DEVELOPMENT OF NUMERICAL WAVE CHANNEL BY LBM WITH IMMERED BOUDARY METHOD AND ITS APPLICATION TO ESTIMATION OF WAVE FORCES ACTING ON A CAISSON BREAKWATER

Abstract

 A novel free surface numerical calculation scheme based on LBM and immersed boundary method is developed as the numerical wave channel. The method is applied to wave–structure interaction and estimation of wave forces acting on a compsite type breakwater. Wave–breakwater interactions such are wave overtopping and transmission, and wave forces on the breakwater are analyzed with the method. The numerical scheme is extended to seepage flows in the rubble foundation. The results of wave forces and wave pressure distribution calculated in the numerical wave channel agreed well with those of Goda's formula even in wave-breaking condition, confirming that the proposed numerical model has a high potential applicability to estimation of wave action toward complex shape of breakwaters.