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http://dx.doi.org/10.5407/jksv.2022.20.1.038

Interscale transport of the Reynolds stress in a turbulent boundary layer subjected to adverse pressure gradient  

Yoon, Min (Division of Mechanical Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of the Korean Society of Visualization / v.20, no.1, 2022 , pp. 38-44 More about this Journal
Abstract
An interscale transport of the turbulent kinetic energy (TKE) and Reynolds shear stress (RSS) is examined in an adverse pressure gradient (APG) turbulent boundary layer (TBL). The direct numerical simulation data of an APG TBL at Reτ = 834 and β = 1.45 is employed. The TKE and RSS transport equations are divided into large and small scales, leading to the introduction of interscale transport. The TKE mainly transfers from large scales to small ones in the outer region, and vice versa for the RSS. An interscale transport of TKE and inverse interscale transport of RSS are amplified by APG, and the latter results in the increase in large scales of TKE production. Some of outer large scales of enhanced TKE transfer to small scales and then dissipate by viscosity, and the remains dissipate turbulent-non-turbulent interfaces by turbulent transport.
Keywords
Interscale transport; Turbulent boundary layer; Direct numerical simulation;
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