Wave Interaction Of Partially Immersed Semicircular Breakwater Suspended On Piles Using Flow-3D

This paper experimentally investigates the wave transmission through partially immersed semicircular breakwater suspended on two rows of circular piles. Different wave and structure parameters have been investigated such as; incident wave height, wave length, wave period, breakwater draft and the clear gap between the supporting piles. Multiple Polynomial Regression (MPR) model is used to develop an empirical equation to calculate the transmission coefficient (kt) as a representative of the transmitted wave energy. In addition, a Flow-3D numerical study is carried out to simulate the transmitted wave hydrodynamics and verified against the experimental results. The numerical analysis shows good agreement with experimental results with an acceptable value of NRMSE. The results show that the transmission coefficient (kt) decreases by about 31% with increasing the relative wave length from 0.12 to 0.22 and wave steepness from 0.006 to 0.021. Also, the transmitted coefficient (kt) decreases by about 25% with increasing the relative immersion depths from 0.25m to 0.5m and increases by about 16% for increasing of pile porosity value from 0.5 to 0.83 respectively.