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ANSYS Fluent UDF Manual.pdf
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ANSYS Fluent Customization Manual
Release 16.2ANSYS, Inc.
July 2015Southpointe
2600 ANSYS Drive
Canonsburg, PA 15317
ANSYS, Inc. is
certified to ISO
9001:2008.
ansysinfo@ansys.com
http://www.ansys.com
(T) 724-746-3304
(F) 724-514-9494
Copyright and Trademark Information
© 2015 SAS IP, Inc. All rights reserved. Unauthorized use, distribution or duplication is prohibited.
ANSYS, ANSYS Workbench, Ansoft, AUTODYN, EKM, Engineering Knowledge Manager, CFX, FLUENT, HFSS, AIM
and any and all ANSYS, Inc. brand, product, service and feature names, logos and slogans are registered trademarks
or trademarks of ANSYS, Inc. or its subsidiaries in the United States or other countries. ICEM CFD is a trademark
used by ANSYS, Inc. under license. CFX is a trademark of Sony Corporation in Japan. All other brand, product,
service and feature names or trademarks are the property of their respective owners.
Disclaimer Notice
THIS ANSYS SOFTWARE PRODUCT AND PROGRAM DOCUMENTATION INCLUDE TRADE SECRETS AND ARE CONFID-
ENTIAL AND PROPRIETARY PRODUCTS OF ANSYS, INC., ITS SUBSIDIARIES, OR LICENSORS. The software products
and documentation are furnished by ANSYS, Inc., its subsidiaries, or affiliates under a software license agreement
that contains provisions concerning non-disclosure, copying, length and nature of use, compliance with exporting
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For U.S. Government users, except as specifically granted by the ANSYS, Inc. software license agreement, the use,
duplication, or disclosure by the United States Government is subject to restrictions stated in the ANSYS, Inc.
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Published in the U.S.A.
Table of Contents
Using This Manual ..................................................................................................................................... xxv
1.The Contents of This Manual ............................................................................................................. xxv
2.The Contents of the Fluent Manuals ................................................................................................ xxvii
3. Typographical Conventions ........................................................................................................... xxviii
4. Mathematical Conventions ............................................................................................................... xxx
5. Technical Support ........................................................................................................................... xxxi
I. Creating and Using User Defined Functions ............................................................................................ 1
1. Overview of User-Defined Functions (UDFs) .................................................................................... 3
1.1. What is a User-Defined Function? ................................................................................................ 3
1.2. Limitations ................................................................................................................................. 4
1.3. Defining Your UDF Using DEFINE Macros ................................................................................... 4
1.3.1. Including the udf.h Header File in Your Source File ........................................................... 5
1.4. Interpreting and Compiling UDFs ................................................................................................ 6
1.4.1. Compiled UDFs .................................................................................................................. 6
1.4.2. Interpreted UDFs ............................................................................................................... 6
1.4.3. Differences Between Interpreted and Compiled UDFs ......................................................... 6
1.5. Hooking UDFs to Your ANSYS Fluent Model ................................................................................. 7
1.6. Mesh Terminology ...................................................................................................................... 8
1.7. Data Types in ANSYS Fluent ......................................................................................................... 9
1.8. UDF Calling Sequence in the Solution Process ........................................................................... 10
1.8.1. Pressure-Based Segregated Solver .................................................................................... 11
1.8.2. Pressure-Based Coupled Solver ......................................................................................... 12
1.8.3. Density-Based Solver ........................................................................................................ 13
1.9. Special Considerations for Multiphase UDFs .............................................................................. 14
1.9.1. Multiphase-specific Data Types ......................................................................................... 14
2. DEFINE Macros ............................................................................................................................... 17
2.1. Introduction ............................................................................................................................. 17
2.2. General Purpose DEFINE Macros ............................................................................................. 17
2.2.1. DEFINE_ADJUST ........................................................................................................... 18
2.2.1.1. Description ............................................................................................................. 18
2.2.1.2. Usage ...................................................................................................................... 19
2.2.1.3. Example 1 ............................................................................................................... 19
2.2.1.4. Example 2 ............................................................................................................... 20
2.2.1.5. Hooking an Adjust UDF to ANSYS Fluent .................................................................. 20
2.2.2. DEFINE_DELTAT ........................................................................................................... 20
2.2.2.1. Description ............................................................................................................. 20
2.2.2.2. Usage ...................................................................................................................... 20
2.2.2.3. Example .................................................................................................................. 21
2.2.2.4. Hooking an Adaptive Time Step UDF to ANSYS Fluent .............................................. 21
2.2.3. DEFINE_EXECUTE_AT_END .......................................................................................... 21
2.2.3.1. Description ............................................................................................................. 21
2.2.3.2. Usage ...................................................................................................................... 22
2.2.3.3. Example .................................................................................................................. 22
2.2.3.4. Hooking an Execute-at-End UDF to ANSYS Fluent ..................................................... 22
2.2.4. DEFINE_EXECUTE_AT_EXIT ....................................................................................... 23
2.2.4.1. Description ............................................................................................................. 23
2.2.4.2. Usage ...................................................................................................................... 23
2.2.4.3. Hooking an Execute-at-Exit UDF to ANSYS Fluent ..................................................... 23
2.2.5. DEFINE_EXECUTE_FROM_GUI ..................................................................................... 23
2.2.5.1. Description ............................................................................................................. 23
iii
Release 16.2 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
2.2.5.2. Usage ...................................................................................................................... 23
2.2.5.3. Example .................................................................................................................. 24
2.2.5.4. Hooking an Execute From GUI UDF to ANSYS Fluent ................................................. 25
2.2.6. DEFINE_EXECUTE_ON_LOADING ................................................................................. 25
2.2.6.1. Description ............................................................................................................. 25
2.2.6.2. Usage ...................................................................................................................... 25
2.2.6.3. Example 1 ............................................................................................................... 25
2.2.6.4. Example 2 ............................................................................................................... 26
2.2.6.5. Hooking an Execute On Loading UDF to ANSYS Fluent ............................................. 27
2.2.7. DEFINE_EXECUTE_AFTER_CASE/DATA ...................................................................... 27
2.2.7.1. Description ............................................................................................................. 27
2.2.7.2. Usage ...................................................................................................................... 27
2.2.7.3. Example .................................................................................................................. 28
2.2.7.4. Hooking an Execute After Reading Case and Data File UDF to ANSYS Fluent .............. 28
2.2.8. DEFINE_INIT ................................................................................................................ 28
2.2.8.1. Description ............................................................................................................. 28
2.2.8.2. Usage ...................................................................................................................... 28
2.2.8.3. Example .................................................................................................................. 29
2.2.8.4. Hooking an Initialization UDF to ANSYS Fluent ......................................................... 29
2.2.9. DEFINE_ON_DEMAND ..................................................................................................... 29
2.2.9.1. Description ............................................................................................................. 29
2.2.9.2. Usage ...................................................................................................................... 30
2.2.9.3. Example .................................................................................................................. 30
2.2.9.4. Hooking an On-Demand UDF to ANSYS Fluent ......................................................... 31
2.2.10. DEFINE_OUTPUT_PARAMETER ................................................................................... 31
2.2.10.1. Description ............................................................................................................ 31
2.2.10.2. Usage .................................................................................................................... 31
2.2.10.3. Example ................................................................................................................ 32
2.2.10.4. Hooking an Output Parameter UDF to ANSYS Fluent .............................................. 32
2.2.11. DEFINE_RW_FILE ....................................................................................................... 33
2.2.11.1. Description ............................................................................................................ 33
2.2.11.2. Usage .................................................................................................................... 33
2.2.11.3. Example ................................................................................................................ 33
2.2.11.4. Hooking a Read/Write Case or Data File UDF to ANSYS Fluent ................................. 34
2.2.12. DEFINE_RW_HDF_FILE .............................................................................................. 34
2.2.12.1. Description ............................................................................................................ 34
2.2.12.2. Usage .................................................................................................................... 34
2.2.12.3. Helper Functions ................................................................................................... 34
2.2.12.4. Examples ............................................................................................................... 39
2.2.12.5. Hooking a Read/Write HDF Case or Data File UDF to ANSYS Fluent .......................... 40
2.3. Model-Specific DEFINE Macros ................................................................................................ 40
2.3.1. DEFINE_ANISOTROPIC_CONDUCTIVITY .................................................................... 47
2.3.1.1. Description ............................................................................................................. 47
2.3.1.2. Usage ...................................................................................................................... 47
2.3.1.3. Example .................................................................................................................. 47
2.3.1.4. Hooking an Anisotropic Conductivity UDF to ANSYS Fluent ...................................... 48
2.3.2. DEFINE_CHEM_STEP ..................................................................................................... 49
2.3.2.1. Description ............................................................................................................. 49
2.3.2.2. Usage ...................................................................................................................... 49
2.3.2.3. Example .................................................................................................................. 50
2.3.2.4. Hooking a Chemistry Step UDF to ANSYS Fluent ....................................................... 50
2.3.3. DEFINE_CPHI ................................................................................................................ 50
Release 16.2 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.iv
Customization Manual
2.3.3.1. Description ............................................................................................................. 50
2.3.3.2. Usage ...................................................................................................................... 50
2.3.3.3. Hooking a Mixing Constant UDF to ANSYS Fluent ..................................................... 51
2.3.4. DEFINE_DIFFUSIVITY ................................................................................................ 51
2.3.4.1. Description ............................................................................................................. 51
2.3.4.2. Usage ...................................................................................................................... 51
2.3.4.3. Example .................................................................................................................. 51
2.3.4.4. Hooking a Diffusivity UDF to ANSYS Fluent .............................................................. 52
2.3.5. DEFINE_DOM_DIFFUSE_REFLECTIVITY .................................................................... 52
2.3.5.1. Description ............................................................................................................. 52
2.3.5.2. Usage ...................................................................................................................... 52
2.3.5.3. Example .................................................................................................................. 53
2.3.5.4. Hooking a Discrete Ordinates Model (DOM) Diffuse Reflectivity UDF to ANSYS Flu-
ent ..................................................................................................................................... 53
2.3.6. DEFINE_DOM_SOURCE .................................................................................................. 54
2.3.6.1. Description ............................................................................................................. 54
2.3.6.2. Usage ...................................................................................................................... 54
2.3.6.3. Example .................................................................................................................. 54
2.3.6.4. Hooking a DOM Source UDF to ANSYS Fluent ........................................................... 55
2.3.7. DEFINE_DOM_SPECULAR_REFLECTIVITY ................................................................. 55
2.3.7.1. Description ............................................................................................................. 55
2.3.7.2. Usage ...................................................................................................................... 55
2.3.7.3. Example .................................................................................................................. 56
2.3.7.4. Hooking a Discrete Ordinates Model (DOM) Specular Reflectivity UDF to ANSYS Flu-
ent ..................................................................................................................................... 56
2.3.8. DEFINE_ECFM_SOURCE ................................................................................................ 57
2.3.8.1. Description ............................................................................................................. 57
2.3.8.2. Usage ...................................................................................................................... 57
2.3.8.3. Example .................................................................................................................. 57
2.3.8.4. Hooking an ECFM Flame Density Area Source UDF to ANSYS Fluent .......................... 58
2.3.9. DEFINE_ECFM_SPARK_SOURCE ................................................................................... 58
2.3.9.1. Description ............................................................................................................. 58
2.3.9.2. Usage ...................................................................................................................... 58
2.3.9.3. Example .................................................................................................................. 59
2.3.9.4. Hooking an ECFM Spark Source UDF to ANSYS Fluent ............................................... 59
2.3.10. DEFINE_EMISSIVITY_WEIGHTING_FACTOR ........................................................... 59
2.3.10.1. Description ............................................................................................................ 59
2.3.10.2. Usage .................................................................................................................... 59
2.3.10.3. Example ................................................................................................................ 60
2.3.10.4. Hooking an Emissivity Weighting Factor UDF to ANSYS Fluent ................................ 60
2.3.11. DEFINE_ZONE_MOTION .............................................................................................. 60
2.3.11.1. Description ............................................................................................................ 60
2.3.11.2. Usage .................................................................................................................... 60
2.3.11.3. Example ................................................................................................................ 61
2.3.11.4. Hooking a Frame Motion UDF to ANSYS Fluent ....................................................... 62
2.3.12. DEFINE_GRAY_BAND_ABS_COEFF ............................................................................. 62
2.3.12.1. Description ............................................................................................................ 62
2.3.12.2. Usage .................................................................................................................... 62
2.3.12.3. Example ................................................................................................................ 62
2.3.12.4. Hooking a Gray Band Coefficient UDF to ANSYS Fluent ........................................... 63
2.3.13. DEFINE_HEAT_FLUX ................................................................................................... 63
2.3.13.1. Description ............................................................................................................ 63
v
Release 16.2 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
Customization Manual
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