Ansys Meshing – Sizing

Sizing controls decide where the cells go, and that is the single most important choice in a CFD mesh. A fine mesh in the wrong place costs time and changes nothing.

The global element size sets the baseline. On top of it, curvature refinement adds cells where the surface bends, using the maximum angle you allow across one element, and proximity refinement adds cells where two surfaces approach each other, driven by how many elements you require across the gap. Local controls on a body, a face or an edge then override the baseline where you need it.

Aim for smooth transitions. Neighbouring cells that differ sharply in size produce skewed elements, and skewness is what degrades convergence long before the total cell count does.