Turbulent flow around an inline array of blocks
Turbulent flow around an inline array of blocks
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DOI：
10.1007/s10652-022-09876-z
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发表时间：
2022-06
影响因子：
2.2
通讯作者：
T. Michioka
中科院分区：
文献类型：
--
作者：
T. Michioka
本文采用大涡模拟方法研究了一排圆柱体绕流的低频湍流特性。使用了三种不同类型的块，例如立方体块、垂直矩形块和水平矩形块。由于在所有情况下，速度波动的功率谱的峰值都出现在低频处，因此在块体周围产生低频湍流。块体侧面流向速度脉动功率谱的峰值频率与块体间展向速度脉动功率谱的峰值频率吻合较好。结果表明，块体两侧的低频湍流对块体间空间的湍流有很大的影响。此外，当块体两侧的底面附近出现一对高动量和低动量流体的大尺度结构时，在块体的前表面附近观察到从高动量流体到低动量流体的展向流动。
Large-eddy simulation is implemented to investigate the behavior of a low-frequency turbulent flow around an inline array of blocks. Three different types of blocks such as a cubic block, vertical rectangle block and horizontal rectangle block were used. Since the peak of the power spectra of the velocity fluctuation is appeared for a low frequency in all the cases, a low-frequency turbulent flow is generated around the blocks. The peak frequency of the power spectra of the streamwise velocity fluctuation at the lateral side of the blocks are in good agreement with the peak frequency of the power spectra of the spanwise velocity fluctuation between the blocks. It indicates that the low-frequency turbulent flow at both the lateral sides of the blocks strongly affects the turbulent flow within the spaces between the blocks. In addition, the spanwise flow from the high-momentum fluid to the low-momentum fluid is observed near the front face of the block when a pair of the large-scale structure of the high-momentum and low-momentum fluid is appeared near the bottom surface at the both sides of the blocks.