期刊
出版社
ROYAL SOC
DOI: 10.1098/rsta.2016.0086
关键词
coherent structures; wall bounded flow; turbulence
资金
- ONR [N00014-15-1-2402]
The energetic motions in direct numerical simulations of turbulent pipe flow at Re-tau = 685 are investigated using proper orthogonal decomposition. The procedure is extended such that a pressure component is identified in addition to the three-component velocity field for each mode. The pressure component of the modes is shown to align with the streamwise velocity component associated with the large-scale motions, where positive pressure coincides with positive streamwise velocity, and vice versa. The streamwise evolution of structures is then visualized using a conditional mode, which exhibit a strong similarity to the large-scale, low-momentum motions. A low-pressure region is present in the downstream section of the structure, and a high-pressure region is present in the upstream section. This article is part of the themed issue 'Toward the development of high-fidelity models of wall turbulence at large Reynolds number'. (C) 2017 The Author(s) Published by the Royal Society. All rights reserved.
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