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In an external flow such as the flow past a cylinder, we have to define farfield boundaries and mesh the region between the cylinder geometry and the boundaries. Farfield boundaries should be placed well away from the cylinder so that they are not under the influence of the flow around cylinder.

(Add Figure)
Figure above shows the geometry of such mesh.

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Operation Toolpad > Geometry Command Button
Image Added > Vertex Edge Command Button
Image Added > Create VertexEdge Image Added

Create the vertices by entering the coordinates under Global and the label under Label:

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Operation Toolpad > Geometry Command Button Image Modified > Edge Vertex Command Button Image Removed Image Added > Create Edge Image RemovedVertex Image Added

Create the edge 4-12 by selecting the vertex 1 followed by vertex 2. Click Apply. GAMBIT will create the edge. You will see a message saying something like "Created edge: edge.1'' in the Transcript window.

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