Ansys 2022 R1 Fluent 用户定义函数手册解析

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"Ansys_2022 R1 Fluent UDF Manual 提供了关于如何定制Ansys Fluent软件的详细指南，特别关注用户定义的函数(UDF)的开发和应用。该手册由ANSYS公司在2022年1月发布，是用于版本2022 R1的更新。它涵盖了流体动力学模拟、UDF编程以及如何增强Fluent求解器的功能。" 在Ansys Fluent中，用户定义的函数(UDF)是扩展软件功能的关键工具，允许用户自定义物理模型、边界条件、源项等。通过UDF，工程师和研究人员能够解决特定的工程问题，模拟复杂流动现象，或实现特定的计算需求。以下是一些关键的知识点： 1. **UDF基础知识**：了解UDF的基本结构，包括头文件、源文件和初始化函数。头文件定义了函数原型和宏，源文件包含实际的函数实现，而初始化函数则在Fluent启动时调用，用于注册UDF。 2. **数据类型和函数库**：掌握Fluent中的数据类型，如REAL、INTEGER和VECTOR，以及如何使用内置的库函数进行数学运算和流体动力学相关的计算。 3. **流体动力学模型**：学习如何通过UDF创建新的流体模型，如湍流模型、化学反应模型或多相流模型。这涉及到编写处理速度、压力、温度和浓度等物理量的函数。 4. **边界条件**：UDF可以用于定义独特的边界条件，例如非标准的入口条件、壁面行为或远场条件。这使得用户能够模拟不常见的流场情况。 5. **源项**：UDF也可用于添加自定义源项，例如反应源项、对流源项或扩散源项，这在处理化学反应、颗粒输运或热量产生等问题时非常有用。 6. **编程语言**：Ansys Fluent的UDF主要基于C语言，因此熟悉C语言的基本语法和结构对于编写UDF至关重要。 7. **调试和测试**：理解如何在Fluent环境中编译、加载和测试UDF，以及如何使用Fluent的输出结果进行调试。 8. **性能优化**：学习如何优化UDF代码以提高计算效率，这可能涉及到并行化处理、内存管理和减少不必要的计算。 9. **错误处理和日志记录**：在编写UDF时，了解如何正确处理错误和异常，以及如何记录和分析运行日志，这对于诊断问题和改进代码至关重要。 10. **案例研究和示例**：手册通常会提供各种UDF示例，这些例子可以帮助初学者快速上手，并理解UDF在实际问题中的应用。 Ansys_2022 R1 Fluent UDF Manual是学习和开发UDF的重要参考资料，它提供了全面的技术细节和实用的指导，使用户能够充分利用Fluent的灵活性和强大功能，以适应各种复杂的工程和科研挑战。

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2.7.7.4. Hooking a DEFINE_BATTERY_PARAMETER_ECM UDF to Ansys Fluent .............. 297

2.7.8. DEFINE_BATTERY_PARAMETER_NTGK ..................................................................... 297

2.7.8.1. Description ............................................................................................................ 297

2.7.8.2. Usage .................................................................................................................... 297

2.7.8.3. Example ................................................................................................................ 298

2.7.8.4. Hooking a DEFINE_BATTERY_PARAMETER_NTGK UDF to Ansys Fluent ............. 298

2.7.9. DEFINE_BATTERY_PROPERTY .................................................................................. 298

2.7.9.1. Description ............................................................................................................ 298

2.7.9.2. Usage .................................................................................................................... 298

2.7.9.3. Example ................................................................................................................ 299

2.7.9.4. Hooking a DEFINE_BATTERY_PROPERTY UDF to Ansys Fluent ........................... 299

2.8. User-Defined Scalar (UDS) Transport Equation DEFINE Macros ............................................... 299

2.8.1. Introduction ................................................................................................................... 300

2.8.1.1. Diffusion Coefficient UDFs ..................................................................................... 300

2.8.1.2. Flux UDFs .............................................................................................................. 300

2.8.1.3. Unsteady UDFs ...................................................................................................... 300

2.8.1.4. Source Term UDFs .................................................................................................. 300

2.8.1.5. Fixed Value Boundary Condition UDFs .................................................................... 301

2.8.1.6. Wall, Inflow, and Outflow Boundary Condition UDFs ............................................... 301

2.8.2. DEFINE_ANISOTROPIC_DIFFUSIVITY ................................................................... 301

2.8.2.1. Description ............................................................................................................ 301

2.8.2.2. Usage .................................................................................................................... 301

2.8.2.3. Example ................................................................................................................ 302

2.8.2.4. Hooking an Anisotropic Diffusivity UDF to Ansys Fluent .......................................... 303

2.8.3. DEFINE_UDS_FLUX .................................................................................................... 303

2.8.3.1. Description ............................................................................................................ 303

2.8.3.2. Usage .................................................................................................................... 303

2.8.3.3. Example ................................................................................................................ 305

2.8.3.4. Hooking a UDS Flux Function to Ansys Fluent ......................................................... 306

2.8.4. DEFINE_UDS_UNSTEADY ........................................................................................... 306

2.8.4.1. Description ............................................................................................................ 306

2.8.4.2. Usage .................................................................................................................... 307

2.8.4.3. Example ................................................................................................................ 307

2.8.4.4. Hooking a UDS Unsteady Function to Ansys Fluent ................................................. 308

3. Additional Macros for Writing UDFs ............................................................................................. 309

3.1. Introduction ........................................................................................................................... 309

3.2. Data Access Macros ................................................................................................................. 311

3.2.1. Axisymmetric Considerations for Data Access Macros ...................................................... 311

3.2.2. Node Macros .................................................................................................................. 311

3.2.2.1. Node Position ........................................................................................................ 312

3.2.2.2. Number of Nodes in a Face (F_NNODES) ................................................................ 312

3.2.3. Cell Macros .................................................................................................................... 312

3.2.3.1. Cell Centroid (C_CENTROID) ................................................................................. 312

3.2.3.2. Cell Volume (C_VOLUME) ....................................................................................... 313

3.2.3.3. Number of Faces (C_NFACES) and Nodes (C_NNODES) in a Cell ............................. 313

3.2.3.4. Cell Face Index (C_FACE) ....................................................................................... 313

3.2.3.5. Cell Face Thread (C_FACE_THREAD) ..................................................................... 314

3.2.3.6. Flow Variable Macros for Cells ................................................................................ 314

3.2.3.6.1. Species Fractions Calculations with the Non- and Partially- Premixed Mod-

els .............................................................................................................................. 315

3.2.3.7. Gradient (G) and Reconstruction Gradient (RG) Vector Macros ................................ 316

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3.2.3.8. Previous Time Step Macros ..................................................................................... 321

3.2.3.9. Derivative Macros .................................................................................................. 323

3.2.3.10. Material Property Macros ..................................................................................... 323

3.2.3.11. Reynolds Stress Model Macros ............................................................................. 325

3.2.3.12. VOF Multiphase Model Macro .............................................................................. 325

3.2.4. Face Macros ................................................................................................................... 326

3.2.4.1. Face Centroid (F_CENTROID) ............................................................................... 326

3.2.4.2. Face Area Vector (F_AREA) .................................................................................... 326

3.2.4.3. Flow Variable Macros for Boundary Faces ............................................................... 327

3.2.4.4. Flow Variable Macros at Interior and Boundary Faces .............................................. 328

3.2.5. Connectivity Macros ....................................................................................................... 328

3.2.5.1. Adjacent Cell Index (F_C0, F_C1) .......................................................................... 329

3.2.5.2. Adjacent Cell Thread (THREAD_T0, THREAD_T1) .................................................. 330

3.2.5.3. Interior Face Geometry (INTERIOR_FACE_GEOMETRY) ....................................... 330

3.2.5.4. Boundary Face Geometry (BOUNDARY_FACE_GEOMETRY) ................................... 331

3.2.5.5. Boundary Face Thread (BOUNDARY_FACE_THREAD) ............................................. 331

3.2.5.6. Boundary Secondary Gradient Source (BOUNDARY_SECONDARY_GRADI-

ENT_SOURCE) ................................................................................................................. 331

3.2.6. Special Macros ............................................................................................................... 332

3.2.6.1.Thread Pointer for Zone ID (Lookup_Thread) ...................................................... 332

3.2.6.2. Zone ID (THREAD_ID) ........................................................................................... 334

3.2.6.3. Domain Pointer (Get_Domain) ............................................................................ 334

3.2.6.4. Set Boundary Condition Value (F_PROFILE) ......................................................... 335

3.2.6.5. THREAD_SHADOW(t) ......................................................................................... 336

3.2.7. Time-Sampled Data ........................................................................................................ 337

3.2.8. Model-Specific Macros ................................................................................................... 339

3.2.8.1. DPM Macros .......................................................................................................... 339

3.2.8.2. NOx Macros ........................................................................................................... 345

3.2.8.3. Dynamic Mesh Macros ........................................................................................... 347

3.2.8.4. Battery Model Macros ............................................................................................ 347

3.2.9. NIST Real Gas Saturation Properties ................................................................................ 348

3.2.9.1. Saturation Curves for Single-Species ...................................................................... 348

3.2.9.2. Saturation Curves for Multi-Species (UDF 1) ............................................................ 349

3.2.9.3. Saturation Curves for Multi-Species (UDF 2) ............................................................ 350

3.2.9.3.1. Using Multi-Species User-Defined Function (UDF2) ........................................ 351

3.2.9.3.2. Example Multi-Species User-Defined Function (UDF2) .................................... 351

3.2.10. NIST Real Gas UDF Access Macro for Multi-Species Mixtures .......................................... 352

3.2.10.1. Description .......................................................................................................... 352

3.2.10.2. Using get_prop_NIST_msp ............................................................................ 354

3.2.10.3. Error Handling ..................................................................................................... 355

3.2.10.4. Example .............................................................................................................. 355

3.2.11. User-Defined Scalar (UDS) Transport Equation Macros ................................................... 357

3.2.11.1. Set_User_Scalar_Name ............................................................................... 357

3.2.11.2. F_UDSI ............................................................................................................. 358

3.2.11.3. C_UDSI ............................................................................................................. 358

3.2.11.4. Reserving UDS Variables ...................................................................................... 359

3.2.11.5. Reserve_User_Scalar_Vars ...................................................................... 359

3.2.11.6. Unreserving UDS Variables ................................................................................... 359

3.2.11.7. N_UDS ................................................................................................................ 360

3.2.12. User-Defined Memory (UDM) Macros ............................................................................ 360

3.2.12.1. Set_User_Memory_Name ............................................................................... 360

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Customization Manual

3.2.12.2. Set_User_Node_Memory_Name .................................................................... 361

3.2.12.3. F_UDMI ............................................................................................................. 361

3.2.12.4. C_UDMI ............................................................................................................. 362

3.2.12.5. N_UDMI ............................................................................................................. 362

3.2.12.6. Example UDF that Utilizes UDM and UDS Variables ............................................... 363

3.2.12.7. Reserving UDM Variables Using Reserve_User_Memory_Vars ..................... 364

3.2.12.8. Example 1 ............................................................................................................ 365

3.2.12.9. Example 2 ............................................................................................................ 366

3.2.12.10. Unreserving UDM Variables ................................................................................ 367

3.3. Looping Macros ...................................................................................................................... 367

3.3.1. Looping Over Cell Threads in a Domain (thread_loop_c) ........................................... 368

3.3.2. Looping Over Face Threads in a Domain (thread_loop_f) .......................................... 368

3.3.3. Looping Over Cells in a Cell Thread (begin...end_c_loop) ....................................... 368

3.3.4. Looping Over Faces in a Face Thread (begin...end_f_loop) .................................... 369

3.3.5. Looping Over Faces of a Cell (c_face_loop) ................................................................ 369

3.3.6. Looping Over Nodes of a Cell (c_node_loop) ............................................................... 370

3.3.7. Looping Over Nodes of a Face (f_node_loop) ............................................................. 370

3.3.8. Overset Mesh Looping Macros ........................................................................................ 370

3.3.8.1. Looping Over Overset Interface Cell Threads (thread_loop_overset_c) ......... 371

3.3.8.2. Looping Over Active Overset Cells in a Cell Thread (begin...end_c_loop_active,

begin…end_c_loop_solve) ....................................................................................... 371

3.3.8.2.1. Example 1 ..................................................................................................... 372

3.3.8.2.2. Example 2 ..................................................................................................... 372

3.3.8.3. Looping Over Faces in a Face Thread with Overset Mesh (be-

gin...end_f_loop_active) ..................................................................................... 372

3.3.8.3.1. Example ....................................................................................................... 373

3.3.9. Multiphase Looping Macros ........................................................................................... 374

3.3.9.1. Looping Over Phase Domains in Mixture (sub_domain_loop) ............................ 374

3.3.9.2. Looping Over Phase Threads in Mixture (sub_thread_loop) .............................. 375

3.3.9.3. Looping Over Phase Cell Threads in Mixture (mp_thread_loop_c) ..................... 376

3.3.9.4. Looping Over Phase Face Threads in Mixture (mp_thread_loop_f) .................... 376

3.3.10. Advanced Multiphase Macros ....................................................................................... 377

3.3.10.1. Phase Domain Pointer (DOMAIN_SUB_DOMAIN) ................................................. 377

3.3.10.2. Phase-Level Thread Pointer (THREAD_SUB_THREAD) .......................................... 378

3.3.10.3. Phase Thread Pointer Array (THREAD_SUB_THREADS) ........................................ 379

3.3.10.4. Mixture Domain Pointer (DOMAIN_SUPER_DOMAIN) .......................................... 379

3.3.10.5. Mixture Thread Pointer (THREAD_SUPER_THREAD) ............................................ 379

3.3.10.6. Domain ID (DOMAIN_ID) .................................................................................... 380

3.3.10.7. Phase Domain Index (PHASE_DOMAIN_INDEX) .................................................. 380

3.4. Vector and Dimension Macros ................................................................................................. 380

3.4.1. Macros for Dealing with Two and Three Dimensions ........................................................ 381

3.4.1.1. RP_2D and RP_3D ............................................................................................... 381

3.4.2. The ND Macros ............................................................................................................... 381

3.4.2.1. ND_ND ................................................................................................................. 381

3.4.2.2. ND_SUM ............................................................................................................... 382

3.4.2.3. ND_SET ............................................................................................................... 382

3.4.3. The NV Macros ............................................................................................................... 382

3.4.3.1. NV_V .................................................................................................................... 382

3.4.3.2. NV_VV ................................................................................................................. 382

3.4.3.3. NV_V_VS ............................................................................................................. 382

3.4.3.4. NV_VS_VS ........................................................................................................... 383

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3.4.4. Vector Operation Macros ................................................................................................ 383

3.4.4.1.Vector Magnitude Using NV_MAG and NV_MAG2 ................................................... 383

3.4.4.2. Dot Product ........................................................................................................... 383

3.4.4.3. Cross Product ........................................................................................................ 384

3.5.Time-Dependent Macros ......................................................................................................... 384

3.6. Scheme Macros ...................................................................................................................... 386

3.6.1. Defining a Scheme Variable in the Text Interface ............................................................. 386

3.6.2. Accessing a Scheme Variable in the Text Interface ........................................................... 387

3.6.3. Changing a Scheme Variable to Another Value in the Text Interface ................................. 387

3.6.4. Accessing a Scheme Variable in a UDF ............................................................................. 387

3.7. Input/Output Functions .......................................................................................................... 388

3.7.1. Message ...................................................................................................................... 389

3.7.2. Error .......................................................................................................................... 389

3.7.3.The par_fprintf_head and par_fprintf Functions ............................................. 390

3.7.3.1. par_fprintf_head ......................................................................................... 390

3.7.3.2. par_fprintf .................................................................................................... 390

3.8. Miscellaneous Macros ............................................................................................................. 391

3.8.1. Data_Valid_P() ...................................................................................................... 391

3.8.2. FLUID_THREAD_P() .................................................................................................. 391

3.8.3. Get_Report_Definition_Values ....................................................................... 392

3.8.4. M_PI ............................................................................................................................ 394

3.8.5. NULLP & NNULLP ...................................................................................................... 394

3.8.6. N_UDM .......................................................................................................................... 395

3.8.7. N_UDS .......................................................................................................................... 395

3.8.8. SQR(k) ........................................................................................................................ 395

3.8.9. UNIVERSAL_GAS_CONSTANT ..................................................................................... 395

4. Interpreting UDFs .......................................................................................................................... 397

4.1. Introduction ........................................................................................................................... 397

4.1.1. Location of the udf.h File ............................................................................................. 397

4.1.2. Limitations ..................................................................................................................... 398

4.2. Interpreting a UDF Source File Using the Interpreted UDFs Dialog Box ..................................... 399

4.3. Common Errors Made While Interpreting A Source File ............................................................ 401

5. Compiling UDFs ............................................................................................................................. 403

5.1. Introduction ........................................................................................................................... 404

5.1.1. Location of the udf.h File ............................................................................................. 405

5.1.2. Compilers ...................................................................................................................... 405

5.2. Compiling a UDF Using the GUI ............................................................................................... 407

5.3. Compile a UDF Using the TUI ................................................................................................... 411

5.3.1. Set Up the Directory Structure ........................................................................................ 412

5.3.1.1. Windows Systems .................................................................................................. 412

5.3.1.2. Linux Systems ........................................................................................................ 413

5.3.2. Build the UDF Library ..................................................................................................... 415

5.3.2.1. Windows Systems .................................................................................................. 415

5.3.2.2. Linux Systems ........................................................................................................ 417

5.3.3. Load the UDF Library ...................................................................................................... 418

5.4. Link Precompiled Object Files From Non-Ansys Fluent Sources ................................................ 418

5.4.1.Windows Systems ........................................................................................................... 418

5.4.2. Linux Systems ................................................................................................................ 419

5.4.3. Example: Link Precompiled Objects to Ansys Fluent ........................................................ 420

5.5. Load and Unload Libraries Using the UDF Library Manager Dialog Box ..................................... 423

5.5.1. Load the UDF Library ...................................................................................................... 423

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Customization Manual

5.5.2. Unload the UDF Library .................................................................................................. 424

5.6. Common Errors When Building and Loading a UDF Library ...................................................... 425

5.6.1. Windows Distributed Parallel .......................................................................................... 426

5.7. Special Considerations for Parallel Ansys Fluent ....................................................................... 426

6. Hooking UDFs to Ansys Fluent ...................................................................................................... 427

6.1. Hooking General Purpose UDFs ............................................................................................... 427

6.1.1. Hooking DEFINE_ADJUST UDFs ................................................................................... 427

6.1.2. Hooking DEFINE_DELTAT UDFs ................................................................................... 429

6.1.3. Hooking DEFINE_EXECUTE_AT_END UDFs ................................................................. 430

6.1.4. Hooking DEFINE_EXECUTE_AT_EXIT UDFs ............................................................... 431

6.1.5. Hooking DEFINE_INIT UDFs ....................................................................................... 433

6.1.6. Hooking DEFINE_ON_DEMAND UDFs ............................................................................ 435

6.1.7. Hooking DEFINE_RW_FILE and DEFINE_RW_HDF_FILE UDFs ................................. 436

6.1.8. User-Defined Memory Storage ....................................................................................... 438

6.2. Hooking Model-Specific UDFs ................................................................................................. 438

6.2.1. Hooking DEFINE_ANISOTROPIC_CONDUCTIVITY UDFs ........................................... 440

6.2.2. Hooking DEFINE_CHEM_STEP UDFs ............................................................................ 442

6.2.3. Hooking DEFINE_CPHI UDFs ....................................................................................... 443

6.2.4. Hooking DEFINE_DIFFUSIVITY UDFs ........................................................................ 446

6.2.5. Hooking DEFINE_DOM_DIFFUSE_REFLECTIVITY UDFs ........................................... 448

6.2.6. Hooking DEFINE_DOM_SOURCE UDFs .......................................................................... 450

6.2.7. Hooking DEFINE_DOM_SPECULAR_REFLECTIVITY UDFs ......................................... 451

6.2.8. Hooking DEFINE_EC_RATE UDFs ................................................................................ 453

6.2.9. Hooking DEFINE_EC_KINETICS_PARAMETER UDFs .................................................. 455

6.2.10. Hooking DEFINE_EDC_MDOT UDFs ............................................................................ 457

6.2.11. Hooking DEFINE_EDC_SCALES UDFs ........................................................................ 458

6.2.12. Hooking DEFINE_EMISSIVITY_WEIGHTING_FACTOR UDFs .................................. 460

6.2.13. Hooking DEFINE_FLAMELET_PARAMETERS UDFs .................................................... 462

6.2.14. Hooking DEFINE_GAP_MODEL_SOURCE UDFs ........................................................... 464

6.2.15. Hooking DEFINE_GRAY_BAND_ABS_COEFF UDFs .................................................... 465

6.2.16. Hooking DEFINE_HEAT_FLUX UDFs .......................................................................... 466

6.2.17. Hooking DEFINE_IGNITE_SOURCE UDFs ................................................................. 467

6.2.18. Hooking DEFINE_MASS_TR_PROPERTY UDFs ........................................................... 468

6.2.19. Hooking DEFINE_NET_REACTION_RATE UDFs ........................................................ 470

6.2.20. Hooking DEFINE_NOX_RATE UDFs ............................................................................ 472

6.2.21. Hooking DEFINE_PERFORATED_CD UDFs ................................................................. 474

6.2.22. Hooking DEFINE_PDF_TABLE UDFs .......................................................................... 477

6.2.23. Hooking DEFINE_PR_RATE UDFs .............................................................................. 478

6.2.24. Hooking DEFINE_PRANDTL UDFs .............................................................................. 480

6.2.25. Hooking DEFINE_PROFILE UDFs .............................................................................. 481

6.2.25.1. Hooking Profiles for UDS Equations ...................................................................... 483

6.2.26. Hooking DEFINE_PROPERTY UDFs ............................................................................ 486

6.2.27. Hooking DEFINE_REACTING_CHANNEL_BC UDFs .................................................... 487

6.2.28. Hooking DEFINE_REACTING_CHANNEL_SOLVER UDFs ........................................... 487

6.2.29. Hooking DEFINE_RELAX_TO_EQUILIBRIUM UDFs .................................................. 489

6.2.30. Hooking DEFINE_SBES_BF UDFs .............................................................................. 490

6.2.31. Hooking DEFINE_SCAT_PHASE_FUNC UDFs ............................................................. 494

6.2.32. Hooking DEFINE_SOLAR_INTENSITY UDFs ............................................................. 495

6.2.33. Hooking DEFINE_SOLIDIFICATION_PARAMS UDFs ................................................ 497

6.2.34. Hooking DEFINE_SOURCE UDFs ................................................................................. 498

6.2.35. Hooking DEFINE_SOOT_MASS_RATES UDFs ............................................................. 500

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