竖直加热平板对流边界层的数值模拟

为了研究壁面温度和来流速度对边界层特性的影响,采用计算流体动力学(computational fluid dynamics,CFD)软件对空气流过竖直加热平板的对流边界层特性进行数值模拟.采用k-ε模型和SIMPLE算法分别对不同壁面温度的自然对流和不同来流速度的混合对流进行模拟计算,得到温度分布和速度分布,通过分析结果表明:高温对边界层特性的影响很小,而随着空气来流速度的增大,速度边界层和热边界层的厚度减小,最大速度增大.

Numerical simulation of the convection boundary layer in air along a vertical heated plate

In order to study the effect of wall temperature and free stream velocity on the characteristics of the boundary layer, the characteristic in a convection boundary layer in air along a vertical heated plate was numerically simulated with CFD (computational fluid dynamics) software. The different wall temperatures for natural convection and the free stream velocity for the combined convection were simulated by the standard k ε mode1 and the SIMPLEC algorithm, and the flow fields information, such as distribution of velocity and temperature were computed and analyzed. The results showed that the effect of high temperature oncharacteristics of the boundary layer was quite small,  the thicknesses of velocity and thermal boundary layers decrease, and the maximum velocity increases with the free stream velocity increasing.