The ability to extrude a boundary face zone allows you to extend the solution domain without having to exit the solver. A typical application of the extrusion capability is to extend the solution domain when recirculating flow is impinging on a flow outlet. The current extrusion capability creates prismatic or hexahedral layers based on the shape of the face and normal vectors computed by averaging the face normals to the face zone's nodes. You can define the extrusion process by specifying a list of displacements (in SI units) or by specifying a total distance (in SI units) and parametric coordinates.
| Note that extrusion is not possible from boundary face zones that have hanging nodes.
Specifying Extrusion by Displacement Distances
You can specify the extrusion by entering a list of displacement distances (in SI units) using the extrude-face-zone-delta command.
grid modify-zones extrude-face-zone-delta
You will be prompted for the boundary face zone ID or name and a list of displacement distances.
Specifying Extrusion by Parametric Coordinates
You can specify the extrusion by specifying a distance (in SI units) and parametric coordinates using the extrude-face-zone-para command
grid modify-zones extrude-face-zone-para
You will be prompted for the boundary face zone ID or name, a total distance, and a list of parametric coordinates. The list of parametric coordinates should begin with 0.0 and end with 1.0. For example, the following list of parametric coordinates would create two equally spaced extrusion layers: 0.0, 0.5, 1.0.