完全非线性波浪破碎模型沿岸流数值模拟

探讨一种基于完全非线性Boussinesq方程的波浪破碎模型在沿岸流计算中的应用问题。针对控制方程中的完全非线性项对沿岸流成长过程的影响进行了深入讨论。数学模型计算结果表明,完全非线性项有使平均流局部化的作用;通过数模实验还发现,垂向高阶涡度项可以有效抑制破波区外回流;运用Visser的实验室沿岸流实测资料从沿岸流速度、波高和平均水位几方面对所提模型进行了验证,并给出了紊动参数的计算结果。

Numerical simulation of longshore current by using a fully-nonlinear breaking wave model

A numerical wave breaking model based on the fully-nonlinear Boussinesq equations is investigated in terms of its application in calculation of longshore current.The growing process of the longshore current affected by the fullynonlinear terms is also investigated through numerical tests,which indicates that the fully-nonlinear terms may induce localization of the mean current.It is also found from the numerical tests that the addition of high order vorticity terms in the governing equations can significantly reduce the backward flow circulation outside the surf zone.Modeled results of longshore currents,wave heights and mean water levels are verified by Visser's laboratory data.