, you can view comfort plot, flow lines, surface pressure, contour plots etc. Clicking on each sub-stage will open the respective sub stage options. This menu follows stage dependency and color coding.
Previous & next stage access : A quick access link is given to go to previous or next simulation stage. The access to the next stage is deactivated until the current stage is completed. This menu follows stage dependency.
Stage quick access : Stage quick access is available at bottom of stage navigation panel. This quick access helps to navigate between main simulation stages. This menu follows stage dependency and color coding.
View cube : Use the View cube to orbit your design or view the design from standard view positions. If you hover on the view cube, you can see a drop-down icon at a bottom right corner with more view options.
Model view controls and settings : The model view controls contain commands used to zoom, pan, and orbit your design. The display settings control the appearance of the interface and how a model is displayed in the graphics window. You can also take the snapshot of what is displayed in the graphics window.
Model click menu : Left-click to select the object in the graphics window. Right-click to access the model menu. The model menu contains commands like to isolate, hide selected, show all objects. Left click anywhere in the graphics window to hide the model menu.
Results quick access menu : Results quick access menu is available when you open the result stage of simulation. This quick access menu helps to navigate to different results without using left navigation panel. Quick access menu contains commands to go to results like comfort plot, flow lines, contour plots etc.
Profile and help : In profile, you can control your profile and account settings, or use the help menu to continue your learning or get help in troubleshooting. This menu also contains a quick link to the dashboard. Use full-screen icon if you wish to use the app in full-screen mode.

simulationHub Apps Anywhere
Mobile device modifications

View cube 6 and result quick access 9 menus are not available on mobile and tablet. A profile and help menu 10 is modified for mobile and tablet devices. You will see raise ticket and sign out buttons in the profile and help menu. Model view control and settings 7 menus are also modified and available with fewer options.

Stage dependency and color coding

All the simulation stages are arranged in the sequential way they are executed. Every stage is dependent on the status of its previous stage. If the previous stage is not completed/failed, the stage will not be activated. This helps to complete the simulation stages in a sequential manner and avoid input errors.

The status of every stage/sub-stage is represented by unique colors. Green color indicates running stage, blue color indicates completed stage, black color indicated active stage, light grey color indicated deactivated stage and red color indicated the failed stage.

Create simulation

Start new "Control Valve Performer" simulation by following 3 easy steps:

Create new simulation : Click the "Create New Simulation" button on the dashboard. This will open up "Create New Simulation" popup window. (NOTE: The button will be deactivated in case if you do not have valid app subscription.)
Simulation details

a. Simulation name : Provide a unique simulation name and a short description of your simulation(150 characters) in given fields.

b. App : Select 'Control Valve Performer' from the drop-down menu. If you have only one app subscription, the app will automatically be selected in template drop-down. In the case of multiple app subscriptions, select the app template.

c. Select valve type : Control Valve Performer app can be used to evaluate the performance of both Control (Regulating/Modulating) valves and ON/OFF (Isolation) valves. By default, "Control valve" is selected. Click the valve type drop-down to change valve type.

d. Select motion type : This option is only available when 'Control valve' is selected as the valve type. Select the motion type 'Rotation' for quarter turn valves and 'Lift' for linear/multi-turn valves.

Create simulation : Click "Create Simulation" button. This will create a new simulation with provided details and open a 3D-Viewer for the upcoming steps.

Geometry stage

Once a new simulation is created, you will be directed to the geometry stage. This is the first step towards running a CFD simulation in Control valve performer app.

Follow below steps to get you geometry in a simulation project.

Input CAD model : Click "Input CAD Model" in valve geometry and settings stage. This will direct you to sub-stage menu for the input CAD model.
Browse : If you have the geometry available on your local computer, click the "Browse" button. This will open an "Upload Local Geometry" dialog box. (NOTE: If you have geometry available on cloud storage, provide the link to geometry file and click upload. Currently, only Amazon S3 cloud storage links are supported).
Choose a file : Click on "Choose a file to upload" button to open a file browser. The app currently supports ipt, .IGES, .STEP, .SAT file formats. Select the file and click "Open" in a file browser. The selected file name will appear below the button.

For Control Valves, the geometry should be uploaded in the fully closed position.
For ON/OFF Valves, the geometry should be uploaded in the fully open position.

Upload : Click "Upload" button to upload the file to your simulation. The time required to upload the file will depend on the size of a file. Once the file is uploaded, the 3D viewer will show the geometry and will direct you to the next stage. You can notice that the geometry stage is marked completed (blue color) in the stage quick access menu available at bottom of stage navigation panel.

Selection of moving parts

To get the performance curve for rotating or lift control valve, the user needs to define valve opening conditions. Opening settings define moving parts of valve trim, an axis along which parts will move and the number of opening conditions

Moving Part Settings : Click "Moving Part Settings" in main Valve Geometry and Settings stage. This will direct you to sub-stage menu for selecting moving parts of a control valve.
Start selection : In this stage, the user will have to select the moving parts of the valve for the valve geometry by clicking on 'Start Selection' button under the Rotating/Lifting Parts section.
Add body to moving bodies : Move cursor on to the object user want to set as moving, Then right click and select "Add body to moving bodies" from options. Repeat the same for all the moving bodies in your geometry. You can also add multiple bodies simultaneously by pressing the 'CTRL' button on the keyboard while selecting the bodies.
List of Selected bodies : This box will show a list of selected objects and user can hide or delete selected objects from options given.
End Selection : Once all the moving bodies are selected, click on 'End Selection' button for confirmation that all moving parts have been added.

Selection of axis motion ( Rotation/ Lift)

Select Axis : Click "Axis of Rotation/Lift" on the left Navigation Panel. This will open a sub-stage menu in Axis selection for moving parts. This method is the same for rotation and lift valve.
Select a method : There are two methods available for selecting an axis for the control valve. Choose one from the drop-down menu.

  1. Axis using cylinder: This method involves selecting an axis of rotation/lift for the moving bodies by selecting a cylindrical surface through which the axis will pass.
    1. Start by clicking on the 'Axis of Rotation', choose 'Axis using cylinder' from the drop-down menu.
    2. Click on 'Select cylindrical surface'. Select the cylindrical surface on the geometry through which the axis will pass. Refer 3. A dotted axis will appear passing through the center of the cylinder you selected.
  2. Axis using two points: This method will be used if the user could not find any concentric cylindrical surface through which the axis passes. Here you can select two surfaces such that the axis will pass through their centers.
    1. Start by choosing 'Axis using two points' in the drop-down menu.
    2. Click on 'Select start point surface(s)', select the first surface on the geometry through which the axis will pass. Click on 'Accept'.
    3. Click on 'Select end point surface(s)', select the second surface on the geometry through which the axis will pass. Click on 'Accept'.
    4. A dotted axis will appear between the two centers of the surfaces selected.

Valve Opening Conditions:

A complete performance curve for a control valve contains valve coefficients from fully closed to a fully open condition. The accuracy of the performance curve depends on the number of opening conditions considered for performance evaluation. Typically, 5 to 10 number of opening conditions are considered good for accurate representation of valve performance curve. Control Valve Performer app provides the number of conditions anywhere between 2 to 16. To avoid simulation failure, it is recommended to provide opening conditions anywhere between 20 % to 100% opening of a valve.

In case of rotation motion type, provide minimum and maximum opening angle. Minimum angle should be more than or equal to 20° and the maximum angle should be less than or equal to 90°.

In case of lift motion type, provide start position and end position of valve opening condition. As the total lift travel of the valve is not known, you should take care to provide the start position such that the minimum opening is more than or equal to 20 % of the total opening. It is also necessary to provide end position such that the maximum opening is less than or equal to 100%.

Once minimum and maximum rotation/lift conditions are provided, enter the total number of opening conditions. The opening conditions will be equally divided between the minimum and maximum opening value. For example, if the minimum angle is 20°, maximum angle is 90° and the number of conditions is 8, the opening angle for simulation will be 20°, 30°, 40°, 50°, 60°, 70°, 80°, and 90°. Selection procedure for valve opening condition is given below.

Valve Opening Conditions : Click "Valve Opening Conditions" from stage Moving Parts Settings.
Start angle and end angle : User need to give minimum valve opening condition here (for Rotating valve it should be in degrees of angular rotation and for Lift valve it should be in millimeter of displacement.)
Preview and Apply settings : You can preview the valve opening conditions to confirm the opening settings. Make sure that the valve rotates or lifts in the correct direction. If the rotation or lift is in opposite direction, you can use "Reverse" button in-front of Rotation / Lift Axis to reverse the opening direction.
Save opening settings : Click "Apply" button to save opening conditions. These conditions will then be saved with valve performance study.

Fluid Volume Extraction

Providing fluid volume is necessary for any CFD analysis. Fluid volume defines the regions in which flow equations are solved. In traditional CFD approach and software, extracting fluid volume is considered as one of the complex and time-consuming processes. It involves cleaning the geometry features and making geometry "water-tight".

simulationHub comes with a unique fluid volume extraction algorithm. To extract fluid volume, you just need to provide a point (referred as a fluid point) anywhere within fluid domain / domain of interest. The algorithm intelligently closes the gaps, creates water-tight geometry and extracts fluid volume.

Fluid Volume Extraction : Click on "Extract Fluid Volume" in the main fluid volume stage. This will direct you to sub-stage menu for fluid volume extraction.
Provide fluid point : You need to provide two points to define the fluid point. You can left click on any surface of the geometry to define the point. The center point of two selected points will be considered as a fluid point. Use other mouse buttons to transform the model and give correct point location.

2 After selection of a fluid point, make sure that the fluid point is inside the geometry/region where CFD simulation will be carried out. In case if you have provided a wrong fluid point, click on "Select Input Points" and provide correct location.

Extract fluid volume : Click on "Extract Fluid Volume" button to open run simulation dialog box. 4 The dialog box will give information about your available credits and simulation credits required for fluid volume extraction.

Define Valve Connections

To do CFD simulation at each opening position, flow direction needs to be specified. Valve connection settings allow you to specify the inlet and outlet side of the connecting pipe which helps in defining the flow direction.

Following is procedure define inlet and outlet connections:

Connection Settings : Click "Define Valve Connections" from stage 'Valve Connections', this will open sub-stage menu in Valve connections.
Select Inlet and Outlet :
1. Click on 2 Select Inlet button. Select the inlet surface of the fluid by clicking on that surface 3 on the geometry.
2. Click on 4 Select Outlet button. Select the outlet surface of the fluid by clicking on that surface 5 on the geometry.

Colour codes are given to identify connections as following -

Indicates Inlet Connection

Indicates Outlet Connection

Save Connection settings : Click "Apply Connections" button to save the applied valve connection settings.

The flow will now be simulated in the direction defined based on the inlet and the outlet connections.

Run Simulation

Control Valve Performer app uses cloud computing for all calculations. The process will include meshing, solving the numerical equations and finally post-processing of the results.To submit the simulation run and check status, do following:

Run simulation : Click "Simulation Run and status". This opens a sub-stage for submitting the simulation and checking the status of the simulation.
Submit Simulation : To submit the simulation click on "Submit Simulation". The Control Valve Performer app will now begin with the process to generate the mesh, run the simulation and perform post-processing on the results.

Note: If in case you make changes in the Valve Connections stage on a already completed simulation, a pop-up message will appear 3 informing you about the number of credits required for simulating the valve geometry with the change in valve connections.

Check Status : In the left Navigation Panel, the status of the simulation will be shown under the 'Simulation Status' section. The time required for simulation depends on the size of geometry and number of opening conditions submitted. Simulation of each opening conditions has different stages. Live feed of each stage statues will be shown for all opening conditions 4. Once the simulation is completed, progress bar for each opening condition will be marked with blue color and overall status will be marked "Completed". The user will be notified about the completion of the simulation on his registered email id.
Terminate : In case you wish to stop your simulation in between, you can click on the "Terminate" button. The simulation will stop immediately. You can make the necessary changes once the simulation is terminated.

Control valve performance results

Performance Summary

Once the simulation is completed, the number of performance results are available within Fusion 360. The first result is performance summary. To access the performance summary, click Summary Result 1 under RESULTS drop-down. This will open "RESULTS - SUMMARY" popup.

The top section 2 of result summary popup contains simulation name, valve type, motion type and number opening conditions. The performance summary section 3 contains control valve coefficient values like CV, KV and pressure drop at all opening conditions provided during valve opening settings. In case of an ON-OFF valve, these values are given for fully open condition.

You can export these results in comma-separated values or CSV format. You can open this file in many software like Microsoft Excel, OpenOffice or Google Docs to create your custom graph. To export CSV file, click "EXPORT" button 2. This will open a "Download Result" dialog. Select the location to save the file, provide a name and click "Save" 5 to save the CSV file containing all performance data.

Performance curves

Performance curve results are available for rotating and lift control valves. These results include a CV, KV and pressure drop curve. To access the performance curves, select the desired curve 1 (for example CV Curve) under RESULTS drop-down. This will open selected result pop-up.

The performance curve is a plot of opening configuration on X-axis and performance parameter value on Y-axis. You can export these plots in an image format. Click on "EXPORT" button 2 on the result pop-up. This will open an export dialog. You can export images of different resolution starting from regular to a 5K image. Select desired image resolution from the drop-down and click EXPORT 3 button. This will open a "Download Result" dialog. Select the location to save the file, provide a name and click "Save" 5 to save PNG image of the performance plot.

3D results

To do design modification and get desired performance curve, it is necessary to go deep into the flow behavior inside the control valve. Control Valve Performer app generate required CFD data to understand the flow physics. You can access these 3D CFD results using 3D Results option available under "Result" menu. (NOTE : Clicking on 3D Results opens Control Valve Performer app in a web browser. Refer to "Understanding results" section to know more details about understanding all CFD results).

Flow lines

Flow lines depict the path followed by fluid particles from an inlet to outlet of a valve. This is similar to the flow visualization technique where some colored particles are injected from an inlet and its trace in the flow domain is marked. Along with that path, the flow lines also display the magnitude of velocity and pressure of each particle along its path. This is useful information to identify flow separation and recirculation zones in a valve.

When you click on 3D Results option under "Results" drop-down in Fusion 360, it will by default open flow lines results. You can also access the flow lines by clicking Flow Lines in result main stage or by using "Results quick access menu" provided at the top center of the 3D viewer. (NOTE: If you have not gone through the 3D results user interface, it is strongly advised to refer to "User interface" section and get familiar with the interface of 3D results.)

Flow lines are loaded with the default configuration of an opening condition, variable, colors, and opacity. Use following settings to modify the display of flow lines:

Variable : Select the variable to be used to color flow lines. You can select either velocity or pressure as a variable. You can also change the number of color bands to be used to create the color variation. By default, variable variation is shown using 16 colors. Anywhere between 2 to 100 colors can be used as a color variation. Change the variable, change the number of colors and click "Apply" button. This will apply selected change on the colors of flow lines.
Model opacity : To get a better view of flow lines, the model is made opaque while loading flow lines. You can change opacity settings using slider provided in Model Opacity section with 0 indicating fully transparent and 1 indicating fully visible. In case if you have a multi-part model, you can change the opacity of one / more parts. Check the "Selected Only" option, select single / multiple parts and drag the opacity slider. Drag and release the slider at desired opacity to change the opacity of model. Click "Reset" button make model fully visible.
Color legend : CFD analysis generates a numerical data as a result. Understanding large quantity of numbers is very difficult. To give a better understanding of results and to create a visual representation of numbers, a color coding method is used. The range of minimum to the maximum value is first divided into the number of groups (In simulationHub, we divide them 2 to 100 groups). Each group is then assigned a unique color. Any number then gets a color based on which group it belongs to. In simulationHub, we use a color variation between blue to red where blue indicates a minimum value and red indicates a maximum value. The color legend shows the minimum and maximum value, variable displayed and color for each group.
Take a snap : Click (Set simulation image) button located in a menu at mid-bottom of the viewer. This will open a "Take a Snap" dialog with image preview. "Set as simulation feature image" option will make the snap as simulation feature image display on dashboard and simulation details page. "Add in simulation repository" option is used to keep the snap in simulation data for future reference.
Change valve opening : For a lift and rotating type control valve, the number of opening conditions is used to get the complete performance curve. The number of opening conditions depends on the performance curve accuracy required and can be selected anywhere between 2 to 8 while doing opening settings.

A performance curve is a single curve generated considering all opening conditions. Other CFD results like flow lines, flow lines with vectors and contour plots are available for each opening condition. You can view and analyze these results to see flow features for each opening angle and take a decision on design modifications to get desired performance curve.

By default, flow line results are displayed for the minimum opening condition. To see flow lines for other valve openings, click on "Select condition" drop-down, select a desired opening condition from the list and click "Apply" 6 button. his will display the flow lines for the selected opening condition.

Flow lines with vectors

The flow lines can be animated using arrows. The direction of an arrow indicated flow direction and speed of arrows is based on velocity magnitude. This helps to understand the relative velocity difference at the different location in the flow region.

To access the flow lines, click Flow Lines with Vectors in result main stage. You can also access this using "Results quick access menu" provided at the top center of the 3D viewer.

Flow lines with vectors are loaded with the default configuration of an opening condition, variable, colors, opacity and arrow speed. Use following settings to modify the display.

Usage of 1Variable, 2Model opacity, 3Color legend, 4Take a snap and 5Opening conditionis same as that of flow lines results.

Settings : Flow line arrow animation speed can be changed using speed slider located in the settings section. Speed can be adjusted anywhere between 1 to 100, where 1 results into slowest and 100 results into fastest animation speed. Drag and release the slider at the desired speed to change the speed of arrow animation.

Surface pressure

Surface pressure is pressure contours plotted on the surfaces in contact with the fluid. This information is useful to identify the regions of low-pressure zones and the possible locations of flow recirculation.

To access the surface pressure, click Surface Pressure in result main stage. You can also access this using "Results quick access menu" provided at the top center of the 3D viewer.

Surface pressure is loaded with the default configuration of an opening condition, variable, model opacity, and surface visibility. Use following settings to modify the display.

Variable : "Color By" drop-down is deactivated as surfaces pressure plots are generated only with pressure values. By default, the 16 number of colors are used to display surface pressure plot. To change the number of colors, drag and release the color slider at a desired value and click "Apply" button.
Model opacity : To get a better view of surface pressure plots, all the model parts are made hidden. To view the geometry along with surface pressure, right-click anywhere in the graphics window and select "Show all objects". You will see now see the geometry along with surface pressure. You can then adjust the opacity of geometry using Opacity slider in "Model Opacity" section.
Surface visibility : To get a view of pressure on internal surfaces, sometimes it is needed to hide pressure plot of few surfaces. You can use options in "Surface Visibility" section to hide surface. Click on "Select Surface" button, select the surfaces you want to hide, click on "End Selection" button to end the surface selection process. All the selected surfaces are shown in "Selected Surface" table. Use / icon to hide/show the individual surface. Click icon to remove surface from the selection list. You can use / icons in the table header to hide/show all surfaces and icon to remove all the surfaces from the selection list.

Usage of 3 Color legend, 4 Take a snap, and 5 Selection condition is same as that of flow lines results.

Contour plots

The contour plot is a pictorial representation of flow property variation in the fluid domain. The location of flow separation, high velocity, and low-pressure regions are few examples of insights that can be gained through CFD results visualization. Contour plots display the velocity or pressure variation about any 2D cut section of the geometry.

To access the contour plot, click Contour Plots in result main stage. You can also access this using "Results quick access menu" provided at the top center of the 3D viewer.

Contour plots loads with default settings for an opening condition, cut plane location, variable and model opacity. Use following settings to modify the contour plot.

Usage of 1Variable, 2Model opacity, 3Color legend, 4Take a snap, and 5Opening condition is same as that of flow lines results.

Cut plane : Contour plots can be shown in X, Y, or Z direction. To change the cut section direction and location, sliders are provided in "Cut Plane" section. You can change the plane location from 1 to 100 where 50 represents the middle cut section.

By default, Z = 50 cut section is displayed. The displayed cut section value and direction is shown at the bottom. To change the cut section, drag and release the slider at the desired location.

Settings : When the cut section is selected for contour plot, the geometry is also sectioned at the selected location. This shows only one side of the geometry to make contour plot visible. If you want to get the full display of geometry, you can deactivate "Section Geometry" option in the settings section.

Performance data

Control Valve Performer app generates various valve performance data including valve coefficients and pressure drop at various opening conditions. To access the performance data, click Performance Data in result main stage. You can also access the performance data using "Results quick access menu" provided at the top center of the 3D viewer.

All the performance data is shown in left panel.

Result summary : The first section contains the result summary. This summary includes CV, KV coefficient values and pressure drop at various valve opening conditions. You can export these results in comma-separated values or CSV format. You can open this file in many software like Microsoft Excel, OpenOffice or Google Docs to create your custom graph. To export CSV file, click "Export Result Summary" button 2. This will download the result summary CSV file.
CV coefficient curve : The second section shows CV coefficient curve which is a plot of opening configuration on X-axis and CV coefficient value on Y-axis. To see the large view of the plot and export the curve, click on 4 View & Export button. This will open a CV Curve dialog. Mouse over on any data point will show exact value of opening condition and valve coefficient.
Export CV coefficient curve : To export the curve, click on "Export" button on "CV Curve" dialog. This will open an "Export" dialog. The coefficient curve can be exported in a CSV file format or as a PNG image. You can export images of different resolution starting from regular to a 5K resolution. Select a desired export option 6 and click on Export button 7. This will download the result in selected file format.

KV coefficient 8 and pressure drop 9 curves are presented in the left panel. Use the same procedure as above to view and export these results.

Control valve performance report

Control Valve Performer app comes with a unique report generation feature. We have extracted required and critical information about analysis to compile a ready-to-use PDF report. The report begins with an executive summary including a quick view of performance curves. The following section contains details like simulation name, objective and view of CAD model of a valve. The CFD section gives you information overall methodology used, fluid properties and assumptions made during CFD analysis. The result section starts with quantitative results including CV, KV coefficients at all opening conditions. It also includes performance plots. The qualitative results include velocity and pressure contour plots at mid-section for all opening conditions.

To access the CFD analysis report, click Report in result main stage. This will open a PDF report window. You can download the report using download button provided in the top right menu.

NOTE: Once the simulation is completed, a PDF document of the report is also sent as an attached to simulation completion email.


Once you log into the simulationHub account, you can go to your dashboard using a link in the top navigation bar. The dashboard provides an at-a-glance view of all your simulations. The dashboard contains main components like top navbar, side navigation, simulation quick-view tile and other important information about your account and subscription.

Simulation quick-view tile on the dashboard has following components:

Simulation image : The simulation image on dashboard tile gives a quick visual view of simulation. This image is automatically updated based on the recently opened / completed simulation stage. You can also set this image using "Set simulation image" button available in 3D viewer. Click on the simulation image will open simulation in 3D viewer.
Simulation details : Simulation details section in quick-view tile contains information like simulation name, simulation app, and last opened / edit information. By default, all the simulations are arranged in descending order of its last access time.
Simulation status : Simulation status is the dynamic content of quick-view tile. The progress percentage, status and progress bar will change based on the status of the simulation. Appropriate color coding is used to give the visual representation of simulation status.
Quick links : Quick links are provided to open details page or 3D viewer for simulation.

Simulation details

Simulation details page contains all the information either entered by you or generated during the simulation process. We have written app specific algorithms to extract all the simulation information and presented in a report ready format.

Following are the major components of simulation details page.

Name and details : Simulation name and details are provided at the top
Simulation image : The image slider contains all the simulation images. These images are automatically updated based on the recently opened / completed simulation stage. You can also set this image using "Set simulation image" button available in 3D viewer.
Simulation details : The simulation details section contains all input information including name, description, valve type, opening conditions etc. The simulation results information is arranged in different sections. It first includes the valve performance summary, CV, KV and pressure drop performance plots. The CFD results are presented in the different section and include image sliders for specific output like flow lines, flow lines with vectors, contour plots etc. You can collapse the view of each section using the arrow provided at the top right corner of each section.
Simulation actions : Simulation action section provides buttons to perform different actions on the simulation. You can open 3D simulation, copy, edit or delete the simulation using these buttons.
Quick glance : Quick glance section contains some important information about simulation. It includes simulation details, overall simulation status, simulation images and important notifications about the app.
Left navigation toggle button : This button toggles the left navigation menu. Left navigation menu contains simulation filter (recently opened / filter by app / simulation gallery), help and support section and account section. You can access app specific help or raise a support ticket for your simulation.
Profile and help : In profile, you can control your profile and account settings, or use the help menu to continue your learning or get help in troubleshooting. This menu also contains a quick link to the dashboard. Use full-screen icon if you wish to use the app in full-screen mode.

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Mobile device modifications

A profile and help menu 7 is modified for mobile and tablet devices. You will see raise ticket and sign out buttons in the profile and help menu.

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simulationHub App Get Started - Blogs


Read about an application of Control Valve Performer for valve design. Learn about latest app features, tips, tutorials. Find out the views and opinions on design trends in control valve industry.

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simulationHub App Get Started - Case Studies

Case Studies

Control Valve Performer app is used to design, develop and optimize control valve performance. Read the real-life industrial case studies about how the app is used to improve control valve performance.

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