基于SPH方法双消浪室开孔沉箱数值研究

Numerical study of double-layered perforated caisson based on SPH method

基于修正光滑粒子法(CSPM)和黎曼解修正后的光滑粒子流体动力学(SPH)方法,建立模拟波浪与开孔沉箱相互作用的数值水槽模型,通过理论解和数值结果对比,验证其准确性。研究消浪室相对宽度B/L、相对波高H/L、相对水深d/L因素对双消浪室开孔沉箱的反射系数Kr以及静水位处所受的波压力p的影响,并对水粒子出入消浪室复杂的过程进行研究。结果表明,在研究工况下,消浪室相对宽度B/L与波压力p呈现非线性关系,反射系数Kr随着消浪室相对宽度B/L增加而减小;相对波高H/L对波压力p和反射系数Kr影响较小;随着相对水深d/L增加,波压力p逐渐减小,反射系数Kr表现为先减小后增大的非线性特征。前消浪室水粒子相对后消浪室运动情况更为剧烈,水平速度较垂直速度变化较大,在开孔位置附近水粒子速度变化明显。

Based on the smoothed particle hydrodynamics(SPH)method modified by corrective smoothed particle method(CSPM)and Riemann solutions,a numerical flume model is built to simulate the interaction between waves and perforated caisson,and the accuracy is also verified by comparing theoretical solutions with numerical results.The influences of the reflection coefficient K r of perforated caisson with double-layered and the wave pressure p of static water level are studied from the factors of relative width B L,relative wave height H L and relative water depth d L.The complicated process of water particles entering and leaving the wave dissipation chambers is also studied.The results show that there is a nonlinear relationship between the relative width B L and the wave pressure p under the research conditions,and the reflection coefficient K r decreases with the increase of the relative width B L.Relative wave height H L has little effect on wave pressure p and reflection coefficient K r.With the increase of the relative water depth d L,the wave pressure p gradually decreases,and the reflection coefficient K r shows a nonlinear characteristic of decreasing first and then increasing.The motion of water particles in the front chamber is more intense than that in the back chamber,the horizontal velocity changes more than the vertical velocity,and the water particle velocity changes obviously near the perforated position.