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| 1 | Incorporating boundary constraints to predict mean velocities in turbulent channel flow显示文摘We derive exact near-wall and centerline constraints and apply them to improve a recently proposed LPR model for finite Reynolds number(Re) turbulent channel flows.The analysis defines two constants which are invariant with Re and suggests two more layers for incorporating boundary effects in the prediction of the mean velocity profile in the turbulent channel.These results provide corrections for the LPR mixing length model and incorrect predictions near the wall and the centerline.Moreover,we show that the analysis,together with a set of well-defined sensitive indicators,is useful for assessment of numerical simulation data. | WU You CHEN Xi SHE ZhenSu HUSSAIN Fazle | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，9： | 4 |
| 2 | Hierarchical structures in climate and atmospheric turbulence显示文摘The climatic time series encompass many time scales, forming multi-scale climatic variations and hierarchies. The periods and magnitudes of cooling or warming, especially for extreme climatic events, vary with the time scales. On the other hand, high-frequency atmospheric turbulent motions, which are certainly related to the climatic changes, are also typical multi-scale phenomena. In this paper, certain properties of the fluctuations are examined that are invariant with the change of the time scales. Specifically, the existence of a statistical similarity law is demonstrated in climatic time series and in atmospheric turbulent motions. This is the hierarchical similarity law. Further analyses show that the hierarchical similarity law is a general property of multi-scale fluctuation systems. Therefore, the study on the hierarchical similarity law is important for understanding the inherent universal physical mechanism of complex systems in the atmospheric motions. | SHE Zhensu, FU Zuntao, CHEN Jiong, LIANG Shuang and LIU Shida(1. State Key Laboratory for Studies of Turbulence and Complex Systems, Department of Mechanics and Engineering Sciences, Peking University, Beijing 100871, China 2. School of Physics, Peking University, Beijing 100871, China 3. LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China) | 2002 | Progress in Natural Science:Materials International2002，12，10： | 3 |
| 3 | The nature of near-wall convection velocity in turbulent channel flow显示文摘狂暴的结构的一个新奇观点—本地串联结构—被介绍在狂暴的隧道流动学习传送对流现象。跨关联的方法被用来计算传送对流速度的一空间时间。墙附近有二典型传送对流速度,这被发现,与溪流与更低的速度和另外一个的小规模的条纹联系的更高的速度的明智的旋涡和发卡旋涡。狂暴的结构的新概念是强大的在近墙的传送对流说明协调结构的主导的角色,并且也揭示传送对流的性质—速度变化的模式的繁殖—它是规模依赖者。 | Yuhui Cao Jun Chen Zhensu She | 2008 | Acta Mechanica Sinica2008，24，5： | 2 |
| 4 | Seasonal fluxes and source variation of organic carbon transported by two major Chinese Rivers: The Yellow River and Changjiang (Yangtze) River显示文摘 | Wang Xuchen Ma Haiqing Li Ronghua Song Zhensu Wu Jinping | 2012 | EN2012，，2： | 2 |
| 5 | Experimental evidence for non-linear growth in compressible mixing layer显示文摘An experimental study of compressible mixing layers(CMLs)was conducted using planar laser Mie scattering(PLMS)visualizations from condensed ethanol droplets in the flow.Large ensembles of digital images were collected for two flow conditions at convective Mach numbers Mc=0.11 and 0.47.The coherent vortices,braids and eruptions in the mixing zone were observed,interpreted as evidence of multi-scale,three-dimensional structures at a high Reynolds number.The mixing layers with a large visualized range present two stages along the streamwise direction,corresponding to the initial mixing and the well-developed stage.A new method,the gray level ensemble average method(GLEAM),by virtue of the similarity of the mixing layer,was applied to measure the growth rate of the CML thickness.New evidence for a nonlinear growth of CML is reported,providing an interpretation of previous observations of the scattering of the growth rate. | WANG TieJin CHEN Jun SHI XiaoTian HU Ning SHE ZhenSu | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，5： | 1 |
| 6 | New scaling for compressible wall turbulence显示文摘Classical Mach-number(M) scaling in compressible wall turbulence was suggested by van Driest(Van Driest E R.Turbulent boundary layers in compressible fluids.J Aerodynamics Science,1951,18(3):145-160) and Huang et al.(Huang P G,Coleman G N,Bradshaw P.Compressible turbulent channel flows:DNS results and modeling.J Fluid Mech,1995,305:185-218).Using a concept of velocity-vorticity correlation structure(VVCS),defined by high correlation regions in a field of two-point cross-correlation coefficient between a velocity and a vorticity component,we have discovered a limiting VVCS as the closest streamwise vortex structure to the wall,which provides a concrete Morkovin scaling summarizing all compressibility effects.Specifically,when the height and mean velocity of the limiting VVCS are used as the units for the length scale and the velocity,all geometrical measures in the spanwise and normal directions,as well as the mean velocity and fluctuation(r.m.s) profiles become M-independent.The results are validated by direct numerical simulations(DNS) of compressible channel flows with M up to 3.Furthermore,a quantitative model is found for the M-scaling in terms of the wall density,which is also validated by the DNS data.These findings yield a geometrical interpretation of the semi-local transformation(Huang et al.,1995),and a conclusion that the location and the thermodynamic properties associated with the limiting VVCS determine the M-effects on supersonic wall-bounded flows. | PEI Jie CHEN Jun FAZLE Hussain SHE ZhenSu | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，9： | 1 |
| 7 | Absolute stability of neutral type Lurie indirect control systems 显示文摘 | NIAN Xiaohong LU Zhensu | 1999 | Journal of Lanzhou University (Natural Science)1999，35，2： | 1 |
| 8 | Absolute stability of neutral type Lurie indirect control systems显示文摘 | Nian Xiao-hong Lu Zhensu | 1999 | Journal of Lanzhou University (Natural Science)1999，35，2： | 1 |
| 9 | Quantized energy cascade and log-Poisson statistics in fully developed turbulence显示文摘 | SHE Zhensu WAYMIRE E C | 1995 | Physical Review Letters1995，74，2： | 1 |
| 10 | Absolute stability of neutral type Lurie indirect control systems显示文摘 | Nian Xiaohong Lu Zhensu | 1999 | Journal of Lanzhou University (Natural Science)1999，35，2： | 1 |
| 11 | Structure and corrosion behavior of 316L stainless steel coatings formed by HVAF spraying with and without sealing显示文摘 | Zhensu Zeng Nobuaki Sakoda Toshiro Tajiri Seiji Kuroda | 2008 | Surface & Coatings Technology2008，，3： | 1 |
| 12 | Multi-scaling hierarchical structure analysis on the sequence of E.coli complete genome显示文摘We have applied the newly developed hierarchical structure theory for complex systems to analyze the multi-scaling structures of the nucleotide density distribution along a linear DNA sequence from the complete Escherichia coli genome. The hierarchical symmetry in the nucleotide density distribution was demonstrated. In particular, we have shown that the G, C density distribution that represents a strong H-bonding between the two DNA chains is more coherent with smaller similarity parameter compared to that of A, T density distribution, indicating a better organized multi-scaling fluctuation field for G, C density distributionalong the genome sequence. The biological significance of these findings is under investigation. | WANG Jin ZHANG Qidong REN Kui SHE Zhensu | 2001 | Chinese Science Bulletin2001，46，23： | 1 |
| 13 | Intensity-based robust similarity for multimodal image registration显示文摘 | Du Juan Tang Songyuan Jiang Tianzi Lu Zhensu | 2006 | International Journal of Computer Mathematics2006，83，1： | 1 |
| 14 | Absolute stability of neutral type Lurie indir ect control systems显示文摘 | Nian Xiaohong Lu Zhensu | 1999 | Journal of Lanzhou University (Natural Science)1999，35，2： | 1 |
| 15 | Intensity-based robust similarity for multimodal image registration显示文摘 | Du Juan Tang Songyuan Jiang Tianzi Lu Zhensu | 2006 | International Journal of Computer Mathamatics2006，83，： | 1 |
| 16 | Effects of Some Light Alloying Elements on the Oxidation Behavior of Fe and Ni-Cr Based Alloys During Air Plasma Spraying显示文摘 | Zeng Zhensu Seiji Kuroda Jin Kawakita | | 0，，1： | 1 |
| 17 | β-distribution for Reynolds stress and turbulent heat flux in relaxation turbulent boundary layer of compression ramp显示文摘A challenge in the study of turbulent boundary layers(TBLs) is to understand the non-equilibrium relaxation process after separation and reattachment due to shock-wave/boundary-layer interaction. The classical boundary layer theory cannot deal with the strong adverse pressure gradient, and hence, the computational modeling of this process remains inaccurate. Here, we report the direct numerical simulation results of the relaxation TBL behind a compression ramp, which reveal the presence of intense large-scale eddies, with significantly enhanced Reynolds stress and turbulent heat flux. A crucial finding is that the wall-normal profiles of the excess Reynolds stress and turbulent heat flux obey a β-distribution, which is a product of two power laws with respect to the wall-normal distances from the wall and from the boundary layer edge. In addition, the streamwise decays of the excess Reynolds stress and turbulent heat flux also exhibit power laws with respect to the streamwise distance from the corner of the compression ramp. These results suggest that the relaxation TBL obeys the dilation symmetry, which is a specific form of self-organization in this complex non-equilibrium flow. The β-distribution yields important hints for the development of a turbulence model. | YanChao Hu WeiTao Bi ShiYao Li ZhenSu She | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，12： | 0 |
| 18 | Accurately predicting hypersonic transitional flow on cone via a symmetry approach显示文摘A new algebraic transition model is proposed based on a Structural Ensemble Dynamics(SED)theory of wall turbulence,for accurately predicting the hypersonic flow heat transfer on cone.The model defines the eddy viscosity in terms of a two-dimensional multi-regime distribution of a Stress Length(SL)function,and hence is named as SED-SL.This paper presents clear evidence of precise predictions of transition onset location and peak heat flux of a wide range of hypersonic Transitional Boundary Layers(TrBL)around straight cone at zero incidence,to an unprecedented accuracy as validated by over 70 measurements for varying five crucial influential factors(Mach number,temperature ratio,cone half angle,nose Reynolds number and noise level).The results demonstrate the universality of the postulated multi-regime similarity structure,in characterizing not only the spatial non-uniform distribution of the eddy viscosity in hypersonic TrBL on cone,but also the dependence of the transition onset location on the five influential factors.The latter yields a novel correlation formula for transition center Reynolds number which takes similar functional form as the SL function within the symmetry approach.It is concluded that the SED-SL model simulates TrBL around cone with uniformly high accuracy,and then points out to an optimistic alternative way to construct hypersonic transition model. | Weitao BI Kexin ZHENG Zhou WEI Zhensu SHE | 2023 | Chinese Journal of Aeronautics2023，36，7： | 0 |
| 19 | Multi-layer analytic solution for k-ωmodel equations via a symmetry approach显示文摘Despite being one of the oldest and most widely-used turbulence models in engineering computational fluid dynamics(CFD),the k-ωmodel has not been fully understood theoretically because of its high nonlinearity and complex model parameter setting.Here,a multi-layer analytic expression is postulated for two lengths(stress and kinetic energy lengths),yielding an analytic solution for the k-ωmodel equations in pipe flow.Approximate local balance equations are analyzed to determine the key parameters in the solution,which are shown to be rather close to the empirically-measured values from the numerical solution of the Wilcox k-ωmodel,and hence the analytic construction is fully validated.The results provide clear evidence that the k-ωmodel sets in it a multilayer structure,which is similar to but different,in some insignificant details,from the Navier-Stokes(N-S)turbulence.This finding explains why the k-ωmodel is so popular,especially in computing the near-wall flow.Finally,the analysis is extended to a newlyrefined k-ωmodel called the structural ensemble dynamics(SED)k-ωmodel,showing that the SED k-ωmodel has improved the multi-layer structure in the outer flow but preserved the setting of the k-ωmodel in the inner region. | Fan TANG Weitao BI Zhensu SHE | 2023 | Applied Mathematics and Mechanics(English Edition)2023，44，2： | 0 |
| 20 | Sub-ensemble study of pressure gradient effects on the variation of Karman constant显示文摘Using data from direct numerical simulation (DNS) of incompressible and compressible channel flow, we develop a method of sub-ensemble decomposition to investigate the pressure gradient effect on the Karman constant and the additive constant B characterizing the mean velocity profile (MVP). The sub-ensemble decomposition is defined according to the magnitude of vertical fluctuation velocity, which mimics coherent motions like ejection and sweep. DNS data analysis shows that each sub-ensemble displays a distinct Karman constant, with a variation which mimics effects of pressure gradient. The latter is demonstrated by a relation between sub-ensembles' m and Bm similar to empirical data under various pressure gradients. A set of global parameters, 0-pg=0.39 & B0-pg=5.5, are then derived for interpreting two constants observed by Nagib et al. | WANG YanZhi SHE ZhenSu | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，8： | 0 |
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