Large Eddy Simulations on the Configuration Design of Afterbodies for Drag Reduction

J. Ocean Eng. Technol. 2003;17(5):1-10.

PARK JONC-CHUN;KANG DAE-HWAN;CHUN HO-HWAN;

Department. of Naval Architecture and Ocean Engineering, Pusan National University;Department. of Naval Architecture and Ocean Engineering, Pusan National University;Department. of Naval Architecture and Ocean Engineering, Pusan National University;

저항감소를 위한 물체후방의 형상설계에 관한 LES 해석

박종천;강대환;전호환;

부산대학교 조선해양공학과;부산대학교 조선해양공학과;부산대학교 조선해양공학과;

핵심용어: Drag Reduction 저항감소, Configuration Design of Afterbodies 물체후방의 형상설계, Flow Separation 흐름의 박리, Large-Eddy Simulation LES, CFD 전산유체역학

Abstract

When a body with slant angle behind its shoulder is moving at a high speed, the turbulent motion around the afterbody is generally associated with the flow separation, and determines the normal component of the drag. By changing the slant angle of the afterbody, the drag coefficients can be changed, drastically. Understanding and controlling the turbulent separated flows has significant importance for the design of optimal configuration of the moving bodies. In this paper, a new Large Eddy Simulation technique has been developed to investigate turbulent vortical motions around the afterbodies, using slant angle. By understanding the structure of the turbulent flow around the body, the new configuration of afterbodies is designed to reduce the drag of body, and the nonlinear effects, due to the interaction between the body configuration and the turbulent separated flows, are investigated by use of the developed LES technique.