ANSYS FLUENT Getting Start Guide

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Getting start guide for Fluent 12.0

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  • ANSYS FLUENT 12.0

    Getting Started Guide

    April 2009

  • Copyright c 2009 by ANSYS, Inc.All Rights Reserved. No part of this document may be reproduced or otherwise used in

    any form without express written permission from ANSYS, Inc.

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    Portions of this program include material copyrighted by PathScale Corporation2003-2004.

    ANSYS, Inc. is certified to ISO 9001:2008

    See the on-line documentation for the complete Legal Notices for ANSYS proprietarysoftware and third-party software. If you are unable to access the Legal Notice, contact

    ANSYS, Inc.

  • Contents

    Preface 1

    1 Introduction to ANSYS FLUENT 1-1

    1.1 Program Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

    1.2 ANSYS FLUENT Documentation . . . . . . . . . . . . . . . . . . . . . . 1-4

    1.2.1 Accessing the ANSYS FLUENT Documentation . . . . . . . . . . 1-4

    1.2.2 Using the PDF Documentation . . . . . . . . . . . . . . . . . . . 1-5

    1.2.3 Using the HTML Documentation . . . . . . . . . . . . . . . . . . 1-7

    2 Basic Steps for CFD Analysis using ANSYS FLUENT 2-1

    2.1 Steps in Solving Your CFD Problem . . . . . . . . . . . . . . . . . . . . 2-1

    2.2 Planning Your CFD Analysis . . . . . . . . . . . . . . . . . . . . . . . . 2-2

    3 Guide to a Successful Simulation Using ANSYS FLUENT 3-1

    A Glossary of Terms A-1

    A.1 Summary of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

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  • Preface

    The Contents of This Manual

    The ANSYS FLUENT Getting Started Guide highlights some of the features in ANSYSFLUENT and how to get started using the software.

    The Contents of the Other Manuals

    In addition to this Getting Started Guide, there are several other manuals available tohelp you use ANSYS FLUENT and its associated programs:

    The Users Guide contains detailed information about how to use ANSYS FLUENT,including information about the user interface, reading and writing files, definingboundary conditions, setting up physical models, calculating a solution, and ana-lyzing your results.

    The Theory Guide contains reference information for how the physical models areimplemented in ANSYS FLUENT.

    The Tutorial Guide contains a number of example problems with detailed instruc-tions, commentary, and postprocessing of results.

    The UDF Manual contains information about writing and using user-defined func-tions (UDFs).

    The Text Command List provides a brief description of each of the commands inANSYS FLUENTs text interface.

    The following addon module manuals offer additional applications within ANSYSFLUENT:

    Continuous Fiber Module Manual

    Fuel Cell Modules Manual

    Magnetohydrodynamics (MHD) Module Manual

    Population Balance Module Manual

    Typographical Conventions

    An informational icon ( i ) marks an important note.

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  • Preface

    Technical Support

    If you encounter difficulties while using ANSYS FLUENT, please first refer to the section(s)of the manuals containing information on the commands you are trying to use or thetype of problem you are trying to solve. The product documentation is available fromthe online help, or from the User Services Center.

    If you encounter an error, please write down the exact error message that appeared andnote as much information as you can about what you were doing in ANSYS FLUENT.Then refer to the following resources available on the User Services Center:

    Installation and System FAQsa link is available from the main page on the UserServices Center. The FAQs can be searched by word or phrase, and are availablefor general installation questions as well as for product questions.

    Known Defects for ANSYS FLUENTa link is available from the product page.The defects can be searched by word or phrase, and are listed by categories.

    Online Technical Supporta link is available from the main page on the UserServices Center. From the Online Technical Support Portal page, there is a link tothe Search Solutions & Request Support page, where the solutions can be searchedby word or phrase and where you have the ability to enter a technical supportrequest.

    Contacting Technical Support

    If none of the resources available on the User Services Center help in resolving the prob-lem, or you have complex modeling projects, we invite you to log a technical supportrequest (www.fluentusers.com) to obtain further assistance. However, there are a fewthings that we encourage you to do before logging a request:

    Note what you are trying to accomplish with ANSYS FLUENT. Note what you were doing when the problem or error occurred. Save a journal or transcript file of the ANSYS FLUENT session in which the problemoccurred. This is the best source that we can use to reproduce the problem andthereby help to identify the cause.

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  • Chapter 1. Introduction to ANSYS FLUENT

    ANSYS FLUENT is a state-of-the-art computer program for modeling fluid flow, heattransfer, and chemical reactions in complex geometries.

    ANSYS FLUENT is written in the C computer language and makes full use of the flexibil-ity and power offered by the language. Consequently, true dynamic memory allocation,efficient data structures, and flexible solver control are all possible. In addition, ANSYSFLUENT uses a client/server architecture, which allows it to run as separate simultaneousprocesses on client desktop workstations and powerful compute servers. This architec-ture allows for efficient execution, interactive control, and complete flexibility betweendifferent types of machines or operating systems.

    ANSYS FLUENT provides complete mesh flexibility, including the ability to solve yourflow problems using unstructured meshes that can be generated about complex geome-tries with relative ease. Supported mesh types include 2D triangular/quadrilateral, 3Dtetrahedral/hexahedral/pyramid/wedge/polyhedral, and mixed (hybrid) meshes. ANSYSFLUENT also allows you to refine or coarsen your mesh based on the flow solution.

    After a mesh has been read into ANSYS FLUENT, all remaining operations are performedwithin ANSYS FLUENT. These include setting boundary conditions, defining fluid prop-erties, executing the solution, refining the mesh, and postprocessing and viewing theresults.

    The ANSYS FLUENT serial solver manages file input and output, data storage, and flowfield calculations using a single solver process on a single computer. ANSYS FLUENTalso uses a utility called cortex that manages ANSYS FLUENTs user interface and basicgraphical functions. ANSYS FLUENTs parallel solver allows you to compute a solutionusing multiple processes that may be executing on the same computer, or on differentcomputers in a network.

    Parallel processing in ANSYS FLUENT involves an interaction between ANSYS FLUENT,a host process, and a set of compute-node processes. ANSYS FLUENT interacts with thehost process and the collection of compute nodes using the cortex user interface utility.

    Figures 1.0.1 and 1.0.2 illustrate the serial and parallel ANSYS FLUENT architectures.

    For more information about ANSYS FLUENTs parallel processing capabilities, pleaserefer to the Users Guide.

    All functions required to compute a solution and display the results are accessible inANSYS FLUENT through an interactive interface.

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  • Introduction to ANSYS FLUENT

    FaceNode

    Data:Cell

    CORTEX

    DiskFile Input/OutputSolver

    Figure 1.0.1: Serial ANSYS FLUENT Architecture

    FaceNode

    Data:Cell

    FaceNode

    Data:Cell

    FaceNode

    Data:Cell

    FaceNode

    Data:Cell

    MPIFLUENT

    MPIFLUENT

    MPIFLUENT

    MPIFLUENT

    MPIFLUENT

    Socket

    CORTEX

    HOST Disk

    Compute Node 0

    Compute Node 2

    Compute Node 1

    Compute Node 3

    File Input/Output

    COMPUTE NODES

    MP

    Parallel Data FileInput/Output

    Figure 1.0.2: Parallel ANSYS FLUENT Architecture

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  • 1.1 Program Capabilities

    1.1 Program Capabilities

    The ANSYS FLUENT solver has the following modeling capabilities:

    2D planar, 2D axisymmetric, 2D axisymmetric with swirl (rotationally symmetric),and 3D flows

    Quadrilateral, triangular, hexahedral (brick), tetrahedral, prism (wedge), pyramid,polyhedral, and mixed element meshes

    Steady-state or transient flows Incompressible or compressible flows, including all speed regimes (low subsonic,transonic, supersonic, and hypersonic flows)

    Inviscid, laminar, and turbulent flows Newtonian or non-Newtonian flows Ideal or real gases Heat transfer, including forced, natural, and mixed convection, conjugate (solid/fluid)heat transfer, and radiation

    Chemical species mixing and reaction, including homogeneous and heterogeneouscombustion models and surfa