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Detached-eddy simulation of turbulent coherent structures around groynes in a trapezoidal open channel

Journal of Hydrodynamics 2020年第2期32卷 326-336页

作者： Jing-xin Zhang Jian Wang Xiang Fan Dongfang Liang Key Laboratory of Hydrodynamics(Ministry of Education) shanghai Jiao Tong UniversityShanghai200240China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China

The hydrodynamics in a straight open channel with a multiple-embayment groyne field was investigated using the detached-eddy simulation(DES).A series of short groynes were included on a 1:3 side slope of the *** work focuses on the turbulent coherent structures around groynes on an uneven *** around groyne fields are characterized by massive separation and highly unsteady *** can capture a wide spectrum of eddies at a lower computational cost than the large eddy simulation(LES)or direct numerical simulation(DNS).In the present work,a zonal DES model(ZDES)was used to simulate the flow around *** ZDES model is a modified version of the DES designed to overcome the model-stress depletion(MSD)of the RANS/LES hybrid *** vortex system consists of the horseshoe vortex(HV)formed at the base of the obstructions,the necklace vortex(NV)that wrapped the groyne tips near the free surface,and the shedding vortex(SV)underneath the free *** effects of the incident flow and local topography on the vortex evolution were investigated by analyzing the mean flow structures and the instantaneous turbulent flow *** important vortices cannot be captured because of the averaging process,while some flow structures cannot be observed in the instantaneous *** mean flow is only a reflection of the averaging process when complex vortices are present.

关键词： Open channel flow groyne free surface detached eddy simulation turbulent coherent structure

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SOME CHARACTERISTICS OF LOW-SPEED STREAKS UNDER SHEARED AIR-WATER INTERFACES

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Acta Mechanica Sinica 2001年第2期17卷 115-124页

作者：王双峰贾复 Institute of Mechanics Chinese Academy of SciencesBeijing 100080China

The characteristics of low-speed fluid streaks occurring under sheared air-water interfaces were examined by means of hydrogen bubble visualization technique. A critical shear condition under which the streaky structure first appears was determined to be u(tau) approximate to 0.19 cm/s. The mean spanwise streak spacing increases with distance from the water surface owing to merging and bursting processes, and a linear relationship describing variation of non-dimensional spacing +)over bar> versus y(+) was found essentially independent of shear stress on the interface. Values of +)over bar>, however, are remarkably smaller than their counterparts in the near-wall region of turbulent boundary layers. Though low-speed streaks occur randomly in time and space, the streak spacing exhibits a lognormal probability distribution behavior. A tentative explanation concerning the formation of streaky structure is suggested, and the fact that +)over bar> takes rather smaller values than that in wall turbulence is briefly discussed.

关键词： air-water interface low-speed streak turbulent coherent structure flow visualization

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TheDirectNumericalSimulatonofAturbulentChannelFlowwithAnalysesoftheDatabase

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Communications in Nonlinear Science and Numerical Simulation 1996年第2期 48-53页

作者： Chunxiao XU & Zhaoshun ZHANG (Dept. of Eng. Mech., Tsinghua Univ., Beijing 100084)

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ＴｈｅＤｉｒｅｃｔＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｏｎｏｆＡＴｕｒｂｕｌｅｎｔＣｈａｎｎｅｌＦｌｏｗｗｉｔｈＡｎａｌｙｓｅｓｏｆｔｈｅＤａｔａｂａｓｅＣｈｕｎｘｉａｏＸＵ＆ＺｈａｏｓｈｕｎＺＨＡＮＧ（Ｄｅｐｔ．ｏｆＥｎｇ．Ｍｅｃｈ．，Ｔｓｉｎｇｈｕａ...

关键词： numerical simulation turbulent coherent structure turbulence models

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