Fluent Gambit 提示和技巧 教程 2001 UGM Gambit Tips & Tricks.ppt
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1、2001 UGM Gambit: Tips & Tricks,June 4, 2001 Shyam Kishor,Outline,Data exchange with other CAD/CAE systems Clean-up and Construction strategies Useful Tips New Features of Gambit 2.0,Data exchange with other CAD/CAE systems,Direct options Standard-based options Importing meshes and faceted geometry C
2、AD-to-Gambit flowchart summaries,Direct Options - 1,ACIS-based CAD programs: e.g., AutoCAD, Cadkey, TurboCad Can export ACIS files (.sat or .sab) which can be imported into Gambit. ACIS version compatibility Gambit typically employs recent ACIS rev. (ACIS 6.3 for Gambit 2.0) Gambit can import and ex
3、port older versions of ACIS. Parasolid -based CAD programs: e.g., Unigraphics, SolidWorks, Solid Edge, PATRAN, ANSYS Can export Parasolid files (.x_t & .xmt_txt) which can be imported into Gambit Parasolid version compatibility Gambit can import and export most versions up through 11.1,Direct Option
4、s - 2,Direct (single-stage) translators for native CAD systems e.g., Pro-E/ACIS, Catia/ACIS Available from various vendors (see http:/ for full listing),Standard - based Options,Use of neutral file format to exchange data STEP IGES,Data exchange via STEP,STEP (STandard for the Exchange of Product mo
5、del data) : International standard that defines a neutral file format for the exchange of geometric, topologic, and annotation data. Most CAD programs include STEP export Pro/ENGINEER at no additional cost Most others as an add on Both STEP AP203 and STEP AP214 are supported by Gambit Better than IG
6、ES STEP supports solid models Creates real Gambit (ACIS) volumes after import. Topology/connectivity-related information is maintained STEP export Exports real geometry, including solid volumes,Data exchange via IGES,IGES (Initial Graphics Exchange Specification) Files: Most CAD programs can export
7、IGES files. Topology/connectivity information is lost when CAD programs export IGES surface data only. Some CAD packages export IGES-solids as well as IGES-surfaces. I-DEAS and CADDS Topology/connectivity information maintained. Gambit provides two options for IGES import Spatial Creates real geomet
8、ry Supports IGES-solids (MSBO) Native Creates virtual geometry for trimmed surfaces Supports surfaces only Use only as a fallback when Spatial translator fails IGES export Exports real geometry Supports IGES solids (MSBO),STEP/Parasolid-to-Gambit Flowchart,Real Geometry,Geometry Import,Check Geometr
9、y,Okay?,Connected?,Heal,No,Yes,No,Yes,Check Geometry,Heal,Connected?,Use Virtual Geometry,Better?,Yes,No,No (undo),Yes,STEP/ Parasolid,IGES-to-Gambit Flowchart,Real Geometry,Spatial Translator,IGES,Native Translator,Okay?,Check Geometry,Okay?,Connected?,Heal,No,Yes,No,Yes,Check Geometry,Heal,Connect
10、ed?,Use Virtual Geometry,Better?,Yes,No,No (undo),Yes,No,Yes,Data exchange via Mesh/Faceted Geometry-1,Import of mesh or faceted geometry files results in faceted geometry Supported Mesh Formats Faceted Geometry Formats FLUENT4 I-DEAS FTL FLUENT5 Optegra Visualizer TGRID STL FIDAP GAMBIT I-DEAS UNV
11、(Universal format) ANSYS PLOT3D (Formatted) NASTRAN PATRAN HYPERMESH,Data exchange via Mesh/Faceted Geometry-2,PLOT3D files with Iblanking and/or of binary type Use tfilter fe2ram from an operating system command prompt to first convert it to a Fluent/Fidap mesh file Import the resulting mesh in Gam
12、bit. Import of Mesh with hanging nodes is not supported Mesh Files Boundary types are not preserved during import. Generates faceted geometry from surface or volume mesh import. Use Virtual Geometry operations to work with entities. Convert virtual geometry to real if needed. Faceted Geometry Files
13、Similar to mesh but defining triangles unsuitable for meshing STL lacks zone grouping Use Feature Angle to separate faces Works well for well-defined edges; otherwise use as last resort.,CAD-to-Gambit Flowchart Summaries,In general, translation options listed in order of decreasing preference (left
14、to right). Some options require third party translator software. Best translation path depends on quality of CAD data (model).,Pro/E-to-Gambit Flowchart,Pro/Engineer,Gambit,Direct (STEP),Direct Translator,STEP,Optegra Visualizer,Mesh,STL,(real geometry),(faceted geometry),IGES*,*IGES native may prod
15、uce virtual geometry,ACIS,Direct Integration of Pro/E with Gambit 2.0,Catia-to-Gambit Flowchart,Catia,Gambit,IGES Solids (AIX only),Catia-ACIS Translator,STEP,IGES Surfaces*,Mesh,STL,ACIS,(real geometry),(faceted geometry),*IGES native may produce virtual geometry,I-DEAS-to-Gambit Flowchart,I-DEAS,G
16、ambit,IGES* MSBO,STEP,Faceted Part File (FTL),Mesh,STL,(real geometry),(faceted geometry),*IGES native may produce virtual geometry,Unigraphics-to-Gambit Flowchart,Unigraphics,Gambit,STEP,Unigraphics-ACIS Trans.,Parasolid,IGES*,Mesh,STL,ACIS,(real geometry),(faceted geometry),*IGES native may produc
17、e virtual geometry,SolidWorks-to-Gambit Flowchart,SolidWorks,Gambit,STEP,IGES*,Mesh,STL,ACIS,(real geometry),(faceted geometry),Direct ACIS Export,Parasolid,*IGES native may produce virtual geometry,CADDS-to-Gambit Flowchart,CADDS,Gambit,IGES*,CADDS-ACIS Translator,STEP,Mesh,STL,ACIS,(real geometry)
18、,(faceted geometry),*IGES native may produce virtual geometry,Outline,Data exchange with other CAD/CAE systems Clean-up and Construction strategies Useful Tips New Features of Gambit 2.0,Typical Cleanup Procedure for Imported Data,Delete unnecessary geometry Check validity of the geometry (visual +
19、check commands) Correct invalid geometry (Healing and/or reconstruction) Check connectivity by color coding Eliminate short edges Check connectivity Create additional geometry and form volume Simplify/edit edges, faces, volumes Decompose volume, if necessary Mesh the geometry Plan ahead Some operati
20、ons will not work with virtual geometry (booleans, sweeps except edges, revolves, certain splits) Postpone operations that create virtual entities.,Check Real Geometry,Checks for geometrical and topological inconsistencies. Topology problems must be fixed before meshing Geometry not C1, C2, G1or G2
21、Indicates lack of parametric/geometric continuity Operations like real booleans, splits and sweeps may fail Use virtual splits as fallback Do not prevent meshing Fix real geometry problems by healing and/or by regenerating entities Fix topology and virtual/faceted geometry problems by deleting (hidi
22、ng) and reconstructing entities,Typical Cleanup Procedure for Imported Data,Delete unnecessary geometry Check validity of the geometry (visual + check commands) Correct invalid geometry (Healing and/or reconstruction) Check connectivity by color coding Eliminate short edges Check connectivity Create
23、 additional geometry and form volume Simplify/edit edges, faces, volumes Decompose volume, if necessary Mesh the geometry Plan ahead Some operations will not work with virtual geometry (booleans, sweeps except edges, revolves, certain splits) Postpone operations that create virtual entities.,Healing
24、 Real Geometry-1,Healing is designed to detect and correct accuracy problems in ACIS models ACIS (geometry kernel of Gambit), a high precision modeler, needs all entities to satisfy stringent data integrity checks Geometry imported from other CAD systems often lacks the required accuracy & precision
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