A localized turbulent mixing layer in a uniformly stratified environment
A localized turbulent mixing layer in a uniformly stratified environment
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均匀分层环境中的局部湍流混合层
DOI：
10.1017/jfm.2018.400
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发表时间：
2018
影响因子：
3.7
通讯作者：
Matsuda Keigo
中科院分区：
文献类型：
--
作者：
Watanabe Tomoaki;Riley James J.;Nagata Koji;Onishi Ryo;Matsuda Keigo
本文用稳定分层剪切层的直接数值模拟方法研究了均匀分层环境中由非湍流流动约束的局部湍流。特别令人感兴趣的是湍流/非湍流界面（TNTI）层，这是通过识别湍流区的位涡来检测的。湍流区外缘附近的流体获得位涡，并通过粘性和分子效应引起的扩散而变得湍流。TNTI层附近的流动特性的变化取决于界面附近的浮力雷诺数，TNTI层附近，这是小于湍流核心区域内的值。在非湍流区域传播的内部重力波的印记被发现在TNTI层内的涡度，推断湍流和内部重力波之间的相互作用。的波能通量导致的净损失的动能在湍流的核心区域有界的TNTI层，和内部重力波从湍流区域提取的动能的量是相当的湍流区域中耗散的量。
Localized turbulence bounded by non-turbulent flow in a uniformly stratified environment is studied with direct numerical simulations of stably stratified shear layers. Of particular interest is the turbulent/non-turbulent interfacial (TNTI) layer, which is detected by identifying the turbulent region in terms of its potential vorticity. Fluid near the outer edge of the turbulent region gains potential vorticity and becomes turbulent by diffusion arising from both viscous and molecular effects. The flow properties near the TNTI layer change depending on the buoyancy Reynolds number near the interface, near the TNTI layer, which is smaller than the value deep inside the turbulent core region. An imprint of the internal gravity waves propagating in the non-turbulent region is found for vorticity within the TNTI layer, inferring an interaction between turbulence and internal gravity waves. The wave energy flux causes a net loss of the kinetic energy in the turbulent core region bounded to the TNTI layer, and the amount of kinetic energy extracted from the turbulent region by internal gravity waves is comparable to the amount dissipated in the turbulent region.
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影响因子：
8.6
作者：
M. Holzner;B. Lüthi
通讯作者：
M. Holzner;B. Lüthi
DOI：
10.1137/0913035
发表时间：
1992-03-01
期刊：
SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING
影响因子：
--
作者：
VANDERVORST, HA
通讯作者：
VANDERVORST, HA
影响因子：
3.7
作者：
Andrea Maffioli;P. Davidson;S. Dalziel;N. Swaminathan
通讯作者：
N. Swaminathan
强分层粘性流体中薄饼涡的垂直长度尺度选择
影响因子：
3.7
作者：
R. Godoy;J. Chomaz;P. Billant
通讯作者：
P. Billant
影响因子：
3.7
作者：
D. Krug;M. Holzner;I. Marusic;M. van Reeuwijk
通讯作者：
M. van Reeuwijk