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本文用具有QUICK方案的有限差分法对底部加热的低Prandtl数水平流体层自然对流换热进行了数值计算，研究了这种问题中存在的振荡和分歧问题。结果显示，在Ra的一定取值区间，有4涡型流场和5涡型流场两个解的分支。但在这个区间以外，最终的结果没有出现分歧。在所发现的两个解的分支中，问题由稳态转变为非稳态的临界Racr是不同的。
In this paper, the finite element method with QUICK scheme was used to numerically calculate the natural convection heat transfer in the low-level Prandtl-level fluid bed with bottom heating. The oscillation and bifurcation problems in this kind of problem were studied. The results show that there are two branches of solution of 4-eddy flow field and 5-vortex flow field in a certain range of Ra. However, outside of this interval, the final result did not diverge. Among the two branches of the solution found, the problem of transition from steady-state to non-steady-state critical Racr is different.