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The horizontal boundary will be set to "axis" which will impose zero gradients perpendicular to the boundary and will tell Fluent that the full domain is rotated about this axis. Note that Fluent only allows axisymmetric rotation about the x-axis.

Symmetry:

The outer vertical boundary will be set to “wall”. Then we will set a zero-flux boundary condition, which corresponds to an impermeable wall when discussing diffusion“symmetry” which will impose zero gradients perpendicular to the boundary. Note that Fluent allows symmetric boundary conditions along any axis.

Please see the hand out below for more details:

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