Please use this identifier to cite or link to this item:
Scopus Web of Science® Altmetric
Type: Journal article
Title: Decomposition of the Reynolds shear stress in a turbulent boundary layer modified by miniature vortex generators
Author: Chan, C.I.
Chin, R.C.
Citation: Physical Review Fluids, 2022; 7(5):054603-1-054603-20
Publisher: American Physical Society (APS)
Issue Date: 2022
ISSN: 2469-990X
Statement of
C. I. Chan, and R. C. Chin
Abstract: The investigation of the spanwise modulation of the Reynolds shear stress (RSS) distributions of a turbulent boundary layer modified by miniature vortex generators (MVGs) is performed, using an approach on a time-resolved velocity data set. The methodology is based on quadrant analysis of RSS to first identify the spatial and temporal information of the RSS events. We then apply the spanwise Fourier mode decomposition and triple velocity decomposition to obtain various statistics of the decomposed RSS events, including their conditional mean structures and actual mean skin friction contributions. In addition, the spanwise modification of the MVG on the RSS has been characterized by the fundamental and subharmonic modes of motions that scale with the spanwise separation distance (z) between MVG pairs. The interactions between the + z -scaled mode and subharmonic modes are further investigated using the scale-by-scale RSS transport equation [Kawata and Alfredsson, Phys. Rev. Lett. 120, 244501 (2018)]. Results show that the + z -scaled motion tends to strengthen due to the inverse cascade of its subharmonic modes of motions, allowing the + z -scaled motion to persist further downstream.
Keywords: Boundary layers; Structure & turbulence of boundary layers
Rights: ©2022 American Physical Society
DOI: 10.1103/physrevfluids.7.054603
Grant ID: ARC
Appears in Collections:Mechanical Engineering publications

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.