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7.16 Axis Boundary Conditions

The axis boundary type must be used as the centerline of an axisymmetric geometry (see Figure  7.16.1). It can also be used for the centerline of a cylindrical-polar quadrilateral or hexahedral grid (e.g., a grid created for a structured-grid code such as FLUENT 4). You do not need to define any boundary conditions at axis boundaries.

Figure 7.16.1: 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, FLUENT uses the cell value in the adjacent cell.

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