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.
求解过渡领域的流动问题，是稀薄气体动力学的核心内容。
It is a kernel in the ratified gas dynamics to solve the flow problem in the transitional domain.
稀薄气体的流动是一个复杂的稀薄气体动力学问题。
The flow characteristic of rarefied gas is very complicated in its dynamics problem.
稀薄气体的流动是一个复杂的稀薄气体动力学问题。
The flow characteristic of rarefied gas is very complicated in its dynamics problem.
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