COMPUTATION OF FREE-SURFACE VISCOUS FLOWS AT MODEL AND FULL SCALE BY A STEADY ITERATIVE APPROACH
AuthorsRaven, H.C., Ploeg, A. van der, Starke, B.
Conference/Journal25th Symposium on Naval Hydrodynamics, St. John’s, Canada
Date8 Aug 2004
This paper describes progress in the development of a method to compute viscous flow with free surface around a ship hull. The method solves the steady RANS/FS problem by iteration, using the formulation proposed by Raven & Van Brummelen (1999). It is being developed to provide a more efficient alternative for the usual time-dependent solution approaches, in order to permit practical application on dense grids in ship design work. Applications are shown to a Series 60 hull at model and full scale; and to a tanker model. Computed scale effects on the wave pattern are confined to the stern wave system, as expected. Good agreement with experimental data is obtained; in particular, there is little sign of numerical wave damping even further from the hull. Computation times are quite modest. A theoretical analysis of the numerical accuracy is carried out. For the standard version of the method, this shows that it has a numerical damping of wave components which is of third order in the mesh size; and a second-order numerical dispersion. This explains the high accuracy found. Based on the analysis an alternative scheme is designed which further improves the accuracy.
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