ABSTRACT

This paper presents viscous flow simulation around a Wigley ship running in incident waves. One of the authors has been developing a CFD code SURF, which solves the Navier-Stokes equations in unstructured grid system with pseudocompressibility assumption. In the present work, we modify the code to compute the flows around ship running in the incident waves. Also in order to treat ship motions, we introduce moving grid system into SURF. One of advantages to solve viscous flows of incident wave problem is to evaluate viscous flow field around propeller. Then numerical results and discussions are done.

INTRODUCTION

In order to evaluate propulsive performance of ships in actual seas, an estimation of flows around a ship running in incident waves is required. Although many works related to the problems have been carried out, they are mostly based on a potential flow theory, for instance see [1],[2], therefore one cannot estimate viscous flow field, which is essential for the prediction of the propulsive performance. So far, the researches on the propulsive performance have been carried out mainly through the experiment [3],[4], they show that when the ship is running in waves, the mean velocity coming into the propeller plane increases comparing with that the ship runs in still water. This fact is very interesting to consider the propulsive performance in waves and in this sense, we can recognize that the evaluation of the viscous flows around ship in waves is important. One of the authors has been developing a CFD code SURF [5], [6], which solves the Navier-Stokes equations in unstructured grid system with pseudo-compressibility assumption, because an unstructured grid method has great advantage to solve flows around a complex form. In SURF, expression of the free surface is based on a level set method, one of the interface capturing methods.

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