파랑영역에서 해저 Manifold 구조물에 작용하는 유체력에 관한 CFD 시뮬레이션

Abstract

In this paper, numerical simulations were performed for the evaluation of hydrodynamic forces acting on subsea manifold templates in waves using a CFD package (Fluent V12). The Navier-Stokes equations were solved to simulate viscous flow around manifold-like structures with incoming waves. Numerical wave tank generating a regular progressive gravity wave was enabled by using a piston type wave maker at one end, while grid damper was adopted to remove reflected wave at the other end. The shape of a subsea manifold template was simplified as an assembly of two bars and some rods with rectangular cross sections. In the first, the wave load on one weather-side rod was compared with theoretical values based on Morison formula. In the second, the horizontal and vertical forces acting on eight templates with different number of rods were analyzed. Finally, the hydrodynamic coefficients non-dimensionalizing the peak values of simulated forces in the horizontal and vertical directions were shown with perforation ratio (porosity), respectively. around manifold-like structures with incoming waves. Numerical wave tank generating a regular progressive gravity wave was enabled by using a piston type wave maker at one end, while grid damper was adopted to remove reflected wave at the other end. The shape of a subsea manifold template was simplified as an assembly of two bars and some rods with rectangular cross sections. In the first, the wave load on one weather-side rod was compared with theoretical values based on Morison formula. In the second, the horizontal and vertical forces acting on eight templates with different number of rods were analyzed. Finally, the hydrodynamic coefficients non-dimensionalizing the peak values of simulated forces in the horizontal and vertical directions were shown with perforation ratio (porosity), respectively.