Elmer Discussion Forum

Hi Kevinarden, CrocoDuck, Thnx for your informative replies. I guess correct use of periodic/symmetry BCs is indeed key to my problem. Moreover good to keep in mind the plane wave BC assumes units of velocity and not of density times velocity! To save memory I need to keep using a divided geometry p...

For design activities on duct noise control I am trying to set up a frequency scanning simulation of air duct acoustics in Elmer. Through this very helpful tutorial of CrocoDuck I learnt how to do that for a rigid walled room. However I am considering a duct which is open on one side and therefore t...

Hi Matthias, That was a fast reply! I checked the simulation in serial mode by running the Umfpack solver instead of MUMPS, so Linear System Direct Method = umfpack in the SIF file. Still the crash occurs: ELMER SOLVER (v 7.0) STARTED AT: 2013/05/10 11:44:12 MAIN: MAIN: =============================...

Hi Matthias, I checked your suggestion and the segfault still occurs. See the log below: Starting program Elmergrid Elmergrid reading in-line arguments The mesh will be partitioned with Metis to 2 partitions. Lower dimensional boundaries will be removed Materials and boundaries will be renumbered No...

I'm calculating displacements and stresses using Elmer 7.0 (Rev: 6003) on Ubuntu 12.10 x86_64. The mesh is generated by Gmsh 2.7.0 with 2nd order elements (types 203, 306, 510). If I change from StressSolve to ElasticSolve, Elmer crashes with a segfault, so there seems to be a bug hidden somewhere. ...

Hi Juha, In the mean time we installed the CHOLMOD solver of SuiteSparse on Ubuntu 10.04 following your instructions, and we managed to get it compiled and running (don't ask how, I'm afraid we cannot reproduce the compilation ;-))/ With it we ran a successful eigenmode simulation on a model of ~ 20...

Hello Juha, Any possibility of mixups btw mpi ElmerSolver was compiled with vs your installed mpi? Your mpi is openmpi, i guess? Juha Yes, we have only tried OpenMPI so far. Whatever we tried on Debian 6.0.1a or Ubuntu 10.04, we couldn't get our test case to complete at all when using MUMPS / OpenMP...

Hello Juha, Thanks a lot for your extensive reply! We already tried to get the MUMPS solver up and running last week, but haven't looked at the other options yet. Compiling ElmerSolver is not a problem; we have been running custom builds from your repository for about half a year now. Getting it to ...

We are small technology start-up company and use with great satisfaction ElmerFEM for our mechanical analysis. We need to perform modal analysis on a large (> 200k nodes) domain. From our experience with Elmer for smaller domains (~10k - 100k nodes), the direct solver Umfpack handles this type of si...