Search found 63 matches

by tibich72
21 Jun 2013, 14:01
Forum: ElmerSolver
Topic: Modeling Surface Roughness for Heat Transfer
Replies: 5
Views: 1144

Re: Modeling Surface Roughness for Heat Transfer

Hi Franz,

thanks for the tip. I could find some info on that and was able to do the experiment. Thanks again. Maybe next version of the Models Manual would include some documentation on Heat Gap.
by tibich72
21 Jun 2013, 10:29
Forum: ElmerSolver
Topic: Modeling Surface Roughness for Heat Transfer
Replies: 5
Views: 1144

Re: Modeling Surface Roughness for Heat Transfer

Hi Franz,

thanks for the suggestion. I've looked in the Elmer Models Manual, and could not find anything about 'Heat Gap" (the phrase does not exist, and gap is used only in solving thin channel flows). Could you elaborate a bit on this? Thanks.
by tibich72
20 Jun 2013, 15:04
Forum: ElmerSolver
Topic: Modeling Surface Roughness for Heat Transfer
Replies: 5
Views: 1144

Modeling Surface Roughness for Heat Transfer

I am conducting a set of simulations in which different materials are used to spread the heat from a heat source. I have the physical measurements to compare the simulations against. Some experiments have some adhesive between the spreader and the plastic body in which the temperature is measured, a...
by tibich72
06 Sep 2012, 18:52
Forum: ElmerSolver
Topic: Incompressible vs. Perfect Gas Air Models
Replies: 0
Views: 1138

Incompressible vs. Perfect Gas Air Models

I'm running a CFD simulation on a system consisting of a few solids immersed in a box of air. There's a slow airflow through the box; some of the solids consume power. Elmer solves both the Heat equation and Navier-Stokes. I'm having problems with how the properties of Air are defined. If the materi...
by tibich72
14 Aug 2012, 00:59
Forum: ElmerSolver
Topic: Discrepancy in results based on air flow direction
Replies: 0
Views: 1283

Discrepancy in results based on air flow direction

I'm trying to simulate some 3D models of electronic components. One of the test cases is to have a small PCB board with a single component on top; the component should running pretty hot, at about 150C (based on measurements on the actual component). The simulation I'm using is creating the PCB and ...
by tibich72
09 Nov 2011, 18:51
Forum: External tools
Topic: Defining faces as physical surfaces in Salome
Replies: 20
Views: 12730

Re: Defining faces as physical surfaces in Salome

Hi Mike, I'm attaching the script that exports a mesh to Gmsh .msh format. The script also includes the parts that import the geometry, mesh it and declare groups based on it -- I haven't tested the export part without these steps, so thought it would be safer to include them too. As I've mentioned,...
by tibich72
02 Nov 2011, 11:53
Forum: External tools
Topic: Defining faces as physical surfaces in Salome
Replies: 20
Views: 12730

Re: Defining faces as physical surfaces in Salome

Hi Mike, The script is not a very general Salome -> .msh translation. I'm pretty much assuming that the mesh consists only of triangles for faces and of tets for volumes, and that each face and volume is a group (or, in Gmsh parlance, physical faces and physical volumes). For my purposes, this suffi...
by tibich72
27 Oct 2011, 21:15
Forum: External tools
Topic: Defining faces as physical surfaces in Salome
Replies: 20
Views: 12730

Re: Defining faces as physical surfaces in Salome

Hi Peter, one more result that might help you with debugging the UNV import. I've written a custom .msh mesh exporter to write the Salome mesh in Gmsh format, which can then be read by ElmerGrid. The exporter is a Salome script which works with Salome's internal data structures and not with any expo...
by tibich72
24 Oct 2011, 23:57
Forum: External tools
Topic: Defining faces as physical surfaces in Salome
Replies: 20
Views: 12730

Re: Defining faces as physical surfaces in Salome

Hi Peter, I found something that could be the issue. I've been looking through the source code (in release/6.0/elmergrid/src) at file femfilein.c, line 3964: /* should this be physical property or material property? */ data->material[noelements] = physind; OK, so first I've modified it to be matind ...
by tibich72
24 Oct 2011, 17:00
Forum: External tools
Topic: Defining faces as physical surfaces in Salome
Replies: 20
Views: 12730

Re: Defining faces as physical surfaces in Salome

Hi Matthias, Yes, the Windows version is not very stable, that's why we're considering using virtual Linux boxes on top of our Windows OS's to run Salome. As for identifying common faces/edges, Salome has the partition algorithm in there, that can identify these common faces -- after that, the mesh ...