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*** Song won the Fellow Awards of the International Association for Computational Mechanics

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Science China(Physics,Mechanics & Astronomy) 2012年第12期55卷 2492-2494页

作者： wu chuijie State Key Laboratory of Structural Analysis for Industrial Equipment&School of Aeronautics and Astronautics Dalian University of TechnologyDalian 116024China

Professor Song Fu won the International Association for Computational Mechanics（IACM） Fellow Awards in praise for his outstanding contributions in the field of the turbulence simulation in a special Award Session at... 详细信息

关键词：计算力学研究员协会国际

Preface to the Special Topic on Fluid Mechanics

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Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 247-249页

作者： wu chuijie Dalian University of Technology

The science of fluid dynamics describes the motion of liquids and gases and their interaction with various bodies, It is a broad, interdisciplinary field that relates almost every aspect of our daily lives, and has a key role in science and engineering. Fluid dynamics impacts transportation, manufacturing, medicine, biology, energy, defense, homeland security and the environment. Predicting the aerodynamic performance of airplanes, automobiles, and ships, the flow of blood in the human body,

关键词：流体力学空气动力学性能流体动力学专题气体介质国土安全血液流动跨学科

Numerical investigation of dynamical behavior of tethered rigid spheres in supersonic flow

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Applied Mathematics and Mechanics(English Edition) 2016年第6期37卷 749-760页

作者： Tao LI Jingxia SUI chuijie wu State Key Laboratory of Structural Analysis of Industrial Equipment Dalian University of Technology School of Energy and Power Engineering Dalian University of Technology

The dynamical behavior of two tethered rigid spheres in a supersonic flow is numerically investigated. The tethered lengths and radius ratios of the two spheres are different. The two spheres, which are centroid axially aligned initially, are held stationary first, then released, and subsequently let fly freely in a supersonic flow. The mean qualities of the system and the qualities of the bigger sphere are considered and compared with the situations without the tether. In the separation process, six types of motion caused by the spheres, tether, and fluid interaction are found. The results show that the mean x-velocity of the system changes in a different manner for different radius ratios, and the x-velocity of the bigger sphere is uniformly reduced but through different mechanisms.

关键词： dynamical behavior supersonic flow tethered sphere

Research on the optimal dynamical systems of three-dimensional Navier-Stokes equations based on weighted residual

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Science China(Physics,Mechanics & Astronomy) 2016年第4期59卷 78-85页

作者： NaiFu Peng Hui Guan chuijie wu State Key Laboratory of Structural Analysis for Industrial Equipment School of Aeronautics and AstronauticsDalian University of Technology State Key Laboratory for Turbulence and Complex Systems Center for Applied Physics and TechnologyCollege of Engineering Peking University College of Meteorology and Oceanography PLA University of Science and Technology

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.

关键词： optimal dynamical systems weighted residual three-dimensional Navier-Stokes equations vortex structures

Influence of wall motion on particle sedimentation using hybrid LB-IBM scheme

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Science China(Physics,Mechanics & Astronomy) 2017年第3期60卷 55-73页

作者： Mussie A. Habte chuijie wu School of Aeronautics and Astronautics Dalian University of Technology Dalian 116024 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian 116024 China

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.

关键词： particle collisions lattice Boltzmann method immersed boundary method hard sphere molecular dynamics harmoni coscillation

Shape optimization of the caudal fin of the three-dimensional self-propelled swimming fish

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Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 328-339页

作者： XIN ZhiQiang wu chuijie College of Mechanics and Materials Hohai University State Key Laboratory of Structural Analysis for Industrial Equipment & School of Aeronautics and Astronautics Dalian University of Technology

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 *** 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 *** shape optimizations of various swimming speeds,the results show that the optimal caudal fins of different swimming modes are not exactly the same ***,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 ***,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 *** study of vortex dynamics reveals the nature of efficient swimming of the 3D bionic fish with the lunate caudal fin.

关键词： 3D bionic fish caudal fin shape optimization swimming performance vortex dynamics

A study of a three-dimensional self-propelled flying bird with flapping wings

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Science China(Physics,Mechanics & Astronomy) 2015年第9期58卷 52-67页

作者： ZHU LinLin GUAN Hui wu chuijie State Key Laboratory of Structural Analysis for Industrial Equipment School of Aeronautics and Astronautics Dalian University of Technology College of Meteorology and Oceanography PLA University of Science and Technology

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.

关键词： self-propelled bird flying numerical simulation three-dimensional

Optimal dynamical systems of Navier-Stokes equations based on generalized helical-wave bases and the fundamental elements of turbulence

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Science China(Physics,Mechanics & Astronomy) 2016年第11期59卷 61-69页

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.

关键词： optimal dynamical systems helical-wave decomposition fundamental elements of turbulence vortex structures

Numerical simulations and vorticity dynamics of self-propelled swimming of 3D bionic fish

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Science China(Physics,Mechanics & Astronomy) 2012年第2期55卷 272-283页

作者： XIN ZhiQiang wu chuijie College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China State Key Laboratory of Structural Analysis for Industrial Equipment&School of Aeronautics and Astronautics Dalian University of TechnologyDalian 116024China

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 ***,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 *** the change of swimming speed,the contributions of the fish body and caudal fin to thrust are analyzed *** relationship between vortex structures of fish swimming and the forces exerted on the fish body are also given in this ***,the 3D wake structure of self-propelled swimming of 3D bionic fish is *** in-depth analysis of the 3D vortex structure in the role of 3D biomimetic fish swimming is also performed.

关键词： 3D bionic fish self-propelled swimming boundary vorticity-flux 3D vortex structure