APPLICABILITY OF OpenFOAM TO THE VELOCITY OF RUBBLE MOUND OVERTOPPING

Abstract

 It is a problem that the rubble mound is damaged if high waves such as typhoons attack during construction of the rubble mound seawall. It is thought that the velocity above the crest is important for the stability assessment of the rubble mound. In this study, the applicability of OpenFOAM was examined in order to evaluate the velocity above the rubble mound crest. The rubble mound is reproduced as a porous body. The hydraulic model test and the numerical analysis results were compared, and good reproducibility was obtained from the initial waveform by reproducing the motion of the wave generator in the experiment. Moreover, it has become clear that it is important to set the porosity of the rubble mound. Sufficient accuracy was obtained for the flow velocity that is essential for the stability assessment of rubble mound. And, the water level inside the rubble mound was also reproduced. Furthermore, in order to evaluate the damage process of the rubble mound, it became clear that the examination by the irregular wave is necessary instead of the regular wave.