In order to calculate the viscous flow around a complex geometry, the three-dimensional viscous flow calculation method with overset grid is developed in the first report using grid embedding technique. In this paper, this method is adopted to the calculation of viscous flow around a hull with appendages (Low Viscous Resistance Fin, L. V. Fin). Reduction of ship resistance by attaching the L. V. Fin is simulated by this method. Influences of the load condition (draft) and the fin span on the effect of the L. V. Fin is discussed.