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Publications
Datta, R., Guedes Soares, C. and Rodrigues, J.M. (2014) , “A time domain panel method for the prediction of nonlinear hydrodynamic forces”, Proceedings of the 11th International Conference on Hydrodynamics (ICHD 2014), 19-24 October, Singapore, Singapore
Prediction of nonlinear wave forces within engineering accuracy is one of the most challenging topics in the domain of numerical ship hydrodynamics for many years. In the present work, a time domain panel code is extended to deal with large amplitude motions by incorporating non-linear representations of the hydrostatic and Froude-Krylov forces. The formulation is based on earth fixed co-ordinate system using transient free surface Green’s function. The wetted surface is re-defined at each time step and a suitable algorithm is developed to predict the free surface and to remesh the wetted surface. The hydrostatic and Froude-Krylov forces are then calculated on exact wetted surface. However, the waves are generated using linear wave theory. To determine the robustness and efficiency of the newly developed nonlinear code, rigorous numerical results are obtained and are validated with published results. The fk- forces are obtained with increasing wave amplitude. The study shows that the non linear effects are important in case of large amplitude wave and effects are very clearly visible.
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