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Step 1: Create Geometry in GAMBIT

Start GAMBIT & Select Solver

Specify that the mesh to be created is for use with FLUENT 6:

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Strategy for creating flow field geometry

In creating the geometry for our flow field we must consider what is necessary for our model to approximate real flow. A boundary layer grows along the plate, which must satisfy the no slip condition. The flow velocity at the plate must be zero. Continuity requires that this condition gives rise to a y-velocity. Although the y-velocity is significantly smaller in magnitude than the x-velocity, it can affect the solution significantly if not taken into consideration when creating the geometry of the flow field.

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We will first create four vertices at the four corners and join adjacent vertices to get the edges of the rectangle. We will then form a face that covers the area of the rectangle.

Create Vertices

We will treat this problem as a 2-dimensional problem by assuming that the plate is infinitely wide. Let's begin by creating the vertices that define our flow region.

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Another useful button on the Operation Toolpad is the Orient Model button . If you click and hold the left mouse button and then move the mouse, the model will rotate 3-dimensionally. This is, of course, not usually a helpful feature when creating 2-D models in GAMBIT. Click the Orient Model button to make the z-axis normal to the page again.

Create Edges

An edge is created by selecting two vertices and creating a line between them.

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(click picture for larger image)

Create Face

Operation Toolpad > Geometry Command Button > Face Command Button > Form Face

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(click picture for larger image)

Save

Save your GAMBIT file in your working directory.

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