On the Mechanism of Turbulent Coherent Structure (Ⅲ)——A Statistical and Dynamical Model of Coherent Structure and Its Heat Transfer Mechanism
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摘要: 在文献[1]、[2]的启发下,本文建立一个零压梯度下,考虑局部产生以及外来扰动涡旋的壁湍流边界层大涡拟序结构的统计及动力学模型.在此基础上对充分发展的宽明渠流动中壁面附近的热扩散进行了数值模拟,建立了边界层拟序脉动速度和温度的数据库,发现了与速度快慢条相对应的高低温流条及其随时间在展向的摆动.数值模拟结果与前人的计算和实验结果吻合很好.Abstract: Following Tsai&Ma[1] and Tsai & Liu[2],a statistical and dynamical near-wall turbulent coherent structural model with separate consideration of two different portions:locally generated and up-stream transported large eddies has been established.With this model,heat transfer in a fully developed open channel in the absence of pressure gradient is numerically simulated.Database of fluctuations of velocity and temperature has also been set.Numerical analysis shows the existence of high-low temperature streak caused by near-wall coherent structure and its swing in the lateral direction. Numerical results are in accordance with the computations and experimental results of other researchers.
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Key words:
- coherent structure /
- statistical and dynamical model /
- heat transfer
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