Duvvuri Subrahmanyam, McKeon Beverley
Graduate Aerospace Laboratories, California Institute of Technology, Pasadena, CA 91125, USA.
Graduate Aerospace Laboratories, California Institute of Technology, Pasadena, CA 91125, USA
Philos Trans A Math Phys Eng Sci. 2017 Mar 13;375(2089). doi: 10.1098/rsta.2016.0080.
Phase relations between specific scales in a turbulent boundary layer are studied here by highlighting the associated nonlinear scale interactions in the flow. This is achieved through an experimental technique that allows for targeted forcing of the flow through the use of a dynamic wall perturbation. Two distinct large-scale modes with well-defined spatial and temporal wavenumbers were simultaneously forced in the boundary layer, and the resulting nonlinear response from their direct interactions was isolated from the turbulence signal for the study. This approach advances the traditional studies of large- and small-scale interactions in wall turbulence by focusing on the direct interactions between scales with triadic wavenumber consistency. The results are discussed in the context of modelling high Reynolds number wall turbulence.This article is part of the themed issue 'Toward the development of high-fidelity models of wall turbulence at large Reynolds number'.
本文通过突出流动中相关的非线性尺度相互作用，研究了湍流边界层中特定尺度之间的相位关系。这是通过一种实验技术实现的，该技术允许通过动态壁面扰动对流动进行有针对性的强迫。在边界层中同时强迫两个具有明确空间和时间波数的不同大尺度模式，并将它们直接相互作用产生的非线性响应与湍流信号分离出来进行研究。这种方法通过关注具有三重波数一致性的尺度之间的直接相互作用，推进了壁面湍流中大尺度和小尺度相互作用的传统研究。在高雷诺数壁面湍流建模的背景下讨论了结果。本文是主题为“迈向大雷诺数下壁面湍流高保真模型的发展”的特刊的一部分。
