Search found 3488 matches

by raback
Today, 11:36
Forum: General
Topic: Application fields of Elmer
Replies: 29
Views: 33623

Re: Application fields of Elmer

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
by raback
Yesterday, 19:52
Forum: ElmerSolver
Topic: Acoustics Simulation (from Comsol to Elmer)?
Replies: 35
Views: 645

Re: Acoustics Simulation (from Comsol to Elmer)?

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...
by raback
Yesterday, 19:46
Forum: ElmerSolver
Topic: Parallel DataToFieldSolver
Replies: 1
Views: 95

Re: Parallel DataToFieldSolver

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...
by raback
11 Nov 2019, 18:34
Forum: ElmerSolver
Topic: Acoustics Simulation (from Comsol to Elmer)?
Replies: 35
Views: 645

Re: Acoustics Simulation (from Comsol to Elmer)?

Hi

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

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

-Peter
by raback
11 Nov 2019, 14:10
Forum: ElmerGUI
Topic: about paraview
Replies: 3
Views: 326

Re: about paraview

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 ...
by raback
08 Nov 2019, 14:01
Forum: ElmerSolver
Topic: Acoustics Simulation (from Comsol to Elmer)?
Replies: 35
Views: 645

Re: Acoustics Simulation (from Comsol to Elmer)?

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
by raback
07 Nov 2019, 21:38
Forum: ElmerSolver
Topic: Acoustics Simulation (from Comsol to Elmer)?
Replies: 35
Views: 645

Re: Acoustics Simulation (from Comsol to Elmer)?

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
by raback
07 Nov 2019, 21:26
Forum: ElmerSolver
Topic: Acoustics Simulation (from Comsol to Elmer)?
Replies: 35
Views: 645

Re: Acoustics Simulation (from Comsol to Elmer)?

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...
by raback
07 Nov 2019, 17:39
Forum: ElmerSolver
Topic: calculation mechanical force of motor
Replies: 1
Views: 95

Re: calculation mechanical force of motor

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
by raback
07 Nov 2019, 17:32
Forum: ElmerSolver
Topic: Acoustics Simulation (from Comsol to Elmer)?
Replies: 35
Views: 645

Re: Acoustics Simulation (from Comsol to Elmer)?

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...