Elmer Discussion Forum

Hi Marco,

If you have conforming periodic BCs. Then you could look for recent developments with "Conforming BC". Perhaps you can open a thread on this to discuss in more detail.

-Peter

Hi The periodic BCs look fine to me. Additionally you have to define the fields to be periodic. There is also rather new "Conforming BC" condition. The difference is that "Periodic BC" involve constraint matrix and result to harder-to-solve linear system whereas "Conforming BC" operate as if the nod...

Hi Currently not. It may do something almost sensible since all partitions do the same thing. What would be easy, is to skip data that is not in given partition. The problems could be at the interfaces since it would require some MPI communication to not have duplicate hits. How important this is de...

Hi

Currently no PML. Its on the waiting list...

For values at specific point (line) look at SaveScalars (SaveLine) module.

-Peter

Hi I'll only take up one observation: you're missing the MeshSolver that is needed to extend the elastic displacements into the fluid domain. The mesh velocity is then used in the ALE formulation for the N-S. Otherwise you cannot have consistent formulation. Check the test case "ArteryOutlet" (even ...

Hi Panos,

CAD drawings are often in units of mm. Hence if you otherwise work with SI units this will cause problems. Scaling indeed fixes this.

-Peter

Hi

To add, whether you want to model the plastic parts is up to you. It seems that the sound propagates there too. Probably less with the higher frequencies.

-Peter

Hi If you want to describe a sinusoidal wave with polynomial basis functions you need easily around ten elements for each wave. I checked that the size of your system was ~4 x 8 m^2, and you had 16 k triangles. Just counted in my head that it rougly equates in having 250 rectangles per m^2 and hence...

Hi

Maybe you could share the mesh.

You seem to have quite many BCs set to zero. Combined with the fact that you in many places have only one elememt layer this seems rather limiting.

-Peter

Hi You had only one major problem in your sif: the frequency was 40 kHz resulting to wavelength of ~9 mm. On the other hand your characteristics mesh size is ~7 cm. Hence you cannot capture the sinusoidal waves. With standard FE you need easily 10 elements for wavelength. This of course limits the w...