직사각형 격자계에서 표면이 명확히 정의된 3차원 부유체 주위 유동의 수치시뮬레이션

초록

Rectangular grid system has the advantage of easy treatment of a moving body. However, the body movement induces spurious pressure oscillation when the body boundary passes the grid line. In the present study, a numerical method is developed to reduce the spurious pressure and sharply define the body boundary. No-slip and divergence free boundary conditions are imposed as body boundary conditions. The velocity profile near the body boundary is assumed quadratic polynomial. Integrating the velocity profiles, a divergence of body boundary cell is obtained. The vortex induced vibrations on a elastically mounted circular cylinder are simulated to verify the present numerical method. The results are compared with other published data. Moreover, the motion and flow around an advancing Wigley hull in waves are numerically simulated and the results are compared with other experimental data. Green water on a FPSO is numerically simulated.