Wave-resolving simulations of viscous wave attenuation effects on Langmuir circulation
Wave-resolving simulations of viscous wave attenuation effects on Langmuir circulation
复制标题
粘性波衰减对朗缪尔环流影响的波解析模拟
DOI：
10.1016/j.ocemod.2020.101679
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发表时间：
2020
期刊：
影响因子：
3.2
通讯作者：
Yoshimasa Matsumura
中科院分区：
文献类型：
--
作者：
Yasushi Fujiwara;Yutaka Yoshikawa;Yoshimasa Matsumura
采用非静力自由面数值模式，对衰减表面波与下垫流的相互作用过程进行了显式模拟。该模型特别注意了能量和动量的数值守恒性质，能够准确地捕捉虚拟波应力的影响，虚拟波应力是一种从波到流的粘性动量转移。用本模型进行的简单实验表明，波分辨模拟中的朗缪尔环流比具有相应Stokes漂移廓线的Craik-Leibovich方程中的朗缪尔环流更强。Craik-Leibovich方程中的低估可以通过将衰减波到海流的动量传递处理为表面的虚拟波应力来修正。
Interaction processes of attenuating surface waves and underlying currents are explicitly simulated with a nonhydrostatic free surface numerical model. The model, designed with special attention to the numerical conservation properties of energy and momentum, is capable of accurately capturing the effect of the virtual wave stress, a viscous momentum transfer from waves to current. Simple experiments with the present model show that the Langmuir circulations in the wave-resolving simulations tend to be stronger than the ones in the Craik–Leibovich equation with corresponding Stokes drift profiles. The underestimation in the Craik–Leibovich equation can be corrected by addressing momentum transfer from attenuating waves to currents as the virtual wave stress at the surface.