# tg06 - SEDAN GEOMETRYTOLERANT IMPORT 6 SEDAN...

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SEDAN GEOMETRY—TOLERANT IMPORT © Fluent Inc., Sep-04 6-1 6. SEDAN GEOMETRY—TOLERANT IMPORT In this tutorial you will import an IGES file containing the geometry for a sedan automo- bile, clean up the geometry, and mesh it with triangles and tetrahedra. In this tutorial you will learn how to: Import an IGES file using “tolerant modeling” Specify the way in which the geometry will be colored Merge faces to facilitate meshing Apply size functions to control mesh quality Mesh a volume with a tetrahedral mesh Prepare the mesh to be read into FLUENT 5/6 6.1 Prerequisites This tutorial assumes that you are familiar with the GAMBIT GUI. You should also familiarize yourself with the previous tutorial, which employs GAMBIT virtual clean-up operations for importing the sedan geometry.

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Problem Description SEDAN GEOMETRY—TOLERANT IMPORT 6-2 © Fluent Inc., Sep-04 6.2 Problem Description Figure 6-1 shows the sedan geometry used in this tutorial. The external body of the sedan is represented by a set of connected faces. To model the flow around the sedan body, you will create a brick volume that represents the flow domain. Figure 6-1: Sedan geometry
SEDAN GEOMETRY—TOLERANT IMPORT Strategy © Fluent Inc., Sep-04 6-3 6.3 Strategy In this tutorial, you will create a fully unstructured tetrahedral mesh around a car-body geometry imported as an IGES file. This tutorial illustrates the steps you would typically follow to prepare an imported CAD geometry for meshing. The IGES-file contains “dirty” geometry—that is, gaps exist between some of the surfaces that make it unsuitable for creating a CFD mesh. You will clean up the geometry using the GAMBIT “tolerant modeling” capability. The tolerant modeling option automatically assigns a tolerance value to each imported vertex and edge to maintain topological integrity for the imported model. The original CAD geometry is not modified during the import process. The imported geometry includes a number of small surfaces, the edges of which may unnecessarily constrain the mesh generation process. Using the “merge faces” command, GAMBIT allows you to easily combine these surfaces prior to meshing. You can then have GAMBIT automatically create a triangular mesh on the car body. Since the imported geometry consists only of the car body, you need to create a suitable domain around the car in order to conduct a CFD analysis (this is loosely equivalent to placing the car in a wind tunnel). The remainder of the tutorial shows how to add a real box around the car body, use virtual geometry to create some missing faces, and finally stitch all faces together into a single volume. This volume can then be meshed (without any decomposition) using a tetrahedral meshing scheme.

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Procedure SEDAN GEOMETRY—TOLERANT IMPORT 6-4 © Fluent Inc., Sep-04 6.4 Procedure 1. Copy the file path /Fluent.Inc/gambit2. x /help/tutfiles/sedan.igs (where 2. x is the GAMBIT version number) from the GAMBIT installation area in
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tg06 - SEDAN GEOMETRYTOLERANT IMPORT 6 SEDAN...

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