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Direct numerical simulations of spots

机译：点的直接数值模拟

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Although many properties of turbulent spots have been determined by laboratory measurements and flow visualization, there still remain unanswered questions about the mechanisms involved in the spreading of spots, the role of instability waves, and the structure of the turbulent flow within and the non-turbulent but modified flow outside spots, Direct numerical simulations offer detailed, well-resolved data which could reveal these mechanisms. A few such simulations have been done in flat plate boundary layers, in channel flows (Poisueille and Couette flows) and in pipe flows. Although one study has examined the growth and breakdown of instability waves at the edges and another has computed particle trajectories to determine where fluid is entrained, most of these studies have only reached the stage of establishing the correctness of the simulations by comparisons with features observed in laboratory flows. However, it is a reasonable expectation that in the near future, simulation studies will begin to make definitive statements about mechanisms of spot growth and propagation. [References: 23]
机译：尽管通过实验室测量和流动可视化已经确定了湍流斑的许多特性，但是仍然存在关于斑点扩散，不稳定性波的作用以及湍流内部和非湍流结构所涉及的问题的悬而未决的问题。但是修改了外部流点后，直接数值模拟提供了详细的，经过良好解析的数据，可以揭示这些机制。在平板边界层，通道流（Poisueille和Couette流）和管道流中都进行了一些这样的模拟。尽管一项研究已经检查了边缘处不稳定波的增长和破裂，另一项研究已经计算了粒子轨迹来确定流体被夹带的位置，但是这些研究大多数都只是通过与观察到的特征进行比较来确定模拟正确性的阶段。实验室流程。但是，可以预见的是，在不久的将来，模拟研究将开始就斑点生长和繁殖的机制做出明确的陈述。 [参考：23]

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