Search found 215 matches

by mark smith
10 Apr 2017, 16:19
Forum: ElmerSolver
Topic: heat & NS with phase change
Replies: 7
Views: 4603

heat & NS with phase change

Hi All, I have been trying heat + NS and phase change for a phase change material like paraffin wax, I used the excellent work posted by Julien Givernaud in post http://www.elmerfem.org/forum/viewtopic.php?f=3&t=3846&hilit=phase+change (thanks very much) with the appropriate material propert...
by mark smith
06 Apr 2017, 14:56
Forum: ElmerGUI
Topic: ELMER crash
Replies: 14
Views: 11512

Re: ELMER crash

Hi Antoine, Would you by any chance be doing a parallel solve with a partitioned mesh? I have had Elmer crash when writing out the vtu results if I am writing out the materials, if all the materials are not present in each of the partitions then this could happen at least in earlier versions. i you ...
by mark smith
30 Mar 2017, 23:16
Forum: ElmerSolver
Topic: Parallel solver settings on Windows machine
Replies: 7
Views: 6984

Re: Parallel solver settings on Windows machine

Hi TFLOPs,
Reporting it as a bug would not do any harm, my guess is most people use Elmer on Linux so it probably won't be a high priority for the Elmer team?
Regards
Mark
by mark smith
29 Mar 2017, 14:36
Forum: ElmerSolver
Topic: Parallel solver settings on Windows machine
Replies: 7
Views: 6984

Re: Parallel solver settings on Windows machine

Hi TFLOPs, You are not the only one to get the error "runtime error R6031 - Attempt to initialize the CRT more than once. This indicates a bug in your application." I have reported this before but have yet to find a solution, I can confirm that it doesn't always happen with a parallel solv...
by mark smith
23 Jan 2017, 16:53
Forum: ElmerSolver
Topic: navier stokes no-slip element normals
Replies: 11
Views: 7986

Re: navier stokes no-slip element normals

Hi Elmer team & users, In a coupled heat and fluid flow problem does the direction of the surface mesh normals matter? in particular and inlet surface, outlet surface and heat flux load surface? For no-slip surfaces Peter has already told me that the normal direction is unimportant, but what abo...
by mark smith
19 Jan 2017, 16:26
Forum: ElmerSolver
Topic: navier stokes no-slip element normals
Replies: 11
Views: 7986

Re: navier stokes no-slip element normals

Hi Matthias,
I have GiD & have used it for a number of years but it cannot produce boundary layer meshes other than having finer tet elements near the wall and bigger ones towards the core of the fluid.
I'll do some more research on Salome and try it out.
Regards
Mark
by mark smith
19 Jan 2017, 15:59
Forum: ElmerSolver
Topic: navier stokes no-slip element normals
Replies: 11
Views: 7986

Re: navier stokes no-slip element normals

Hi Matthias, Thanks for the link. Is Salome able to generate meshes for CFD/ conjugate heat transfer with prism boundary layers? What mesh engine does it use? I use Gmsh for simple geometries but I haven't found a way to generate CFD meshes with tet cores & prism boundary layers & pyramid tr...
by mark smith
18 Jan 2017, 23:20
Forum: ElmerSolver
Topic: navier stokes no-slip element normals
Replies: 11
Views: 7986

Re: navier stokes no-slip element normals

Hi Peter, Yes it may well be that there are duplicate sets of nodes at the interface and probably duplicate surface elements as well, are there any Elmer tools which can identify this sort of problem and remove them from the mesh. This appears to be a problem with pointwise meshing software when out...
by mark smith
12 Jan 2017, 19:08
Forum: ElmerSolver
Topic: navier stokes no-slip element normals
Replies: 11
Views: 7986

Re: navier stokes no-slip element normals

Hi Peter, I am evaluating pointwise as a mesher for elmer and have a mesh produced by one of their resellers for my tests. When a surface BC is defined for the no-slip surfaces I get a surface mesh whose normals point into the fluid, you also get a second BC group which is the wetted surface of the ...
by mark smith
10 Jan 2017, 18:58
Forum: ElmerSolver
Topic: navier stokes no-slip element normals
Replies: 11
Views: 7986

navier stokes no-slip element normals

In the flow solver does it matter which direction the element surface normals point for the no-slip BC ? if it does should they point into or out of the fluid?
Like wise for conjugate heat transfer at the interface between solid & fluid?

Thanks in advance
Mark