Open AccessStereo PIV measurements of oscillatory plasma forcing in the cross-plane of a channel flow
Author(s) -
Marc T. Hehner,
Lars H. von Deyn,
Jacopo Serpieri,
Saskia Pasch,
Timo Reinheimer,
Davide Gatti,
Bettina Frohnapfel,
Jochen Kriegseis
Publication year - 2021
Publication title -
international symposium on particle image velocimetry.
Language(s) - English
Resource type - Journals
ISSN - 2769-7576
DOI - 10.18409/ispiv.v1i1.117
Subject(s) - particle image velocimetry , turbulence , mechanics , physics , plasma actuator , flow (mathematics) , forcing (mathematics) , plane (geometry) , vortex , classical mechanics , optics , plasma , geometry , mathematics , atmospheric sciences , quantum mechanics , dielectric barrier discharge
The present work describes an experimental investigation that applies stereo particle image velocimetry in a cross-plane of a turbulent channel flow that is additionally perturbed by spanwise oscillatory body forces, induced by a plasma actuator and designed to mimic the effect of spanwise wall oscillations. The experiment is aimed at retrieving the forcing-correlated scales and the turbulent flow stochastic fluctuations for the measured cross-plane. The first are macroscopic scales and require a larger investigation domain while the latter benefit of a higher resolution. Furthermore, the extended flow-field dynamic range posed a challenge on the experiment design, finally leading to an optimal tradeoff. The results of the unactuated flow compare well to the direct numerical simulations of Hoyas and Jimenez ́ (2008), while the actuated case demonstrates strong near-wall momentum addition and spanwise modulation of the streamwise flow component.