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rans modeling of Solitary Wave Propagation over A Submerged Rectangular Breakwater

China Ocean Engineering 2009年第3期23卷 473-488页

作者： Tai-Wen HSU Chin-Yen TSAI Department of Hydraulic and Ocean Engineering National Cheng Kung University

In this paper a series of numerical simulations are performed to investigate the vortex shedding mechanism for a solitary wave propagating over a submerged breakwater by use of Reynolds averaged Navier-Stokes （RAINS） model combined with a k-ε model. Flows of different Reynolds numbers up to Re = 1.4 × 10^5 corresponding to varying incident wave heights are considered in which the characteristic fluid velocity is represented by the maximum horizontal velocity above the submerged breakwater. For the verification of the accuracy of the numerical model, the incident waves and the velocity field in the vicinity of the breakwater are compared with experimental data. The result shows that the model is capable of describing vortex shedding for a solitary wave propagating over a rectangular submerged breakwater. Key features of vortex generation, evolution and dissipation are investigated. It is found that the vortex shedding and their evolution due to separated boundary layer over the breakwater are strongly related to the Reynolds number. A considerable number of vortices and complicated vortex pattern are observed as the Reynolds number increases.

关键词： rans modeling solitary wave vortex shedding submerged breakwater

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Applying extended intrinsic mean spin tensor in evolution algorithm for rans modelling of turbulent rotating channel flow

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Journal of Hydrodynamics 2019年第6期31卷 1255-1258页

作者： Wei Zhang Bing Zhu Hui Xu Yong Wang Science and Technology on Water Jet Propulsion Laboratory Marine Design and Research Institute of ChinaShanghai 200011China School of energy and power engineering University of Shanghai for Science and TechnologyShanghai 210098China School of Aeronautic and Astronautic Shanghai Jiao Tong UniversityShanghai 200011China Max Planck Institute for Dynamics and Self-Organization Gottingen 37077Germany

We present a machine learning based method for rans modeling in the rotating frame of reference(RFR).The extended intrinsic mean spin tensor(EIMST)is adopted in a novel expansion of the evolution algorithm,named multi-dimensional gene expression programming(MGEP).Based on DNS data,a constrain free model for Reynolds stress is created by considering system *** anisotropy behavior of Reynolds stress is considered in the model,which is then for the first time applied for modeling turbulent flow inside a rotating *** with the traditional rans model,the new model can predict the non-symmetric profile of Reynolds ***,the Taylor-Gortler vortex is captured in our simulations with the new *** is demonstrated that the application of EIMST in MGEP can be successfully adopted for rans modeling in the RFR.

关键词： Extended intrinsic mean spin tensor rans modeling rotating frame of reference gene expression programming

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modeling Flows over Gravel Beds by a Body Force Method

Modeling Flows over Gravel Beds by a Body Force Method

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第六届国际流体力学会议

作者： C.Zeng C.W.Li Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong Kong China

A Reynolds-averaged Navier-stokes equations（rans） model using the body force method（BFM） has been developed to simulate open-channel flows over gravel *** momentum equation is modified by introducing the form drag as an extra body force term to represent the gravel-bed *** applying the body force within the roughness layer of the flow over small-scale roughness,it is found that the body force coefficient f rk varies inversely with the roughness length scale k *** method is robust,not sensitive to mesh resolution and is easily extended to deal with large scale roughness.

关键词： open-channel flows rans modeling turbulent flows gravel beds body force method

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