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Large Eddy Simulation of Coherent Structure of Impinging Jet

Journal of Thermal Science 2005年第2期14卷 150-155页

作者： mingzhouyu LihuaCHEN HanhuiJIN JianrenFAN CollegeofMechanicalandEnergyEngineering ZhejiangUniversityHangzhouChina310027

The flow field of a rectangular exit, semi-confined and submerged turbulent jet impinging orthogonally on a flat plate with Reynolds number 8500 was studied by large eddy simulation (LES). A dynamic sub-grid stress model has been used for the small scales of turbulence. The evolvements such as the forming, developing, moving,pairing and merging of the coherent structures of vortex in the whole regions were obtained. The results revealed that the primary vortex structures were generated periodically, which was the key factor to make the secondary vortices generate in the wall jet region. In addition, the eddy intensity of the primary vortices and the secondary vortices induced by the primary vortices along with the time were also analyzed.

关键词： large eddy simulation impinging jet coherent structure.

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Distribution of non-spherical nanoparticles in turbulent flow of ventilation chamber considering fluctuating particle number density

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Applied Mathematics and Mechanics(English Edition) 2021年第3期42卷 317-330页

作者： Ruifang SHI Jianzhong LIN Hailin YANG mingzhouyu Department of Mechanics State Key Laboratory of Fluid Power and Mechatronic SystemsZhejiang UniversityHangzhou 310027China College of Mechanical and Electrical Engineering China Jiliang UniversityHangzhou 310028China

The Reynolds-averaged general dynamic equation(RAGDE)for the nanoparticle size distribution function is derived,including the contribution to particle coagulation resulting from the fluctuating *** equation together with that of a turbulent gas flow is solved numerically in the turbulent flow of a ventilation chamber with a jet on the wall based on the proposed model relating the fluctuating coagulation to the gradient of mean *** results are compared with the experimental *** results show that the proposed model relating the fluctuating coagulation to the gradient of mean concentration is reasonable,and it is necessary to consider the contribution to coagulation resulting from the fluctuating concentration in such a *** changes of the particle number concentration M_(0) and the geometric mean diameter dg are more obvious in the core area of the jet,but less obvious in other *** the increase in the initial particle number concentration m00,the values of M_(0) and the standard deviation of the particle sizeσdecrease,but the value of d_(g) *** decrease in the initial particle diameter leads to the reduction of M_(0) andσand the increase in d_(g).With the increase in the Reynolds number,particles have few chances of collision,and hence the coagulation rate is reduced,leading to the increase in M_(0) andσand the decrease in d_(g).

关键词： non-spherical nanoparticle fluctuating particle concentration ventilation chamber particle distribution

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