NUMERICAL PREDICTION OF HYDROFOIL PERFORMANCE IN WAVE BY NURBS NUMERICAL WAVE TANK
; Department of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran
Mahmoud Ghiasi ; Department of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran
Time domain simulation using a Mixed Eulerian-Lagrangian (MEL) formulation and a high-order boundary integral method based on the Non-Uniform Rational B-spline (NURBS) formulation is employed to develop a Numerical Wave Tank (NWT). At each time step the Laplace equation is solved in the Eulerian frame and fully nonlinear free surface conditions are updated in the Lagrangian manner through a time marching scheme. Two damping zones are adopted at both ends of the tank to reduce the reflected wave energy. The fully nonlinear free surface simulations by different orders of B-spline basis functions in the NWT are examined through the volume, momentum and energy conservation. Hydrofoil performance in wave is considered for the practical application of the fully nonlinear NWT. Thrust and lift coefficients of a foil are computed and compared with the experimental data and other numerical solutions. Instantaneous forces and pressure distribution over the foil body are also computed.
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