Ansys18.1CFX-SolverModelingGuide手册_CFX-SolverModelingGuide

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ANSYS CFX-Solver Modeling Guide

Release 18.1ANSYS, Inc.

April 2017Southpointe

2600 ANSYS Drive

Canonsburg, PA 15317

ANSYS, Inc. and

ANSYS Europe,

ansysinfo@ansys.com

Ltd. are UL

http://www.ansys.com

registered ISO

(T) 724-746-3304

(F) 724-514-9494

9001: 2008

companies.

Table of Contents

1. Basic Capabilities Modeling .................................................................................................................... 1

1.1. Domains ........................................................................................................................................... 2

1.2. Physical Models ................................................................................................................................ 2

1.2.1. Steady State and Transient Flows .............................................................................................. 3

1.2.2. Mesh Deformation ................................................................................................................... 4

1.2.2.1. None ............................................................................................................................... 4

1.2.2.2. Regions of Motion Specified ............................................................................................ 4

1.2.2.2.1. Displacement Relative To ........................................................................................ 4

1.2.2.2.2. Mesh Stiffness ......................................................................................................... 5

1.2.2.2.2.1. Increase Near Small Volumes .......................................................................... 5

1.2.2.2.2.2. Increase Near Boundaries ............................................................................... 6

1.2.2.2.2.3. Blended Distance and Small Volumes ............................................................. 6

1.2.2.2.2.4.Value (Specified Stiffness) ............................................................................... 7

1.2.2.2.3. Mesh Motion Options ............................................................................................. 7

1.2.2.2.3.1. Conservative Interface Flux ............................................................................. 8

1.2.2.2.3.2. Unspecified .................................................................................................... 9

1.2.2.2.3.3. Stationary ...................................................................................................... 9

1.2.2.2.3.4. Specified Displacement .................................................................................. 9

1.2.2.2.3.5. Specified Location .......................................................................................... 9

1.2.2.2.3.6. Periodic Displacement .................................................................................. 10

1.2.2.2.3.7. Parallel to Boundary ..................................................................................... 11

1.2.2.2.3.8. Surface of Revolution ................................................................................... 11

1.2.2.2.3.9. System Coupling .......................................................................................... 12

1.2.2.2.3.10. ANSYS MultiField ........................................................................................ 12

1.2.2.2.3.11. Rigid Body Solution .................................................................................... 12

1.2.2.3. Periodic Regions of Motion ............................................................................................ 13

1.2.2.3.1. Periodic Regions of Motion: Complex Displacement ............................................... 14

1.2.2.3.1.1. Boundary conditions .................................................................................... 14

1.2.2.3.1.2. Complex Displacement Solution ................................................................... 14

1.2.2.4. Junction Box Routine ..................................................................................................... 15

1.2.3. Laminar Flow ......................................................................................................................... 15

1.2.4.Turbulence and Turbulence Models ........................................................................................ 15

1.2.5. Heat Transfer .......................................................................................................................... 15

1.2.5.1. None ............................................................................................................................. 16

1.2.5.2. Isothermal ..................................................................................................................... 16

1.2.5.3. Thermal Energy ............................................................................................................. 16

1.2.5.4. Total Energy .................................................................................................................. 16

1.2.5.5.Turbulent Flux Closure ................................................................................................... 16

1.2.6. Conjugate Heat Transfer ......................................................................................................... 17

1.2.7. Compressible Flow ................................................................................................................. 17

1.2.7.1. Mixed Subsonic/Supersonic Boundaries ......................................................................... 17

1.2.8. Setting a Reference Pressure ................................................................................................... 18

1.2.9. Buoyancy ............................................................................................................................... 18

1.2.9.1. Full Buoyancy Model (Density Difference) ...................................................................... 19

1.2.9.2. Boussinesq Model ......................................................................................................... 20

1.2.9.3. Buoyancy and Pressure .................................................................................................. 20

1.2.9.4. Buoyancy In Rotating Domains ...................................................................................... 21

1.2.10. Immersed Solids ................................................................................................................... 21

1.2.10.1. Immersed Boundary Tracking ....................................................................................... 22

1.2.10.2. Limitations to using Immersed Solids ........................................................................... 23

iii

of ANSYS, Inc. and its subsidiaries and affiliates.

1.2.11. Multicomponent Flow .......................................................................................................... 24

1.2.11.1. Assumptions About Multicomponent Flow .................................................................. 24

1.2.11.2. Multicomponent Flow Terminology .............................................................................. 25

1.2.11.2.1. Pure Substance ................................................................................................... 25

1.2.11.2.2. Component ........................................................................................................ 25

1.2.11.2.3. Multicomponent Fluid ........................................................................................ 25

1.2.11.2.4. Fluid ................................................................................................................... 25

1.2.11.2.5. Additional Variable .............................................................................................. 25

1.2.11.2.6. Ideal Mixture ....................................................................................................... 26

1.2.11.2.7.Transport Equation .............................................................................................. 26

1.2.11.2.8. Constraint Equation ............................................................................................ 26

1.2.11.2.9. Algebraic Equation .............................................................................................. 26

1.2.11.3. Multicomponent Flow Examples .................................................................................. 26

1.2.11.3.1. Example 1: Multicomponent Multiphase .............................................................. 26

1.2.11.3.2. Example 2: Smoke in Air ...................................................................................... 27

1.2.11.4. Component Domain Settings ....................................................................................... 27

1.2.11.4.1. Algebraic Slip ...................................................................................................... 28

1.2.11.4.2. Kinematic Diffusivity ........................................................................................... 28

1.2.11.4.3.Turbulent Flux Closure ......................................................................................... 28

1.2.11.5. Boundary Conditions ................................................................................................... 29

1.2.11.6. Multicomponent Energy Diffusion ............................................................................... 29

1.2.12. Additional Variables .............................................................................................................. 30

1.2.12.1. Kinematic Diffusivity .................................................................................................... 30

1.2.12.2.Turbulent Flux Closure ................................................................................................. 31

1.2.12.3.Volumetric and Specific Additional Variable .................................................................. 31

1.2.12.4. Additional Variables In Units Other Than Mass .............................................................. 32

1.2.12.5. Unspecified Additional Variables .................................................................................. 32

1.2.12.6. Tensor Type ................................................................................................................. 32

1.2.13. Non-Newtonian Flow ........................................................................................................... 32

1.2.14. Coordinate Frames ............................................................................................................... 35

1.2.14.1. Global Coordinate Frame (Coord 0) .............................................................................. 35

1.2.14.2. Local Coordinate Frames .............................................................................................. 36

1.2.14.3. Cartesian Coordinate Frames ....................................................................................... 37

1.2.15. Rotating Frames of Reference (RFR) ....................................................................................... 37

1.2.15.1. Alternate Rotation Model ............................................................................................. 37

1.2.16. Electric Field ......................................................................................................................... 38

1.3. Sources .......................................................................................................................................... 39

1.3.1. Locators for Sources ............................................................................................................... 39

1.3.1.1. Subdomains .................................................................................................................. 39

1.3.1.2. Boundary Sources ......................................................................................................... 40

1.3.1.3. Point Sources ................................................................................................................ 40

1.3.2.Types of Sources ..................................................................................................................... 40

1.3.2.1. General Sources ............................................................................................................ 40

1.3.2.1.1. Source Coefficient / Total Source Coefficient .......................................................... 40

1.3.2.2. Momentum Sources ...................................................................................................... 41

1.3.2.2.1. Isotropic and Directional Loss Models .................................................................... 41

1.3.2.2.2. General Momentum Source .................................................................................. 42

1.3.2.2.2.1. Postprocessing the Momentum Sources ....................................................... 43

1.3.2.2.3. Immersed Solids Sources ....................................................................................... 43

1.3.2.3. Mass (Continuity) Sources .............................................................................................. 43

1.3.2.3.1. Mass (Continuity) Source Coefficients .................................................................... 44

1.3.2.4. Bulk Sources .................................................................................................................. 45

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

Modeling Guide

1.3.2.5. Solid Sources ................................................................................................................. 45

1.3.2.6. Radiation Sources .......................................................................................................... 45

1.3.2.7. Particle User Sources ..................................................................................................... 45

1.3.3. Multiplying Sources by Porosity .............................................................................................. 45

1.4. Material Properties .......................................................................................................................... 45

1.4.1. CEL Expressions ..................................................................................................................... 46

1.4.2. Coordinate Frame .................................................................................................................. 46

1.4.3. Equation of State .................................................................................................................... 46

1.4.3.1. Option .......................................................................................................................... 46

1.4.3.1.1. Value .................................................................................................................... 46

1.4.3.1.2. Ideal Gas ............................................................................................................... 47

1.4.3.1.3. Real Gas ................................................................................................................ 47

1.4.3.1.4. IAPWS Library ....................................................................................................... 47

1.4.3.2. Molar Mass .................................................................................................................... 48

1.4.4. Specific Heat Capacity ............................................................................................................ 48

1.4.4.1.Value ............................................................................................................................. 48

1.4.4.2. NASA Format ................................................................................................................. 48

1.4.4.3. Zero Pressure Polynomial ............................................................................................... 49

1.4.4.4. Real Gas ........................................................................................................................ 50

1.4.4.5. Reference State Properties ............................................................................................. 50

1.4.4.5.1. Reference Temperature and Reference Pressure ..................................................... 50

1.4.4.5.2. Reference Specific Enthalpy and Entropy ............................................................... 50

1.4.5. Density and Specific Heat Dependencies ................................................................................ 50

1.4.6.Table Generation Pressure and Temperature Limits ................................................................. 51

1.4.7.Transport Properties ............................................................................................................... 51

1.4.7.1. Dynamic Viscosity .......................................................................................................... 51

1.4.7.1.1. Value .................................................................................................................... 51

1.4.7.1.2. Rigid Non Interacting Sphere and Interacting Sphere Models ................................. 51

1.4.7.1.3. Non-Newtonian Model .......................................................................................... 52

1.4.7.1.4. Ideal Mixture ........................................................................................................ 52

1.4.7.1.5. Sutherland’s Formula ............................................................................................ 52

1.4.7.2. Thermal Conductivity .................................................................................................... 53

1.4.7.2.1. Sutherland’s Formula ............................................................................................ 53

1.4.7.2.2. Modified Euken Model .......................................................................................... 53

1.4.8. Radiation Properties ............................................................................................................... 53

1.4.9. Buoyancy Properties .............................................................................................................. 54

1.4.9.1.Thermal Expansivity ....................................................................................................... 54

1.4.10. Electromagnetic Properties .................................................................................................. 54

1.4.10.1. Electrical Conductivity ................................................................................................. 54

1.4.10.2. Magnetic Permeability ................................................................................................. 54

1.4.11. Library Materials ................................................................................................................... 55

1.4.11.1. Adding to the MATERIALS file ....................................................................................... 55

1.5. Mixture Properties (Fixed,Variable, Reacting) ................................................................................... 56

1.5.1. Equation of State/Density ....................................................................................................... 56

1.5.2. Molar Mass ............................................................................................................................. 58

1.5.3. Specific Heat Capacity ............................................................................................................ 58

1.5.4. Electromagnetic Properties .................................................................................................... 58

1.6. Efficiency Calculation ...................................................................................................................... 59

1.6.1. Isentropic Efficiency and Total Enthalpy .................................................................................. 59

1.6.2. Polytropic Efficiency ............................................................................................................... 60

1.6.3. Activating Efficiency Output ................................................................................................... 62

1.6.3.1. CFX-Solver Manager Output Variables ............................................................................ 62

of ANSYS, Inc. and its subsidiaries and affiliates.

Modeling Guide

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