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Shedding Light into the Quasi-Laminarization Process

机译:使光进入准层化过程

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In this investigation, Direct Numerical Simulations (DNS) of turbulent spatially-developing boundary layers (SDBL) with prescribed Very Strong Favorable Pressure Gradients (VSFPG) are performed by means of the Dynamic Multi-scale Approach (DMA) developed by Araya et al. Although the prescription of an external VSFPG significantly reduces turbulence production, the flow never becomes completely laminar due to the finite value of the stream-wise Reynolds normal stress, and thus the flow is laminarescent. It has been observed that the flow becomes more anisotropic in the relaminarizing region. Furthermore, the total shear stresses can be represented as a linear function of the favorable pressure gradient in the near wall region.
机译:在这项研究中,通过Araya等人开发的动态多尺度方法(DMA)对具有规定的非常强的有利压力梯度(VSFPG)的湍流空间发展边界层(SDBL)进行了直接数值模拟(DNS)。尽管使用外部VSFPG的处方可显着减少湍流产生,但由于沿流雷诺法向应力的有限值,流动永远不会完全成为层流,因此流动是层流的。已经观察到,在再层化区域中流动变得更加各向异性。此外,总剪应力可以表示为在近壁区域中有利压力梯度的线性函数。

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