摘要
利用DSMC(DirectSimulationMonteCarlo)方法研究了大Rayleigh(瑞利)数条件下稀薄气体的二维Benard对流的特性。考察了流动的非定常演化过程及若干流动特征量随时间的变化特征,得到了与实验较为一致的结论。计算结果表明,当流动控制参数不断增大时,二维Benard对流从热传导状态过渡到热对流状态表现出明显的非定常演化特征。最后当瑞利数增大到一定程度后,流动显示出混沌的特征。
The new properties of Benard convection flows under large Rayleigh numbers in rarefied gas are investigated by Direct Simulation Monte Carlo method. Special emphasis is placed on the unsteady development of the flow and some other physical properties. It is shown that with the Rayleigh number increasing, the Benard flows exhibit aunsteady transition from stable conduction state to convection state and when the Rayleigh number increase to certain critical number, the Benard convection system transforms to a flow with chaotic properties.
出处
《空气动力学学报》
CSCD
北大核心
2002年第4期434-440,共7页
Acta Aerodynamica Sinica
基金
国家自然科学基金资助项目
项目编号(19902021)
