하이브리드 CFD 기법을 이용한 파-물체 상호작용 문제의 수치 시뮬레이션

Abstract

In this study, wave-body interaction problem is numerically simulated using a efficient hybrid CFD scheme. In the developed scheme, Navier-Stoke(N-S) solutions are combined with potential-based solutions by introducing buffer zone. In the buffer zone, the near field solution from finite volume method with volume-of-fluid(VOF) scheme is gradually changed to potential-based solutions. Two different potential solutions are used in this study. First one is based on Stokes’ wave theory and second is based on fully nonlinear potential model which is solved by classical finite element method(FEM). Four different basic models including sphere, truncated cylinder, submerged cylindrical body and bottom- mounted cylinder are numerically investigated in regular/irregular or focusing wave conditions. In order to validate efficiency and accuracy of hybrid scheme, wave exciting forces and run-up from hybrid scheme are compared with experiments and potential-based solutions. Comparison results are fairly good to show the validity of present hybrid CFD scheme.