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Colloquium Fluid Dynamics 2011
Jonáš, Pavel ; Uruba, Václav
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. The Colloquium will be held in the building of the Institute of Thermomechanics AS CR.
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Dynamics of secondary flow in rectangular channel
Uruba, Václav ; Hladík, Ondřej ; Jonáš, Pavel
Secondary flow in straight channel of rectangular cross-section is studied experimentally. Special attention is devoted to dynamics of secondary vortices in channel corner. The stereo time-resolved PIV method is used to acquire time series of the 3-component vector fields in plane perpendicular to the channel axis. The dynamics of the vortical structures is studied using Proper Orthogonal Decomposition method giving the energetic modes.
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Identification of vortex structures in dynamicstudio software
Procházka, Pavel P. ; Uruba, Václav
Identification of vortex structures from experimentally gained velocity field is topical problem for last decades. Optimal identification method should detect vortex and its generation, evolution, interaction and decay both in time and in space. Since there is no exact definition of vortex structure, this task for any identification method is very difficult and results are not very often representative.layers characteristics, the mathematical model Abu-Darag was utilized in order to enable the prediction of the main boundary layer integral parameters.
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METHODS OF IDENTIFICATION OF COUPLED VORTEX STRUCTURES IN MOTION
Něnička, Václav ; Tesař, Václav ; Šonský, Jiří
Flow visualisation was performed of sections perpendicular to the axis through a jet. It reveaedl surprising complexity in the mixing region (outside the jet core. The images were processed by correlation in sub-images showing vortical motions suggesting the twisting and braiding movements of hair when a plait hairdo is made. For evaluation authors found useful the theory that measures entanglement in fluids by the corresponding algebra of braiding movements.
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