Simulating turbulent mixing caused by local instability of internal gravity waves

Simulating turbulent mixing caused by local instability of internal gravity waves
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模拟内部重力波局部不稳定引起的湍流混合

DOI:
10.1017/jfm.2021.119
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发表时间:
2021
影响因子:
3.7
通讯作者:
Dauxois Thierry
Dauxois Thierry
中科院分区:
工程技术2区
文献类型:
--
作者:
Onuki Yohei;Joubaud Sylvain;Dauxois Thierry

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为了评估海洋中的内波驱动混合,我们开发了一种直接数值模拟分层湍流的新技术。由于海洋内部重力波的空间尺度通常比湍流的空间尺度大得多,因此将两者完全纳入模型中需要很高的计算成本,因此超出了我们的范围。或者,我们切掉一个因未解析的大规模内波而周期性扭曲的小域,并局部模拟最小尺度的能量级联。在这个模型中,尽管这里获得的外波弗劳德数比之前报道的大大约两倍。
With the aim of assessing internal wave-driven mixing in the ocean, we develop a new technique for direct numerical simulations of stratified turbulence. Since the spatial scale of oceanic internal gravity waves is typically much larger than that of turbulence, fully incorporating both in a model would require a high computational cost, and is therefore out of our scope. Alternatively, we cut out a small domain periodically distorted by an unresolved large-scale internal wave and locally simulate the energy cascade to the smallest scales. In this model, even though the Froude number of the outer wave, obtained here are larger by a factor of about two than previously reported.
各向同性湍流实验室实验的直接数值模拟
DOI: --
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期刊:
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