Ansys Meshing - Sphere of Influence
Written by cfd.ninja
A Sphere of Influence sets the cell size inside a spherical region defined by a centre point and a radius, regardless of which bodies or faces happen to fall inside it.
It is the quickest local control to set up, since it needs only a coordinate system and one number for the radius. That makes it a good fit for compact features: a small inlet, the tip of a probe, the region immediately around an obstacle.
When the region is elongated rather than compact, such as a wake or a shear layer, a Body of Influence shaped to follow it wastes far fewer cells than a sphere large enough to cover the same length.
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