# tg01 - CREATING AND MESHING BASIC GEOMETRY 1 CREATING AND...

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CREATING AND MESHING BASIC GEOMETRY © Fluent Inc., Sep-04 1-1 1. CREATING AND MESHING BASIC GEOMETRY This tutorial illustrates geometry creation and mesh generation for a simple geometry using GAMBIT. In this tutorial you will learn how to: Start GAMBIT Use the Operation toolpad Create a brick and an elliptical cylinder Unite two volumes Manipulate the display of your model Mesh a volume Examine the quality of the mesh Save the session and exit GAMBIT 1.1 Prerequisites This tutorial assumes you have no prior experience of working with GAMBIT. You should, however, read Chapter 0, “Using This Tutorial Guide,” to familiarize yourself with the GAMBIT interface and with conventions used in the tutorial instructions.

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Problem Description CREATING AND MESHING BASIC GEOMETRY 1-2 © Fluent Inc., Sep-04 1.2 Problem Description The model consists of an intersecting brick and elliptical cylinder. The basic geometry is shown schematically in Figure 1-1. 10 12 6 6 10 10 Figure 1-1: Problem specification
CREATING AND MESHING BASIC GEOMETRY Strategy © Fluent Inc., Sep-04 1-3 1.3 Strategy This first tutorial illustrates some of the basic operations for generating a mesh using GAMBIT. In particular, it demonstrates: How to build the geometry easily using the “top-down” solid modeling approach How to create a hexahedral mesh automatically The “top-down” approach means that you will construct the geometry by creating volumes (bricks, cylinders, etc.) and then manipulating them through Boolean operations (unite, subtract, etc.). In this way, you can quickly build complicated shapes without first creating the underlying vertices, edges, and faces. Once you have built a valid geometry model, you can directly and (in many cases) auto- matically create the mesh. In this example, the Cooper meshing algorithm is used to auto- matically create an unstructured, hexahedral mesh. More complicated geometries may require some manual decomposition before you can create the mesh; this is demonstrated in subsequent tutorials. The steps you will follow in this tutorial are listed below: Create two volumes (a brick and an elliptical cylinder). Unite the two volumes. Automatically generate the mesh. Examine the quality of the resulting mesh. To keep this introductory tutorial short and simple, certain steps that you would normally follow have been omitted: Adjusting the distribution of nodes on individual edges of the geometry Setting continuum types (for example, identifying which mesh zones are fluid and which are solid) and boundary types These details, as well as others, are covered in subsequent tutorials.

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Procedure CREATING AND MESHING BASIC GEOMETRY 1-4 © Fluent Inc., Sep-04 1.4 Procedure Type gambit -id basgeom to start GAMBIT.
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