摘要
采用两种时间推进数值方法,对封闭腔内层流自然对流换热进行了各种瑞利数(Ra)条件下的模拟研究,总结了流态转捩时所表现的数值模拟方面的某些现象规律.当瑞利数不大于106时,两种数值方法计算结果一致,计算精度高.当瑞利数大于106后,数值收敛及计算结果与网格数,网格疏密程度,时间步长,松弛因子等因素密切相关,而与所选择的两种数值方法无关.给出了封闭方腔自然对流流态转捩临界瑞利数.
Two unsteady numerical methods are used for the laminar natural convection flows for a series of Reyleigh numbers (Ra) in an enclosure. The numerical results with the two unsteady numerical methods are high accuracy for the case of Ra=10~6. The two unsteady methods are consistent with each other. When the Ra>10~6, the numerical convergence and calculating results of the laminar natural convection flow and heat transfer in an enclosed are related with the grid nodes, the node density(B), the time increment (t) and the iteration factors, but not related with the two methods of the unsteady numerical simulations used. The transition from laminar to turbulence for the natural convection flow in a square cavity is given.
出处
《华中科技大学学报（城市科学版）》
CAS
2004年第3期14-17,共4页
Journal of Huazhong University of Science and Technology
基金
教育部博士点基金资助项目(20020487018).
