Preliminary Research on Characteristics of Very-large-scale Turbulence Motions in Decelerating Open Channel Flow

ZHANG Peng; DUAN Yan-chong; WANG Yong-qiang; HU Jiang; YANG Sheng-fa; LI Wen-jie

doi:10.11988/ckyyb.20210617

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Journal of Changjiang River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (9) : 77-83. DOI: 10.11988/ckyyb.20210617

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Preliminary Research on Characteristics of Very-large-scale Turbulence Motions in Decelerating Open Channel Flow

ZHANG Peng¹, DUAN Yan-chong², WANG Yong-qiang³, HU Jiang⁴, YANG Sheng-fa¹, LI Wen-jie¹

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Abstract

This study experimentally examined the very-large-scale motions (VLSMs) characteristics in decelerating open-channel flow based on acoustic Doppler current profiler (ADCP) and acoustic Doppler velocimeter (ADV) measurements. Meanwhile, the turbulence intensity, VLSMs’ wavelength and turbulent kinetic energy ratio were analyzed. Statistical evidence of the presence of VLSMs in decelerating open channel flow was presented. Moreover, its streamwise scale increased first and then decreased along with the water depth. The VLSMs still exist in the water surface area of the decelerating open channel flow and occupy about 46% of the turbulent kinetic energy.

Key words

decelerating flow / very-large-scale motions / coherent structure / power spectra / turbulent kinetic energy

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ZHANG Peng, DUAN Yan-chong, WANG Yong-qiang, HU Jiang, YANG Sheng-fa, LI Wen-jie. Preliminary Research on Characteristics of Very-large-scale Turbulence Motions in Decelerating Open Channel Flow[J]. Journal of Changjiang River Scientific Research Institute. 2022, 39(9): 77-83 https://doi.org/10.11988/ckyyb.20210617

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