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ANSYS Fluent UDF 14.0官方手册:代码模板宝库
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本资源是一份详细的ANSYS FLUENT UDF (User-Defined Functions) 手册,适用于Release 14.0版本。ANSYS, Inc. 是一家知名的工程仿真软件公司,提供强大的流体动力学模拟工具FLUENT。UDF是用户自定义函数的关键组成部分,它允许用户扩展FLUENT的功能,实现特定领域的定制化计算和处理。
在该手册中,用户可以找到关于如何创建、编写和应用UDF的深入指南。它涵盖了以下几个关键知识点:
1. **UDF概述**:手册首先介绍了什么是用户定义函数(UDF),以及它们在FLUENT中的作用。UDF允许用户扩展FLUENT的标准功能,以便处理复杂的物理现象或解决特定问题,如材料模型、边界条件处理和求解器集成等。
2. **版本兼容性**:此版本适用于Release 14.0,意味着手册中的内容可能与后续版本略有差异,但基本原理和技术保持一致。用户需要确保使用的UDF代码兼容他们的FLUENT环境。
3. **版权和商标信息**:手册声明所有权利归SASIP, Inc. 所有,强调未经授权的使用、复制或分发是被禁止的。此外,它列出了ANSYS公司及其子公司的商标和注册商标,包括FLUENT、CFX等,以及相关品牌的产权归属。
4. **免责声明**:文档包含了ANSYS的商业秘密和专有技术,用户在使用时必须遵守保密协议,不得泄露或用于非法目的。这些软件产品和文档是ANSYS提供的机密财产。
5. **编写和使用指导**:手册详细解释了如何编写有效的UDF代码,包括语法规范、数据类型、函数参数、错误处理和调试技巧。还包括了如何将UDF整合到FLUENT的工作流程中,确保它们能够无缝地与内置求解器协同工作。
6. **实例与教程**:手册可能包含一些示例UDF代码,帮助读者理解概念,并通过实践来掌握UDF的创建和应用。这对于初学者和高级用户都是宝贵的资源。
这份ANSYS FLUENT UDF Manual 14.0提供了全面的技术支持,是FLUENT用户扩展其软件功能、提升模拟精度的重要参考资料。对于任何想要利用用户自定义功能进行高级仿真分析的工程师来说,这是一个不可或缺的工具。
6.2.20. Hooking DEFINE_REACTING_CHANNEL_SOLVER UDFs ................................................. 328
6.2.21. Hooking DEFINE_SCAT_PHASE_FUNC UDFs ................................................................... 329
6.2.22. Hooking DEFINE_SOLAR_INTENSITY UDFs ................................................................... 331
6.2.23. Hooking DEFINE_SOLIDIFICATION_PARAMS UDFs ...................................................... 332
6.2.24. Hooking DEFINE_SOURCE UDFs ....................................................................................... 333
6.2.25. Hooking DEFINE_SOX_RATE UDFs .................................................................................. 335
6.2.26. Hooking DEFINE_SPARK_GEOM UDFs .............................................................................. 337
6.2.27. Hooking DEFINE_SPECIFIC_HEAT UDFs ....................................................................... 338
6.2.28. Hooking DEFINE_SR_RATE UDFs .................................................................................... 339
6.2.29. Hooking DEFINE_THICKENED_FLAME_MODEL UDFs ...................................................... 340
6.2.30. Hooking DEFINE_TRANS UDFs ......................................................................................... 341
6.2.31. Hooking DEFINE_TRANSIENT_PROFILE UDFs .............................................................. 342
6.2.32. Hooking DEFINE_TURB_PREMIX_SOURCE UDFs ............................................................ 343
6.2.33. Hooking DEFINE_TURB_SCHMIDT UDFs ......................................................................... 344
6.2.34. Hooking DEFINE_TURBULENT_VISCOSITY UDFs .......................................................... 345
6.2.35. Hooking DEFINE_VR_RATE UDFs .................................................................................... 346
6.2.36. Hooking DEFINE_WALL_FUNCTIONS UDFs ..................................................................... 347
6.2.37. Hooking DEFINE_WSGGM_ABS_COEFF UDFs ................................................................... 348
6.3. Hooking Multiphase UDFs ............................................................................................................. 350
6.3.1. Hooking DEFINE_BOILING_PROPERTY UDFs ................................................................... 350
6.3.2. Hooking DEFINE_CAVITATION_RATE UDFs ..................................................................... 351
6.3.3. Hooking DEFINE_EXCHANGE_PROPERTY UDFs ................................................................ 353
6.3.4. Hooking DEFINE_HET_RXN_RATE UDFs ........................................................................... 355
6.3.5. Hooking DEFINE_LINEARIZED_MASS_TRANSFER UDFs ................................................. 356
6.3.6. Hooking DEFINE_MASS_TRANSFER UDFs ......................................................................... 356
6.3.7. Hooking DEFINE_VECTOR_EXCHANGE_PROPERTY UDFs ................................................. 357
6.4. Hooking Discrete Phase Model (DPM) UDFs ................................................................................... 359
6.4.1. Hooking DEFINE_DPM_BC UDFs ......................................................................................... 360
6.4.2. Hooking DEFINE_DPM_BODY_FORCE UDFs ....................................................................... 361
6.4.3. Hooking DEFINE_DPM_DRAG UDFs .................................................................................... 361
6.4.4. Hooking DEFINE_DPM_EROSION UDFs .............................................................................. 362
6.4.5. Hooking DEFINE_DPM_HEAT_MASS UDFs ......................................................................... 363
6.4.6. Hooking DEFINE_DPM_INJECTION_INIT UDFs .............................................................. 364
6.4.7. Hooking DEFINE_DPM_LAW UDFs ...................................................................................... 365
6.4.8. Hooking DEFINE_DPM_OUTPUT UDFs ................................................................................ 366
6.4.9. Hooking DEFINE_DPM_PROPERTY UDFs ........................................................................... 367
6.4.10. Hooking DEFINE_DPM_SCALAR_UPDATE UDFs .............................................................. 369
6.4.11. Hooking DEFINE_DPM_SOURCE UDFs .............................................................................. 370
6.4.12. Hooking DEFINE_DPM_SPRAY_COLLIDE UDFs .............................................................. 370
6.4.13. Hooking DEFINE_DPM_SWITCH UDFs .............................................................................. 371
6.4.14. Hooking DEFINE_DPM_TIMESTEP UDFs ......................................................................... 372
6.4.15. Hooking DEFINE_DPM_VP_EQUILIB UDFs ..................................................................... 373
6.5. Hooking Dynamic Mesh UDFs ....................................................................................................... 375
6.5.1. Hooking DEFINE_CG_MOTION UDFs .................................................................................. 375
6.5.2. Hooking DEFINE_DYNAMIC_ZONE_PROPERTY UDFs ........................................................ 376
6.5.2.1. Hooking a Swirl Center UDF ......................................................................................... 376
6.5.2.2. Hooking a Variable Cell Layering Height UDF ................................................................ 377
6.5.3. Hooking DEFINE_GEOM UDFs ............................................................................................. 378
6.5.4. Hooking DEFINE_GRID_MOTION UDFs .............................................................................. 379
6.5.5. Hooking DEFINE_SDOF_PROPERTIES UDFs ..................................................................... 380
6.6. Hooking User-Defined Scalar (UDS) Transport Equation UDFs ........................................................ 381
6.6.1. Hooking DEFINE_ANISOTROPIC_DIFFUSIVITY UDFs ................................................... 382
Release 14.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
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6.6.2. Hooking DEFINE_UDS_FLUX UDFs .................................................................................... 383
6.6.3. Hooking DEFINE_UDS_UNSTEADY UDFs ........................................................................... 384
6.7. Common Errors While Hooking a UDF to ANSYS FLUENT ................................................................ 385
7. Parallel Considerations ....................................................................................................................... 387
7.1. Overview of Parallel ANSYS FLUENT ............................................................................................... 387
7.1.1. Command Transfer and Communication ............................................................................... 389
7.2. Cells and Faces in a Partitioned Mesh ............................................................................................. 390
7.2.1. Cell Types in a Partitioned Mesh ............................................................................................ 390
7.2.2. Faces at Partition Boundaries ................................................................................................ 391
7.2.3. PRINCIPAL_FACE_P ......................................................................................................... 392
7.2.4. Exterior Thread Storage ........................................................................................................ 392
7.2.5. Extended Neighborhood ...................................................................................................... 392
7.3. Parallelizing Your Serial UDF .......................................................................................................... 394
7.4. Parallelization of Discrete Phase Model (DPM) UDFs ....................................................................... 394
7.5. Macros for Parallel UDFs ................................................................................................................ 395
7.5.1. Compiler Directives .............................................................................................................. 395
7.5.2. Communicating Between the Host and Node Processes ........................................................ 397
7.5.2.1. Host-to-Node Data Transfer .......................................................................................... 397
7.5.2.2. Node-to-Host Data Transfer .......................................................................................... 398
7.5.3. Predicates ............................................................................................................................ 398
7.5.4. Global Reduction Macros ...................................................................................................... 399
7.5.4.1. Global Summations ..................................................................................................... 400
7.5.4.2. Global Maximums and Minimums ................................................................................ 400
7.5.4.3. Global Logicals ............................................................................................................ 401
7.5.4.4. Global Synchronization ................................................................................................ 402
7.5.5. Looping Macros ................................................................................................................... 402
7.5.5.1. Looping Over Cells ....................................................................................................... 402
7.5.5.2. Interior Cell Looping Macro .......................................................................................... 402
7.5.5.3. Exterior Cell Looping Macro ......................................................................................... 403
7.5.5.4. Interior and Exterior Cell Looping Macro ...................................................................... 403
7.5.5.5. Looping Over Faces ..................................................................................................... 404
7.5.6. Cell and Face Partition ID Macros .......................................................................................... 405
7.5.6.1. Cell Partition IDs .......................................................................................................... 405
7.5.6.2. Face Partition IDs ......................................................................................................... 406
7.5.7. Message Displaying Macros .................................................................................................. 406
7.5.8. Message Passing Macros ...................................................................................................... 407
7.5.9. Macros for Exchanging Data Between Compute Nodes ......................................................... 409
7.6. Limitations of Parallel UDFs ........................................................................................................... 410
7.7. Process Identification .................................................................................................................... 411
7.8. Parallel UDF Example .................................................................................................................... 412
7.9. Reading and Writing Files in Parallel .............................................................................................. 413
7.9.1. Reading Files in Parallel ........................................................................................................ 414
7.9.2.Writing Files in Parallel .......................................................................................................... 414
8. Examples ............................................................................................................................................. 417
8.1. Step-By-Step UDF Example ........................................................................................................... 417
8.1.1. Process Overview ................................................................................................................. 417
8.1.2. Step 1: Define Your Problem .................................................................................................. 418
8.1.3. Step 2: Create a C Source File ................................................................................................ 420
8.1.4. Step 3: Start ANSYS FLUENT and Read (or Set Up) the Case File .............................................. 420
8.1.5. Step 4: Interpret or Compile the Source File ........................................................................... 421
8.1.5.1. Interpret the Source File ............................................................................................... 421
8.1.5.2. Compile the Source File ............................................................................................... 423
xvii
Release 14.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
ANSYS FLUENT UDF Manual
8.1.6. Step 5: Hook the UDF to ANSYS FLUENT ................................................................................ 426
8.1.7. Step 6: Run the Calculation ................................................................................................... 426
8.1.8. Step 7: Analyze the Numerical Solution and Compare to Expected Results ............................. 427
8.2. Detailed UDF Examples ................................................................................................................. 427
8.2.1. Boundary Conditions ............................................................................................................ 427
8.2.1.1. Parabolic Velocity Inlet Profile in an Elbow Duct ............................................................ 428
8.2.1.2.Transient Pressure Outlet Profile for Flow in a Tube ....................................................... 432
8.2.2. Source Terms ........................................................................................................................ 437
8.2.2.1. Adding a Momentum Source to a Duct Flow ................................................................ 437
8.2.3. Physical Properties ............................................................................................................... 442
8.2.3.1. Solidification via a Temperature-Dependent Viscosity ................................................... 442
8.2.4. Reaction Rates ..................................................................................................................... 445
8.2.4.1. Volume Reaction Rate .................................................................................................. 446
8.2.5. User-Defined Scalars ............................................................................................................ 449
8.2.5.1. Postprocessing Using User-Defined Scalars .................................................................. 449
8.2.5.2. Implementing ANSYS FLUENT’s P-1 Radiation Model Using User-Defined Scalars .......... 451
8.2.6. User-Defined Real Gas Models (UDRGM) ............................................................................... 454
8.2.6.1. UDRGM Example: Redlich-Kwong Equation of State ...................................................... 454
8.2.6.2. Specific Volume and Density ........................................................................................ 455
8.2.6.3. Derivatives of Specific Volume and Density .................................................................. 456
8.2.6.4. Specific Heat and Enthalpy ........................................................................................... 457
8.2.6.5. Entropy ....................................................................................................................... 458
8.2.6.6. Speed of Sound ........................................................................................................... 458
8.2.6.7. Viscosity and Thermal Conductivity .............................................................................. 459
8.2.6.8. Using the Redlich-Kwong Real Gas UDRGM .................................................................. 460
8.2.6.9. Redlich-Kwong Real Gas UDRGM Code Listing .............................................................. 460
8.2.6.9.1. UDRGM Example: Multiple-Species Real Gas Model .............................................. 466
8.2.6.9.2. UDRGM Example: Real Gas Model with Volumetric Reactions ............................... 472
A. C Programming Basics ........................................................................................................................... 485
A.1. Introduction ................................................................................................................................. 485
A.2. Commenting Your C Code ............................................................................................................. 485
A.3. C Data Types in ANSYS FLUENT ..................................................................................................... 486
A.4. Constants ..................................................................................................................................... 486
A.5.Variables ....................................................................................................................................... 486
A.5.1. Declaring Variables .............................................................................................................. 487
A.5.2. External Variables ................................................................................................................. 487
A.5.2.1. Example ...................................................................................................................... 487
A.5.3. Static Variables ..................................................................................................................... 488
A.5.3.1. Example - Static Global Variable ................................................................................... 488
A.6. User-Defined Data Types ............................................................................................................... 489
A.6.1. Example .............................................................................................................................. 489
A.7. Casting ......................................................................................................................................... 489
A.8. Functions ..................................................................................................................................... 489
A.9. Arrays ........................................................................................................................................... 490
A.9.1. Examples ............................................................................................................................. 490
A.10. Pointers ...................................................................................................................................... 490
A.10.1. Pointers as Function Arguments ......................................................................................... 491
A.11. Control Statements ..................................................................................................................... 491
A.11.1. if Statement ..................................................................................................................... 491
A.11.1.1. Example .................................................................................................................... 491
A.11.2. if-else Statement .......................................................................................................... 491
A.11.2.1. Example .................................................................................................................... 491
Release 14.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
xviii
ANSYS FLUENT UDF Manual
A.11.3. for Loops ......................................................................................................................... 492
A.11.3.1. Example .................................................................................................................... 492
A.12. Common C Operators ................................................................................................................. 492
A.12.1. Arithmetic Operators ......................................................................................................... 492
A.12.2. Logical Operators ............................................................................................................... 493
A.13. C Library Functions ..................................................................................................................... 493
A.13.1. Trigonometric Functions .................................................................................................... 493
A.13.2. Miscellaneous Mathematical Functions ............................................................................... 493
A.13.3. Standard I/O Functions ....................................................................................................... 494
A.13.3.1. fopen ...................................................................................................................... 495
A.13.3.2. fclose .................................................................................................................... 495
A.13.3.3. printf .................................................................................................................... 495
A.13.3.4. fprintf .................................................................................................................. 496
A.13.3.5. fscanf .................................................................................................................... 496
A.14. Preprocessor Directives ............................................................................................................... 496
A.14.1. Macro Substitution Directive Using #define .................................................................... 497
A.14.2. File Inclusion Directive Using #include ............................................................................ 497
A.15. Comparison with FORTRAN ......................................................................................................... 497
B. DEFINE Macro Definitions .................................................................................................................... 499
B.1. General Solver DEFINE Macros ..................................................................................................... 499
B.2. Model-Specific DEFINE Macro Definitions .................................................................................... 499
B.3. Multiphase DEFINE Macros .......................................................................................................... 501
B.4. Dynamic Mesh Model DEFINE Macros ......................................................................................... 501
B.5. Discrete Phase Model DEFINE Macros .......................................................................................... 502
B.6. User-Defined Scalar (UDS) DEFINE Macros ................................................................................... 502
C. Quick Reference Guide for Multiphase DEFINE Macros .......................................................................... 505
C.1.VOF Model .................................................................................................................................... 505
C.2. Mixture Model .............................................................................................................................. 507
C.3. Eulerian Model - Laminar Flow ...................................................................................................... 510
C.4. Eulerian Model - Mixture Turbulence Flow ..................................................................................... 513
C.5. Eulerian Model - Dispersed Turbulence Flow .................................................................................. 516
C.6. Eulerian Model - Per Phase Turbulence Flow .................................................................................. 518
Bibliography ............................................................................................................................................. 521
Index ........................................................................................................................................................ 523
xix
Release 14.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
ANSYS FLUENT UDF Manual
Release 14.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
xx
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