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.
Contact
Auke van der Ploeg
CFD Researcher
Bram Starke
CFD Researcher
Tags
sustainable propulsioncfd developmentcfd/simulation/desk studiesresistance and propulsionmonitoringresearch and developmenthull form optimisationfull scaleresearch