CFD를 이용한 Planning hull 저항 및 항주 자세 추정

Abstract

Recently, the？demand and development of ？marine leisure industries for planning hull and leisure boat are increased significantly. The planning hull differs with the merchantship because the planning hull has hydrodynamic force about 50%~90% of all weight uphold the hull bottom. When the fuild flow through the planning hull bottom, the pressure in the bow and stern become different. The planning condition is started when the trim occurs where the bow rise inclined along the length direction of the boat. If we want to calculate the resistance of the planning hull, the trim and draft must be known in advance. There are many commercial softwares (i.e. Maxsurf, Orca 3D, ect) can be used to estimate the planning hull resistance and planning position, but most of them use the Savitsky empirical formula. In this paper, a new method is introduced. First, assume the planning position(trim and draft) and calculate the hull resistance by using CFD code. Next, change the trim and draft to make design point, and calculate the resistance for these point to obtain the response surface. Last, the optimization method is applied to estimate the planning hull resistance and planning position.