Elmer Discussion Forum

They are boundary elements so if you do not target those boundaries in the sif file and impose boundary conditions on them they will be ignored by the solver. Same with bodies, if you do not create the body in the sif, a body in the mesh will be ignored.

This project couples magnetic force to displacement, although the magnetic field is not electrical induced
but you should be able to go from electrical field to magnetic field to mechanical force
https://github.com/mrkearden/magnet

After the refining by splitting, I recombined the triangles to quads, went 2nd order, and the all of the errors went away and a solution was obtained.

I would suspect mesh quality. I downloaded the files and ran as is and I received the numerous ERROR:: ElementMetric: Degenerate errors I did a refine by split 1 time in gmsh and that error went away I then received a non-convergence error ERROR:: ComputeChange: Numerical Error: Norm of solution app...

If your mesh is in the current directory and your number of cores specified for the solver is the same as the number of partitions then
Mesh DB "." "."

should be ok since your mesh is in the current directory.

using the ShoboxFsiEigen2d test case with Density = 2710.0 Youngs Modulus = 70e9 Poisson Ratio = 0.3 The beam frequency should be 87 Hz in air and 55 Hz in water with $ AirDensity = 1.0 $ SoundSpeed = 300 ElmerSolver reports EigenSolveComplex: EIGEN SYSTEM SOLUTION COMPLETE: EigenSolveComplex: Eigen...

The mesh location is specified in the header on the line Mesh DB "." "." This is at the top of the form in ElmerGUI setup. . . meaning current directory your mesh is in the current directory Your error.txt file reports The mesh will be partitioned with Metis to 2 partitions. mean...

I went to the test cases
HelmholtStructure
HelmholtStructure2
HelmholtStructure3

and change the density from 1 to 1000, and the sound speed from 300 to 1443.

In each one there was no difference in the structural result, but the pressure calculation changed.

and that is going to be impacted by mesh density, the finer the mesh the closer together they are. Think of the nodes as direct claculated values and the elemental as the average of all of the nodes. If the mesh is fine enough there is no difference, but it takes more computer solve the finer the me...