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Session: Vortex Dynamics 2
Session starts: Tuesday 25 August, 15:00
Presentation starts: 16:15
Room: Room B

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Yoshiyuki Sakai (Institute for Hydromechanics, Karlsruhe Institute of Technology, Karlsruhe, Germany)
Markus Uhlmann (Institute for Hydromechanics, Karlsruhe Institute of Technology, Karlsruhe, Germany)
Genta Kawahara (Department of Mechanical Science and Bioengineering, Osaka University, Toyonaka, Japan)

Abstract:
Turbulent secondary flow in straight open ducts with rectangular cross-section are studied numerically by means of pseudo- spectral direct numerical simulation (DNS). Similarly to the corresponding closed duct flows, the mean streamwise vorticity pattern in turbulent open duct flows were found to be the statistical footprint of the most probable locations of the quasi-streamwise vortices. A major difference between the two configurations was found in the vicinity of mixed-boundary corners where noticeably persistent vortical structures exist.Turbulent secondary flow in straight open ducts with rectangular cross-section are studied numerically by means of pseudo- spectral direct numerical simulation (DNS). Similarly to the corresponding closed duct flows, the mean streamwise vorticity pattern in turbulent open duct flows were found to be the statistical footprint of the most probable locations of the quasi-streamwise vortices. A major difference between the two configurations was found in the vicinity of mixed-boundary corners where noticeably persistent vortical structures exist.