IMPROVEMENT OF IRREGULAR WAVE GENERATION METHOD AND APPLICATION OF TURBULENCE MODEL IN NUMERICAL WAVE FLUME

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  • 数値波動水路CADMAS-SURFにおける不規則波入力法の改良と乱流モデルの適用

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  In recent years, CADMAS-SURF is being applied to the numerical simulation of the structurally resistive design against wave action by using irregular waves and turbulence model due to performance advances of computers. Fujiwara (2008) proposed the improvement method for input horizontal velocity in order to address the numerical divergence and the increase of total water mass in the flume. However, this method is complex and unexpected free short and long waves may be generated. To address these problems, Sekimoto and Takahashi (2010) proposed a simple method of irregular wave generation using the uniform horizontal velocity profile. In these methods, the time series variation of a mass transport is not considered. And, the example of the application of turbulence model in CADMAS-SURF is few. In this paper, we proposed the improvement method of the conservation of the total water mass in the flume and confirmed that the generated irregular waves have good accuracy and the turbulence model in CADMAS-SURF is effective.

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