Discussion Forum

Danil,

you don't need pressure acoustics. The waves in the rock are modeled with solid mechanics.

Cheers Edgar

Edgar, thank you for your reply!

May I ask you please, how can I model waves with the solid mechanics?

In the solid mechanics section nothing is related to acoustics (please see the figure). Or I should do something differently?

Thank you!

If you excite the model in the frequency or time domain you will see the waves. Check the examples in the application library in Structural Mechanics > Elastic Waves. The time settings in the picture are only the output times of the solver. In wave problems you have to take care about proper time stepping in the solver. In most cases you need manual stepping and you cannot leave it to the solver to choose automatic stepping. Take care to use something like 10 steps per period and 6 mesh elements per wavelength. If you get a reasonable result you can try to relax that.

Dear Edgar, thank you very much for your help! I think I've managed to model wave propagation in my case.

I have one more question, please. The figure attached displayed two scenarios of pressure waves propagation in the aluminium body with a round cavity (results are shown for the same timestep).

Left figure - the round cavity is "empty", cavity created by operation "difference". Right figure - the round cavity is filled with the material (plastic).

However, the results are displaying this cavity as "empty" (not grey colour) for both scenarios. The wave response also looks similar.

The question is it should be like this, or my simulation is not working for "filled" cave for some reason?

Thank you!

Best regards, Danil

Danil,

it looks like the cavity is not part of the physics node. Check all assignments again. It is certainly possible to do what you want.

Cheers Edgar

Dear Edgar, thank you very much for your help! Now everything is working fine =) Best regards, Danil

Congratulations!