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Colloquium Fluid Dynamics 2012 : Proceedings
Uruba, Václav ; Jonáš, Pavel
The purpose of the Colloquium is to bring together experts on theoretical and experimental fluid mechanics from the academic institutes, universities and other research and development establishments and to offer the opportunity to exchange and update information on the solved problems and to serve as a forum for discussion with leading scientists.
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Symetrie turbulentních charakteristik uvnitř městské křižovatky
Kellnerová, Radka ; Jaňour, Zbyněk
The wind-tunnel modelling of dispersion is very sensitive to central symmetry. The asymmetry of concentration field inside the symmetrical model is often caused by two causes: inappropriate inlet conditions or non-symmetric set-up of model. The project has carried out the flow measurements by Laser Doppler Anemometer's probe merged into the tunnel. The aim was to investigate the flow processes inside the tunnel body-tube itself – i.e. without the model and inside the model of a symmetrical urban intersection. The influence of wind direction and model arrangement suppressing the lateral flow was tested. The largest deviations from symmetry were caused by the circumfluence of the measuring devices.
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Dynamika řízené odtržené mezní vrstvy
Uruba, Václav ; Knob, Martin
The results of experimental study on a boundary layer separation control are given in the paper. The boundary layer on a flat wall is subjected to adverse pressure gradient. Three control strategies have been chosen for the study, both passive (rough wall, vortex generator) and active (synthetic jet). The separation process is investigated using TR-PIV method. Dynamical aspects of the phenomenon are analyzed in details. The strategy of application synthetic jet is shown to be the most efficient.
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