Elmer Discussion Forum

Thanks for the quick reply. Run c) is a transient simulation, so dt shouldn't be zero, besides if Elmer is using the value of dt from the simulation b) (which is steady-state) since I execute the Solver "Before Simulation"? Compute Mesh Velocity = Logical False The problem is, that I do no...

Hi all, I have a problem with Mesh Velocities in the following setup: a) I do a surface relaxation run (mainly Navier-Stokes, MeshUpdate, FreeSurfaceSolver - I am not using the StructuredMeshMapper since this is an old project which was started earlier and I didn't wanted to switch in the middle), b...

Hi all, I'm not quite sure where the message fits in the forum (if it fits all), however I have some problems when browsing the Elmer code on sourceforge (I do that usually when I want to see what has changed in which revision). However, now, when I go on http://sourceforge.net/p/elmerfem/code/?sour...

Hei Yongmei, if your small surface velocities are elsewhere, I don't see a link between them and your sticky spots. I think it is perfectly possible that you find different solutions with the Robin method and the Adjoint method - it's different ways of doing the inversion and if you take third one, ...

Hi Yongmei, I'm not sure if I understand you correctly: If you have zero velocities in your observed velocities in fast-flowing areas I'd rather suspect that this an problem in your input data than a problem with your run. How else would you explain these slow points in the middle of your fast flowi...

Hi Denis, I do not know if Mesh2Mesh works in parallel, I remember a post in the forum which says "probably not". But I have never heart about a possibility to change the number of processors - even without changeing the mesh. If such a possibility exists, I would be happy to hear about it...

Hi Denis, what do you want to do? Just interpolating for postprocessing, restarting simulations on this finer mesh or only using certain variables in a new simulation? If you want to do a real restart there is a Mesh2Mesh Solver (I'm not sure about the exact name/spelling and can't find it in the do...

Hi Denis, if your MeshVelocities are zero and you have v_Bed > v_surf only in some points, them I'm running out of ideas :-). I'm not sure if it's possible that a steady-state velocity field exists (I guess you have calculated that), but no temperature steady-state. I'm a bit puzzled that your probl...

Hi Denis, just one quick thought, I had once troubles with advection and that was in the case of a relaxation run as you do. Did you check your Mesh Velocities after this relaxation? Did you set them to zero afterwards? There is a discussion somewhere here in the forum with input about these Mesh Ve...

Hi Denis, I didn't had exactly your problems, but I'll still share some quite some temperture-convergence-issus, maybe that inspires you. My steady-state temperature fields converges well in most cases, however it depends a lot on the initial conditions. Did you try different ones (for me the best i...