ansys fluent in workbench custom-input-parameter · • use define_output_parameter() udf macro •...

© 2012 ANSYS, Inc. May 20, 2013 1 Release 14.5

14.5 Release

ANSYS Fluent in Workbench Custom-Input-Parameter

Maciej Ginalski


Simulation to be performed

• The task is to set the parametric study involving different set of pre-defined fluid materials. The example utilises a new Custom-Input-Parameter option (Beta) in ANSYS Fluent v14.5 solver.

• This example will be making use of the prepared Fluent case. The case was set with seven different materials representing air (air1,air2, … , air7) and every air material is utilising a different density model available in the Fluent solver.

• The simulation is being performed to determine:

– pressure drop and average gas density for a number of different cases (every case will utilise different density formulation)

Introduction Model Setup Solving Post-Processing Summary


• Start a new workbench session

• Save the project as: ‘CIP-Material’

• Locate the ‘user_files’ folder associated with this project and copy files provided with this tutorial into this folder

Starting a new project in Workbench



• Open any Text Editor and copy & paste the following function definition

• Save the file as: ‘CUI-Material.scm’ in the ‘user_files’ directory of you workbench project

(define (Material value)

(format "### Changing Material to: air~a ...\n" value)

(ti-menu-load-string (format #f "/define/boundary-conditions/fluid fluid yes air~a

no no no no 0 no 0 no 0 no 0 no 0 no 1 no no no no" value))

(format "\n### Material changed to air~a successfully!" value)

)

Define Scheme Function


Fluent TUI command

Custom Input Variable Scheme function name


• Drag a Fluent component system onto the project schematics • Right-click on ‘Setup’, and select

‘Register Startup Scheme File’, and Browse

• Browse to and select the file “CUI-Material.scm” located in

project’s ‘user_file’ folder

Select open to close the panel.

Import Fluent Case File



Register Pre-prepared Scheme File

• Right-click on ‘Setup’, and select ‘Import Fluent Case’, and Browse

• Browse to and select the file “CUI-Material.cas” located in

project’s ‘user_file’ folder • In the Fluent Launcher panel select

‘Double Precision’ option and press ‘OK’

If Cancel option is selected WB will associate

selected case file with Setup cell without opening Fluent.



• In Fluent Text User Interface (TUI) type the following command: (material 1) Including the brackets If the Scheme file was registered successfully Fluent will report the following message: ‘### Material changed to air1 successfully’


Verify registration of the scheme file


Enable Beta options in Fluent

• Type the following TUI command to enable Beta options in Fluent. /define/beta /yes ok



Define Custom-Input-Parameter

• In Text Console type the following command: /define/parameters/custom-input-parameters create

• Name of parameter: material-id material-id is the parameter name that will appear in WB and parameters panel in Fluent

• Material-id value [0]: 1 material-id value is the initial value of the parameter

• Name of custom-input-variable: id id is the name of the variable passing information between WB and Fluent

• Enter the name of apply-function []: material material is the name of the scheme function defined within the scheme file



Define Output Parameters

• Open the Parameters Panel Select from menu: Define => Parameters

• Under ‘Output Parameters’ select Create > ‘Surface Integrals…’ to open ‘Surface Integrals’ panel

• Under ‘Report Type’ select ‘Area-Weighted Average’

• Under Field Variable select ‘Pressure’ and ‘Static Pressure’

• Under ‘Surfaces’ select ‘inlet’ and ‘outlet’ zones

• Select ‘Save Output Parameter’ to open ‘Save Output Parameter’ panel

• Specify name of the new parameter: ‘DelP’ and press ’OK’

• Close the ‘Surface Integrals’ panel



Define Output Parameters

• Define DenAvg output parameter in a similar way to DelP DenAvg parameter will monitor the value of average density at the outlet – In the ‘Surface Integrals’ panel: • Keep ‘Report Type’ as ‘Area-

Weighted Average’ • Under Field Variable select

‘Density’ and ‘Density’ • Under ‘Surfaces’ select only ‘outlet’

zone • Select ‘Save Output Parameter’ and

specify name of the new parameter: DenAvg and press OK

• Close the ‘Surface Integrals’ panel • Close the ‘Parameters’ panel



• Close Fluent

• Save the workbench session

• Right-click on ‘Solution’, and select ‘Update’

Wait for approx 1 minute whilst the first Fluent model is computed.

Run the Simulation – Current (DP0)



Run the Parametric Study

• Right-click on ‘Parameters Set’ bar, and select ‘Edit’ to access parameters manager

• Add six new Design Points (DPs) in the ‘Table of Design Points’ by specifying ‘material-id’ value as demonstrated on the picture

• Select ‘Update All Design Points’ This will take about 5 minutes to compute. • Observe the effect of varying the

material parameters has made to the output parameters.

Introduction Model Setup Solving Parametric Study Summary


Wrap-up

This workshop has shown the basic steps required to define and utilise Custom-Input-Parameter enhancements introduced as the Beta feature in Fluent at R14.5 The main motivation behind this functionality is to allow users to avoid the limitations of standard parameters defined in Fluent GUI. Every model feature, and every solver setting can now be converted to a parameter which will be further exposed within the workbench environment. In v15.0 will bring more new features and support in GUI.



Further work • There are many ways the simulation in this tutorial could be extended

• Use more elaborate combinations of material settings • User can prepare multiple variations of material properties involving tabular data or

extrapolated functions.

• Multiple Custom-Input-Parameters • User can define multiple Apply Functions and store these functions in the registered

scheme file.

• More elaborate TUI commands • The single custom-input-parameter can be employed to control multiple settings at once

(i.e. once parameter can be used to control number of boundary conditions)

• Use DEFINE_OUTPUT_PARAMETER() UDF macro • Extended by the potential of DEFINE_OUTPUT_PARAMETER UDF macro Custom-Input-

Parameters provide extensive capability of controlling and reporting every aspect of Fluent simulation with a set of pre-defined parameters.


ansys fluent in workbench custom-input-parameter · • use define_output_parameter() udf macro •...

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