비정상 포텐셜 유동의 패널법 해석에서 포텐셜의 2차 미분값의 수치계산

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 14; no. 3; pp. 41 - 45
• Main Authors: 양진호(JIN-HO YANG), 전호환(HO-HWAN CHUN)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2000
• Subjects: Rankine source method 랜킨소오스법; Extrapolation 외삽법; Double body 이중모형; Low order panel method 저차패널법; 2nd derivative of potential 포텐셜의 2차 미분; Unsteady flow analysis 정상 유동해석; 2
• ISSN: 1225-0767; 2287-6715

In solving the unsteady potential flow problem of the ship in waves with the panel method, in general one can consider the basic flow as the free stream or double body solution. For the double body solution, the body boundary condition has the 2nd derivatives of the velocity potential. Low order panel methods are known to suffer from the significant error in the 2nd derivatives computed at the body surface. This paper analyzes the numerical error in the 2nd derivatives for a 2-D cylinder and a 3-D sphere problem, and an extrapolation method to obtain the correct derivatives on the body surface is suggested.