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.

实施大涡模拟以研究低频湍流围绕内联块阵列的行为。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。由于速度波动的功率谱峰值在所有情况下都出现在低频处，因此在块体周围产生低频湍流。块体外侧流向速度脉动功率谱峰值频率与块体间展向速度脉动功率谱峰值频率吻合较好。这表明块体两侧的低频湍流强烈影响块体之间空间内的湍流。此外，