Search found 9 matches

by Paul2015
24 Apr 2018, 20:36
Forum: ElmerSolver
Topic: Turbulent flow at high Reynolds number - Convergence problem
Replies: 19
Views: 12365

Re: Turbulent flow at high Reynolds number - Convergence problem

Dear Kumar, dear all, I will try a simple case : an air flow in an elbow with free outlet. I have already tried a 2D case and I had no problem to converge with an air velocity inlet of 20 m/s. I will now test higher velocities. The solver parameter were about those you mentionned upper in your examp...
by Paul2015
24 Apr 2018, 11:41
Forum: ElmerSolver
Topic: Turbulent flow at high Reynolds number - Convergence problem
Replies: 19
Views: 12365

Re: Turbulent flow at high Reynolds number - Convergence problem

Dear Kumar, Thanks a lot to your very detailed post. I really appreciate... Indeed, my last tests showed me that it was possible, under some conditions (especially what you specify about the solver (I based my work on the linked test case in one of my previous posts)) to reach relatively high Reynol...
by Paul2015
19 Apr 2018, 11:32
Forum: ElmerSolver
Topic: Turbulent flow at high Reynolds number - Convergence problem
Replies: 19
Views: 12365

Re: Turbulent flow at high Reynolds number - Convergence problem

@Matthias : Yes, that's what I did, of course... ;) I'm just reporting this "bug"... Anyway, the main objective of this thread is to discuss about the solver settings and configuration in view to obtain convergence of turbulent, relatively high Reynolds number flows. I've found these examp...
by Paul2015
18 Apr 2018, 22:11
Forum: ElmerSolver
Topic: Turbulent flow at high Reynolds number - Convergence problem
Replies: 19
Views: 12365

Re: Turbulent flow at high Reynolds number - Convergence problem

Dear all, 2 very interesting cases : http://www.elmerfem.org/forum/viewtopic.php?f=3&t=539 http://www.elmerfem.org/forum/viewtopic.php?f=3&t=4925 I already test the 2nd one and I will test the 1st one... and the test case FEM/Tests/Diffuser_SST A lot of interesting information in these cases...
by Paul2015
18 Apr 2018, 15:19
Forum: ElmerSolver
Topic: Turbulent flow at high Reynolds number - Convergence problem
Replies: 19
Views: 12365

Re: Turbulent flow at high Reynolds number - Convergence problem

Dear Peter, dear all, May be I could reformulate my question in another way. What solver configuration do you recommend in view to treat, for example, these 2 tutorials with higher air inlet velocity (for start, we can take an air inlet at 10 m/s for example in each case) ? - In 2D, the turbulent in...
by Paul2015
18 Apr 2018, 12:39
Forum: ElmerSolver
Topic: Turbulent flow at high Reynolds number - Convergence problem
Replies: 19
Views: 12365

Re: Turbulent flow at high Reynolds number - Convergence problem

Dear Matthias, Thank you for your reply. The Turbulent Prandtl number appears, for instance, in "Material/SST k-omega/Properties", without activating the heat equation. Once you activated a turbulent equation, and choose the material, it is taken into account in the model and written in th...
by Paul2015
18 Apr 2018, 11:26
Forum: ElmerSolver
Topic: Turbulent flow at high Reynolds number - Convergence problem
Replies: 19
Views: 12365

Re: Turbulent flow at high Reynolds number - Convergence problem

Dear Peter, Thanks a lot for your reply. Actually, this is what I thought (and what I feared...). Anyway, I think that it is possible to simulate flows at higher Reynolds number by taking some specific precautions. Since I initiated this thread, I've found some examples in this forum that shows that...
by Paul2015
16 Apr 2018, 10:56
Forum: ElmerSolver
Topic: Turbulent flow at high Reynolds number - Convergence problem
Replies: 19
Views: 12365

Re: Turbulent flow at high Reynolds number - Convergence problem

Hello, To extend my question most generally, is there some limitations for high Reynolds simulation with Elmer ? If not, did someone of you already carry out some simulations at high Reynolds (typically in air at high velocity) and what were the specificities of your model/solver parameters to conve...
by Paul2015
13 Apr 2018, 10:48
Forum: ElmerSolver
Topic: Turbulent flow at high Reynolds number - Convergence problem
Replies: 19
Views: 12365

Turbulent flow at high Reynolds number - Convergence problem

Dear All, First of all, thanks a lot to Elmer developers and community members for this efficient tool. I am a CFD user since more than 25 years and I have a significant experience in OpenFoam. My goal, by using Elmer, is to simulate conjugate heat transfer or acoustics, in view to complete OpenFoam...