大型浮体構造物や大型没水構造物と相互干渉する表面波及び内部波の非線形数値計算

抄録

This paper describes i nteraction of surface/internal water waves with floating/submerged platforms by considering nonlinearity of fluid motion and flexibility of oscillating structures. The model represents a multilayer fluid system interacting with horizontally very large and elastic thin-plates, where the set of governing equations is derived by vertical integration in each fluid layer with nonlinear boundary conditions satisfied on the interfaces. Numerical computation is performed for surface/internal long waves and floating/submerged plate oscillations in the vertical section. Resonated pressures beneath a floating plate on the sea surface in a two-layer system are obtained in forced oscillation cases by taking into account different order of wave height to water depth ratios. In free oscillation cases surface and internal waves interacting with a floating or submerged plate structure are calculated. Progressing waves are also simulated under floating structures whose flexural rigidity changes spatially.