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| 1 | Effect of Mach number on transonic flow past a circular cylinder显示文摘The effect of Mach number on transonic flow past a circular cylinder is investigated numerically for the free-stream Mach number M∞ from 0.85 to 0.98 and the Reynolds number 2×105 based on the diameter of the cylinder. The work provides an insight into several salient features, including unsteady and quasi-steady flow state, formation of local supersonic zone, and evolution of turbulent shear layer. Results show that there exist two flow states dependent of a critical Mach number Mcr around 0.9. One is an unsteady flow state characterized by moving shock waves interacting with the turbulent flow in the near region of the cylinder for M∞Mcr, suppressing vortex shedding from the cylin-der. Some flow behaviors in the unsteady and quasi-steady flow states are revealed. From time evolu-tion of flow structures, local supersonic zones are identified in the wake and generated by two typical processes, i.e. reverse flow behind the cylinder and shed vortices in the near wake. The convective Mach number Mc of turbulent shear layers shed from the cylinder is identified nearly as Mc<1 in the unsteady flow regime and Mc>1 in the quasi-steady flow regime, resulting in different evolutions of the shear layers. | XU ChangYue CHEN LiWei LU XiYun | 2009 | Chinese Science Bulletin2009，54，11： | 15 |
| 2 | Impaired tumor angiogenesis and VEGF- induced pathway in endothelial CD146 knockout mice显示文摘 | Qiqun Zeng Zhenzhen Wu Hongxia Duan Xuan Jiang Tao Tu Di Lu Yongting Luo Ping Wang Lina Song Jing Feng Dongling Yang Xiyun Yan | 2014 | Protein & Cell2014，5，6： | 6 |
| 3 | Measurements and analysis of force and moment of caudal fin model in C-start显示文摘与不同形状和不同秋千持续时间对鱼的尾的鳍模型起作用的不稳定的水动力学力量和时刻试验性地被测量模仿鱼 C 开始。模型的运动被旋转描绘模型到在旅行时间 Tu 并且回到在在它的根轴附近的回来时间 Td 的起始的位置的一个最大的偏转角度。研究证明尾鳍的戏在鱼 C 开始的一个重要角色并且与不同形状和不同秋千持续时间尾鳍产生不同力量和时刻。另外,与不同形状对模型起作用的水动力学力量和时刻能被 2 nd 和 3 区域的 rd 时刻分别地。与不同秋千持续时间对模型起作用的力量和时刻,而是到 Td 的 Tu 的一样的比率能也被放大。 | ZHAO Liang JING Jun LU Xiyun YIN Xiezhen | 2006 | Progress in Natural Science:Materials International2006，16，8： | 5 |
| 4 | Numerical investigation on the aerodynamics of a simplified high-speed train under crosswinds显示文摘The yaw effect of the side flow around a high-speed train is studied by means of large eddy simulation at two typical yaw angles of φ = 30° and 60°, respectively. Both the mean and fluctuating values of lift force and side force coefficients increase obviously as the yaw angle increases. The spectral analysis indicates that the time-dependent aerodynamic forces are dominated by several energetic frequencies and the frequency range is broadened to a higher extent for the large yaw angle. To have a better understanding of the train aerodynamic behaviors, the dedicate three-dimensional vortical structures are analyzed for the flow at the two yaw angles. Moreover, the time-averaged flow patterns, turbulent statistics and the surface forces are also studied on sectional planes along the train. | Yueqing Zhuang Xiyun Lu | 2015 | Theoretical & Applied Mechanics Letters2015，5，5： | 4 |
| 5 | Effects of the injector geometry on a sonic jet into a supersonic crossflow显示文摘Large-eddy simulation of a sonic injection from circular and elliptic injectors into a supersonic crossflow has been performed.The effects of injector geometry on various fundamental mechanisms dictating the intricate flow phenomena including shock/jet interaction,jet shear layer vortices and their evolution,jet penetration properties and the relevant turbulence behaviors have been studied systematically.As a jet issuing transversely into a supersonic crossflow,salient three-dimensional shock and vortical structures,such as bow,separation and barrel shocks,Mach disk,horseshoe vortex,jet shear layer vortices and vortex pairs,are induced.The shock structures exhibit considerable deformations in the circular injection,while their fluctuation becomes smaller in the elliptic injection.The jet shear layer vortices are generated at the jet periphery and their evolution characteristics are analyzed through tracing the centroid of these coherent structures.It is found that the jet from the elliptic injector spreads rapidly in the spanwise direction but suffers a reduction in the transverse penetration compared to the circular injection case.The turbulent fluctuations are amplified because of the jet/crossflow interaction.The vertical Reynolds normal stress is enhanced in the downstream of the jet because of the upwash velocity induced by the counter-rotating vortex pair. | WANG GuoLei CHEN LiWei LU XiYun | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，2： | 3 |
| 6 | An improved dynamic subgrid-scale model and its application to large eddy simulation of rotating channel flows显示文摘A new dynamic subgrid-scale (SGS) model, which is proved to satisfy the principle of asymptotic material frame indifference (AMFI) for rotating turbulence, is proposed based on physical and mathematical analysis. Comparison with direct numerical simulation (DNS) results verifies that the new SGS model is effective for large eddy simulation (LES) on rotating turbulent flow. The SGS model is then applied to the LES of the spanwise rotating turbulent channel flow to investigate the rotation effect on turbulence characteristics, budget terms in the transport equations of resolved Reynolds stresses, and flow structures near the wall regions of the rotating channel. | LIU Nansheng LU Xiyun ZHUANG Lixian | 2004 | Science China(Physics,Mechanics & Astronomy)2004，47，4： | 2 |
| 7 | Constraine d large-e ddy simulation of turbulent flow over inhomogeneous rough surfaces显示文摘In this work we extend the method of the constrained large-eddy simulation(CLES)to simulate the tur-bulent flow over inhomogeneous rough walls.In the original concept of CLES,the subgrid-scale(SGS)stress is constrained so that the mean part and the fluctuation part of the SGS stress can be modelled separately to improve the accuracy of the simulation result.Here in the simulation of the rough-wall flows,we propose to interpret the extra stress terms in the CLES formulation as the roughness-induced stress so that the roughness inhomogeneity can be incorporated by modifying the formulation of the constrained SGS stress.This is examined with the simulations of the channel flow with the spanwise alternating high/low roughness strips.Then the CLES method is employed to investigate the temporal response of the turbulence to the change of the wall condition from rough to smooth.We demonstrate that the temporal development of the internal boundary layer is just similar to that in a spatial rough-to-smooth transition process,and the spanwise roughness inhomogeneity has little impact on the transition process. | Wen Zhang Minping Wan Zhenhua Xia Jianchun Wang Xiyun Lu Shiyi Chen | 2021 | Theoretical & Applied Mechanics Letters2021，11，1： | 2 |
| 8 | Onset of instability of a flag in uniform flow显示文摘This paper numerically and analytically studies the onset of instability of a flag in uniform flow.The three-dimensional(3D) simulation is performed by using an immersed-boundary method coupled with a nonlinear finite element method.The global stability,bistability and instability are identified in the 3D simulations.The Squire's theorem is extended to analyze the stability of the fluid-flag system with 3D initial perturbations.It is found that if a parallel flow around the flag admits an unstable 3D disturbance for a certain value of the flutter speed,then a two-dimensional(2D) disturbance at a lower flutter speed is also admitted.In addition,the growth rate of 2D disturbance is larger than that of the 3D disturbance. | Fangbao Tian Xiyun Lu Haoxiang Luo | 2012 | Theoretical & Applied Mechanics Letters2012，2，2： | 2 |
| 9 | Numerical investi- gation of a jet from a blunt body opposing a supersonic flow 显示文摘 | CHEN Liwei WANG Guolei LU Xiyun | 2011 | Joumal of Fluid Mechanics2011，684，： | 1 |
| 10 | NUMERICAL INVESTIGATION ON OSCILLATING FLOWSPAST A HALF CIRCULAR CYLINDER ON A PLANE显示文摘Oscillating flow over a half circular cylinder on a plane is studied numerically by solving the two-dimensional incompressible Navier-Stokes equations using thenon-staggered-grid, fractional step method for KC =0. 5-6. 0 and Re=500, 2000, 104.The objective of this study is to investigate the flow structure and force feature. At smallKC number, only the Stokes layer occurs and the thickness of the Stokes layer becomesthinner with increasing Re. At higher KC value, vortex shedding appears and the vorticesshed from the cylinder interact further with the boundary layer formed on the plane. Additionany, the influence of KC and Re on the force behavior is also discussed- | Lu, Xiyun Zhuang, Lixian | 1999 | Journal of Hydrodynamics1999，11，2： | 1 |
| 11 | Calculation of the timing of vortex formation from an oscillating cylinder显示文摘 | LU Xiyun and DALTON C | 1996 | J Fluid Structures1996，10，： | 1 |
| 12 | Characteristics of flow over traveling wavy foils in a side-by-side arrangement显示文摘 | DONG Genjin LU Xiyun | 2007 | Physics of fluids2007，，05： | 1 |
| 13 | CD146 is a coreceptor for VEGFR-2 in tumor angiogenesis显示文摘 | Tianxia Jiang Jie Zhuang Hongxia Duan Yongting Luo Qiqun Zeng Kelong Fan Huiwen Yan Di Lu Zhongde Ye Junfeng Hao Jing Feng Dongling Yang Xiyun Yan | 2012 | Blood2012，，11： | 1 |
| 14 | A dynamic subgrid-scale model for the large eddy simulation of stratified flow显示文摘 | Ningyu Liu Xiyun Lu Lixian Zhuang | 2000 | Science in China Series A: Mathematics2000，，4： | 1 |
| 15 | Large eddy simulation of a thermally stratified turbulent channel flow with temperature oscillation on the wall显示文摘 | DONG Yuhong LU Xiyun | 2004 | International Journal of Heat and Mass Transjer2004，47，1011： | 1 |
| 16 | Large-eddy simulations of turbulent swirling flows injected into a dump chamber显示文摘 | LU Xiyun WANG Shanwu Sung H G | 2005 | Journal of Fluid Mechanics2005，527，1： | 1 |
| 17 | Large eddy simulation of a vortex ring impinging on a three-dimensional circular cylinder显示文摘A vortex ring impacting a three-dimensional circular cylinder is studied using large eddy simulation(LES) for a Reynolds number Re = 4 × 10 4 based on the initial translation speed and diameter of the vortex ring.We have investigated the evolution of vortical structures and identified three typical evolution phases.When the primary vortex closely approaches to the cylinder,a secondary vortex is generated and its segment parts move inward to the primary vortex ring.Then two large-scale loop-like vortices are formed to evolve in opposite directions.Thirdly,the two loop-like vortices collide with each other to form complicated small-scale vortical structures.Moreover,a series of hair-pin vortices are generated due to the stretching and deformation of the tertiary vortex.The trajectories of vortical structures and the relevant evolution speeds are analyzed.The total kinetic energy and enstrophy are investigated to reveal their properties relevant to the three evolution phases. | Heng Ren Xiyun Lu | 2013 | Theoretical & Applied Mechanics Letters2013，3，3： | 1 |
| 18 | A dynamic subgrid-scale model for the large eddy simulation of stratified flow显示文摘 | Ningyu Liu Xiyun Lu Lixian Zhuang | 2000 | Science in China Series A: Mathematics2000，，4： | 1 |
| 19 | Effects of injection temperature on the jet evolution under supercritical conditions显示文摘A nitrogen jet with subcritical and supercritical injection temperatures injected into a supercritical environment, in which both the pressure and temperature exceed those of the thermodynamic critical state, has been investigated numerically using large-eddy simulation technique. The effects of the injection temperature on the flow evolution are studied. We find that the jet surface is more unstable with the instability waves growing up and rolling into a succession of ring vortices for supercritical injection temperature, and the jet surface is nearly straight with the strong density stratification suppressing the development of the instability waves for subcritical injection temperature. With increasing injection temperature, the spatial growth rate of the surface instability wave strengthens and the frequency of the most unstable mode increases. This behavior is of importance in enhancing the fluid mixing effect. The results obtained in this study provide physical insight into the understanding of fundamental mechanisms of the jet evolution under supercritical conditions. | YIN YanMei LU XiYun | 2009 | Chinese Science Bulletin2009，54，22： | 1 |
| 20 | Black phosphorus quantum dots as multifunctional nanozymes for tumor photothermal/catalytic synergistic therapy显示文摘Nanozymes are nanomaterials with enzyme-like properties that have attracted significant interest owing to their high stability,easy preparation,and tunable catalytic properties,especially in the field of cancer therapy.However,the unfavorable catalytic effects of nanozymes in the acidic tumor microenvironment have limited their applications.Herein,we developed a biomimetic erythrocyte membrane-camouflaged ultrasmall black phosphorus quantum dots(BPQDs)nanozymes that simultaneously exhibited an exceptional near-infrared(NIR)photothermal property and dramatically photothermal-enhanced glucose oxidase(GOx)-like activity in the acidic tumor microenvironment.We demonstrated the engineered BPQDs gave a photothermal conversion efficiency of 28.9%that could rapidly heat the tumor up to 50℃ while effectively localized into tumors via homing peptide iRGD leading after intravenously injection.Meanwhile,the significantly enhanced GOx-like activity of BPQDs under NIR irradiation was capable of catalytical generating massive toxic reactive oxygen species via using cellular glucose.By combining the intrinsic photothermal property and the unique photothermal-enhanced GOx-like catalytic activity,the developed BPQDs were demonstrated to be an effective therapeutic strategy for inhibiting tumor growth in vivo.We believe that this work will provide a novel perspective for the development of nanozymes in tumor catalytic therapy. | Hui Ding Daji Wang Haibing Huang Xiaozhu Chen Jie Wang Jinjie Sun Jianlin Zhang Lu Lu Beiping Miao Yanjuan Cai Kelong Fan Yongtian Lu Hongsong Dong Xiyun Yan Guohui Nie Minmin Liang | 2022 | Nano Research2022，15，2： | 1 |
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