Search found 19 matches

by mst31
Mon May 15, 2023 2:26 pm
Forum: FEM
Topic: PR 7100: FEM WB Elmer viscosity bug fix
Replies: 27
Views: 7041

Re: PR 7100: FEM WB Elmer viscosity bug fix

uwestoehr, thank you a lot of! I will try it.
by mst31
Mon Jan 30, 2023 9:41 am
Forum: FEM
Topic: PR 7100: FEM WB Elmer viscosity bug fix
Replies: 27
Views: 7041

Re: PR 7100: FEM WB Elmer viscosity bug fix

Thank you! New version of Elmer solved this issue.
by mst31
Sun Jan 29, 2023 3:06 pm
Forum: FEM
Topic: PR 7100: FEM WB Elmer viscosity bug fix
Replies: 27
Views: 7041

Re: PR 7100: FEM WB Elmer viscosity bug fix

Hello! Sorry for very long answer. Now I want to continue investigation of Elmer. But last version of FreeCAD (commit e188802ca6997d2564e7570ab648462e6a059f87) goes wrong trivially zero result. I tried my example that before worked fine. Also I created simple Flow example and it also has this proble...
by mst31
Sun Sep 18, 2022 9:45 pm
Forum: FEM
Topic: PR 7100: FEM WB Elmer viscosity bug fix
Replies: 27
Views: 7041

Re: PR 7100: FEM WB Elmer viscosity bug fix

And I updated my tube example:
https://github.com/mist90/FreeCAD-FEM-e ... y-3d.FCStd
Now it uses FC pressure condition. I increse inlet velocity so difference of pressure also increses and became appr. 0.8 atm.
by mst31
Sun Sep 18, 2022 6:42 pm
Forum: FEM
Topic: PR 7100: FEM WB Elmer viscosity bug fix
Replies: 27
Views: 7041

Re: PR 7100: FEM WB Elmer viscosity bug fix

Thank you for work! But I found mistake in your example: priority of heat equation above than flow equation so first heat equation calculated and then flow equation. But heat equation depends on velocity-field that calculated in flow equation. So temperature in your example is calculated for case wi...
by mst31
Thu Aug 04, 2022 7:52 pm
Forum: FEM
Topic: PR 7100: FEM WB Elmer viscosity bug fix
Replies: 27
Views: 7041

Re: PR 7100: FEM WB Elmer viscosity bug fix

Thank you for this information! So is really faster. I hope this will help me to create another model of natural convection.
by mst31
Tue Jul 26, 2022 9:23 pm
Forum: FEM
Topic: PR 7100: FEM WB Elmer viscosity bug fix
Replies: 27
Views: 7041

Re: PR 7100: FEM WB Elmer viscosity bug fix

Concerning the pressure, I meant a condition for the bulk pressure. I think one need to specify that the initial pressure of the water is in your example 1.0 bar and due to the heat it will be locally maybe 1.1 bar. However, I haven't had time yet to investigate how this is done that Elmer uses thi...
by mst31
Tue Jul 19, 2022 3:31 pm
Forum: FEM
Topic: [announcement] multi-threading for Elmer
Replies: 5
Views: 1876

Re: [announcement] multi-threading for Elmer

Thanks! I have tried to run multi-thread - all works. If I set one core in pereferences then Elmer runs one thread for assembling matrices stage and four threads for calculation stage (I have four thread CPU). If I set four cores then Elmer runs four threads on all stages. But there is error in pere...
by mst31
Tue Jul 12, 2022 6:05 pm
Forum: FEM
Topic: PR 7100: FEM WB Elmer viscosity bug fix
Replies: 27
Views: 7041

Re: PR 7100: FEM WB Elmer viscosity bug fix

You example file shows that Elmer is not using all CPU cores. I will have a look at this as well. I did and it was much more work than expected. Here is a PR that adds multi-thread support for Elmer: https://github.com/FreeCAD/FreeCAD/pull/7159 Thank you! I can also try to add Pressure Boundary Con...
by mst31
Tue Jul 12, 2022 6:01 pm
Forum: FEM
Topic: PR 7100: FEM WB Elmer viscosity bug fix
Replies: 27
Views: 7041

Re: PR 7100: FEM WB Elmer viscosity bug fix

uwestoehr wrote: Sat Jul 09, 2022 11:07 pm
Do you allow me to use this file as example directly for FreeCAD?
Yes of course