分子動力学法による気体-表面散乱の解析 : 第1報, Lennard-Jones分子系によるシミュレーション

概要

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Rarefied gas flows in various situations are calculated successfully by the direct simulation Monte Carlo method. In the simulation, the Maxwell model, where a gas molecule reflects diffusely with the probability a and reflects specularly with the probability 1-a, is widely used for boundary conditions on solid surfaces. However, the value of a is determined empirically and varies greatly with conditions such as degree of contamination and temperature of the surface. Rational prediction of the value and analysis of the interaction between gas and solid surface are required. In this paper, the behavior of a gas molecule which collides onto the solid surface is simulated by the molecular dynamics method. The numerical results reveal that the scattering behavior of the gas molecule is neither specular, diffuse, nor Maxwell-type reflection, and that the sticking probability is affected by the initial gas velocity and the potential well depth.
一般社団法人日本機械学会の論文
1992-07-25