선회전 고정식 날개의 에너지절감 효과에 대한 수치해석적 평가기법연구

Abstract

The objective of the present paper is to study on a numerical method for the estimation of the energy saving performance of pre-swirl stators. The finite volume based RANS code, WAVIS is extended to analyze the interactions between a ship hull, pre-swirl stator, propeller, and rudder. The free surface is captured with the two-phase level-set method and body forces are used to model the effects of a propeller without resolving the detailed blade flow. The propeller forces are obtained using an unsteady lifting surface method based on a potential theory. The overset grid scheme is adopted for easy handling of the pre-swirl stator and rudder grid blocks. The realizable k-꺯 model is used for turbulence closure. A series of model tests has been carried out in the towing tank of MOERI. The resistance and propulsion tests results for a model ship with propeller and pre-swirl stator are compared with the numerical results for the validation of the present numerical approach.