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中文摘要：
现在的纸采用直接模拟蒙特卡罗(DSMC ) 学习 Rayleigh-B é nard 的方法流动，在的地方温度比率对更低的板上面被修理到 0.1。为 0.01 的一个 Knudsen 数字( Kn )，当瑞利数字( Ra )增加，流动从热传导性的状态改变到对流状态在大约 Ra=1700 ，并且通过更低的板对 Ra 的热流动的计算关系在对古典试验性、理论的结果的好同意。为 Kn=0.05， Ra 的热传导性的州的遗体马厩，和增加不能触发热不稳定性。
英文摘要：
The present paper employs the direct simulation Monte Carlo （DSMC） method to study the Rayleigh-Bénard flows, where the temperature ratio of the upper to lower plate is fixed to 0.1. For a Knudsen number （Kn） of 0.01, as the Rayleigh number （Ra） increases, the flow changes from the thermal conductive state to the convective state at about Ra=-1700, and the calculated relation of heat flux through the lower plate versus Ra is in good agreement with classical experimental and theoretical results. For Kn=0.05, the thermal conductive state remains stable, and the increase of Ra cannot trigger thermal instability.
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