A numerical simulation to investigate the water entry of half-half sphere which is hydrophobic on one hemisphere and hydrophilic\non the other is performed. Particular attention is given to the simulation method based on solving the Navier-Stokes equations\ncoupled with VOF (volume of fluid) method and CSF (continuumsurface force) method.Numerical results predicted experimental\nresults, validating the suitability of the numerical approach to simulate the water entry problem of sphere under different wetting\nconditions. Numerical results show that the water entry of the half-half sphere creates an asymmetric cavity and ââ?¬Å?cardioidââ?¬Â splash,\ncausing the sphere to travel laterally fromthe hydrophobic side to the hydrophilic side. Further investigations show that the density\nratio and mismatch of asymmetric in wetting condition affect the trajectory, velocity, and acceleration of the half-half sphere during\nwater entry. In addition, the total hydrodynamic force coefficient is investigated as a result of the forces acting on the sphere during\nwater entry dictated by the cavity formation.
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