ANSYS CFX-Solver Modeling Guide
Release 12.0ANSYS, Inc. April 2009Southpointe
275 Technology Drive ANSYS, Inc. is
certified to ISO
9001:2008.
Canonsburg, PA 15317
http://www.ansys.com
(T) 724-746-3304
(F) 724-514-9494
Prepare-se para as provas
Estude fácil! Tem muito documento disponível na Docsity
Ganhe pontos para baixar
Ganhe pontos ajudando outros esrudantes ou compre um plano Premium
Guias e Dicas
Prepare-se para as provas
Estude fácil! Tem muito documento disponível na Docsity
Encontrar documentos
Prepare-se para as provas com trabalhos de outros alunos como você, aqui na Docsity
Encontra documentos específicos para os exames da tua universidade
Encontra documentos específicos para os exames da tua universidade
Videoaulas
Prepare-se com as videoaulas e exercícios resolvidos criados a partir da grade da sua Universidade
Quiz
Responda perguntas de provas passadas e avalie sua preparação.
Ganhe pontos para baixar
Ganhe pontos ajudando outros esrudantes ou compre um plano Premium
ANSYS CFX-Solver Modeling Guide 12, Notas de estudo de Engenharia Química
Tutorial do CFX SOLVER versão 12.0
Tipologia: Notas de estudo
Antes de 2010
Em oferta
Oferta por tempo limitado
Compartilhado em 06/09/2010
helder-moura-7 🇧🇷
5
(3)5 documentos
1 / 504
Esta página não é visível na pré-visualização
Não perca as partes importantes!
Em oferta
Documentos relacionados
Pré-visualização parcial do texto
Baixe ANSYS CFX-Solver Modeling Guide 12 e outras Notas de estudo em PDF para Engenharia Química, somente na Docsity!
ANSYS CFX-Solver Modeling Guide
ANSYS, Inc. Release 12. Southpointe April 2009 275 Technology Drive (^) ANSYS, Inc. is certified to ISO 9001:2008.
Canonsburg, PA 15317 [email protected] http://www.ansys.com (T) 724-746- (F) 724-514-
Copyright and Trademark Information
© 2009 ANSYS, Inc. All rights reserved. Unauthorized use, distribution, or duplication is prohibited.
ANSYS, ANSYS Workbench, Ansoft, AUTODYN, EKM, Engineering Knowledge Manager, CFX, FLUENT, HFSS and any and all ANSYS, Inc. brand, product, service and feature names, logos and slogans are registered trademarks or trademarks of ANSYS, Inc. or its subsidiaries in the United States or other countries. ICEM CFD is a trademark used by ANSYS, Inc. under license. CFX is a trademark of Sony Corporation in Japan. All other brand, product, service and feature names or trademarks are the property of their respective owners.
Disclaimer Notice
THIS ANSYS SOFTWARE PRODUCT AND PROGRAM DOCUMENTATION INCLUDE TRADE SECRETS AND ARE
CONFIDENTIAL AND PROPRIETARY PRODUCTS OF ANSYS, INC., ITS SUBSIDIARIES, OR LICENSORS. The software products and documentation are furnished by ANSYS, Inc., its subsidiaries, or affiliates under a software license agreement that contains provisions concerning non-disclosure, copying, length and nature of use, compliance with exporting laws, warranties, disclaimers, limitations of liability, and remedies, and other provisions. The software products and documentation may be used, disclosed, transferred, or copied only in accordance with the terms and conditions of that software license agreement.
ANSYS, Inc. is certified to ISO 9001:2008.
ANSYS UK Ltd. is a UL registered ISO 9001:2000 company.
U.S. Government Rights
For U.S. Government users, except as specifically granted by the ANSYS, Inc. software license agreement, the use, duplication, or disclosure by the United States Government is subject to restrictions stated in the ANSYS, Inc. software license agreement and FAR 12.212 (for non-DOD licenses).
Third-Party Software
See the legal information in the product help files for the complete Legal Notice for ANSYS proprietary software and third-party software. If you are unable to access the Legal Notice, please contact ANSYS, Inc.
Published in the U.S.A.
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
iv Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
v
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
vii
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
viii Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
x Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
xi
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
xiii
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
14.6. Circumferential Partitioning .................................................................................................................... 349
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
xvi Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
ANSYS CFX-Solver Modeling Guide
List of Tables
1.1. Mesh Motion Options ................................................................................................................................. 5 1.2. Non-Newtonian Models ............................................................................................................................ 19 2.1. Supersonic Inlet Settings ........................................................................................................................... 52 3.1. Data-mapping Criteria ............................................................................................................................... 89 4.1. Fraction of laminar flow for a variety of different devices ............................................................................... 103 6.1. Eulerian-Eulerian Multiphase vs. Particle Transport ...................................................................................... 144 7.1. Advantages and Disadvantages of Particle Transport ...................................................................................... 180 7.2. Coefficients for some materials using the Tabakoff Erosion Model ................................................................... 187 13.1. Convergence problems due to local effects ................................................................................................. 341 13.2. Convergence problems due to global effects ............................................................................................... 342
xvii
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Chapter 1. Basic Capabilities Modeling
This chapter describes the basic physical models and some other basic capabilities found in CFX:
- Domains (p. 1)
- Physical Models (p. 2)
- Sources (p. 23)
- Material Properties (p. 28)
- Mixture Properties (Fixed and Variable) (p. 36)
- Efficiency Calculation (p. 36) Additional information on using boundary and initial conditions is available:
- Boundary Condition Modeling (p. 41)
- Initial Condition Modeling (p. 71). Descriptions of more advanced physical models and how the basic models extend to more complex cases are provided in:
- Turbulence and Near-Wall Modeling (p. 97)
- Domain Interface Modeling (p. 123)
- Multiphase Flow Modeling (p. 141)
- Particle Transport Modeling (p. 179)
- Combustion Modeling (p. 225)
- Radiation Modeling (p. 257)
- Real Fluid Properties (p. 269)
- Coupling CFX to an External Solver: ANSYS Multi-field Simulations (p. 295) Additional information is available:
- For general solver and convergence advice, see Advice on Flow Modeling (p. 321).
- For information on parallel processing and its implementation, see Using the Solver in Parallel (p. 345).
- For information on expert parameters, see Expert Control Parameters (p. 363).
- For information on extending the capabilities of CFX through Fortran subroutines, see User Fortran (p. 379).
- For a description of the mathematics used in the implementation of these models, see Basic Solver Capability Theory (p. 1) in the ANSYS CFX-Solver Theory Guide.
Domains
Regions of fluid flow and/or heat transfer in CFX are called domains. Fluid domains define a region of fluid flow, while solid domains are regions occupied by conducting solids in which volumetric sources of energy can be specified. The domain requires three specifications:
- The region defining the flow or conducting solid. A domain is formed from one or more 3D primitives that constrain the region occupied by the fluid and/or conducting solids. For details, see Mesh Topology in CFX-Pre (p. 69) in the ANSYS CFX-Pre User's Guide.
- The physical nature of the flow. This determines the modeling of specific features such as heat transfer or buoyancy.
- The properties of the materials in the region. There can be many domains per model, with each domain defined by separate 3D primitives. Multidomain problems may be created from a single mesh if it contains multiple 3D primitives or is from multiple meshes. For details, see Importing and Transforming Meshes (p. 49) in the ANSYS CFX-Pre User's Guide.
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Physical Models
When you set up a simulation, you must select which physical models to include. The physical models define the type of simulation you want to perform. Currently in CFX, the following models are available:
- Steady State and Transient Flows (p. 2)
- Mesh Deformation (p. 3)
- Laminar Flow (p. 6)
- Turbulence and Turbulence Models (p. 6)
- Heat Transfer (p. 7)
- Conjugate Heat Transfer (p. 7)
- Compressible Flow (p. 7)
- Setting a Reference Pressure (p. 8)
- Buoyancy (p. 9)
- Multicomponent Flow (p. 12)
- Equilibrium Phase Change Model (p. 276)
- Additional Variables (p. 16)
- Non-Newtonian Flow (p. 18)
- Coordinate Frames (p. 21)
- Sources (p. 23) In addition to these models, you can also introduce volumetric sources of mass, momentum energy, resistance, and Additional Variables using fluid subdomains. Point sources can also be applied to a single control volume. For details, see Point Sources (p. 23). Descriptions of more advanced physical models and how the basic models extend to more complex cases are provided in:
- Turbulence and Near-Wall Modeling (p. 97)
- Domain Interface Modeling (p. 123)
- Multiphase Flow Modeling (p. 141)
- Particle Transport Modeling (p. 179)
- Combustion Modeling (p. 225)
- Radiation Modeling (p. 257)
- Real Fluid Properties (p. 269)
- Coupling CFX to an External Solver: ANSYS Multi-field Simulations (p. 295)
Steady State and Transient Flows
The time dependence of the flow characteristics can be specified as either steady state or transient. Steady state simulations, by definition, are those whose characteristics do not change with time and whose steady conditions are assumed to have been reached after a relatively long time interval. They therefore require no real time information to describe them. Many practical flows can be assumed to be steady after initial unsteady flow development, for example, after the start up of a rotating machine. Transient simulations require real time information to determine the time intervals at which the CFX-Solver calculates the flow field. Transient behavior can be caused by the initially changing boundary conditions of the flow, as in start up, or it can be inherently related to the flow characteristics, so that a steady state condition is never reached, even when all other aspects of the flow conditions are unchanging. Many flows, particularly those driven by buoyancy, do not have a steady state solution, and may exhibit cyclic behavior. Sometimes simulations that are run in steady state mode will have difficulty converging, and no matter what action you take regarding mesh quality and timestep size, the solution does not converge. This could be an indication of
Release 12.0 - © 2009 ANSYS, Inc. All rights reserved.
2 Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Physical Models