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| 1 | Numerical simulations of self-propelled swimming of 3D bionic fish school显示文摘Numerical simulations of self-propelled swimming of a three dimensional bionic fish and fish school in a viscous fluid are carried out. This is done with the assistance of a parallel software package produced for 3D moving boundary problems. This computational fluid dynamics package combines the adaptive multi-grid finite volume method, the immersed boundary method and VOF (volume of fluid) method. By using the package results of the self-propelled swimming of a 3D bionic fish and fish school in a vis- cous fluid are obtained. With comparison to the existing experimental measurements of living fishes, the predicted structure of vortical wakes is in good agreement with the measurements. | WU ChuiJie1 & WANG Liang2 1 State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China 2 Research Center for Fluid Dynamics, People’s Liberation Army University of Science and Technology, Nanjing 211101, China | 2009 | Science China(Technological Sciences)2009，52，3： | 23 |
| 2 | An adaptive version of ghost-cell immersed boundary method for incompressible flows with complex stationary and moving boundaries显示文摘An adaptive version of immersed boundary method for simulating flows with complex stationary and moving boundaries is presented.The method employs a ghost-cell methodology which allows for a sharp representation of the immersed boundary.To simplify the implementation of the methodology,a volume-of-fluid method is introduced to identify the immersed boundary.In addition,the domain is spatially discretized using a tree-based discretization which is relatively simple to implement a fully flexible adaptive refinement strategy.Finally,the methodology is validated by comparing it with numerical and experimental results on three cases:(1) the flow passing a circular cylinder at Re=40 and Re=100,(2) a periodic oscillation of a circular cylinder in fluid at rest and(3) the self-propelled fish-like swimming at Re=6400. | WANG Liang1 & WU ChuiJie2,3 1 School of Science,PLA University of Science and Technology,Nanjing 211101,China 2 State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China 3 School of Aeronautics and Astronautics,Dalian University of Technology,Dalian 116024,China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，5： | 11 |
| 3 | Experimental and numerical study of regular waves past a submerged breakwater显示文摘Laboratory experiments are performed to investigate the hydrodynamics around a submerged breakwater due to regular incident waves. With an in-house code, a constrained interpolation profile (CIP)-based model is employed to simulate this process. The model is built on a Cartesian grid system with the Navier-Stokes equations using a CIP method for the flow solver and an immersed boundary method (IBM) is used for the treatment of the solid body boundary. A more accurate interface capturing scheme, the tangent of hyperbola for interface capturing/slope weighting (THINC/SW) scheme, is used to track the free surface. The numerical results are compared with experimental data. Reasonably good agreement is achieved in terms of the wave profiles at six measuring stations, the flow velocities at three different space locations and the pressures of eight points on the surface of the submerged breakwater. Moreover, the water mass transfer over the breakwater is discussed using a two-phase VOF model and the wave spectrum is also presented for analysis. It is indicated that the present model can accurately predict the hydrodynamic characteristics of the wave over a submerged bar. Furthermore, the experimental data in the present work can provide reliable basic data, including the wave transformations, the velocities and the dynamic pressures, for the validation of other CFD models. | Bi-jin Liu Du Cheng Zhao-chen Sun Xi-zeng Zhao Yong Chen Wei-dong Lin | 2019 | Journal of Hydrodynamics2019，31，4： | 4 |
| 4 | A Micro-layer Model for the Lubrication Effect Near Collisions of Immersed Particles显示文摘A micro-layer model is proposed to account for the lubrication effect of liquid layer near collisions of immersed particles at moderate particle Reynolds number.This new model is to allow determination of the pressure profile within the micro-layer including the fluid inertia and viscosity.Then a correction based on the micro-layer model is applied to unsteady 3-D direct simulation of a particle approaching another one.The simulation is based on a modified immersed boundary method with direct force scheme.The quantitative agreement between numerical and experimental results validates the model presented in the study.The simulation results show that the fluid is squeezed prior to contact.When a particle approaches a flat wall or another particle,the lubrication force,obtained by integrating the pressure profile over the particle surface,is increased and prevents the particle from approaching.The model predicts that the velocity of approaching particle starts to decrease when separation distance of particles is less than 0.1dp,where dp is the particle diameter. | 李彦鹏 | 2006 | 过程工程学报2006，6，z2： | 1 |
| 5 | Large-eddy simulation of flows past a flapping airfoil using immersed boundary method显示文摘The numerical simulation of flows past flapping foils at moderate Reynolds numbers presents two challenges to computational fluid dynamics: turbulent flows and moving boundaries. The direct forcing immersed boundary(IB) method has been developed to simulate laminar flows. However,its performance in simulating turbulent flows and transitional flows with moving boundaries has not been fully evaluated. In the present work,we use the IB method to simulate fully developed turbulent channel flows and transitional flows past a stationary/plunging SD7003 airfoil. To suppress the non-physical force oscillations in the plunging case,we use the smoothed discrete delta function for interpolation in the IB method. The results of the present work demonstrate that the IB method can be used to simulate turbulent flows and transitional flows with moving boundaries. | YANG XiaoLei,HE GuoWei & ZHANG Xing The State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，6： | 1 |
| 6 | An Augmented IB Method&Analysis for Elliptic BVP on Irregular Domains显示文摘The immersed boundary method is well-known,popular,and has had vast areas of applications due to its simplicity and robustness even though it is only first order accurate near the interface.In this paper,an immersed boundary-augmented method has been developed for linear elliptic boundary value problems on arbitrary domains(exterior or interior)with a Dirichlet boundary condition.The new method inherits the simplicity,robustness,and first order convergence of the IB method but also provides asymptotic first order convergence of partial derivatives.Numerical examples are provided to confirm the analysis. | Zhilin Li Baiying Dong Fenghua Tong Weilong Wang | 2019 | Computer Modeling in Engineering & Sciences2019，，4： | 0 |
| 7 | An IB Method for Non-Newtonian-Fluid Flexible-Structure Interactions in Three-Dimensions显示文摘Problems involving fluid flexible-structure interactions(FFSI)are ubiquitous in engineering and sciences.Peskin’s immersed boundary(IB)method is the first framework for modeling and simulation of such problems.This paper addresses a three-dimensional extension of the IB framework for non-Newtonian fluids which include power-law fluid,Oldroyd-B fluid,and FENE-P fluid.The motion of the non-Newtonian fluids are modelled by the lattice Boltzmann equations(D3Q19 model).The differential constitutive equations of Oldroyd-B and FENE-P fluids are solved by the D3Q7 model.Numerical results indicate that the new method is first-order accurate and conditionally stable.To show the capability of the new method,it is tested on three FFSI toy problems:a power-law fluid past a flexible sheet fixed at its midline,a flexible sheet being flapped periodically at its midline in an Oldroyd-B fluid,and a flexible sheet being rotated at one edge in a FENE-P fluid. | Luoding Zhu | 2019 | Computer Modeling in Engineering & Sciences2019，，4： | 0 |
| 8 | CFD simulation of tidal current farm by using AL model显示文摘In this study,an efficient numerical method for predicting the wake interference of multiple turbines is presented.The actuator line (AL) model instead of the geometry-resolved method is adopted to represent the rotor.The large-eddy simulation (LES) is performed to predict wakes of multiple turbines operated in turbulent flows.An efficient immersed boundary (IB) method with moving least square reconstruction (MLS) is developed to model the nacelle and support structure of the tidal turbine.A simple wall function based on the MLS-IB method and boundary-layer equations is employed to compute the instantaneous wall shear stress.Laminar flow simulations of unsteady flows past a cylinder illustrate the accuracy of the wall function IB method.Finally,the proposed method is extended to study turbulent flow past tandem tidal rotors,in which the wake profile behind rotors is analyzed.The results are found to be in reasonable agreement with published data. | Cheng Liu Changhong Hu | 2019 | Journal of Hydrodynamics2019，31，1： | 0 |
| 9 | Mechanistic analysis of solid-liquid flow during injection显示文摘Direct injection of retinal cells into patients' eyes is a new and improved therapeutic method to address cataracts, but one challenge is that the survival rate of cells during injection is very low. To solve this problem, in this study, the force distribution on retinal cells in injectors with two needle shapes was analysed by coupling the discrete element method with computational fluid dynamics and implementation of an immersed boundary method. Two injectors were considered: one with a straight needle and the other with a curved needle. The velocities of retinal cells in the injector with a straight needle were slightly higher than those in the injector with a curved needle. In addition, injection speed greatly affected the force distribution on retinal cells, with the retinal cells near the piston subjected to the highest forces during injection. The forces on retinal cells strengthened with increases in both retinal cell concentration and piston displacement. | Jie Cai Chuan-Yu Wu Yu Guo Jiecheng Yang Xiaobao Zhao | 2019 | Particuology2019，17，3： | 0 |
| 10 | Parallel computing strategy for the simulation of particulate flows with immersed boundary method显示文摘A parallel computing strategy for the simulation of particulate flows with immersed boundary technique is proposed. This strategy can deal with the coupling between fluid and particle easily when particle crosses the boundaries of sub-domains which are decomposed from original computational domain. And a two- dimen- sional circular particle settling in a closed rectangular domain is simulated with the parallel technique and immersed boundary method to validate the parallel effi- ciency. | WANG ZeLi FAN JianRen LUO Kun | 2008 | Science China(Technological Sciences)2008，51，8： | 0 |
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