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Lattice Boltzmann Simulation of Sedimentation of a Single Charged Elastic Dumbbell in a Newtonian Fluid
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Based on the lattice Boltzmann method, the sedimentations of elastic dumbbells with different charges in a Newtonian fluid under the same and different initial conditions are simulated. Due to the polarizing effects, there are Coulomb forces exerted on the charged elastic dumbbells during their sedimentations, which change their original motions significantly. All of the numerical results show that, if the charged elastic dumbbells are released at offset-centreline positions with zero velocity and settle under gravity, they fall down vertically off the centreline and their orientations tend to be the horizontal finally, and the distances apart from the centreline increase with the increasing charges of the elastic dumbbells. 相似文献
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应用双晶衍射仪对MOCVD外延生长所得到的一个GaAlInP双异质结(DH)的单晶多层结构进行测试与分析。应用双晶衍射的动力学理论模拟此样品的摇摆曲线,并结合界面的融合、晶格崎变与缺陷的散射来解释测试结果。对衍射谱的展宽提供了合理的解释,比较肯定地确定了此样品的结构与晶体质量。涉及缺陷对衍射FWHM的展宽的解释与关于缺陷的半动力学衍射理论相比,简单明了,实用于实际的生产检测。并根据分析结论对晶体质量的改进提供技术方案,改进了晶体质量。 相似文献
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Lattice Boltzmann simulation of fluid flows in two-dimensional channel with complex geometries
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Boundary conditions (BCs) play an essential role in lattice
Boltzmann (LB) simulations. This paper investigates several most
commonly applied BCs by evaluating the relative L2-norm errors
of the LB simulations for two-dimensional (2-D) Poiseuille flow. It
is found that the relative L2-norm error resulting from FHML's
BC is smaller than that from other BCs as a whole. Then, based on
the FHML's BC, it formulates an LB model for simulating fluid flows
in 2-D channel with complex geometries. Afterwards, the flows
between two inclined plates, in a pulmonary blood vessel and in a
blood vessel with local expansion region, are simulated. The
numerical results are in good agreement with the analytical
predictions and clearly show that the model is effective. It is
expected that the model can be extended to simulate some real
biologic flows, such as blood flows in arteries, vessels with
stenosises, aneurysms and bifurcations, etc. 相似文献
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The moving behaviour of two- and three-particles in a pressure-driven flow is studied by the lattice Boltzmann simulation in two dimensions. The time-dependent values, including particles' radial positions, translational velocities, angular velocities, and the x-directional distance between the particles are analysed extensively. The effect of flow Reynolds number on particle motion is also investigated numerically. The simulation results show that the leading particle equilibrium position is closer to the channel centre while the trailing particle equilibrium position is closer to the channel wall. If Reynolds number Re is less than 85.30, the larger flow Reynolds number results in the smaller x-directional equilibrium distance, otherwise the x-directional distance increases almost linearly with the increase of time and the particles separate finally. The simulation results are helpful to understand the particle-particle interaction in suspensions with swarms of particles. 相似文献