하이브리드 기법을 이용한 고정된 해양구조물에 작용하는 파랑하중에 관한 수치 시뮬레이션

Abstract

In this paper, diffraction problems of fixed offshore structures is solved by using a hybrid scheme. In the hybrid scheme, potential-based solutions and Navie-Stokes-based finite volume method (FVM) with volume-of-fluid(VOF) method are combined. We introduce a buffer zone for efficient wave-making and damping. In the buffer zone, the near field solution from FVM-VOF is gradually changed to Stokes 2nd order wave solutions. Three different models including truncated cylinder, sphere, and wigleyIII model are numerically investigated in regular wave with wave steepness 1/30. Efficiency and accuracy of hybrid scheme are numerically validated from the results using different domain sixe and buffer zone. Wave exciting forces from the FVM-VOF simulations are compared with potential-based solutions from higher-order boundary element method(HOBEM). Comparison shows good agreement between hybrid scheme and potential-based solutions.