Elmer Discussion Forum

wetcase2.sif That final plot was actually from spreadsheet. To get to spreedsheet I go into paraview. You can actually plot nodal data as a function of step directly in paraview. Using interactive select node and then plot selected data over time. But if I want to have better control or plot result...

I tested the beam case in transient by tweaking the top of the beam the letting it vibrate freely. I used the FSI obstacle tutorial as a guide.
The magnitude of the motion in water is much different than in air, but the frequency is unchanged. So FSI means loading only not mass.

For the HelmHoltz Structure case https://github.com/ElmerCSC/elmerfem/tree/devel/fem/tests/HelmholtzStructure I test a beam in fluid, 2D, the frequency should be 81 Hz in air with fluid properties of air the frequency is 84.9 Hz with fluid properties of water the frequency is 84.9 Hz, it should be l...

I put a load on it so that there would be a solution. Then I ran it with and with out the pre strain. There was no change in the answer.

I redid the transient damping test with displacement BC instead of load force, and the results look reasonable. it vibrates after being let go.

It looks like progress. The most help is available if you can post a complete case, sif and mesh. And ask questions around that. I use github to post mine.

Not necessarily a related case, but an example of a github repository

https://github.com/mrkearden/harmonic_response

I would have to test if doing by restart allows you to change boundary conditions. Otherwise there are conditional boundary conditions Displacement 1 = Real 0.0 Displacement 1 Condition = Real $condx When $condx > 0, the condition is enforced, when $condx < 0, not So perhaps Displacement 1 = Real 0....

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Chapter 3 https://www.nic.funet.fi/pub/sci/physics/elmer/doc/ElmerSolverManual.pdf You have to tell Elmer to save the restart file in the first analysis. I have done this with transient, in 1 solution, have not tried it in restart. In transient I apply the load for x amount of time, then let it go. ...