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Ansys 18.1 CFX-Solver Modeling Guide 手册
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ANSYS 18.1 ,CFX-Solver Modeling Guide,CFX-Solver指导手册,英文版。
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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
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9001: 2008
companies.
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ENTIAL AND PROPRIETARY PRODUCTS OF ANSYS, INC., ITS SUBSIDIARIES, OR LICENSORS. The software products
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Published in the U.S.A.
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
Release 18.1 - © ANSYS, Inc. All rights reserved. - Contains proprietary and confidential information
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
Release 18.1 - © ANSYS, Inc. All rights reserved. - Contains proprietary and confidential information
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
v
Release 18.1 - © ANSYS, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
Modeling Guide
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