I am running a simulation in parallel in ANSYS CFX 11 which features a moving mesh with a GGI interface.
I noticed that the overlap nodes are very high for my parallel partitions and I can't reduce this by changing to
a different partitioning method.
If I run the case without moving mesh, the overlap nodes are much reduced.
What's going on?
If the mesh on either side of an interface is moving, then all nodes on that interface are marked as overlap. `Overlap` simply means that a node (and it`s associated mesh faces) is a candidate for interface re-intersection.
This is required since, with moving mesh, we never know a-priori where (or how) the mesh on each side of the interface will actually intersect; we must presume that point `A` on one side of the interface could intersect with *any* point on the other side of the interface.
Although the memory usage will be increased due to the high overlap, there shouldn't be too large a hit in terms of the
CPU time required for the solution.