Fluent UDF Manual - PMT

1 ansys Fluent UDF ManualRelease , 2013 Southpointe275 Technology DriveCanonsburg, PA 15317 ansys , Inc. iscertified to T ) 724-746-3304(F) 724-514-9494 Copyright and Trademark Information 2013 SAS IP, Inc. All rights reserved. Unauthorized use, distribution or duplication is , ansys Workbench, Ansoft, AUTODYN, EKM, Engineering Knowledge Manager, CFX, Fluent , HFSS and anyand all ansys , Inc. brand, product, service and feature names, logos and slogans are registered trademarks ortrademarks of ansys , Inc. or its subsidiaries in the United States or other countries.

2 ICEM CFD is a trademark usedby ansys , Inc. under license. CFX is a trademark of Sony Corporation in Japan. All other brand, product, serviceand feature names or trademarks are the property of their respective NoticeTHIS ansys SOFTWARE PRODUCT AND PROGRAM DOCUMENTATION INCLUDE TRADE SECRETS AND ARE CONFID-ENTIAL AND PROPRIETARY PRODUCTS OF ansys , INC., ITS SUBSIDIARIES, OR software productsand documentation are furnished by ansys , Inc., its subsidiaries, or affiliates under a software license agreementthat contains provisions concerning non-disclosure, copying, length and nature of use, compliance with exportinglaws, warranties, disclaimers, limitations of liability, and remedies, and other provisions.

3 The software productsand documentation may be used, disclosed, transferred, or copied only in accordance with the terms and conditionsof that software license , Inc. is certified to ISO 9001 Government RightsFor 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 , license agreement and FAR (for non-DOD licenses).Third-Party SoftwareSee the legal information in the product help files for the complete Legal Notice for ansys proprietary softwareand third-party software.

4 If you are unable to access the Legal Notice, please contact ansys , in the of ContentsUsing This Manual .. xxi1. The Contents of This Manual .. xxi2. The Contents of the Fluent Manuals .. xxii3. Typographical Conventions .. xxiii4. Mathematical Conventions .. xxiv5. Technical Support .. xxv1. Overview of User-Defined Functions (UDFs).. What is a User-Defined Function? .. Limitations .. Defining Your UDF Using DEFINE Macros .. Including the Header File in Your Source File .. Interpreting and Compiling UDFs.. Compiled UDFs.. Interpreted UDFs.. Differences Between Interpreted and Compiled UDFs.

5 Hooking UDFs to Your ansys Fluent Model .. Mesh Terminology .. Data Types in ansys Fluent .. UDF Calling Sequence in the Solution Process .. Pressure-Based Segregated Solver .. Pressure-Based Coupled Solver .. Density-Based Solver .. Special Considerations for Multiphase UDFs.. Multiphase-specific Data Types .. Macros.. Introduction .. General Purpose DEFINE Macros .. Description .. Usage .. Example 1.. Example 2.. Hooking an Adjust UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking an Adaptive Time Step UDF to ansys Fluent .

6 Description .. Usage .. Example.. Hooking an Execute-at-End UDF to ansys Fluent .. Description .. Usage .. Hooking an Execute-at-Exit UDF to ansys Fluent .. Description .. Usage .. 21iiiRelease - SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationof ansys , Inc. and its subsidiaries and Example.. Hooking an Execute From GUI UDF to ansys Fluent .. Description .. Usage .. Example 1.. Example 2.. Hooking an Execute On Loading UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking an Execute Aft er Reading Case and Data File UDF to ansys Fluent .

7 Description .. Usage .. Example.. Hooking an Initialization UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking an On-Demand UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking an Output Parameter UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking a Read/Write Case or Data File UDF to ansys Fluent .. Model-Specific DEFINE Macros .. Description .. Usage .. Example.. Hooking an Anisotropic Conductivity UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking a Chemistry Step UDF to ansys Fluent .

8 Description .. Usage .. Hooking a Mixing Constant UDF to ansys Fluent .. Description .. Usage .. Example.. 43 Release - SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationof ansys , Inc. and its subsidiaries and Hooking a Diffusivity UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking a Discrete Ordinates Model (DOM) Diffuse Reflectivity UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking a DOM Source UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking a Discrete Ordinates Model (DOM) Specular Reflectivity UDF to ansys Flu-ent.

9 Description .. Usage .. Example.. Hooking an ECFM Spark Source UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking an Emissivity Weighting Factor UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking a Frame Motion UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking a Gra y Band Coefficient UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking a Heat Flux UDF to ansys Fluent .. Description .. Usage .. Example.. Hooking an Ignition Source UDF to ansys Fluent .. Description .. Usage.

10 Example.. Hooking a Net Reaction Rat e UDF to ansys Fluent .. 58vRelease - SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationof ansys , Inc. and its subsidiaries and .. Description .. Usage .. Example 1.. Example 2.. Hooking a NOx Rat e UDF to ansys Fluent .. Description .. Usage .. Example 1.. Example 2.. Hooking a DEFINE_PDF_TABLE UDF to ansys Fluent .. Description .. Usage .. Auxiliary function .. Example 1.. Example 2.. Hooking a Particle Reaction Rat e UDF to ansys Fluent .. UDFs.. Description.