I need to create stuctured uniform, structuted non-uniform, and unstructured mesh in 2D

[dokken]

To me, it looks like you could use a uniform unit square (consisting of quadrilateral elements), and apply a deformation field to the nodes to get the second and third grid.

I’ve added an explanation on how to move nodes at

Moving submesh diverges from its designated trajectory in a two-phase problem

This is not the right thing to do, as this assumes alot of things about the ordering of degrees of freedom. Here is a minimal example that maps a displacement field from a mesh onto a submesh: """ Map degrees of freedom to the mesh geometry nodes and corresponding submesh. Author: Jørgen S. Dokken and Henrik N.T. Finsberg SPDX-License-Identifier: MIT """ from mpi4py import MPI import dolfinx import numpy as np def vertex_to_dof_map_vectorized(V): """Create a map from the vertices of th…