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Analysis of coherent structures in drag-reducing polymer solution flow based on proper orthogonal decomposition

Science China(Physics,Mechanics & Astronomy) 2012年第5期55卷 854-860页

作者： CAI WeiHua LI FengChen ZHANG HongNa WANG Yue WANG Lu School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

Direct numerical simulation(DNS) of forcing homogeneous isotropic turbulence with polymers was *** order to understand the polymers effect on turbulent coherent structures,proper orthogonal decomposition was performed to identify coherent structures based on DNS data,so as to analyze the remarkable difference due to the addition of *** results showed that the numbers for eigenmodes required for capturing coherent structures were 32 and 24 for the Newtonian fluid and polymer solution flows,respectively,which means the decrease of the complexity in polymer solution *** the POD energy spectrum,it was found that the turbulent kinetic energy is distributed onto a large number of eigenmodes whether in the Newtonian fluid flow or polymer solution flow,suggesting that polymer solution flow is still turbulent in one ***,the POD eigenmodes were investigated,which found that the small-scale structures are inhibited in polymer solution flow.

关键词： coherent structures polymer drag reduction isotropic turbulence proper orthogonal decomposition

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Passive scalar characteristics along inertial particle trajectory in turbulent non-isothermal flows

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Science China(Technological Sciences) 2012年第9期55卷 2593-2600页

作者： YI Chao LIU YaMing HE Zhu LIU ZhaoHui ZHENG ChuGuang State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

The momentum and heat coupling between carrier fluid and particles are a complex and challenge topic in turbulent reactive gas-solid flow *** observations on this topic,either numerical or experimental,are based on Eulerian framework,which is not enough for developing the probability density function(PDF) *** this paper,the instantous behavior and multi-particle statistics of passive scalar along inertial particle trajectory,in homogenous isotropic turbulence with a mean scalar gradient,are investigated by using the direct numerical simulation(DNS).The results show that St^1.0 particles are easy to aggregate in high strain and low vorticity regions in the fluid field,where the scalar dissipation is usually much higher than the mean value,and that every time they move across the cliff structures,the scalar change is much more ***,the self-correlation of scalar along particle trajectory is significantly different from the velocities observed by particle,for which the prefer-concentration effect is *** mechanical-to-thermal time scale ratio averaged along the particles, p,is approximately two times smaller than that computed in the Eulerian frame r,and stays at nearly 1.77 with a weak dependence on particle inertia.

关键词： DNS non-isothermal flow gas.particle flow passive scalar isotropic turbulence

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SKEWNESS FACTOR OF TURBULENT VELOCITY DERIVATIVE

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Acta Mechanica Sinica 1994年第1期10卷 12-15页

作者：钱俭 Department of Physics Graduate School of Academia Sinica Beijing 100039 China

Using nonequilibrium statistical mechanics closure method, it is shown that the skewness factor of the velocity derivative of isotropic turbulence ap- proaches a constant -0.515 when the Reynolds number is very high, ... 详细信息

关键词： skewness factor isotropic turbulence intermittency statistical theory of turbulence

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Large scale dynamics in two-dimensional turbulence

Large scale dynamics in two-dimensional turbulence

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第十二届现代数学和力学会议

作者：冉政 Shanghai Institute of Applied Mathematics and Mechanics Shanghai University

We consider freely decaying two-dimensional isotropic *** is usually assumed that, in such turbulence,the energy spectrum at small wave-number,k,takes the form E(k→0)∝Ik, where I is the two-dimensional version of Loitsyansky’s *** this paper,we developed a simple model for large scale dynamics of free decay two-dimensional turbulence based on the statistical solution of Navier-Stokes *** provide one possible explanation for the large scale dynamics in two-dimensional turbulence.

关键词： isotropic turbulence large scale dynamics

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