Open AccessDrag reduction in turbulent channel flow by spanwise oscillating Lorentz force
Author(s) -
Mei Dong-Jie,
Fan Bao-chun,
Leping Huang,
Gang Dong
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.6786
Subject(s) - drag , physics , turbulence , mechanics , lorentz force , boundary layer , classical mechanics , parasitic drag , intensity (physics) , reduction (mathematics) , flow (mathematics) , optics , mathematics , geometry , magnetic field , quantum mechanics
Direct numerical simulation (DNS) of a turbulent channel flow is carried out to investigate the effect and mechanism of using spanwise oscillating Lorentz force to reduce boundary layer friction.We discussed the influence of Lorentz force intensity St and oscillating frequency T+ on the drag reduction effect and turbulent burst events. The results suggest the varying tendencies with St or T+ of the frequency of the turbulent bursts events are opposite to the intensity of the turbulent bursts events,and there exists an optimal parameter to achieve the largest amount of drag reduction.The composite effect of St and T+ can be well described by the equivalent spanwise wall velocity W+.