  Scaled physical modeling is an important means to understand the behavior of
fluids in nature. However, a common source of errors is conflicting similarity
criteria. Here, we present using hypergravity to improve the scaling similarity
of gravity-dominated fluid convection, e.g. natural convection and multi-phase
flow. We demonstrate the validity of the approach by investigating water-brine
buoyant jet experiments conducted under hypergravity created by a centrifuge.
Results show that the scaling similarity increases with the gravitational
acceleration. In particular, the model best represents the prototype under N3g
with a spatial scale of 1/N and a time scale of 1/N2 by simultaneously
satisfying the Froude and Reynolds criteria. The significance of centrifuge
radius and fluid velocity in determining the accuracy of the scaled model is
discussed in the light of Coriolis force and turbulence. This study
demonstrates a new direction for the physical modeling of fluids subject to
gravity with broad application prospects.
