I am using FreeFEM++ 4.8 on Windows 10. Lately, I’ve tried several eigenvalue problems in parallel using SLEPc-complex and I have a few questions.
- Is there some sort of value scaling in SLEPc when it comes to computing the eigenmodes? In the example “navier-stokes-2d-SLEPc-complex” the Vec Value range in the interval [0 0.03455], which seems a bit low. I also checked and compared the results from other cases I have by running them on a single core (using FreeFEM++ and EigenValue) and in parallel (with FreeFEM+±mpi and EPSSolve). The eigenvalues obtained are the same, the spatial structures are identical, the only thing that differs is the iso value ranging values as you can see in the photo attached.
2)Is there any way to make the graph resulting from using "-eps_view_values draw " bigger, maybe with custom axis?
3)If I use “plot” instead of “plotMPI” I only get a sub-domain. May I use plot in MPI without these lines from partitioning?
4) Since ParaVIEW can’t handle P2 elements, I prefered MatLAB for post-processing but now, in parallel it doesn’t save the files anymore. Is there some activation I must do in the command prompt (such as -wg for plotting, -v for verbosity)?
Sorry for the long post and thank you in advance.