Re: [Libmesh-users] POssiible to save two mesh states for the same equations systems object?

[Roy S. <roy...@ic...>]

On Fri, 17 Aug 2012, Subramanya Gautam Sadasiva wrote:

> I am trying to write a small multiphysics code with Libmesh and part
> of it needs a very dense mesh while other parts can do with a less
> dense mesh. However, the same fields need to be accessible across
> all the meshes. Is it possible to save both a refined and coarsened
> mesh state at the same time and transfer results between them?

You can use two separate Mesh objects, two EquationSystems, and a
MeshFunction object to do this.  The scaling won't be great, though -
because of the point locator required by MeshFunction, your assembly
would become O(N_E*log(N_E)) instead of just O(N_E).  If you're
running a non-adaptive time-dependent problem (or multiple forcing
functions, or some other reason to do multiple assemblies on the same
mesh) you could cache mesh-to-mesh mappings in a hash map to amortize
the lookups.
---
Roy