【作者】 赖锡军； 汪德爟；

【Author】 LAI Xi-jun WANG De-guan (Nanjing institute of Geography & Limnology, CAS, Nanjing 210008, China; College of Environmental science and engineering, Hohai University, Nanjing 210098, China )

【机构】 中国科学院南京地理与湖泊研究所； 河海大学环境学院；

【摘要】 以基于Boussinesq假定的无量纲化的方程为自然对流计算的控制方程,采用非结构同位网格上的SIMPLEC算法计算了三维方腔内水和空气两种介质在受侧壁加热情况下的自然对流问题。计算的对流项同时采用了非结构网格中的二阶逆风格式和二阶中心差分格式近似。计算得到了稳态的三维流动结构和温度分布。而且,随着Ra数的增加,对流作用增强,三维流动特征更为显著。更多还原

【Abstract】 A three-dimensional numerical study has been performed to investigate natural convection in a cubic cavity subject to horizontal gradients of heat. The governing equation set in non-dimensional form is based on Boussinesq approximation. The SIMPLEC algorithm on unstructured grids is applied to compute air and water natural convection in cubic cavity and constant temperature is opposed on the both sides wall in the x-direction. Convection term is approximated as two-second upwind and central difference schemes. The steady three-dimensional flow structure and temperature distribution are obtained. And as the Ra number increase, the action of convection and the characteristic of three-dimensional flow become more obvious.更多还原