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首页> 外文期刊>International Journal of Heat and Fluid Flow >Higher-order and length-scale statistics from DNS of a decelerated planar wall-bounded turbulent flow
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Higher-order and length-scale statistics from DNS of a decelerated planar wall-bounded turbulent flow

机译：来自DNS的减速平面壁边界湍流的高阶和长尺度统计

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A DNS database is presented to document third- and fourth-order moments and their budgets for fully developed plane-channel flow and for strained plane-channel flow. The effect of straining has a similar effect on statistics, such as the skewness and flatness of velocities, as in an adverse-pressure-gradient (APG) boundary layer. In addition to higher-order statistics, some modeling implications are also described, including issues related to decomposition of the velocity-pressure gradient correlations, the assumption of dissipation isotropy and a fourth-order turbulence time scale. An analysis of two-point correlations along the inhomogeneous direction is made to include the effects of APG straining. This reveals the advantage of a one-point length-scale based on wall-normal velocity fluctuations as an alternative to the traditionally used length-scale based on turbulence kinetic energy. The present study should prove to be useful for turbulence modelers in need of data to develop and assess higher-than-second-order Reynolds-averaged Navier-Stokes closure models. Published by Elsevier Inc.
机译：提供了一个DNS数据库，用于记录三阶和四阶矩及其对于充分发展的平面通道流和应变平面通道流的预算。应变的影响与统计数据（例如，速度的偏度和平坦度）对统计的影响类似，就像在逆压梯度（APG）边界层中一样。除了高阶统计量外，还描述了一些建模含义，包括与速度-压力梯度相关性分解，耗散各向同性假设和四阶湍流时间尺度有关的问题。对沿非均匀方向的两点相关性进行了分析，以包括APG应变的影响。这显示了基于壁法向速度波动的单点长度刻度的优势，可以替代传统上基于湍流动能的长度刻度。对于需要数据来开发和评估高于二阶雷诺平均Navier-Stokes闭合模型的湍流建模者，本研究应被证明是有用的。由Elsevier Inc.发布

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