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Ocean Systems Engineering
  Volume 8, Number 2, June 2018 , pages 223-246

Water impact of three dimensional wedges using CFD
Vinod V. Nair and S.K. Bhattacharyya

    In this paper the results of CFD simulations, that were carried out to study the impact pressures acting on a symmetric wedge during water entry under the influence of gravity, are presented. The simulations were done using a solver implementing finite volume discretization and using the VOF scheme to keep track of the free surface during water entry. The parameters such as pressure on impact, displacement, velocity, acceleration and net hydrodynamic forces, etc., which govern the water entry process are monitored during the initial stage of water entry. In addition, the results of the complete water entry process of wedges covering the initial stage where the impact pressure reaches its maximum as well as the late stage that covers the rebound process of the buoyant wedge are presented. The study was conducted for a few touchdown velocities to understand its influence on the water entry phenomenon. The simulation results are compared with the experimental measurements available in the literature with good accuracy. The various computational parameters (e.g., mesh size, time step, solver, etc.) that are necessary for accurate prediction of impact pressures, as well as the entry-exit trajectory, are discussed.
Key Words
    CFD; water entry; water impact; wedge
Vinod V. Nair and S.K. Bhattacharyya: Department of Ocean Engineering, Indian Institute of Technology Madras, India

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