Energy cascade and vortex structure in turbulent channel flow
Energy cascade and vortex structure in turbulent channel flow
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湍流通道流中的能量级联和涡结构
DOI：
10.11188/seisankenkyu.71.5
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
半場 藤弘
中科院分区：
文献类型：
--
作者：
半場 藤弘;稲垣 和寛;半場 藤弘
利用槽道湍流的DNS数据，研究了尺度空间中的能量传递。在壁面附近，湍流能量的展向部分出现了逆叶栅。为了了解与逆叶栅相关的流动结构，计算了与能量产生项负值相关的速度场条件平均值。有条件平均量的剖面图显示，在负生产区域附近有一个大的流向涡，而上游有一个小涡。分析表明，前一个主涡的旋转是在后一个上游涡的影响下，由SGS效应驱动的。
The energy transfer in the scale space was examined using the DNS data of turbulent channel flow. The inverse cascade of the spanwise part of turbulent energy was seen near the wall. In order to understand the flow structure associated with the inverse cascade, the conditional average of velocity field was evaluated in relation to the negative value of the energy production term. Profiles of the conditionally averaged quantities showed a large streamwise vortex near the region of the negative production and a small vortex located upstream. It is suggested that the rotation of the former main vortex is driven by the SGS effect under the influence of the latter upstream vortex.