Here is an example of Multiphysics simulation software that we usually use for mechanical simulations.
EM and acoustic modules can be combined to make simulations for realistic calibration phantom design in terms of absorption issue and size determination an also FG positioning relative to US transducer or any other possible observation for calibration process as proofing tool.

https://www.comsol.com/video/piezoelectricsimulations-comsol-multiphysics

If we can find the way how to implement our system in to FEM model, ( boundary conditions , material props" medium", etc.) in order to make combined simulation "mechanical, EM, Acoustic "