基于近壁RANS模型的光滑壁突变为粗糙壁条件下平板湍流流动预测
针对湍流边界层在光滑壁面突变为粗糙壁面条件下的典型流动问题,本文开展了数值模拟研究。研究对象为充分发展的平板湍流边界层,其光滑段基于动量厚度的雷诺数为Re_theta=5950。研究重点在于评估雷诺平均纳维斯托克斯（RANS）模型在预测由粗糙度突变引发的内部边界层（IBL）演化过程中的适用性。计算采用双层k-epsilon湍流模型,并通过引入水动力粗糙度长度y0,模拟粗糙壁面对平均流场与湍流结构的影响。结果显示,在粗糙段起始处下游形成明显的速度发展区,其中速度剖面表现出下层受粗糙度控制 ...
楚明翰
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