Ansys Meshing - Body of Influence
Written by cfd.ninja
A Body of Influence refines a region of the mesh without belonging to the simulation. It is a dummy body, frozen and suppressed for physics, whose only job is to tell the mesher what cell size to use inside its volume.
That is the tool for regions the geometry does not define: the wake behind a body, the spreading path of a jet, the zone a free surface will sweep, the volume around a rotating part. None of them coincide with a face, so a face sizing cannot reach them.
Keep it close to the region that matters and keep the size ratio with the surrounding mesh moderate. An oversized body of influence is the fastest way to multiply the cell count without improving the answer.
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