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ANSYS Fluent Tutorial Guide

Release 16.0ANSYS, Inc.

January 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

Table of Contents

Using This Manual ...................................................................................................................................... xiii

1. What’s In This Manual ........................................................................................................................ xiii

2.The Contents of the Fluent Manuals ................................................................................................... xiii

3.Where to Find the Files Used in the Tutorials ....................................................................................... xv

4. How To Use This Manual ..................................................................................................................... xv

4.1. For the Beginner ....................................................................................................................... xv

4.2. For the Experienced User ........................................................................................................... xv

5.Typographical Conventions Used In This Manual ................................................................................ xvi

1. Introduction to Using ANSYS Fluent in ANSYS Workbench: Fluid Flow and Heat Transfer in a Mixing

Elbow .......................................................................................................................................................... 1

1.1. Introduction ..................................................................................................................................... 1

1.2. Prerequisites ..................................................................................................................................... 2

1.3. Problem Description ......................................................................................................................... 2

1.4. Setup and Solution ........................................................................................................................... 3

1.4.1. Preparation .............................................................................................................................. 4

1.4.2. Creating a Fluent Fluid Flow Analysis System in ANSYS Workbench ........................................... 4

1.4.3. Creating the Geometry in ANSYS DesignModeler ...................................................................... 9

1.4.4. Meshing the Geometry in the ANSYS Meshing Application ...................................................... 20

1.4.5. Setting Up the CFD Simulation in ANSYS Fluent ...................................................................... 27

1.4.6. Displaying Results in ANSYS Fluent and CFD-Post .................................................................... 51

1.4.7. Duplicating the Fluent-Based Fluid Flow Analysis System ........................................................ 60

1.4.8. Changing the Geometry in ANSYS DesignModeler .................................................................. 61

1.4.9. Updating the Mesh in the ANSYS Meshing Application ........................................................... 63

1.4.10. Calculating a New Solution in ANSYS Fluent .......................................................................... 65

1.4.11. Comparing the Results of Both Systems in CFD-Post .............................................................. 67

1.5. Summary ........................................................................................................................................ 72

2. Parametric Analysis in ANSYS Workbench Using ANSYS Fluent ........................................................... 73

2.1. Introduction ................................................................................................................................... 73

2.2. Prerequisites ................................................................................................................................... 74

2.3. Problem Description ....................................................................................................................... 74

2.4. Setup and Solution ......................................................................................................................... 77

2.4.1. Preparation ............................................................................................................................ 78

2.4.2. Adding Constraints to ANSYS DesignModeler Parameters in ANSYS Workbench ...................... 78

2.4.3. Setting Up the CFD Simulation in ANSYS Fluent ...................................................................... 87

2.4.4. Defining Input Parameters in ANSYS Fluent and Running the Simulation ................................. 92

2.4.5. Postprocessing and Setting the Output Parameters in ANSYS CFD-Post ................................. 101

2.4.6. Creating Additional Design Points in ANSYS Workbench ........................................................ 113

2.4.7. Postprocessing the New Design Points in CFD-Post ............................................................... 116

2.4.8. Summary ............................................................................................................................. 122

3. Introduction to Using ANSYS Fluent: Fluid Flow and Heat Transfer in a Mixing Elbow ...................... 123

3.1. Introduction ................................................................................................................................. 123

3.2. Prerequisites ................................................................................................................................. 123

3.3. Problem Description ..................................................................................................................... 123

3.4. Setup and Solution ....................................................................................................................... 124

3.4.1. Preparation .......................................................................................................................... 125

3.4.2. Launching ANSYS Fluent ...................................................................................................... 125

3.4.3. Reading the Mesh ................................................................................................................ 128

3.4.4. General Settings ................................................................................................................... 133

3.4.5. Models ................................................................................................................................. 135

3.4.6. Materials .............................................................................................................................. 138

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3.4.7. Cell Zone Conditions ............................................................................................................ 140

3.4.8. Boundary Conditions ............................................................................................................ 142

3.4.9. Solution ............................................................................................................................... 147

3.4.10. Displaying the Preliminary Solution .................................................................................... 157

3.4.11. Using the Coupled Solver ................................................................................................... 172

3.4.12. Adapting the Mesh ............................................................................................................. 175

3.5. Summary ...................................................................................................................................... 191

4. Modeling Periodic Flow and Heat Transfer ......................................................................................... 193

4.1. Introduction ................................................................................................................................. 193

4.2. Prerequisites ................................................................................................................................. 193

4.3. Problem Description ..................................................................................................................... 194

4.4. Setup and Solution ....................................................................................................................... 194

4.4.1. Preparation .......................................................................................................................... 195

4.4.2. Mesh .................................................................................................................................... 195

4.4.3. General Settings ................................................................................................................... 198

4.4.4. Models ................................................................................................................................. 198

4.4.5. Materials .............................................................................................................................. 199

4.4.6. Cell Zone Conditions ............................................................................................................ 200

4.4.7. Periodic Conditions .............................................................................................................. 201

4.4.8. Boundary Conditions ............................................................................................................ 202

4.4.9. Solution ............................................................................................................................... 203

4.4.10. Postprocessing ................................................................................................................... 207

4.5. Summary ...................................................................................................................................... 218

4.6. Further Improvements .................................................................................................................. 219

5. Modeling External Compressible Flow ............................................................................................... 221

5.1. Introduction ................................................................................................................................. 221

5.2. Prerequisites ................................................................................................................................. 221

5.3. Problem Description ..................................................................................................................... 222

5.4. Setup and Solution ....................................................................................................................... 222

5.4.1. Preparation .......................................................................................................................... 222

5.4.2. Mesh .................................................................................................................................... 223

5.4.3. General Settings ................................................................................................................... 226

5.4.4. Models ................................................................................................................................. 226

5.4.5. Materials .............................................................................................................................. 227

5.4.6. Boundary Conditions ............................................................................................................ 229

5.4.7. Operating Conditions ........................................................................................................... 231

5.4.8. Solution ............................................................................................................................... 232

5.4.9. Postprocessing ..................................................................................................................... 249

5.5. Summary ...................................................................................................................................... 255

5.6. Further Improvements .................................................................................................................. 255

6. Modeling Transient Compressible Flow .............................................................................................. 257

6.1. Introduction ................................................................................................................................. 257

6.2. Prerequisites ................................................................................................................................. 257

6.3. Problem Description ..................................................................................................................... 258

6.4. Setup and Solution ....................................................................................................................... 258

6.4.1. Preparation .......................................................................................................................... 258

6.4.2. Reading and Checking the Mesh ........................................................................................... 259

6.4.3. Specifying Solver and Analysis Type ...................................................................................... 261

6.4.4. Specifying the Models .......................................................................................................... 263

6.4.5. Editing the Material Properties ............................................................................................. 264

6.4.6. Setting the Operating Conditions ......................................................................................... 265

6.4.7. Creating the Boundary Conditions ........................................................................................ 266

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Tutorial Guide

6.4.8. Setting the Solution Parameters for Steady Flow and Solving ................................................ 267

6.4.9. Enabling Time Dependence and Setting Transient Conditions ............................................... 281

6.4.10. Specifying Solution Parameters for Transient Flow and Solving ............................................ 284

6.4.11. Saving and Postprocessing Time-Dependent Data Sets ....................................................... 287

6.5. Summary ...................................................................................................................................... 301

6.6. Further Improvements .................................................................................................................. 302

7. Modeling Radiation and Natural Convection ..................................................................................... 303

7.1. Introduction ................................................................................................................................. 303

7.2. Prerequisites ................................................................................................................................. 303

7.3. Problem Description ..................................................................................................................... 303

7.4. Setup and Solution ....................................................................................................................... 304

7.4.1. Preparation .......................................................................................................................... 304

7.4.2. Reading and Checking the Mesh ........................................................................................... 305

7.4.3. Specifying Solver and Analysis Type ...................................................................................... 306

7.4.4. Specifying the Models .......................................................................................................... 307

7.4.5. Defining the Materials .......................................................................................................... 310

7.4.6. Specifying Boundary Conditions ........................................................................................... 312

7.4.7. Obtaining the Solution ......................................................................................................... 316

7.4.8. Postprocessing ..................................................................................................................... 322

7.4.9. Comparing the Contour Plots after Varying Radiating Surfaces .............................................. 338

7.4.10. S2S Definition, Solution, and Postprocessing with Partial Enclosure ...................................... 350

7.5. Summary ...................................................................................................................................... 354

7.6. Further Improvements .................................................................................................................. 354

8. Using the Discrete Ordinates Radiation Model ................................................................................... 355

8.1. Introduction ................................................................................................................................. 355

8.2. Prerequisites ................................................................................................................................. 355

8.3. Problem Description ..................................................................................................................... 356

8.4. Setup and Solution ....................................................................................................................... 356

8.4.1. Preparation .......................................................................................................................... 357

8.4.2. Mesh .................................................................................................................................... 357

8.4.3. General Settings ................................................................................................................... 358

8.4.4. Models ................................................................................................................................. 361

8.4.5. Materials .............................................................................................................................. 362

8.4.6. Cell Zone Conditions ............................................................................................................ 364

8.4.7. Boundary Conditions ............................................................................................................ 366

8.4.8. Solution ............................................................................................................................... 374

8.4.9. Postprocessing ..................................................................................................................... 378

8.4.10. Iterate for Higher Pixels ....................................................................................................... 385

8.4.11. Iterate for Higher Divisions ................................................................................................. 389

8.4.12. Make the Reflector Completely Diffuse ............................................................................... 396

8.4.13. Change the Boundary Type of Baffle ................................................................................... 398

8.5. Summary ...................................................................................................................................... 399

8.6. Further Improvements .................................................................................................................. 399

9. Using a Non-Conformal Mesh ............................................................................................................. 401

9.1. Introduction ................................................................................................................................. 401

9.2. Prerequisites ................................................................................................................................. 401