Open AccessPatterns of vortex generation behind a cylinder in a wall-bounded cross-flow during transition to turbulence
Author(s) -
В. М. Молочников,
А. Б. Мазо,
E. I. Kalinin,
A. A. Paereliy,
M. A. Kluev
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1677/1/012023
Subject(s) - reynolds number , cylinder , turbulence , wake , mechanics , kármán vortex street , vortex , physics , boundary layer , potential flow around a circular cylinder , spiral (railway) , vortex shedding , horseshoe vortex , flow (mathematics) , classical mechanics , geometry , vortex ring , mathematics , engineering , mechanical engineering
The paper elaborates on experimental investigation and direct numerical simulation of the wake flow behind a circular cylinder located near the wall of a rectangular channel. The study considers the Reynolds number range that covers transition to turbulence in the wake. Spiral fluid motion directed from the sidewalls to the channel center is revealed behind the cylinder for both positions of the cylinder considered in the study. The paper describes the effect of this motion on the critical Reynolds number corresponding to the onset of Karman vortex street and on the vortex topology. The spiral motion is shown to correlate with the onset of low-pressure regions behind the cylinder near the sidewalls. These regions result from the interaction between the boundary layer on the sidewalls and the separation region behind the cylinder.