>probably involve some kind of fast numerical fluid simulation Sometimes even a simple approach can work. On Apollo they developed (at the time cutting-edge) p

>probably involve some kind of fast numerical fluid simulation Sometimes even a simple approach can work. On Apollo they developed (at the time cutting-edge) passive RC filter networks, to avoid the control system "exciting" the rocket at frequencies of the slosh/bend/torsion modes. https://ntrs.nasa.gov/api/citations/19700023342/downloads/19700023342.pdf https://ntrs.nasa.gov/api/citations/19700023342/downloads/19... (search for "slosh" or "shaping network")