At the moment, Wakis implements an hexahedral grid, allowing different mesh sizes in x, y and z directions. To improve convergence with lower number of computational cells, a non-uniformly spaced, grid refinement method is needed.

The idea--following the established Snappy HexMesh algorithm present in OpenFOAM and CST Studio--is to develop an optimizer that can extract the relevant edges of the CAD geometry, defines the target snappy lines, and refines the mesh around them.

Reference: https://www.openfoam.com/documentation/user-guide/4-mesh-generation-and-conversion/4.4-mesh-generation-with-the-snappyhexmesh-utility