Ansys Meshing - Sphere of Influence
Written by cfd.ninja
A Sphere of Influence refines the mesh inside a spherical region defined by a centre point and a radius, independently of the geometry that happens to lie there.
It is the quickest of the local controls, because you only need a coordinate system and two numbers. That makes it ideal for a localised feature: the tip of a probe, a small inlet, the region right around an obstacle, anywhere the gradients concentrate in a compact zone.
When the region you need to refine is not compact, a wake or a shear layer for instance, a Body of Influence fits it better, since you can shape the dummy body to follow the flow instead of forcing a sphere around it.
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