Numerical simulation of wave damping over porous seabeds
Numerical simulation of wave damping over porous seabeds
复制标题
多孔海底波浪阻尼的数值模拟
DOI：
10.1016/j.coastaleng.2006.05.003
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发表时间：
2006-09-01
影响因子：
4.4
通讯作者：
Lin, Pengzhi
中科院分区：
文献类型：
--
作者：
Karunarathna, S. A. S. A.;Lin, Pengzhi
本文利用二维数值模型研究了多孔海床上的波浪衰减问题。在该模型中，多孔介质外的流动用雷诺平均的N-S方程来描述。推导并实现了渗流的空间平均Navier-Stokes方程，其中考虑了附加惯性和非线性摩擦力的存在。与以前的模型不同，本模型显式地表达了流动阻力对雷诺数的依赖关系，以便覆盖更大范围的多孔流动。利用已有的理论和实验数据对数值模型进行了验证。数值结果与理论结果的比较表明，渗流模型中非线性阻力项的省略或线性化是大多数分析模型中的普遍做法，会导致估计波浪阻尼率的显著误差。用该数值模型模拟了非线性波浪与多孔海床的相互作用。结果表明，对于不同的波非线性，数值计算结果与实验结果吻合较好。此外，还进行了数值试验，研究了波长、海床厚度和雷诺数对波浪衰减的影响。(C)2006爱思唯尔B.V.保留所有权利。
This paper presents a study of wave damping over porous seabeds by using a two-dimensional numerical model. In this model, the flow outside of porous media is described by the Reynolds Averaged Navier-Stokes equations. The spatially averaged Navier-Stokes equations, in which the presence of porous media is considered by including additional inertia and nonlinear friction forces, is derived and implemented for the porous flow. Unlike the earlier models, the present model explicitly represents the flow resistance dependency on Reynolds number in order to cover wider ranges of porous flows. The numerical model is validated against available theories and experimental data. The comparison between the numerical results and the theoretical results indicates that the omission or linearization of the nonlinear resistance terms in porous flow models, which is the common practice in most of analytical models, can lead to significant errors in estimating wave damping rate. The present numerical model is used to simulate nonlinear wave interaction with porous seabeds. and it is found that the numerical results compare well with the experimental data for different wave nonlinearity. The additional numerical tests are also conducted to study the effects of wavelength, seabed thickness and Reynolds number on wave damping. (C) 2006 Elsevier B.V. All rights reserved.