CA交通流模型的演化方程与转向概率效应

给出了二维CA交通流模型的演化方程和速度表达式．引入转向概率，在计算机上模拟了转向概率引起交通堵塞现象的临界密度和对交通状态的影响     

一维元胞自动机随机交通流模型的理论分析与计算机实验

在一维局部作用元胞自动机(CA)交通流模型中，引入刹车噪声与产生、消失概率，得到一个完全随机的CA交通流模型．利用平衡自旋理论对该模型的研究表明，当P_in＝P_out≠0时，初始密度分布不影响系统的最终状态，求得ρ_ｔ＝0.5；当满足条件P_in＋P_b＝1与P_in＝P_out时，得到简单的“线性”模型，该模型在条件｜1－2P_in｜＝1下，表现出长程相关，导致严重交通“阻塞”的出现．理论结果与计算机实验一致． 关键词：     

CA交能流模型的演化方程与转向概率效应

给出了二维ＣＡ交通流模型的演化方程和速度表达式，引入转向概率，在计算机上模拟了转向概率引起交通堵塞现象的临界密度和对交通状态的影响。     

一维元胞自动机随机交通流模型的宏观方程分析

在一维局部作用元胞自动机交通流模型中引入刹车噪声与产生、消失概率,得到一完全随机的元胞自动机交通流模型.利用玻耳兹曼近似,建立了该模型的宏观动力学方程,并对宏观方程在特殊条件下的解进行了理论分析和计算机模拟. 关键词： 元胞自动机 交通流 Burgers方程 激波     

霓虹形成的光学原理

用几何光学的方法对霓虹形成作了一般分析 ,并求出了霓虹可见时太阳的最大仰角。     

一维几率性细胞自动机演化的临界相变现象分析

本文用实位置空间重整化群方法对一类特殊的一维几率性细胞自动机演化的动力学方程进行了处理,得到该细胞自动机的演化存在相变,其临界点几率参数值为P₀=0,P₁=P₂=0.5,临界动力学指数z=2,并获得了大量的计算机实验资料。     

An Effective Method on Two-Dimensional Lattice Boltzmann Simulations with Moving Boundaries

We propose a lattice Boltzmann scheme for two-dimensional complex boundaries moving in fluid flow. The hydrodynamic forces exerting on the moving boundaries are calculated based on a stress-integration method proposed before, but the extrapolation procedure is avoided, and the stability of this model is improved. The accuracy and robustness are demonstrated by numerical simulations of a circular particle settling in a twodimensional vertical channel. The numerical convergence is studied by varying the time-step and the dimensionless particle sizes.     

Lattice BGK Simulations of the Blood Flow in Elastic Vessels

The lattice Boltzmann method is applied to study the flow in elastic blood vessels. The volume-flow rate increases considerably when the compliance constant of the blood vessel is below a critical value. There is a region of the compliance constant in which the average volume-flow rate is dramatically enhanced. A harmonic perturbation of the pressure does not change the behaviour of the average volume-flow rate while the harmonic wave attenuates very quickly along the tube when the resonant period is close to that of the input wave. The model, together with the simulation results, is expected to be helpful to understand the mechanism of the blood volume-flow rate related to the compliance constant of the blood vessel, especially on the dependence of the flux of human blood vessel under weather changes, which has medical significance.     

用格子Boltzmann方法模拟高雷诺数下的热空腔黏性流

对13速六方格子Bhatnagar-Gross-Krook模型进行改进,适当地选取弛豫时间τ和k,使得热流体的切黏滞系数μ与热导系数λ只与内能有关,流体的Prandtl数可调.用该模型模拟了高雷诺数下的各种边界空腔流 关键词： 格子Boltzmann方法 Bhatnagar-Gross-Krook模型 Prandtl数 空腔流