*** Entered By: jcooper @ 06/13/2006 10:08 AM ****
Q :
What does the following expert parameter do exactly?
"accept non overlap partitions = t"
|
This parameter arose out of a solver cleanup for situations where a single domain consists of 2 or more physically unconnected pieces (assemblies). When the partitioner decides how to split up the solution domain, it tries to make equal sized partitions while minimizing cut edges. For a situation in which you have 2 partitions and (say 2 metal cubes, both in the same CHT domain, suspended in air), the partitioner would cut the solution domain down the middle, making equal halves (in the case of a symmetrical geometry), and putting one cube in each partition. The reference to "non-overlap" is a domain-based term and applies to the fact that there is now no communication (node overlap) between the two pieces of the domain. This is a rare situation, because normally the partitioner is either forced to cut a domain somewhere or throw it all in one partition. If the partitioner had cut one of the cubes in half, for instance, there would be no ambiguity, because there would now be overlap (a shared set of nodes for that domain) between the two partitions. In most cases, setting this parameter may actually not do anything, because the solver is robust enough to handle the situation correctly, but, in the case of a failure, setting this parameter should catch any situation of this kind that does not get handled correctly. |
||
|