Nonlinear Couette flow in a dilute gas: Comparison between theory and molecular-dynamics simulation
Nonlinear Couette flow in a dilute gas: Comparison between theory and molecular-dynamics simulation
复制标题
稀气体中的非线性库埃特流动：理论与分子动力学模拟之间的比较
DOI：
10.1103/physreve.58.1836
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发表时间：
1998
影响因子：
2.4
通讯作者：
V. Garzó
中科院分区：
文献类型：
--
作者：
J. Montanero;V. Garzó
研究了一维稀气在平面库埃特流作用下的非线性输运特性。结果是由一个动力学模型得到的，该模型考虑了普朗特数的正确值。该解决方案的特点是恒定的压力和线速度和抛物线的温度分布相对于一个缩放变量。得到了主要输运系数作为减剪速率的非线性函数。与近期二维硬气体disks@D分子动力学模拟的比较。Risso和P. Cordero，物理学家。Rev. E . 56,489 ~1997！执行#。这样的比较表明，我们的结果比以前从其他近似中得到的结果更符合计算机模拟，特别是在导热张量的情况下。@s1063 - 651 x ~ 98 !03308 - x #
Nonlinear transport properties of a d-dimensional dilute gas subjected to a planar Couette flow are determined. The results are obtained from a kinetic model that accounts for the correct value of the Prandtl number. The solution is characterized by constant pressure and linear velocity and parabolic temperature profiles with respect to a scaled variable. The main transport coefficients are explicitly obtained as nonlinear functions of the reduced shear rate. A comparison with recent molecular-dynamics simulations of a bidimensional gas of hard disks@D. Risso and P. Cordero, Phys. Rev. E 56, 489~1997!# is carried out. Such a comparison shows that our results are in better agreement with the computer simulations than those previously derived from other approximations, especially in the case of the thermal conductivity tensor. @S1063-651X~98!03308-X#