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ANSYS Fluent Customization Manual

Release 18.1ANSYS, Inc.

April 2017Southpointe

2600 ANSYS Drive

Canonsburg, PA 15317

ANSYS, Inc. and

ANSYS Europe,

ansysinfo@ansys.com

Ltd. are UL

http://www.ansys.com

registered ISO

(T) 724-746-3304

(F) 724-514-9494

9001: 2008

companies.

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 .............................................................................................................. xxxi

5.Technical Support ........................................................................................................................... xxxii

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 ........................................................................... 11

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 .......................................................................................................... 19

2.2.1.1. Description ............................................................................................................. 19

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 ..................................................... 23

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

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 ............................................................................................................... 26

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 .................................................................................................... 30

2.2.9.1. Description ............................................................................................................. 30

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_REPORT_DEFINITION_FN .......................................................................... 31

2.2.10.1. Description ............................................................................................................ 31

2.2.10.2. Usage .................................................................................................................... 32

2.2.10.3. Example ................................................................................................................ 32

2.2.10.4. Hooking a User Defined Report Definition 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 .................................................................................................................. 48

2.3.1.4. Hooking an Anisotropic Conductivity UDF to ANSYS Fluent ...................................... 49

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 ............................................................................................................... 51

of ANSYS, Inc. and its subsidiaries and affiliates.iv

Customization Manual

2.3.3.1. Description ............................................................................................................. 51

2.3.3.2. Usage ...................................................................................................................... 51

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 .................................................................................................................. 52

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 ...................................................................................................................... 53

2.3.5.3. Example .................................................................................................................. 53

2.3.5.4. Hooking a Discrete Ordinates Model (DOM) Diffuse Reflectivity UDF to ANSYS Flu-

ent ..................................................................................................................................... 54

2.3.6. DEFINE_DOM_SOURCE .................................................................................................. 54

2.3.6.1. Description ............................................................................................................. 54

2.3.6.2. Usage ...................................................................................................................... 54

2.3.6.3. Example .................................................................................................................. 55

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 ...................................................................................................................... 56

2.3.7.3. Example .................................................................................................................. 57

2.3.7.4. Hooking a Discrete Ordinates Model (DOM) Specular Reflectivity UDF to ANSYS Flu-

ent ..................................................................................................................................... 57

2.3.8. DEFINE_ECFM_SOURCE ............................................................................................... 57

2.3.8.1. Description ............................................................................................................. 57

2.3.8.2. Usage ...................................................................................................................... 57

2.3.8.3. Example .................................................................................................................. 58

2.3.8.4. Hooking an ECFM Flame Density Area Source UDF to ANSYS Fluent .......................... 58

2.3.9. DEFINE_ECFM_SPARK_SOURCE .................................................................................. 59

2.3.9.1. Description ............................................................................................................. 59

2.3.9.2. Usage ...................................................................................................................... 59

2.3.9.3. Example .................................................................................................................. 59

2.3.9.4. Hooking an ECFM Spark Source UDF to ANSYS Fluent ............................................... 60

2.3.10. DEFINE_EC_RATE ...................................................................................................... 60

2.3.10.1. Description ............................................................................................................ 60

2.3.10.2. Usage .................................................................................................................... 60

2.3.10.3. Example - Electrochemical Reaction Rate Using UDF .............................................. 61

2.3.10.4. Hooking an Electrochemical Reaction Rate UDF to ANSYS Fluent ............................ 61

2.3.11. DEFINE_EDC_SCALES ................................................................................................ 62

2.3.11.1. Description ............................................................................................................ 62

2.3.11.2. Usage .................................................................................................................... 62

2.3.11.3. Example ................................................................................................................ 63

2.3.11.4. Hooking a DEFINE_EDC_SCALES UDF to ANSYS Fluent ....................................... 63

2.3.12. DEFINE_EMISSIVITY_WEIGHTING_FACTOR .......................................................... 63

2.3.12.1. Description ............................................................................................................ 63

2.3.12.2. Usage .................................................................................................................... 63

2.3.12.3. Example ................................................................................................................ 64

2.3.12.4. Hooking an Emissivity Weighting Factor UDF to ANSYS Fluent ................................ 64

2.3.13. DEFINE_FLAMELET_PARAMETERS ............................................................................ 64

2.3.13.1. Description ............................................................................................................ 64

of ANSYS, Inc. and its subsidiaries and affiliates.

Customization Manual

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