Discussion Forum

Hello, I'm trying to simulate resonating sound waves in a rabbit burrow for my lab. I've successfully done this with the poroelastic-solid-acoustic wave multiphysics setup, but this uses frequency domain. It would be extremely helpful for us to be able to watch the propogation of the wave, so I tried using a transient acoustic block in place of the frequency domain . This resulted in an extremely long simulation time and the file reaching sizes of several dozen gigabytes.

(File PourousBunnyTimeTrans.mph)

I figured this was due to either incorrect implementation of the transient block or the poroelastic module interaction being too complex, so I tried toning it down. Instead, I just did an acoustic-solid interaction multiphysics simulation accepting that I'd lose the added accuracy of modeling soil as a poroelastic material. This went well but didn't give "Sound Pressure" as a possible output to plot, which is what we'd been using to visualize resonance up till now.

file: BunnyTimeTrans.mph

I tried to get the sound pressure back by running a simulation with both the transient and the frequency domain components by using a modal transient analysis. This yielded the following error "Time-dependent equation residual vector is not supported for modal analysis."

file: BunnyTimeTransFreq.mph

Does anyone know how to fix this error, or a better way to simulate the scenario of a block of dirt with a cylinder of air in it being excited by a plane wave source from the top so that I view the propogation of the sound wave through the dirt and/or cylinder of air?

Thank you, Daniel Magley