Allow VTKFile to support multiple mesh topologies

[karimnorouzi]

VTKFile supports only one mesh currently.

when ALE methods are used. The mesh moves and possibly topology of mesh changes, so one needs to use multiple pvd files to save the results of simulation.

It is helpful to have VTKFile support multiple meshes, so that one can use a single file to view simulation results for ALE simulations.

Thanks.

[colinjcotter]

To clarify, this was about having different meshes (different coordinates/topology) at different vtu dumps in the sequence collated by the .pvd file.

[connorjward]

Does the adaptive option help in any way?

adaptive – allow different meshes at different exports if True.

[karimnorouzi]

is that option already there ? I have not tried it.
Let me see if it solves the problem.

[karimnorouzi]

it seems to work.

[karimnorouzi]

what is the purpose of this flag. It does not work exactly as desired it seems. when the topology changes, it does not update the mesh.