Step 2: Mesh Geometry in GAMBIT

We'll now create a mesh on the rectangular face with 100 divisions in the vertical direction and 30 divisions in the horizontal direction. We'll first mesh the four edges and then the face. The desired grid spacing is specified through the edge mesh.

Mesh Edges

Operation Toolpad > Mesh Command Button > Edge Command Button > Mesh Edges

Mesh Strategy

In creating this mesh, it is desirable to have more cells near the plate (Edge 1) because we want to resolve the turbulent boundary layer, which is very thin compared to the height of the flow field.

Click the up arrow button next to the Edges box in the Mesh Edges window. Select edge Edge.2. Then push the right arrow button to bring this vertex into the Picked column. Notice that the arrow on the selected edge should be pointing upwards. An upwards pointing arrow indicates the direction of closely spaced nodes to widely spaced nodes. Remember, we will need more closely spaced nodes near the boundary layer in order to resolve it accurately.

The proper arrow direction is necessary to ensure a proper mesh. Select Edge.4 in the Mesh Edges window. The arrow on this edge is pointing downwards, which needs to be changed. Shift + Middle-click on the selected edge to change the direction of the arrow to upward.

Under Type, select Successive Ratio, if it is not already selected. Set Ratio to 1.08. Under Spacing, select Interval Count. Set Interval Count to 100 and then click Apply.

Select Edge.1 and Edge.3 in the Mesh Edges Window. The direction of the arrows on these edges is irrelevant because the divisions will be the same length. Leave the Successive Ratio set to 1 and set the Interval Count to 30. Click Apply.

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Mesh Face

Operation Toolpad > Mesh Command Button > Face Command Button > Mesh Faces

Shift left-click on the face or use the up arrow next to Faces to select the face. Click Apply.

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Go to Step 3: Specify Boundary Types in GAMBIT

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