Lattice Boltzmann Simulations of Particle-Particle Interaction in Steady Poiseuille Flow

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.     

新高考背景下大学物理实验课探索

为应对2020年山东省高等学校考试招生综合改革,不影响大学物理实验原有教学任务的完成和后续专业课程的学习,针对高中没选物理的学生采用线上线下并重的混合教学模式,构建“一个衔接”即“大学-高中衔接”;“一个结合”,即“群体-个体相结合”;“一个提升”即“综合实验能力的提升”的大学物理实验阶梯课程体系,在原来大学物理实验教学目标不变的情况下,经过一轮初期的教学实践,取得了不错的效果.     

完善实验室管理体制 提高经费使用效益

高校实验室是培养具有创新意识,专业技能的高素质人才的实践基地,在教学、科研和人才培养中发挥着越来越重要的作用。针对地方性高校实验经费中突出存在的问题,提出了几点关于实验室建设和管理方面的建议,从而实现资源优化配置,提高建设经费使用效益。     

ISO9000族标准在电工电子实验室建设中的应用

电工电子实验室建设是电子类高校建设的重要组成部分,许多电子类高校在电工电子实验室建设中存在不规范性,这些不规范严重阻碍了电子电工实验室的建设。为提高电工电子实验室质量,引入ISO9000族理念,针对电工电子实验室存在的问题,制定了电工电子实验室规范性建设方针、操作流程,构建了电子类高校实验室的质量保障体系。     

大学物理教学中数值模拟实验的设计和研究

结合大学物理、大学物理实验和数值计算模拟的特点,根据不同年级的学生分别设计了简谐振动合成、行星运动轨道和气体分子速率分布函数等三个计算机模拟实验。分析了每个计算模拟实验的设计思路,并对所解决的问题进行分类。通过实验教学,提高了教学效率,激发了学生的学习兴趣,培养了学生素质,起到了很好的效果。     

Boundary Slip and Surface Interaction： A Lattice Boltzmann Simulation

The factors affecting slip length in Couette geometry flows are analysed by means of a two-phase mesoscopic lattice Boltzmann model including non-ideal fluid-fluid and fluid-wall interactions. The main factors influencing the boundary slip are the strength of interactions between fluid-fluid and fluid-wall particles. Other factors, such as fluid viscosity, bulk pressure may also change the slip length. We find that boundary slip only occurs under a certain density （bulk pressure）. If the density is large enough, the slip length will tend to zero. In our simulations, a low density layer near the wall does not need to be postulated a priori but emerges naturally from the underlying non-ideal mesoscopic dynamics. It is the low density layer that induces the boundary slip. The results may be helpful to understand recent experimental observations on the slippage of micro flows.     

利用激光探测水下声场的理论研究

利用简化的一维物理模型，研究了激光束在水表面反射、散射时探测器在不同位置接收到反射、散射光光通量随时间的变化．结果表明：探测器接收到光通量的变化频率与水下声场的变化频率相同，为利用反射、散射光探测水下声场提供了理论依据，同时也对探测方法提供了基本思路．     

Lattice Boltzmann Simulation of Blood Flow in Blood Vessels with the Rolling Massage

The rolling massage manipulation is a classic Chinese massage, which is expected to improve the circulation by pushing, pulling and kneading of the muscle. A model for the rolling massage manipulation is proposed and the lattice Boltzmann method is applied to study the blood flow in the blood vessels. The simulation results show that the blood flux is considerably modified by the rolling massage and the explicit value depends on the rolling frequency, the rolling depth, and the diameter of the vessel. The smaller the diameter of the blood vessel, the larger the enhancement of the blood flux by the rolling massage. The model, together with the simulation results, is expected to be helpful to understand the mechanism and further development of rolling massage techniques.     

Lattice Boltzmann simulation of behaviour of particles moving in blood vessels under the rolling massage

The rolling massage is one of the most important manipulations in Chinese massage, which is expected to eliminate many diseases. Here, the effect of the rolling massage on a pair of particles moving in blood vessels under rolling massage manipulation is studied by the lattice Boltzmann simulation. The simulated results show that the motion of each particle is considerably modified by the rolling massage, and it depends on the relative rolling velocity, the rolling depth, and the distance between particle position and rolling position. Both particles' translational average velocities increase almost linearly as the rolling velocity increases, and obey the same law. The increment of the average relative angular velocity for the leading particle is smaller than that of the trailing one. The result is helpful for understanding the mechanism of the massage and to further develop the rolling techniques.     

Lattice Boltzmann simulations of a dumbbell moving in a Poiseuille flow

In this paper, the lattice Boltzmann method is applied to simulate a dumbbell moving in a pressure-driven flow in a planar channel with the stress-integration method for the evaluation of hydrodynamic force acting on the cylinders. The simulation results show that the dumbbell also has the important feature of the Segr\'e--Silberberg effect like a particle in a Poiseuille flow. The dumbbell trajectories, orientations, the cylinders vertical velocities and angular velocities all reach their equilibrium values separately independent of their initial positions. It is also found that the dumbbell equilibrium positions depend on the flow Reynolds number, blockage ratio and elastic coefficient. This study is expected to be helpful to understand the dynamics of polymer solutions, polymer synthesis and reaction, etc.