2013 1(12)

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Mazo A.B.1, Kalinin E.I.1, Molochnikov V.M.2

1 Kazan (Volga Region) Federal University, Kazan, Russia
2 Research Centre for Power Engineering Problems, Kazan Scientific Centre (KNC) of RAS, Kazan, Russia


Mazo, A.B., Kalinin, E.I. and Molochnikov, V.M., (2013) The features of laminar-turbulent transition past an obstacle in a channel, Modern Science: Researches, Ideas, Results, Technologies, Iss. #1(12), PP. 231 - 236.


laminar-turbulent transition; spanwise rib; channel with cross section; rectangular; flow visualization; direct numerical simulation; large-scale vortical structures


An experimental study of 3D separation flow of viscous fluid over a semi-cylindrical obstacle in a rectangular channel was performed. Laminar and transition to turbulence flow regimes were considered. Experimental study was supplemented by the results of direct numerical simulation of considered flow. Numerical solution was verified against visual and PIV analysis of data obtained from the experiment. It was shown that laminar – turbulent transition, which occurs in a zone of flow separation, results from flow features related to transverse instability of the flow. In order to reveal and analyze these features a detailed study of flow structure was carried out on a consecutive stages of laminar – turbulent transition. As a result of this study dynamics of the flow structure, evolution of large eddies in the wake of the obstacle, formation and development of velocity and pressure pulsations during the laminar – turbulent transition were described and analyzed.


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