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A theoretical model for Reynolds-stress and dissipation-rate budgets in near-wall region

Science China Mathematics 2000年第2期43卷 199-204页

作者：陆利蓬陈矛章 Department of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing China

A 3-D wave model for the turbulent coherent structures in near-wall region is proposed. The transport nature of the Reynolds stresses and dissipation rate of the turbulence kinetic energy are shown via computation based on the theoretical model. The mean velocity profile is also computed by using the same theoretical model. The theoretical results are in good agreement with those found from DNS, indicating that the theoretical model proposed can correctly describe the physical mechanism of turbulence in near wall region and it thus possibly opens a new way for turbulence modeling in this region.

关键词： turbulence model Reynolds stress dissipation rate near-wall region 3-D waves.

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The Effect of the Gap Ratio on the Flow and Heat Transfer over a Bluff Body in near-wall Conditions

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Fluid Dynamics & Materials Processing 2022年第1期18卷 109-130页

作者： Shaohua Zhai Guannan Xi School of Mechanical Engineering Nantong UniversityNantong226019China School of Mechanical Engineering Nantong Institute of TechnologyNantong226019China

In order to study the effect of different gap ratios on the thermofluid-dynamic field around a bluff body located in proximity to a heated wall,a series of experiments and numerical simulations have been *** former were carried out using an open circulating water tank experimental platform and a single cylinder and square column as geometrical models(their characteristic length being D).The latter were based on the well-known SIMPLE algorithm for incompressible *** results show that the gap ratio is an important factor affecting the wake characteristics of near-wall bluff *** the gap ratio is small,the influence of the wall on the bluff body wake is *** an increase in the gap extension,periodic vortex shedding is enabled and heat transfer is strengthened accordingly;in addition,the vortex shedding period is larger for the square *** square column displays hysteresis compared with the cylinder at the same gap ratio(the critical gap ratio of cylinder is 0.2~0.4,while that of square column is 0.40.6).

关键词： Transition flow gap ratio near-wall flow characteristic enhanced heat transfer

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Relationship between wall shear stresses and streamwise vortices in turbulent flows over wavy boundaries

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Applied Mathematics and Mechanics(English Edition) 2019年第3期40卷 381-396页

作者： Lihao WANG Weixi HUANG Chunxiao XU Lian SHEN Zhaoshun ZHANG Applied Mechanics Laboratory Department of Engineering MechanicsTsinghua University Department of Mechanical Engineering and Saint Anthony Falls Laboratory University of Minnesota

The relationship between wall shear stresses and near-wall streamwise vortices is investigated via a direct numerical simulation(DNS) of turbulent flows over a wavy boundary with traveling-wave motion. The results indicate that the wall shear stresses are still closely related to the near-wall streamwise vortices in the presence of a wave. The wave age and wave phase significantly affect the distribution of a two-point correlation coefficient between the wall shear stresses and streamwise vorticity. For the slow wave case of c/Um = 0.14, the correlation is attenuated above the leeward side while the distribution of correlation function is more elongated and also exhibits a larger vertical extent above the crest. With respect to the fast wave case of c/U_m=1.4, the distribution of the correlation function is recovered in a manner similar to that in the flat-wall case. In this case, the maximum correlation coefficient exhibits only slight differences at different wave phases while the vertical distribution of the correlation function depends on the wave phase.

关键词： direct numerical simulation(DNS) wall shear stress near-wall streamwise vortex two-point correlation

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Application of numerical simulation to flow induced corrosion in flowing seawater system

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中国有色金属学会会刊：英文版 2004年第Z1期14卷 439-442页

作者： LIU Jing-jun LIN Yu-zhen YONG Xing-yue LI Xiao-yu School of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China School of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China School of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China School of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China

An established model was presented as a new kind of means for investigating flow induced corrosion. In this method the near-wall hydrodynamic parameters including wall shear stress τ and mass transfer coefficient k near the wall of materials can be numerically calculated, and combining corrosive kinetics tested by experiments, the corrosion rates can be also calculated accurately. The flow induced corrosion mechanism was further verified by numerical results in this model, and the various corrosion phenomena were explained. The modelled results also show that the ability to accurately utilize numerical method to study flow induced corrosion strongly to some extent depends on material corrosive kinetics processes tested by experiments.

关键词： flow induced corrosion numerical simulation near-wall hydrodynamic parameters mechanism

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