本文用具有QUICK方案的SIMPLE算法对底部加热的低Prandtl数流体自然对流换热进行了数值计算,研究了这种流动与换热问题数值解的分岔问题.计算发现,在2200＜Ra＜5000区间数值解不唯一.当Ra≤2200时,流动和换热是稳态的和唯一的,最终的流场是稳定的4涡型流场.当Ra≥5000时,流动和换热是非稳态的,流场分别有5涡型的和4涡型的两种,5涡型流场能够长期稳定地存在,但4涡型流场不会长期存在,当有足够的时间积累,会突然转变为5涡型流场.
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