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We consider collective motion and damping of dipolar Fermi gases in thehydrodynamic regime. We investigate the trajectories of collective oscillations-- here dubbed ``weltering'' motions -- in cross-dimensional rethermalizationexperiments via Monte Carlo simulations, where we find stark differences fromthe dilute regime. These observations are interpreted within a semi-empiricaltheory of viscous hydrodynamics for gases confined to anisotropic harmonicpotentials. The derived equations of motion provide a simple effective theorythat show favorable agreement with full numerical solutions. To do so, thetheory must carefully account for the size and shape of the effective volumewithin which the gas' behavior is hydrodynamic. Although formulated for dipolarmolecules, our theoretical framework retains a flexibility to accommodatearbitrary elastic cross sections.

Viscous damping in weltering motion of trapped hydrodynamic dipolar Fermi gases