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| 1 | Where is the rudder of a fish?:the mechanism of swimming and control of self-propelled fish school显示文摘二维、三维的 biomimetic 的自己推动的游泳的数字模拟和控制捞学校在一粘滞流动被调查。与为二维、三维的动人的边界问题,它联合适应多格子的一个平行计算液体动力学包裹有限体积方法和液体的沉浸的边界和体积的方法,它在wakes 由于旋涡的相互作用被发现那没有合适的控制,有一条给定的 flapping 规则的鱼学校游泳不能保留一个队列的固定形状。以便理解鱼的秘密游泳,鱼运动的新反馈控制策略第一次被建议,即,运动速度被 flapping 频率调整尾,并且游泳的方向被摇摆一条鱼的头控制。结果证明与这反馈控制策略,一所鱼学校能把一个队列的好顺序放在航行,在圆附近转弯或游泳。这新控制策略,分开速度控制和方向控制,在 biomimetic 机器人鱼,它极大地与简化一条 biomimetic 机器人鱼的控制设备的构造是重要的。关键词自己推动的游泳 - 鱼游泳的反馈控制策略 - 方向控制 - 运动速度控制 - 三维的 biomimetic 鱼工程被中国(10172095 和 10672183 ) 的国家自然科学基础支持。 | Chuijie Wu Liang Wang | 2010 | Acta Mechanica Sinica2010，26，1： | 14 |
| 2 | Meta-analysis of Traditional Chinese Medicine in treating functional dyspepsia of liver-stomach disharmony syndrome显示文摘OBJECTIVE:To systematically assess the clinical effectiveness of traditional Chinese medicine(TCM) in the treatment of functional dyspepsia(FD) of liver-stomachdisharmonysyndromebymeta-analysis.METHODS:Random controlled trials(RCTs) were retrieved from databases,including Pubmed,China national knowledge infrastructure,Wanfang Data,VIP Information,and the Cochrane Library.Trials were selected according to inclusion criteria.The effects of traditional Chinese medicine(TCM) versus prokinetic agents in the treatment of functional dyspepsia(FD) of liver-stomach disharmony syndrome were compared by meta-analysis.RevMan 5.0.24 was used for data analysis.The effective rate was assessed by odds ratios(ORs),and 95% confidence intervals(CIs) were calculated.The cure rate was analyzed by the Peto OR.Simple statistical analysis was chosen to assess the frequency of prescribed Chinese herbs in treating this syndrome.RESULTS:Thirteen trials were included,involving 1153 patients,and these were of poor methodological quality.Twelve studies mentioned the effective rate and cure rate.TCM therapy showed a better clinical effect rate compared with that with prokinetic agents [OR:3.2,95% CI(2.27,4.51)].The TCM group also had a better cure rate than that in the group of prokinetic agents [Peto OR:2.26,95% CI(1.61,3.18)].With regard to the frequency of Chinese herbs used in these 13 trials,Baishao(Radix Paeoniae),Chaihu(Radix Bupleuri),and Gancao(Radix Glycyrrhizae) were mostly prescribed,followed by Xiangfu(Rhizoma Cyperi),Zhishi(Fructus Aurantii Immaturus),Zhiqiao(Fructus Aurantii),Foshou(Citrus medica var.sarcodactylis),and Chenpi(Pericarpium Citri Reticulatae).No serious adverse effects were reported.CONCLUSION:TCM therapy shows a superior effective rate and cure rate compared with those in prokinetic agents in the treatment of FD of liver-stomach disharmony syndrome.However,further strictly designed RCTs are required because of the poor quality of included trials. | Chuijie Wang Mingjin Zhu Wei Xia Wei Jiang Yan Li | 2012 | Journal of Traditional Chinese Medicine2012，32，4： | 9 |
| 3 | Shape optimization of the caudal fin of the three-dimensional self-propelled swimming fish显示文摘Shape optimization of the caudal fin of the three-dimensional self-propelled swimming fish,to increase the swimming efficiency and the swimming speed and control the motion direction more easily,is investigated by combining optimization algorithms,unsteady computational fluid dynamics and dynamic control in this study.The 3D computational fluid dynamics package contains the immersed boundary method,volume of fluid method,the adaptive multi-grid finite volume method and the control strategy of fish swimming.Through shape optimizations of various swimming speeds,the results show that the optimal caudal fins of different swimming modes are not exactly the same shape.However,the optimal fish of high swimming speed,whose caudal fin shape is similar to the crescent,also have higher efficiency and better maneuverability than the other optimal bionic fish at low and moderate swimming speeds.Finally,the mechanisms of vorticity creation of different optimal bionic fish are studied by using boundary vorticity-flux theory,and three-dimensional wake structures of self-propelled swimming of these fish are comparatively analyzed.The study of vortex dynamics reveals the nature of efficient swimming of the 3D bionic fish with the lunate caudal fin. | XIN ZhiQiang WU ChuiJie | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，2： | 7 |
| 4 | Numerical simulations and vorticity dynamics of self-propelled swimming of 3D bionic fish显示文摘Numerical simulations and the control of self-propelled swimming of three-dimensional bionic fish in a viscous flow and the mechanism of fish swimming are carried out in this study,with a 3D computational fluid dynamics package,which includes the immersed boundary method and the volume of fluid method,the adaptive multi-grid finite volume method,and the control strategy of fish swimming.Firstly,the mechanism of 3D fish swimming was studied and the vorticity dynamics root was traced to the moving body surface by using the boundary vorticity-flux theory.With the change of swimming speed,the contributions of the fish body and caudal fin to thrust are analyzed quantitatively.The relationship between vortex structures of fish swimming and the forces exerted on the fish body are also given in this paper.Finally,the 3D wake structure of self-propelled swimming of 3D bionic fish is presented.The in-depth analysis of the 3D vortex structure in the role of 3D biomimetic fish swimming is also performed. | XIN ZhiQiang WU ChuiJie | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，2： | 5 |
| 5 | Research on the optimal dynamical systems of three-dimensional Navier-Stokes equations based on weighted residual显示文摘In this paper, the theory of constructing optimal dynamical systems based on weighted residual presented by Wu & Sha is applied to three-dimensional Navier-Stokes equations, and the optimal dynamical system modeling equations are derived. Then the multiscale global optimization method based on coarse graining analysis is presented, by which a set of approximate global optimal bases is directly obtained from Navier-Stokes equations and the construction of optimal dynamical systems is realized. The optimal bases show good properties, such as showing the physical properties of complex flows and the turbulent vortex structures, being intrinsic to real physical problem and dynamical systems, and having scaling symmetry in mathematics, etc.. In conclusion, using fewer terms of optimal bases will approach the exact solutions of Navier-Stokes equations, and the dynamical systems based on them show the most optimal behavior. | NaiFu Peng Hui Guan ChuiJie Wu | 2016 | Science China(Physics,Mechanics & Astronomy)2016，59，4： | 4 |
| 6 | Analysis and Inverse Substructuring Computation on Dynamic Quality of Mechanical Assembly显示文摘Mechanical assembly has its own dynamic quality directly affecting the dynamic quality of whole product and should be considered in quality inspection and estimation of mechanical assembly. Based on functional relations between dynamic characteristics involved in mechanical assembly, the effects of assembling process on dynamic characteristics of substructural components of an assembly system are investigated by substructuring analysis. Assembly-coupling dynamic stiffness is clarified as the dominant factor of the effects and can be used as a quantitative measure of assembly dynamic quality. Two computational schemes using frequency response functions(FRFs) to determine the stiffness are provided and discussed by inverse substructuring analysis, including their applicable conditions and implementation procedure in application. Eigenvalue analysis on matrix-ratios of FRFs before and after assembling is employed and well validates the analytical outcomes and the schemes via both a lumped-parameter model and its analogic experimental counterpart. Applying the two schemes to inspect the dynamic quality provides the message of dynamic performance of the assembly system, and therefore improves conventional quality inspection and estimation of mechanical assembly in completeness. | Lü Guangqing YI Chuijie FANG Ke | 2016 | Chinese Journal of Mechanical Engineering2016，29，3： | 3 |
| 7 | Numerical simulations of sloshing and suppressing sloshing using the optimization technology method显示文摘Sloshing is a common phenomenon in nature and industry,and it is important in many fields,such as marine engineering and aerospace engineering.To reduce the sloshing load on the side walls,the topology optimization and optimal control methods are used to design the shape of the board,which is fixed in the middle of the tank.The results show that the new board shape,which is designed via topology optimization,can significantly reduce the sloshing load on the side wall. | Hui GUAN Yifei XUE Zhiiun WEI Chuijie WU | 2018 | Applied Mathematics and Mechanics(English Edition)2018，39，6： | 2 |
| 8 | Optimal dynamical systems of Navier-Stokes equations based on generalized helical-wave bases and the fundamental elements of turbulence显示文摘In this paper, we present the theory of constructing optimal generalized helical-wave coupling dynamical systems. Applying the helical-wave decomposition method to Navier-Stokes equations, we derive a pair of coupling dynamical systems based on optimal generalized helical-wave bases. Then with the method of multi-scale global optimization based on coarse graining analysis, a set of global optimal generalized helical-wave bases is obtained. Optimal generalized helical-wave bases retain the good properties of classical helical-wave bases. Moreover, they are optimal for the dynamical systems of Navier-Stokes equations, and suitable for complex physical and geometric boundary conditions. Then we find that the optimal generalized helical-wave vortexes fitted by a finite number of optimal generalized helical-wave bases can be used as the fundamental elements of turbulence, and have important significance for studying physical properties of complex flows and turbulent vortex structures in a deeper level. | NaiFu Peng Hui Guan ChuiJie Wu | 2016 | Science China(Physics,Mechanics & Astronomy)2016，59，11： | 2 |
| 9 | A study of a three-dimensional self-propelled flying bird with flapping wings显示文摘In this paper, a study of a three-dimensional(3D) self-propelled bionic flying bird in a viscous flow is carried out. This bionic bird is propelled and lifted through flapping and rotating wings, and better flying can be achieved by adjusting the flapping and rotation motion of wings. In this study, we found that the bird can fly faster forward and upward with appropriate center of rotation and oscillation without more energy consumption and have perfect flight performance at a certain angle of attack by adjusting the center of oscillation. The study utilizes a 3D computational fluid dynamics package which constitutes combined immersed boundary method and the volume of fluid method. In addition, it includes adaptive multigrid finite volume method and control strategy of swimming and flying. | ZHU LinLin GUAN Hui WU ChuiJie | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，9： | 2 |
| 10 | A study of a supersonic capsule/rigid disk-gap-band parachute system using large-eddy simulation显示文摘The aerodynamic performances and flow features of the capsule/rigid disk-gap-band(DGB)parachute system from the Mach number 1.8 to 2.2 are studied.We use the adaptive mesh refinement(AMR),the hybrid tuned center-difference and weighted essentially non-oscillatory(TCD-WENO)scheme,and the large-eddy simulation(LES)with the stretched-vortex subgrid model.The simulations reproduce complex interaction of the flow structures,including turbulent wakes and bow shocks,as well as bow shocks and expansion waves.The results show that the calculated aerodynamic drag coefficient agrees well with the previou simulation.Both the aerodynamic drag coefficient and the aerodynamic drag oscillation of the parachute system decrease with the increase of the initial Mach number of the fluid.It is found that the position and angle of the bow shock ahead of the canopy change as the Mach number increases,which makes the flow inside the canopy and the turbulent wake behind the canopy more complex and unstable. | Sheng GONG Chuijie WU | 2021 | Applied Mathematics and Mechanics(English Edition)2021，42，4： | 1 |
| 11 | Numerical analysis of the interaction of 3D compressible bubble clusters显示文摘Based on the bubble dynamic theory and the compressible two-phase flow solver of the open source software OpenFOAM, a numerical simulation study is carried out on the interactions of bubble clusters in a closed volume. The bubble dynamics and interactions of a single bubble, two bubbles, and four bubbles are investigated under the working conditions without and with the presence of a free surface. Through a parametric study, the qualitative patterns of the variations of the bubble collapse period, the volume compressibility, the bubble pressure peak value, and the breakdown, fusion, and separation phenomena with the parameters such as the bubble pressure, the radius size, the bubble spacing, and the distance from the free surface are obtained. The main factors affecting the bubble morphology and the dynamic characteristics are summarized from numerous parameter experiments. It is shown that, in the absence of a free surface, the main factors are the relative size of the bubbles, the pressure of the liquid, and the pressure differences among the bubbles, while in the presence of a free surface, the main factor is the pressure of the liquid between the upper surface of the bubble and the free surface. | Hui GUAN Jincheng WANG Zhijun WEI Chuijie WU | 2019 | Applied Mathematics and Mechanics(English Edition)2019，40，8： | 1 |
| 12 | Interactions of three-dimensional vicous axisymmetric vortex rings with a free surface显示文摘 | Wu Chuijie Fu Qiang Ma Huiyang | 1995 | Acta Mechanica Sinica1995，，3： | 1 |
| 13 | Dynamical separation of rigid bodies in supersonic flow显示文摘A computational investigation of the unsteady separation behavior of rigid bodies in Mach-4 flow is carried out. Two rigid bodies, a sphere and a cube, initially stationary, centroid axially aligned, are released and thereafter fly freely according to the aerodynamic forces experienced. During the separation process, the smaller cube can experience different types of movement and our principal interest here is the non-dimensional transverse velocity of it. The separation behavior is investigated for interactions between a sphere and a cube with different mass ratio and a constant initial distance between them. The qualitative separation behavior and the final transverse velocity of the small body are found to vary strongly with the mass ratio but less sensitive to the initial distance between the two bodies. At a critical mass ratio for a given distance, the smaller body transit from entrainment within the flow region bounded by the larger body's shock to expulsion and the accumulated transverse velocity of the small body is close to maximum. This phenomenon is the so-called ‘shock-wave surfing' phenomenon noted by Laurence & Deiterding for two spheres at hypersonic Mach numbers. Then we investigate the separation behavior of a sphere interaction with a rotary cube and with a non-rotary cube for a given mass ratio and different distance between them. The rotary is found to increase the likelihood of ‘surfing'. Only at a certain initial distance for a given mass ratio the rotary effect of cube can be neglectable. | LI Tao SUI JingXia GONG Sheng WU ChuiJie | 2015 | Science China(Technological Sciences)2015，58，12： | 0 |
| 14 | LARGE-EDDY SIMULATIONS OF TURBULENT CAVITY FLOWS WITH DYNAMIC SGS MODEL AND LBM ALGORITHM显示文摘A new method of dynamic SGS model with LBM is described in detail and a new average method of eliminating the inherent unphysical oscillation of LBM are given in this paper. Results using the method to simulate the two and three dimensional cavity flows are shown. | Guan Hui (College of Science, PLA of University of Science and Technology Nanjing 211101,P.R.China) Wu Chuijie (State Key Lab. of Turbulence Study, Peking University Beijing 100871,P.R.China) | 2001 | Transactions of Nanjing University of Aeronautics and Astronautics2001，18，z1： | 0 |
| 15 | A NEW FRONT TRACKING METHOD FOR COMPRESSIBLE FLOWS显示文摘In this paper, a new FCT VOF method is developed and applied to the study of the evolution of substance interfaces in compressible flows. | Wu Chuijie(Research Center for Fluid Dynamics, PLA University of Science and Technology Nanjing 211101,P.R.China) Zhao Hongliang (Key Lab. of Nonlinear Mechanics, Chinese Academy of Sciences Beijing 100080,P.R.China) | 2001 | Transactions of Nanjing University of Aeronautics and Astronautics2001，18，z1： | 0 |
| 16 | Topology Optimization of the Caudal Fin of the Three-Dimensional Self-Propelled Swimming Fish显示文摘Based on the boundary vorticity-flux theory,topology optimization of the caudal fin of the three-dimensional self-propelled swimming fish is investigated by combining unsteady computational fluid dynamics with moving boundary and topology optimization algorithms in this study.The objective functional of topology optimization is the function of swimming efficiency,swimming speed and motion direction control.The optimal caudal fin,whose topology is different from that of the natural fish caudal fin,make the 3D bionic fish achieve higher swimming efficiency,faster swimming speed and better maneuverability.The boundary vorticity-flux on the body surface of the 3D fish before and after optimization reveals the mechanism of high performance swimming of the topology optimization bionic fish.The comparative analysis between the swimming performance of the 3D topology optimization bionic fish and the 3D lunate tail bionic fish is also carried out,and the wake structures of two types of bionic fish show the physical nature that the swimming performance of the 3D topology optimization bionic fish is significantly better than the 3D lunate tail bionic fish. | Zhiqiang Xin Chuijie Wu | 2014 | Advances in Applied Mathematics and Mechanics2014，6，6： | 0 |
| 17 | Influence of wall motion on particle sedimentation using hybrid LB-IBM scheme显示文摘We integrate the lattice Boltzmann method(LBM) and immersed boundary method(IBM) to capture the coupling between a rigid boundary surface and the hydrodynamic response of an enclosed particle laden fluid. We focus on a rigid box filled with a Newtonian fluid where the drag force based on the slip velocity at the wall and settling particles induces the interaction. We impose an external harmonic oscillation on the system boundary and found interesting results in the sedimentation behavior. Our results reveal that the sedimentation and particle locations are sensitive to the boundary walls oscillation amplitude and the subsequent changes on the enclosed flow field. Two different particle distribution analyses were performed and showed the presence of an agglomerate structure of particles. Despite the increase in the amplitude of wall motion, the turbulence level of the flow field and distribution of particles are found to be less in quantity compared to the stationary walls. The integrated LBM-IBM methodology promised the prospect of an efficient and accurate dynamic coupling between a non-compliant bounding surface and flow field in a wide-range of systems. Understanding the dynamics of the fluid-filled box can be particularly important in a simulation of particle deposition within biological systems and other engineering applications. | Mussie A. Habte ChuiJie Wu | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，3： | 0 |
| 18 | A Novel Low-Dimensional Method for Analytically Solving Partial Differential Equations显示文摘This paper is concerned with a low-dimensional dynamical system model for analytically solving partial differential equations(PDEs).The model proposed is based on a posterior optimal truncated weighted residue(POT-WR)method,by which an infinite dimensional PDE is optimally truncated and analytically solved in required condition of accuracy.To end that,a POT-WR condition for PDE under consideration is used as a dynamically optimal control criterion with the solving process.A set of bases needs to be constructed without any reference database in order to establish a space to describe low-dimensional dynamical system that is required.The Lagrangian multiplier is introduced to release the constraints due to the Galerkin projection,and a penalty function is also employed to remove the orthogonal constraints.According to the extreme principle,a set of ordinary differential equations is thus obtained by taking the variational operation of the generalized optimal function.A conjugate gradient algorithm by FORTRAN code is developed to solve the ordinary differential equations.The two examples of one-dimensional heat transfer equation and nonlinear Burgers’equation show that the analytical results on the method proposed are good agreement with the numerical simulations and analytical solutions in references,and the dominant characteristics of the dynamics are well captured in case of few bases used only. | Jie Sha Lixiang Zhang Chuijie Wu | 2015 | Advances in Applied Mathematics and Mechanics2015，7，6： | 0 |
| 19 | Unsteady analysis of six-DOF motion of a 6:1 prolate spheroid in viscous fluid显示文摘Free-moving simulations of airplanes, submarines and other automobiles under extreme and emergency conditions are becoming increasingly important from operational and tactical perspectives. Such simulations are fairly challenging due to the extreme unsteady motions and high Re(Reynolds) numbers. The aim of this study is to perform a six-DOF motion simulation of a 6:1prolate spheroid that is falling in a fluid field. Prior to conducting the six-DOF simulation, some verification simulations were performed. First, a laminar flow past an inclined prolate spheroid at a Re number of 1000 and incidence angle of 45. with a tetrahedral mesh was simulated to verify the relevant targeted discrete method for an unstructured mesh. Second, to verify the LES(large eddy simulation) models and dependent parameters for the DDES(delayed detached eddy simulation), a turbulent flow past a sphere was performed at a subcritical Re number of 10000. Third, a steady maneuvering problem about a prolate spheroid pitching up from 0. to 30. incidence at a uniform angular velocity was established based on a dynamic tetrahedral mesh with changing topology and the ALE(arbitrary Lagrangian-Eulerian) method of fluid-structure coupling at a Re number of 4.2 × 10~6.Finally, two six-DOF motions of an inclined 6:1 prolate spheroid at an initial incidence of 45. were simulated at different Re numbers of 10000 and 4.2 × 10~6. | Ying Xiong Ying Xiong Hui Guan ChuiJie Wu | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，11： | 0 |
| 20 | A study on the random array generation method for moving sound source identification显示文摘Based on the problem that the generating method of random array structure is inefficient,a method is proposed to generate the random target arrays by using coaxial circular array in the polar coordinates in the premise that the array angular resolution of source identification is guaranteed.According to the principle of moving sound source identification,this work deduces the basic non-equidistance coaxial circular rings'radius,and generates target random arrays which were suitable for moving sound source identification through array partitioning,condition filtering in the polar coordinates and simulation evaluation.Finally,numerical simulation and moving car sound source identification test have been done.The analytical results show that using this method to generate random array is effective.Compared with the traditional regular arrays,the target random array has more accurate moving sound source identification performance. | WANG Yan LIU Zhihong WU Bobo YI Chuijie | 2015 | Chinese Journal of Acoustics2015，34，3： | 0 |
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