To remesh a face mesh, use the operations Free Triangular or Free Quad. Another way of improving the quality of an imported surface mesh is to use the Adapt operation, which is described in more detail in the section Modifying the Element Size Using Refine and Adapt. However, the Adapt operation is designed to preserve the anisotropy of a mesh, so if there is a lot of elements with acute angles, the Free Triangular operation can be a better option. Use several Adapt or Free Triangular operations, or combine them, to get rid of traces of elements with acute angles or to further smooth out irregularities in the mesh.

To remesh an imported domain mesh, clear the check box Import domain elements check box in the Mesh Import node or use a Delete Entities operation to delete the domain elements. Once the surface mesh is of sufficiently good quality, add a Free Tetrahedral and Swept operations to mesh the domains. If needed, add Boundary Layers once the domain mesh is restored. The mesh is now ready to be used for simulation. No geometry is needed in this case.

As an alternative, it is possible to generate a geometry from the imported mesh before creating a mesh for simulation. For more information about this workflow, see Creating Geometry from Mesh.