Treatment of the free surface boundary conditions in PARNASSOS

摘要

In this paper we use the iterative method described in (Raven, van der Ploeg, Starke, 2004) to compute the steady viscous flow around a ship including the free surface. For completeness, a brief description of this method is presented in Section 2. In (Raven, van der Ploeg, Starke, 2004) it has been shown that the computational results agree very well with measurements even at a distance from the hull, not only for slender ships like the Series 60, but also for fuller ships like tankers. In (Starke, van der Ploeg, Raven, 2005) it has been shown that the method gives good results also for transom-stern vessels. The method was found to solve the steady free-surface ship viscous flow problem very efficiently. For example, for the Series 60 C_b=0.6 at model scale Reynolds number Rn=3.4x10~6 and Froude number Fn=0.316, the required CPU-time for the RANS/FS computation on a mesh with 1.75M nodes using a PC with a single Intel Pentium IV 2.4 GHz processor is 20 hours.