Numerical simulation of deflecting flow in a symmetric enlarged channel
Numerical simulation of deflecting flow in a symmetric enlarged channel
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DOI：
10.1007/s11630-007-0353-2
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发表时间：
2007-11
影响因子：
2.5
通讯作者：
H. Yoshikawa;Kazuyoshi Ichinomiya;Mizue Munekata;H. Ohba
中科院分区：
文献类型：
--
作者：
H. Yoshikawa;Kazuyoshi Ichinomiya;Mizue Munekata;H. Ohba
本文给出了突然膨胀的矩形通道内三维分离流动和传热的数值结果。使用有限差分法对纳维-斯托克斯和能量方程进行数值模拟。将三维计算结果与二维计算结果进行比较，显示了通道长宽比对流动的影响。随着长宽比的增加，从对称流到不对称流的转变出现在较低的雷诺数处。阐明了两个下游壁上两个不同分离流动区域的局部传热特性的细节。对于所考虑的纵横比，流动和传热的二维性几乎消失。
Numerical results of three-dimensional separated flow and heat transfer in a rectangular channel with a sudden expansion are presented in this paper. Numerical simulations of Navier-Stokes and energy equations are carried out using the finite difference method. The results of three-dimensional calculations are compared with the two-dimensional ones, and effects of the aspect ratio of channel upon the flow are shown. The transition from symmetric to asymmetric flow appears at lower Reynolds number as increasing the aspect ratio. The details of local heat transfer characteristics in two different separated flow regions on two downstream walls are clarified. Two-dimensionality of the flow and heat transfer almost disappears for the aspect ratio considered.