Numerical simulation of underwater Ellipsoid motion near free surface

To analyze hydrodynamic characteristics of small scale body motion near free surface, finite volume method was adopt to compute incompressible Reynolds Averaged N-S (RANS) equations, numerical methods were conducted to simulate changes of drag coefficient and surface shape when moving near free surface. VOF method with Geo-Reconstruct form was used to deal with free surface. Fully developed turbulent flow can be solved by RNG k-epsilon model, and near wall region by near-wall functions. Quick upwind schemes were used to overcome instability problem when simulating high Reynolds flow. The results showed that VOF method, combined with RNG k-epsilon model, can be put to use to numerically simulate underwater body moving near free surface, and catch shape change of free surface in high Froude number.