Elmer Discussion Forum

Hi Matthias, We're doing thermal simulations of electronic circuits: we're building the 3D models, mesh them with Gmsh and then simulate them with Elmer. The complexity of some of the simulated components is too much for Gmsh to handle (crashes, incorrect meshes), so we thought that Salome is more r...

You mean the UNV format can have any of those 3300+ fields? Yeah, that'd be pretty complicated. I don't know if this helps -- I've tried to import the mesh in Gmsh (which should understand UNV files too). Gmsh was able to import a single volume, which is number 2, the one that's imported as a shell ...

Thanks for the update. I'm also looking at the ElmerGrid code, maybe I can spot the problem myself; I'm also trying to figure out whether the formatting of the file is somehow wrong, but I have a hard time finding a document with the specifications for UNV files: do you know of any such document? Wi...

Hi Peter,

any luck identifying the problem in the ElmerGrid conversion?

Thanks,
Tibi

I don't have any direct experience with very small characteristic lengths (like you, I've used box fields with reasonably large characteristic lengths and it worked). However, one thing that you might want to try is to scale the model: for example, if the dimensions of your model are in meters, scal...

Hi Peter,

I'm trying to attach the gzip-ed unv file (it's 1.3MB) -- hopefully it can be processed. As mentioned, the UNV file is produced using Salome 5.1.5 for Windows. I'm using Elmer 6.1 for Windows.

Thanks for taking a look at this.

Tibi

Thanks for the suggestion. I've used that flag and it almost does what I need. Here's the (truncated) output: Reading group 1 with 35404 entities: sld_0 Reading group 2 with 13001 entities: sld_1 <-- group 2 is a solid Reading group 3 with 11 entities: sld_2 Reading group 4 with 42 entities: sld_3 ....

I'm trying to migrate from Gmsh to Salome for meshing my geometries, but I'm encountering significant differences in results between the two. Basically, In Gmsh I was scripting the .geo file such that every solid and every face from the .brep geometry file becomes a physical volume and physical surf...

Hi Peter, thank you for your reply. I've looked at those pages, and it seems that the heat transfer coefficient is defined only for fluid to fluid or fluid to solid interaction. The boundary condition I'm trying to model here is a solid to solid interaction. Basically, the problem arose from trying ...

I'm trying to set this simulation in which one of the faces in the design has an external constant temperature source, but I'm not sure exactly how to set it up. Here's what I came up with so far, but I'm not confident it does what I want to: Boundary Condition 7 Target Boundaries(1) = 65 Name = &qu...