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Date Received: January 2006 Award Number: 2002-IJ-CX-0019 This report has not been published by the U S Department of Justice To provide better customer service, NCJRS has made this Federally-funded grant final report available electronically in addition to traditional paper copies Opinions or points of view expressed are those
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2006 Texte adopté par la Commission du droit international à sa cinquante-huitième session, en 2006, et soumis à l’Assemblée générale dans le cadre de son rapport sur les travaux de ladite session (A/61/10) Le rapport, qui contient également des commentaires sur le projet d’articles, sera reproduit dans l’Annuaire de la Commission
FLUENT 63 Getting Started Guide - univ-reimsfr
c Fluent Inc October 12, 2006 2-1 Introduction to FLUENT Figure 2 1 1 shows the organizational structure of these components GAMBIT - 2D/3D mesh generation
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[PDF] 2006-03 Gemeindebrief A5.pub - Kirchenkreis Plön
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FLUENT 6.3Getting Started GuideSeptember 2006
Copyrightc
2006 by Fluent Inc.
All Rights Reserved. No part of this document may be reproduced or otherwise used inany form without express written permission from Fluent Inc.Airpak,FIDAP,FLUENT,FLUENT for CATIA V5,FloWizard,GAMBIT,Icemax,Icepak,
Icepro,Icewave,Icechip,MixSim, andPOLYFLOWare registered trademarks of FluentInc. All other products or name brands are trademarks of their respective holders.CHEMKIN is a registered trademark of Reaction Design Inc.Portions of this program include material copyrighted by PathScale Corporation
2003-2004.Fluent Inc.
Centerra Resource Park
10 Cavendish Court
Lebanon, NH 03766
ContentsPreface11 Introduction to Fluent Inc.1-12 Introduction toFLUENT2-12.1 Program Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12.2 Program Capabilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-42.3FLUENTDocumentation. . . . . . . . . . . . . . . . . . . . . . . . . . .2-52.3.1 Accessing theFLUENTDocumentation. . . . . . . . . . . . . .2-62.3.2 Using the PDF Documentation. . . . . . . . . . . . . . . . . . .2-82.3.3 Using the HTML Documentation. . . . . . . . . . . . . . . . . .2-93 Basic Steps for CFD Analysis usingFLUENT3-13.1 Steps in Solving Your CFD Problem. . . . . . . . . . . . . . . . . . . .3-13.2 Planning Your CFD Analysis. . . . . . . . . . . . . . . . . . . . . . . .3-24 Guide to a Successful Simulation UsingFLUENT4-15 The User Interface5-15.1 GUI Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15.2 Console. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-25.2.1 Terminal Emulator. . . . . . . . . . . . . . . . . . . . . . . . . .5-25.2.2 Menu Bar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-35.3 Dialog Boxes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-35.4 Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-85.5 Graphics Display Windows. . . . . . . . . . . . . . . . . . . . . . . . .5-10c
Fluent Inc. October 12, 2006TOC-1
A Glossary of TermsA-1A.1 Summary of Terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1
PrefaceThe Contents of This Manual
TheFLUENTGetting Started Guide gives you a basic overview of Fluent Inc., as well as highlights of the features ofFLUENTand how to get started using it.The Contents of the Other Manuals
In addition to this Getting Started Guide, there are several other manuals available tohelp you useFLUENTand its associated programs:The User's Guide contains detailed information about how to useFLUENT, in-
cluding information about the user interface, reading and writing les, dening boundary conditions, setting up physical models, calculating a solution, and ana- lyzing your results.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-dened func-
tions (UDFs).The Text Command List provides a brief description of each of the commands in FLUENT's text interface.TheGAMBITmanuals teach you how to use theGAMBITpreprocessor for geometry creation and mesh generation.Typographical Conventions
An informational icon (i) marks an important note.Technical Support
If you encounter diculties while usingFLUENT, please rst refer to the section(s) of the manuals containing information on the commands you are trying to use or the type of problem you are trying to solve. The product documentation is available from the online help, on the documentation CD, or from the Fluent Inc. User Services Center (www.fluentusers.com).cFluent Inc. October 12, 20061
PrefaceIf you encounter an error, please write down the exact error message that appeared and note as much information as you can about what you were doing inFLUENT. Then refer to the following resources available on the Fluent Inc. User Services Cen-ter (www.fluentusers.com):Installation and System FAQs|a link is available from the main page on the User
Services Center. The FAQs can be searched by word or phrase, and are availablefor general installation questions as well as for product questions.Known Defects forFLUENT|a link is available from the product page. The defects
can be searched by word or phrase, and are listed by categories.Online Technical Support|a link is available from the main page on the User
Services Center. From the Online Technical Support Portal page, there is a link to the Search Solutions & Request Support page, where the solutions can be searched by word or phrase and where you have the ability to enter a Change Request. The User Services Center also provides online forums, where you can discuss topics of mutual interest and share ideas and information with other Fluent users, and provides the ability to sign up for e-mail notications on our latest product releases.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 call your support engineerfor assistance. However, there are a few things that we encourage you to do before calling:Note what you are trying to accomplish withFLUENT.Note what you were doing when the problem or error occurred.Save a journal or transcript le of theFLUENTsession in which the problem oc-
curred. This is the best source that we can use to reproduce the problem and thereby help to identify the cause.2cFluent Inc. October 12, 2006
Chapter 1. Introduction to Fluent Inc.Fluent is the world's largest provider of commercial computational
uid dynamics (CFD) software and services. Fluent oers general-purpose CFD software for a wide range of in- dustrial applications, along with highly automated, specically focused packages. Fluent also oers CFD consulting services to customers worldwide. The sta at Fluent con- sists mostly of individuals with highly technical backgrounds as applied CFD engineers. In addition, Fluent employs experts in computational methods, mesh generation, and software development. Fluent's clients are the market leaders and the largest companies in industries such as automotive, aerospace, chemical and materials processing, power generation, biomedical,HVAC, and electronics.
Fluent is committed to furthering the body of knowledge on CFD, and to improving the eectiveness of computer modeling as a design and analysis tool in general. We invest in both internal research and development, and participate in collaborations with leading academic establishments, governments, and industry groups. We continue to explore and implement strategic alliances with both hardware and software providers to achieve greater synergy and eciency for our customers. Fluent's mission has been clear from the beginning: to work closely with customers to understand their uid- ow challenges, to provide both software and services tailored to their needs, and to continually measure our success as a function of theirs. As a result of our continuing eorts to fulll our mission, we have enjoyed outstanding user loyalty throughout our history.cFluent Inc. October 12, 20061-1
Introduction to Fluent Inc.1-2c
Fluent Inc. October 12, 2006
Chapter 2. Introduction toFLUENTFLUENTis a state-of-the-art computer program for modeling uid ow and heat trans- fer in complex geometries.FLUENTprovides complete mesh exibility, including the ability to solve your ow problems using unstructured meshes that can be generated about complex geometries with relative ease. Supported mesh types include 2D trian- gular/quadrilateral, 3D tetrahedral/hexahedral/pyramid/wedge/polyhedral, and mixed (hybrid) meshes.FLUENTalso allows you to rene or coarsen your grid based on the ow solution. FLUENTis written in the C computer language and makes full use of the exibility and power oered by the language. Consequently, true dynamic memory allocation, ecient data structures, and exible solver control are all possible. In addition,FLUENTuses a client/server architecture, which allows it to run as separate simultaneous processes on client desktop workstations and powerful compute servers. This architecture allows for ecient execution, interactive control, and complete exibility between dierent types of machines or operating systems. All functions required to compute a solution and display the results are accessible in FLUENTthrough an interactive, menu-driven interface.2.1 Program Structure
YourFLUENTpackage includes the following products:FLUENT, the solver.GAMBIT, the preprocessor for geometry modeling and mesh generation.TGrid, an additional preprocessor that can generate volume meshes from existing
boundary meshes.Filters (translators) for import of surface and volume meshes from CAD/CAE packages such asANSYS,CGNS,I-deas,NASTRAN,PATRAN, and others.cFluent Inc. October 12, 20062-1
Introduction toFLUENTFigure2.1.1shows the organizational structure of these components.GAMBIT - 2D/3D mesh generation - geometry setup - mesh import and adaption - physical models - boundary conditions - material properties - calculation - postprocessingFLUENT - 2D triangular mesh - 3D tetrahedral mesh - 2D or 3D hybrid meshTGRIDBoundaryMeshBoundary and/or
Volume MeshGeometry
or MeshOther CAD/CAE Packages
2D/3D Mesh
MeshMeshFigure 2.1.1: Basic Program Structure
iNote that a \grid" is the same thing as a \mesh"; the two words are used interchangeably throughout the documentation. You can create your geometry and mesh usingGAMBIT. See theGAMBITdocumentation for details. You can also useTGridto generate a triangular, tetrahedral, or hybrid volume mesh from an existing boundary mesh (created byGAMBITor a third-party CAD/CAE package). See theTGridUser's Guide for details. It is also possible to create meshes forFLUENTusingANSYS,CGNS(CFD general notation system),I-deas (SDRC),MSC/ARIES,MSC/PATRAN, orMSC/NASTRAN. Interfaces to other CAD/CAE packages may be made available in the future, based on customer requirements, but most CAD/CAE packages can export meshes in one of the above formats. Once a mesh has been read intoFLUENT, all remaining operations are performed within FLUENT. These include setting boundary conditions, dening uid properties, executing the solution, rening the mesh, and viewing and postprocessing the results.2-2cFluent Inc. October 12, 2006
2.1 Program StructureTheFLUENTserial solver manages le input and output, data storage, and
ow eld calculations using a single solver process on a single computer.FLUENTalso uses a utility calledcortexthat managesFLUENT's user interface and basic graphical functions. FLUENT's parallel solver allows you to compute a solution using multiple processes that may be executing on the same computer, or on dierent computers in a network. Parallel processing inFLUENTinvolves an interaction betweenFLUENT, a host process, and a set of compute-node processes.FLUENTinteracts with the host process and the collection of compute nodes using thecortexuser interface utility.Figures2.1.2and2.1.3illustrate the serial and parallelFLUENTarchitectures.SolverCORTEXData:CellFaceNodeFile Input/OutputDiskFigure 2.1.2: SerialFLUENTArchitectureCompute Node 0SocketHOSTCORTEXCOMPUTE NODESCompute Node 2Compute Node 3Compute Node 1File Input/OutputDiskData:CellFaceNodeFLUENTMPIFLUENTMPIFLUENTMPIFLUENTMPIData:CellFaceNodeData:CellFaceNodeData:CellFaceNodeMPFLUENTMPIFigure 2.1.3: ParallelFLUENTArchitectureFor more information aboutFLUENT's parallel processing capabilities, please refer to the
User's Guide.c
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Introduction toFLUENT2.2 Program Capabilities
TheFLUENTsolver has the following modeling capabilities:2D planar, 2D axisymmetric, 2D axisymmetric with swirl (rotationally symmetric),
and 3D owsQuadrilateral, triangular, hexahedral (brick), tetrahedral, prism (wedge), pyramid, polyhedral, and mixed element meshesSteady-state or transient owsIncompressible or compressible ows, including all speed regimes (low subsonic, transonic, supersonic, and hypersonic ows)Inviscid, laminar, and turbulent owsNewtonian or non-Newtonian owsHeat transfer, including forced, natural, and mixed convection, conjugate (solid/ uid)heat transfer, and radiationChemical species mixing and reaction, including homogeneous and heterogeneous
combustion models and surface deposition/reaction modelsFree surface and multiphase models for gas-liquid, gas-solid, and liquid-solid
owsLagrangian trajectory calculation for dispersed phase (particles/droplets/bubbles),including coupling with continuous phase and spray modelingCavitation modelPhase change model for melting/solidication applicationsPorous media with non-isotropic permeability, inertial resistance, solid heat con-
duction, and porous-face pressure jump conditionsLumped parameter models for fans, pumps, radiators, and heat exchangersAcoustic models for predicting
ow-induced noiseInertial (stationary) or non-inertial (rotating or accelerating) reference framesMultiple reference frame (MRF) and sliding mesh options for modeling multiple
moving framesMixing-plane model for modeling rotor-stator interactions, torque converters, and similar turbomachinery applications with options for mass conservation and swirl conservation2-4cFluent Inc. October 12, 2006
2.3FLUENTDocumentationDynamic mesh model for modeling domains with moving and deforming meshVolumetric sources of mass, momentum, heat, and chemical speciesMaterial property databaseExtensive customization capability via user-dened functionsDynamic (two-way) coupling with GT-Power and WAVEMagnetohydrodynamics (MHD) module (documented separately)Continuous ber module (documented separately)Fuel cell modules (documented separately)Population balance module (documented separately)
FLUENTis ideally suited for incompressible and compressible uid- ow simulations in complex geometries.FLUENT's parallel solver allows you to compute solutions for cases with very large meshes on multiple processors, either on the same computer or on dierent computers in a network. Fluent Inc. also oers other solvers that address dierent ow regimes and incorporate alternative physical models. Additional CFD programs from Fluent Inc. includeAirpak,FIDAP,FloWizard,Icepak,MixSim, andPOLYFLOW.2.3FLUENTDocumentation
FLUENT's integrated help system gives you access to theFLUENTdocumentation through HTML les, which can be viewed with your standard web browser (e.g., Netscape, Mozilla, or Internet Explorer). For printing, Adobe Acrobat PDF versions of the manu- als are also provided. This section describes how to access theFLUENTdocumentation outside ofFLUENT(i.e., not through theFLUENTon-line help utility). See the User's Guide for information about accessing the documentation throughFLUENT. To view the documentation, you can use either the HTML or the PDF les, either in the installation area or on the documentation CD. You will also need a web browser. If you do not have one, contact your Fluent support engineer and ask for the Netscape Communicator CD-ROM.FLUENTdocumentation is also available on the Fluent Inc.User Services Center (www.fluentusers.com).iThe comments in this section about accessing les in the installation area
assume that all les on the documentation CD have been installed. If the les you are looking for are not in the installation area, you will need to install them or access them directly from the CD.cFluent Inc. October 12, 20062-5
Introduction toFLUENT2.3.1 Accessing theFLUENTDocumentation You can access theFLUENTdocumentation directly from the CD or, if the les have been installed in your Fluent Inc. installation area, you can also access them there. See the separate installation instructions for your platform type for information about installing the les from the documentation CD. How to Access the Documentation Files in the Installation Area If the HTML and/or the PDF les on the documentation CD have been installed, you can view the documentation by pointing your browser to:path/Fluent.Inc/fluent6.3/help/index.htm whereFluent.Incis the directory in whichFLUENThas been installed, and you must replacepathby the path to the directory whereFluent.Incis located. This will bring up theFLUENTdocumentation \home" page (Figure2.3.1), from which you can select the HTML or PDF version of the particularFLUENTmanual you want to view. For large manuals, PDF les are provided for the individual chapters in addition to a single PDF le for the entire manual.2-6cFluent Inc. October 12, 2006
2.3FLUENTDocumentationFigure 2.3.1: TheFLUENTDocumentation Home Pagec
Fluent Inc. October 12, 20062-7
Introduction toFLUENTHow to Access the Documentation on the CD The procedure for viewing the manuals directly on the CD diers slightly for UNIX and Windows systems.For UNIX systems, you can view the manuals by inserting the CD into your CD- ROM drive and pointing your browser to the following le:/cdrom/fluent6.3/help/index.htmwherecdrommust be replaced by the name of your CD-ROM drive.For Windows systems, you can view the manuals by inserting the CD into your
CD-ROM drive and pointing your browser to the following le:cdrom:\fluent6.3\help\Index.htm wherecdrommust be replaced by the drive letter of your CD-ROM drive (e.g.,E). This will bring up theFLUENTdocumentation \home" page (Figure2.3.1), from which you can select the HTML or PDF version of the particularFLUENTmanual you want to view. For large manuals, PDF les are provided for the individual chapters in addition to a single PDF le for the entire manual.2.3.2 Using the PDF Documentation
The PDF les are appropriate for viewing and printing with Adobe Acrobat Reader, which is available for most UNIX and Windows systems. These les are distinguished by a.pdfsux in their le names. If you do not have Adobe Acrobat Reader, you can download it (at no cost) from www.adobe.com.Navigating the PDF Files
For the purpose of easier on-line document navigation, the PDF les contain hyperlinks in the table of contents and index. In addition, hyperlinks have been applied to all cross-references to chapters, sections, gures, tables, bibliography, and index entries.2-8cFluent Inc. October 12, 2006
2.3FLUENTDocumentationPrinting the PDF Files
Adobe Acrobat PDF les are provided for printing all or part of the manuals. While you can also print individual HTML pages from your browser, the PDF les are recommended when printing long sections since the printout will have a higher quality. Note that you can select the paper size to which you are printing in Adobe Acrobat Reader by selecting theFile/Print Setup...menu item and choosing the desiredPaper size. If the page is too large to t on your paper size, you can reduce it by selecting the File/Print...menu item and choosing theReduce to Printer Marginsoption underPageScaling.
2.3.3 Using the HTML Documentation
Electronic versions of theFLUENTdocumentation are provided in HTML format. These les can be viewed using a standard web browser. To make it easier for you to nd the information you need, there are many built-in navigation tools available as well as printing options and other viewing options. The following sections describe the various options available to you when you are using the HTML documentation.Navigating the HTML Files
When you are viewing the HTML version of a manual in your browser, a set of navigation buttons appear at the upper right and lower right corners of the HTML page, as shownin Figure2.3.2.Figure 2.3.2: Navigation ButtonsThe navigation buttons are as follows:Searchdisplays a full text search popup window (Figure2.3.3).Return to Hometakes you to theFLUENTdocumentation home page (Figure2.3.1).Indextakes you to the index for the manual.Contentstakes you to the table of contents for the manual.Previoustakes you to the page just before the current one in the manual. Note that
this is not the same function as the \Back" button of your browser.cFluent Inc. October 12, 20062-9
Introduction toFLUENTUptakes you to the rst page of the current manual division (chapter or section).Nexttakes you to the next page in the manual. Note that this is not the same function
as the \Forward" button of your browser. Note that these buttons do not necessarily appear on all pages. Sometimes they appear but are inactive; in such cases they are \grayed out", as thePreviousandUpbuttons are in Figure2.3.2.Finding Information in the HTML Files
Three tools are available to help you nd the information you are looking for in an HTML version of a manual: Index The index gives an alphabetical list of keywords, each linked to relevant sections of the manual. You can access the index by clicking theIndexbutton that appears at the top and bottom of the page. Note that theIndexbutton does not appear if the manual does not have an index. In a larger manual, the index is split into a number of pages, each containing keywords starting with a particular letter; in this case, theIndexbutton will take you to the \A" index page.Table of Contents
The table of contents gives a list of the titles of the chapters, sections, and subsections of the manual in the order in which they appear. Each title is linked to the corresponding chapter or section. You can access the table of contents by clicking theContentsbutton that appears at the top and bottom of the page. Note that theContentsbutton does not appear if the manual does not have a table of contents.Browser Search
The full text search engine (Figure2.3.3) allows you to search the HTML manual for either single or multiple keywords. You can access the full text search engine by clicking the Search button that appears at the top of the page. To display the popup window and use the search engine, Javascript should be enabled in your web browser. Note that the Javascript search engine has been optimized for Netscape 4.7 and later, and InternetExplorer 5.5 and later.2-10c
Fluent Inc. October 12, 2006
2.3FLUENTDocumentationTo use the search engine, enter a specic term or keyword(s) in the text eld and click the
Search button. By default, the search engine will look for pages that contain any keyword input (Boolean OR). If you insert a+before the keyword input, then the search engine will look for pages that contain all of the keywords provided in the text eld (Boolean AND). Search results appear in the lower half of the search engine popup window. When search results extend below the bottom edge of the window, you can access those results by selecting the lower portion of the window and pressing thethe keyboard in order to activate scroll bars in the window.Figure 2.3.3: The Full Text Search EngineYou can also use the search capability provided by your browser to nd words or expres-
sions on a single page. For example, you can use theEdit/Find in Page...menu item in Netscape Communicator to search for the word \turbulence" on a page of the manual.cFluent Inc. October 12, 20062-11
Introduction toFLUENTPrinting Portions of a Manual Although you can print pages of an HTML version of a manual from your browser, a printout with higher quality can be obtained by using the PDF les provided on your documentation CD. See Section2.3.2:Printing the PDF Filesfor details.Modifying the Appearance of the HTML Files
There are a few things that you might want to change about the way your browser displays the HTML les in order to increase their usefulness.Font Size
The absolute size of the text that you see when viewing yourFLUENTdocumentation is dependent on a number of factors, including the resolution of your monitor screen. You can adjust the text size by changing the default font size in the preferences menu of your browser. In Netscape Communicator, for example, select theEdit/Preferences...menu item and then choose theAppearancecategory, where you will nd theFontscontrols. In Internet Explorer, you can change the font size by selecting an option from theView/Text Sizemenu. Try several sizes to see the eect on the appearance of the manuals, and choose the one that is best for you.Page Width
While reading a manual, you may nd a gure that is wider than your browser's window. As a result, part of the gure will be hidden from view. To see all of the gure, you can use the horizontal scroll bar at the bottom of your browser's window, or increase your browser's window size. You might also want to adjust the window size to increase or decrease the page width to a comfortable reading width.Tool Tips
When viewing the manuals with certain browsers, information about a gure will be displayed if you put your cursor over it. However, this information is not meaningful for most users, and you might nd it somewhat distracting. On some browsers, you can disable the display of \Tool Tips" in the preferences menu.2-12cFluent Inc. October 12, 2006
Chapter 3. Basic Steps for CFD Analysis usingFLUENTBefore you begin your CFD analysis usingFLUENT, careful consideration of the following
issues will contribute signicantly to the success of your modeling eort. Also, when you are planning a CFD project, be sure to take advantage of the customer support provided to allFLUENTusers.3.1 Steps in Solving Your CFD Problem
Once you have determined the important features of the problem you want to solve,follow the basic procedural steps shown below.1.Dene the modeling goals.2.Create the model geometry and grid.3.Set up the solver and physical models.4.Compute and monitor the solution.5.Examine and save the results.6.Consider revisions to the numerical or physical model parameters, if necessary.
Step 2 of the solution process requires a geometry modeler and grid generator. You can useGAMBITor a separate CAD system for geometry modeling and grid generation. You can also useTGridto generate volume grids from surface grids imported fromGAMBITor a CAD package. Alternatively, you can use supported CAD packages to generate volume grids for import intoTGridor intoFLUENT(see the User's Guide). For more information on creating geometry and generating grids using each of these programs, please refer to their respective manuals. The details of the remaining steps are covered in the User's Guide.cFluent Inc. October 12, 20063-1
Basic Steps for CFD Analysis usingFLUENT3.2 Planning Your CFD AnalysisFor each of the problem-solving steps, there are some questions that you need to consider:Dening the Modeling Goals{What results are you looking for, and how will they be used?What are your modeling options?What physical models will need to be included in your analysis?What simplifying assumptions do you have to make?What simplifying assumptions can you make?Do you require a unique modeling capability?Could you utilize user-dened functions (written in C)?{What degree of accuracy is required?{How quickly do you need the results?{How will you isolate a piece of the complete physical system?{Where will the computational domain begin and end?Do you have boundary condition information at these boundaries?Can the boundary condition types accommodate that information?Can you extend the domain to a point where reasonable data exists?{Can it be simplied or approximated as a 2D or axisymmetric problem?Creating Your Model Geometry and Grid
FLUENTuses unstructured meshes in order to reduce the amount of time you spend generating meshes, to simplify the geometry modeling and mesh generation process, to allow modeling of more complex geometries than you can handle with conventional, multi-block structured meshes, and to let you adapt the mesh to resolve the ow-eld features.FLUENTcan also use body-tted, block-structured meshes (e.g., those used byFLUENT4 and many other CFD solvers).FLUENTis capable of handling triangular and quadrilateral elements (or a combination of the two) in 2D, and tetrahedral, hexahedral, pyramid, wedge, and polyhedral elements (or a combination of these) in 3D. This exibility allows you to pick mesh topologies that are best suited for your particular application, as described in the User's Guide. You can adapt all types of meshes (except for polyhedral) inFLUENTin order to resolve large gradients in the ow eld, but you must always generate the initial mesh (whatever the element types used) outside of the solver, usingGAMBIT,TGrid, or one of the CAD systems for which mesh import lters exist.3-2cFluent Inc. October 12, 2006
3.2 Planning Your CFD AnalysisThe following questions should be considered when you are generating a mesh:{Can you benet from other Fluent Inc. products such asMixSim,Icepak, or
Airpak?{Can you use a quad/hex grid or should you use a tri/tet grid or hybrid grid?How complex is the geometry and
ow?Will you need a non-conformal interface?{What degree of grid resolution is required in each region of the domain?Is the resolution sucient for the geometry?Can you predict regions with high gradients?Will you use adaption to add resolution?{Do you have sucient computer memory?How many cells are required?How many models will be used?Setting Up the Solver and Physical Models
For a given problem, you will need to:{Import and check the grid.{Select the numerical solver (e.g., density based, pressure based, unsteady, etc.).{Select appropriate physical models.Turbulence, combustion, multiphase, etc.{Dene material properties.FluidSolidMixture{Prescribe operating conditions.{Prescribe boundary conditions at all boundary zones.{Provide an initial solution.{Set up solver controls.{Set up convergence monitors.{Initialize the
ow eld.cFluent Inc. October 12, 20063-3
Basic Steps for CFD Analysis usingFLUENTComputing and Monitoring Your Solution{The discretized conservation equations are solved iteratively.A number of iterations are usually required to reach a converged solution.{Convergence is reached when:Changes in solution variables from one iteration to the next are negligible.Residuals provide a mechanism to help monitor this trend.Overall property conservation is achieved.{The accuracy of a converged solution is dependent upon:Appropriateness and accuracy of physical models.Grid resolution and independence.Problem setup.Examining and Saving Your Results
Examine the results to review solution and extract useful data.{Visualization tools can be used to answer such questions as:What is the overall
ow pattern?Is there separation?Where do shocks, shear layers, etc. form?Are keyow features being resolved?{Numerical reporting tools can be used to calculate the following quantitative
results:Forces and momentsAverage heat transfer coecientsSurface and volume integrated quantitiesFlux balancesRevising Your Model
Once your solution is converged, the following questions should be considered when you are analyzing the solution:{Are physical models appropriate?Is ow turbulent?Is ow unsteady?Are there compressibility eects?Are there 3D eects?3-4cFluent Inc. October 12, 2006
3.2 Planning Your CFD Analysis{Are boundary conditions correct?Is the computational domain large enough?Are boundary conditions appropriate?Are boundary values reasonable?{Is grid adequate?Can grid be adapted to improve results?Does solution change signicantly with adaption, or is the solution grid
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Basic Steps for CFD Analysis usingFLUENT3-6c
Fluent Inc. October 12, 2006
Chapter 4. Guide to a Successful Simulation Using
FLUENTThe following guidelines can help you make sure your CFD simulation is a success. Beforecontacting your technical support engineer, make sure you do the following:1.Examine the quality of the mesh.
There are two basic things that you should do before you start a simulation:Perform a grid check to avoid problems due to incorrect mesh connectivity,
etc.Look at maximum cell skewness (e.g., using theComputebutton in theCon- tourspanel). As a rule of thumb, the skewness should be below 0.98.If there are mesh problems, you may have to re-mesh the problem.2.Scale the grid and check length units.
InFLUENT, all physical dimensions are initially assumed to be in meters. You should scale the grid accordingly. Other quantities can also be scaled independentof other units used.FLUENTdefaults to SI units.3.Employ the appropriate physical models.4.Set the energy under-relaxation factor between 0.95 and 1.
For problems with conjugate heat transfer, when the conductivity ratio is very high, smaller values of the energy under-relaxation factor practically stall the convergence rate.5.Use node-based gradients with unstructured tetrahedral meshes. The node-based averaging scheme is known to be more accurate than the default cell-based scheme for unstructured meshes, most notably for triangular and tetra- hedral meshes.6.Monitor convergence with residuals history.quotesdbs_dbs7.pdfusesText_13