论文标题
对流混合对流的盖驱动腔的数值研究
A Numerical Study of Lid Driven Cavity with Mixed Convection
论文作者
论文摘要
在雷诺（Reynolds Number 5000）的盖子驱动腔中，已经对二维流进行了直接的数值模拟，并用水作为工作流体进行prandtl数字7。围栏的两个侧壁都是绝缘的（即绝热边界条件），而底部的板在较高的温度下，顶壁在较冷的温度下。通过在boussinesq-approximation范围内的低和中等大小的范围内，通过在不同的理查森数量上进行数值模拟，通过在不同的理查森数量上进行数值模拟来研究了底壁的加热和顶盖运动的影响。已经比较了三种标准病例，在第一种情况下，未考虑加热效果，仅研究板的剪切作用引起的流动。在第二种情况下，仅考虑加热效果，并忽略了剪切效果。在第三种情况下，加热和剪切作用的影响（即混合对流）。在所有三种情况下都计算了移动板上的阻力，并研究了温度对阻力力的影响。为了运行上述模拟，已经开发了代码，该代码通过将结果与Ghia等人的非加热情况进行比较来验证。
Direct Numerical Simulation have been carried out for a two dimensional flow in a Lid driven cavity at Reynolds number 5000 and Prandtl number 7 with water as the working fluid. Both the side walls of the enclosure are insulated(i.e. adiabatic boundary condition), while the bottom plate is at higher temperature and the top wall is at colder temperature. Effects of heating of the bottom wall and movement of the top lid have been investigated by conducting numerical simulations at different Richardson numbers by varying from low and moderate magnitudes within the limits of Boussinesq-approximation. Three standard cases has been compared, in the first case heating effects are not taken into account and only the flow due to shear action of the plate is studied. In the second case only the heating effects are taken into account and shear effects are neglected. In the third case effects of both heating and shear action is taken into consideration(i.e. mixed convection). Drag force on the moving plate is calculated in all the three cases and effect of temperature on the drag force is studied. For running the above simulation a code has been developed which is validated by comparing the results with Ghia et al for non-heating case.
