Dear all, Sorry for the spam and being new to the field.
I am currently trying to implement an elastodynamics problem with explicit method (central difference method, to be specific). I am planning to use lumped mass matrix (and Rayleigh damping when needed), so the system matrix will be simply a diagonal matrix. Solving is therefore trivial - I just need to do per-element division of the rhs by the diagonal entries to get the solution vector. For this problem, I have the option of just treating it as an implicit system - fill the system.matrix with only diagonal components and call the PETSc LU solver. This is very easy thanks to a lot of the libmesh infrastructure available. If I do so, should I be concerned about a significant slowdown? Or would PETSc be smart enough to realize that this is already diagonal matrix and be efficient in solving it? My other choice would be to create a NumericVector myself to store the diagonal system matrix entries, and perform the per-element division. This would take more work and will not be using the already well-tested libmesh infrastructure, so I am trying to see whether I can get away with doing this without compromising on the performance. Feedback would be very appreciated. Thank you! Best, Shawn -- Yuxiang "Shawn" Wang, PhD yw...@virginia.edu +1 (434) 284-0836 _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
