直接模拟蒙特卡罗方法是一种求解稀薄气体流动换热新的数值方法。
The Direct Simulation Monte Carlo method is a useful numerical tool for solving fluid flow and heat transfer problem of rarefied gas.
由于尺度效应、表面效应等因素的影响，稀薄气体流动表现出自己的特点：流动涉及的表面积与体积之比增强、梯度参数效应，表面效应，流体极性等。
Some negligible factors in the classical fluid dynamics, such as, surface force, surface-volume ratio and the effects of gradient parameters, become very important for its study.
太阳风是一种高速但非常稀薄的从太阳向外流动的带电气体离子氢、氦流。
The solar wind is a high-speed but extremely tenuous stream of electrically charged gases—ionized hydrogen and helium—that flow outward from the sun.
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