7.3.17 Axis Boundary Conditions

The axis boundary type must be used as the centerline of an axisymmetric geometry (see Figure  7.3.30). It can also be used for the centerline of a cylindrical-polar quadrilateral or hexahedral mesh (e.g., a mesh created for a structured-mesh code such as FLUENT 4). You do not need to define any boundary conditions at axis boundaries.

Figure 7.3.30: Use of an Axis Boundary as the Centerline in an Axisymmetric Geometry

Calculation Procedure at Axis Boundaries

To determine the appropriate physical value for a particular variable at a point on the axis, ANSYS FLUENT uses the cell value in the adjacent cell.