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Fluent Beta Features Manual

Release 2022 R1ANSYS, Inc.

January 2022Southpointe

2600 Ansys Drive

ANSYS, Inc. and

ANSYS Europe,

Canonsburg, PA 15317

Ltd. are UL

ansysinfo@ansys.com

registered ISO

http://www.ansys.com

9001: 2015

companies.

(T) 724-746-3304

(F) 724-514-9494

Table of Contents

1. Introduction ............................................................................................................................................ 1

2. Files, Import and Export .......................................................................................................................... 3

2.1. Mapping Data for Fluid-Structure Interaction (FSI) Applications ......................................................... 3

2.2. Enhanced Profile Visualization ........................................................................................................... 3

2.3. Export Results in EnSight DVS Format ................................................................................................ 3

2.3.1. Live Connection to EnSight ...................................................................................................... 4

3. Meshes ................................................................................................................................................... 9

3.1. Smoothing Registers ......................................................................................................................... 9

3.2. Retaining Empty Mesh Interfaces ...................................................................................................... 9

3.3. Using Coupled Walls with the Gap Model .......................................................................................... 9

3.4. Meshing Mode Access ..................................................................................................................... 10

4. Surfaces ................................................................................................................................................. 11

4.1. Ellipsoid Surface ............................................................................................................................. 11

5. Boundary Conditions ............................................................................................................................ 13

5.1. Reference Temperature from a Boundary ......................................................................................... 13

5.2. Wall Roughness Settings for Turbulence Models .............................................................................. 14

5.3. Minimal Pressure Reflection Boundary ............................................................................................ 15

5.4. Retaining Periodic Shadow Zones ................................................................................................... 17

6. Physical Properties ................................................................................................................................ 19

6.1. NIST Real Gas Model ....................................................................................................................... 19

6.1.1. Overview ............................................................................................................................... 19

6.1.2. Enhancements/Limitations ..................................................................................................... 19

6.1.3. Using NIST Real Gas Material Properties .................................................................................. 20

6.2. Real Gas Property (RGP) Table Files .................................................................................................. 22

6.2.1. Creating RGP Files .................................................................................................................. 22

7. Heat Transfer ......................................................................................................................................... 25

7.1. Improving Convergence for Two-Way Thermal Coupling Simulations ............................................... 25

8. Heat Exchangers ................................................................................................................................... 27

8.1. Alternate Formulation for the Dual Cell Heat Exchanger .................................................................. 27

9.Turbulence ............................................................................................................................................. 29

9.1. Estimation of the LES Resolution Quality ......................................................................................... 29

9.2. Combination of SDES/SBES model with (k,ε)-turbulence models ...................................................... 30

9.2.1. Accessing the SDES/SBES model with (k,ε)-turbulence models ................................................ 30

9.2.2. Known Limitations ................................................................................................................. 32

9.3. Near-Wall Treatment for the Porous Media Interface ........................................................................ 32

9.3.1. Accessing the Turbulent Wall Treatment Option ...................................................................... 33

9.3.2. Example ................................................................................................................................. 33

9.4. Explicit Algebraic Reynolds Stress Model ......................................................................................... 37

9.4.1. Accessing the WJ-BSL-EARSM Model ....................................................................................... 39

9.4.2. Applying Scale-Adaptive Simulation (SAS) with WJ-BSL-EARSM ............................................... 40

9.4.3. WJ-BSL-EARSM Variables in Expressions .................................................................................. 41

9.4.4. Blade Flutter Analysis - CFX Profile Support ............................................................................. 41

9.4.4.1. Example CSV Profile ....................................................................................................... 42

9.4.4.2. Reading and Using the Profile ........................................................................................ 42

9.5. References ...................................................................................................................................... 44

10. Combustion ......................................................................................................................................... 47

10.1. Char Burnout Kinetics (CBK) Model ................................................................................................ 47

10.1.1. References ........................................................................................................................... 48

11. Pollutants ........................................................................................................................................... 49

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of ANSYS, Inc. and its subsidiaries and affiliates.

12. Acoustics ............................................................................................................................................. 51

12.1. Runtime Discrete Fourier Transformation ....................................................................................... 51

12.1.1. Using the Runtime Discrete Fourier Transformation Option ................................................... 51

12.1.2. Band Analysis ....................................................................................................................... 52

12.1.3. Postprocessing with Runtime Discrete Fourier Transformation ............................................... 53

12.2. Modal Analysis .............................................................................................................................. 56

12.2.1. Limitations ........................................................................................................................... 56

12.2.2. Modal Analysis Theory .......................................................................................................... 57

12.2.3. Using the Modal Analysis Model ........................................................................................... 58

12.2.4. Setting Model Parameters .................................................................................................... 58

12.2.5. Postprocessing of the Modal Analysis Model ......................................................................... 59

12.2.5.1. References ................................................................................................................... 59

13. Discrete Phase ..................................................................................................................................... 61

13.1. Extended Collision Stencil ............................................................................................................. 61

13.2. Volume Injections ......................................................................................................................... 62

13.3. Discrete Element Method with van der Waals Forces ...................................................................... 62

13.4. DPM Report—Spray Half-Angle ..................................................................................................... 64

13.5. Particle Tracking Within the Eulerian Multiphase Framework .......................................................... 65

13.5.1. Limitations ........................................................................................................................... 65

13.5.2. Using Particle Tracking with the Eulerian Multiphase Model .................................................. 66

13.6. Using the Non-Iterative Time-Advancement (NITA) Solver with the DPM model .............................. 68

13.7. Force transferred to System Coupling from a Wall Boundary ........................................................... 69

13.8. Using High-Resolution Tracking with Ansys Fluent Models ............................................................. 69

13.9. Blocking Effect .............................................................................................................................. 69

13.9.1. Theory ................................................................................................................................. 69

13.9.2. Using the Blocking Effect ...................................................................................................... 70

13.10. DDPM Packing Limit Numerics .................................................................................................... 71

13.11. Modeling Heat Transfer Coefficient ............................................................................................. 71

14. Multiphase Modeling .......................................................................................................................... 75

14.1. Interfacial Viscous Dissipation Method .......................................................................................... 75

14.1.1. Theory ................................................................................................................................. 75

14.1.2. Using the Interfacial Viscous Dissipation Method .................................................................. 76

14.1.3. Postprocessing ..................................................................................................................... 76

14.2. Evaporation-Condensation Binary Mass Transfer Mechanism .......................................................... 77

14.3. Large Eddy Simulation (LES) Model for Eulerian Multiphase ............................................................ 79

14.3.1. Theory ................................................................................................................................. 79

14.3.2. Usage .................................................................................................................................. 81

14.4. Expert Options for the QMOM ....................................................................................................... 82

14.5. Coupling Between the Evaporation-Condensation Model and the Discrete PBM ............................. 83

14.6.The Montoya Lift Coefficient Correction ......................................................................................... 83

14.6.1. Theory ................................................................................................................................. 83

14.6.2. Usage .................................................................................................................................. 84

14.7. Additional Evaporation-Condensation Models ............................................................................... 86

14.7.1. Theory ................................................................................................................................. 86

14.7.1.1. Hertz-Knudsen Model .................................................................................................. 86

14.7.1.2. Interfacial Heat Flux Model .......................................................................................... 88

14.7.2. Usage .................................................................................................................................. 88

14.7.2.1. Setting up Evaporation/Condensation Mass Transfer .................................................... 88

14.7.2.2. Specifying Mass Transfer Limiters ................................................................................. 90

14.7.2.3. Postprocessing Field Variables ...................................................................................... 91

14.8. DDPM Static Pileup Model ............................................................................................................. 92

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Beta Features Manual

15.The Structural Model for Intrinsic Fluid-Structure Interaction (FSI) ................................................... 95

15.1. Porous Structure Modeling ............................................................................................................ 95

15.1.1. Constitutive Equations and Finite Element Discretization ...................................................... 96

15.1.2. Boundary Conditions ............................................................................................................ 96

15.2. Orthotropic Materials .................................................................................................................... 96

15.2.1. Constitutive Equations for Orthotropic Materials ................................................................... 96

15.2.2. Orthotropic Material Properties ............................................................................................ 97

16. Reduced Order Models (ROMs) ......................................................................................................... 101

16.1. Manual Production of ROM Files from Stand-Alone Fluent ............................................................ 101

17. Solver ................................................................................................................................................ 111

17.1. Stabilization Methods for the Density-Based Solver ...................................................................... 111

17.2. Reduced Rank Extrapolation (RRE) Method .................................................................................. 113

17.3. Executing Commands at a User-Specified Iteration or Time Step .................................................. 115

17.3.1. Executing a Command at a Particular Iteration .................................................................... 115

17.3.2. Executing a Command at a Particular Time Step .................................................................. 116

17.4. Modified Momentum-Based Rhie-Chow Flux Type ....................................................................... 116

17.5. Alternative Rhie-Chow Flux With Moving Or Dynamic Meshes ...................................................... 116

17.6. Automatic Solver Defaults Based on Setup ................................................................................... 117

17.7. Roe Flux-Difference Splitting Scheme in the Pressure-Based Solver .............................................. 118

17.7.1. Roe Flux-Difference Splitting Theory ................................................................................... 118

17.7.2. Using the Roe Flux-Difference Splitting Scheme in the Pressure-Based Solver ...................... 119

17.8. Improved Second Order Transient Formulations .......................................................................... 120

17.9. Accelerated Time Marching with the Non-Iterative Solver ............................................................. 120

17.10. Hybrid NITA with Single-Phase Flows ......................................................................................... 121

17.11. Equation Ordering for Multiphase Flows .................................................................................... 122

17.12. Enhanced Poor Mesh Numerics ................................................................................................. 122

17.13. Hybrid Interpolation for Overset Meshes .................................................................................... 123

17.14. Using the Local Pseudo Time Step Method with the Pressure-Based Coupled Solver ................... 123

17.15. References ................................................................................................................................ 125

18. Adaption ........................................................................................................................................... 127

18.1. Predefined Criteria for Boundary Layer Adaption Based on Yplus / Ystar ....................................... 127

18.2. Pressure-Based Predefined Criteria for Aerodynamics ................................................................... 129

19. Graphics, Postprocessing, and Reporting ......................................................................................... 133

19.1. Hide Duplicate Nodes in Mesh Display ......................................................................................... 133

19.2. Display Mesh with Transparency .................................................................................................. 133

19.3. Model Tree Matches Case Settings ............................................................................................... 134

19.4. Make the View Normal to the Selected Surface ............................................................................ 134

19.5. Create Postprocessing Volumes ................................................................................................... 136

19.6. Save Pictures in GLB Format ........................................................................................................ 137

19.7. Moving Average Statistics ........................................................................................................... 138

19.8. Force, Drag, Lift, and Moment Report Definitions Using Reference Frames ..................................... 140

19.9. Postprocessing Unsteady Statistics Using Custom Field Functions ................................................ 142

19.10. Line Integral Convolution Plots (LICs) ......................................................................................... 143

19.10.1. Line Integral Convolutions Dialog Box ............................................................................... 153

19.10.2. Oriented Line Integral Convolutions Dialog Box ................................................................. 161

20. Turbomachinery ................................................................................................................................ 165

20.1. General Turbo Interface with Lip Feature ..................................................................................... 165

21. Parallel Processing ............................................................................................................................ 167