APPLICATION OF VOLUME OF FLUID INTERFACE TRACKING METHOD TO SIMULATION OFWATER IMPACT

In this paper, numerical simulations of water-entry of bodies are presented. Homogeneous flow model based on unsteady incompressible Reynolds-averaged Navier-Stokes equations was used to solve the flow field. Dual-time pseudo-compressibility method was employed to improve the computational efficiency of the solver. To investigate behavior of the water impact phenomenon, a VOF interface tracking algorithm known as the least squares volume-of-fluid interface reconstruction algorithm (LVIRA) is utilized to track the water-air interface. This approach uses the geometric information from the reconstructed interface and the velocity fields in each physical time step to update the volume fractions by solving the advection equation for water phase. The application to the computations of water impact of a hemisphere, two cones, and a wedge through free fall in one degree of freedom are performed. The free surface deformation, pressure coefficients, impact velocities and vertical accelerations during the impact are compared with available experiments and theoretical results. Good agreements with those results are obtained.