Near-wall patch representation of wall-bounded turbulence
Near-wall patch representation of wall-bounded turbulence
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DOI：
10.1017/jfm.2020.658
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发表时间：
2018-11
影响因子：
3.7
通讯作者：
S. Carney;B. Engquist;R. Moser
中科院分区：
文献类型：
--
作者：
S. Carney;B. Engquist;R. Moser
摘要最近的实验和计算研究表明，近壁湍流可以用普遍的小尺度自治动力学来表征，这种动力学是由大尺度结构调制的。我们制定的数值模拟近壁湍流在一个小的区域局限于边界，其大小尺度的粘性单位。为了模拟近壁湍流演化的环境，该公式考虑了通过域上边界的平均动量通量。模型的二维能谱和低阶单点统计与直接数值模拟计算的相应数量的比较表明，它成功地捕捉到了小尺度近壁湍流的动态。
Abstract Recent experimental and computational studies indicate that near-wall turbulent flows can be characterized by universal small-scale autonomous dynamics that is modulated by large-scale structures. We formulate numerical simulations of near-wall turbulence in a small domain localized to the boundary, whose size scales in viscous units. To mimic the environment in which the near-wall turbulence evolves, the formulation accounts for the flux of mean momentum through the upper boundary of the domain. Comparisons of the model's two-dimensional energy spectra and low-order single-point statistics with the corresponding quantities computed from direct numerical simulations indicate that it successfully captures the dynamics of the small-scale near-wall turbulence.