Reply To: How to get a material moving?
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Unfortunately fluid structure interaction is not as simple as making a material-number-described region fall down. Material numbers are only a proxy used to refer to certain subsets of cells for e.g. assigning per-cell dynamics.
For simulating the sedimentation of a solid circle in a non-free-surface context you can check out e.g. the particles/dkt2d
example case. This case uses our HLBM-based resolved particle code to simulate the common “drafting-kissing-tumbling” behavior of two spheres (immersed in a fluid) being pulled down by gravity. After that the next step would be to develop e.g. some kind of combined HLBM-FreeSurface model.