Molecular Dynamics Simulation of Two Dimensional Flow Past a Plate
Molecular Dynamics Simulation of Two Dimensional Flow Past a Plate
复制标题
通过板的二维流动的分子动力学模拟
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
D. Evans
中科院分区：
文献类型：
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作者：
S. Cui;D. Evans
摘要我们描述了分子动力学模拟150，000个圆盘流过平板。使用改进入口流体流的速度和温度稳定性的算法进行模拟。在雷诺数为1.30和1.60时，观察到涡交替地从板的两个边缘剥离。在雷诺数为10.15时，流动表现出层流行为。我们测量了阻力系数的板作为雷诺数的函数，并描述了空间/时间的局部热力学变量的变化，（即密度，温度和压力）。相对较低的局部密度和温度的值被发现对应的旋涡的中心。尽管下游流体的温度和密度变化相对较大，但系统中所有位置的局部热力学平衡都得到了相当精确的满足。
Abstract We describe molecular dynamics simulations of ∼ 50,000 disks flowing past a plate. The simulations were performed using an algorithm which improves the velocity and temperature stability of the inlet fluid stream. At Reynolds numbers of ∼ 30 and ∼ 60, vortices were observed to alternately peel off the two edges of the plate. At a Reynolds number of ∼ 15, the flow showed the laminar flow behaviour. We measured the drag coefficient of the plate as a function of Reynolds number and describe the spatial/temporal variation of local thermodynamic variables, (i.e. density, temperature and pressure). Relatively low values of the local density and temperature were found to correspond with the centers of the vortices. In spite of relatively large variations in temperature and density in the down stream fluid, local thermodynamic equilibrium was satisfied with considerable accuracy at all positions in the system.