Adaptive Grid Refinement Applied to RANS Ship Flow Computation

28th Symposium on Naval Hydrodynamics – Pasadena, California, 12th-17th September 2010

An adaptive grid refinement method has been developed for the FINE™/Marine flow solver. The method is fully integrated in the flow solver and is meant to be used for all the different fields of application of this RANS solver. Therefore, the method is made to be as general, flexible and robust as possible, to enable directional refinement, unstructured grids, and fully parallelised computation. The evaluation of the refinement criterion is made such, that refinement criteria can be easily exchanged.

In this paper, the refinement method is applied to two highly different test cases, to show its versatility. In the first test, the double-model flow around the KVLCC2 tanker, pressure-based refinement criteria are used to create a locally refined grid from a very coarse initial grid.

Results in the propeller plane indicate that good accuracy is obtained with significantly less cells than on fine grids made by hand. The second test case is the HALSS fast trimaran concept. For this case, parameter studies are first performed on non-refined grids, in order to determine the influence of the outer hull positions and the centre hull skeg design. Grid refinement around the position of the water surface is then applied to selective cases in order to get a clearer view of the wave field generated; these results allow us to confirm the conclusions from the parameter study.

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