May anybody suggest me a library for mesh coarsening? I need to coarse my grid during the simulation (like a multigrid) Luca

try this one http://tetra.mech.ubc.ca/GRUMMP/

Thanks Renato. It seems GRUMMP is the only library available on the net. I have some problems in compiling with gcc 4...but I'm trying to use it. Is this the only one you know? Luca

I must admit that I haven't got success with GRUMMP too...

You're right regarding the lack of coarsening libraries available. I have already tried to find Googling around but I only found GRUMMP, Pyramid and MGridGen.

Pyramid is available at OpenFoundation site ( http://www.openchannelfoundation.org/projects/Pyramid ) it's written in Fortran90 and work with ParMetis in parallel doing AMR

MGridGen and ParMGridGen ( http://www-users.cs.umn.edu/~moulitsa/software.html ) are softwares of the same group that released Metis and ParMetis. It was a product of Irene Moulitsas research in her PhD but the software only works with CSR graph structures.

I work with 3D/FEM/linear-tetrahedra and I haven't found a library free, easy to use and install for doing mesh coarsing for my case. If you find any library that fits these features, please post a message here because I'm in the same boat than you ;-)

Regards

Renato.

Dear Renato, unfortunately GRUMMP still gives me a lot of errors...It 's the only library to coarse a grid into usable tetrahedra. Pargridgen by Irene would be great but it just a tool for grid agglomeration (for multigrid purposes). Instead, I 'd like to reduce the number of cells (GRUMMP does exaclty what I want...) If anybody using GRUMMP could help me maybe I'd not give up with GRUMMP. Thanks a loto Renato Luca