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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. Detailed record
	Strategie řízení odtržení mezní vrstvy Uruba, Václav ; Knob, Martin ; Popelka, Lukáš Experimental results of a boundary layer separation control in adverse pressure gradient are given. Three strategies are chosen: passive (wall roughness, vortex generator) and active (synthetic jet). The Time-resolved PIV method was used. Special attention was paid to dynamical effects. Detailed record
	Dynamika odtržení mezní vrstvy Uruba, Václav ; Knob, Martin ; Popelka, Lukáš Dynamics of separation process of a turbulent boundary layer subjected to adverse pressure gradient is studied experimetally. The Time Resolved PIV method is used to acquire spatiotemporal data. The flow-field in the vicinity of the separation zone is found to be extremely complex. Detailed record
	Application of TR-PIV Method to Turbulent Flow-Field Studies Uruba, Václav ; Knob, Martin The paper deals with conditions of correct application of the Time Resolved – Particle Image Velocimetry (TR-PIV) method to study a turbulent flow-field. The method is able to catch both spatial and temporal correlation of the velocity field simultaneously, However the method resolution is limited. Influence of those limitations on evaluated results is shown. The TR-PIV hardware fy DANTEC is taken into account. Detailed record
	Stručný přehled vírových identifikačních metod s aplikací na 2D PIV data Knob, Martin ; Uruba, Václav A brief survey of four basic vortex identification methods, namely the Q-criterion,the λ2 method, the Γ2 method and the Complex eigenvalue method, is given in this contribution. All the methods are investigated on an artificial flow- field as well as an unsteady signal, obtained by the TR PIV system. The results of all the methods are evaluated and compared. Detailed record
	Časově-prostorová analýza syntetizovaného paprsku Uruba, Václav ; Knob, Martin The Bi-Orthogonal Decomposition is applied to analyze the velocity data obtained from experiment on synthetic jet flow. The spatiotemporal velocity distributions are obtained by the PIV method in fast time sequence. Dynamical characteristic of the studied flow-field are presented. Detailed record
	Nestacionární chování rovinného paprsku, injektovaného do korýtkové kavity Knob, Martin ; Šafařík, P. ; Adamec, J. The unsteady behavior of a plane jet impining into a trough- like shaped cavity is studied in the range of jet hydraulic diamater based Reynolds numbers between 3000 and 20000, the cavity aspect ratios between 1:2 and 3:4 and, finally, for the impingement angles between 0 and 15°. It is explained in detail, that the jet- swinging is caused by the unsteady Coanda effect. Detailed record
	Experimentální a numerické vyšetřování nestacionárního chování impaktního proudu do korýtkové kavity Knob, Martin ; Antoš, Pavel ; Adamec, J. In this contribution, the unsteady behaviour of a jet impinging into a trough- like shaped cavity is discussed; the investigation is performed both experimentally and numerically. The unsteady character of this flow is considered a result of instability in otherwise symmetrical flow- field. The mechanism of the jet swinging is then identified as an action of the Coanda effect between a jet and a quasi- wall- jet. Detailed record
	Dynamika syntetizovaného paprsku Uruba, Václav ; Knob, Martin ; Popelka, Lukáš The paper presents recent results obtained in synthetic jet research in IT, Fluid Dynamics Department. The case in quiescent air is examined experimentally using time-resolved PIV method. Results concerning a synthetic jet mean characteristics and dynamics behaviour are presented. Detailed record
	Nestacionární charakteristiky impaktního proudění do korýtkové kavity Knob, Martin ; Antoš, Pavel ; Adamec, J. In this contribution, the unsteady behaviour of a jet, impinging into a trough cavity is described. The mechanism of the switching of the jet is clarified and the effect of the impingement angle is discussed. The problem was studied both experimentally and numerically. The numerical investigation is performed using a commercial package Fluent 6.1, while the experimental data are obtained using the hot- wire probe. The experimental and the numerical data are compared and discussed. Detailed record

See also: similar author names
11	Knob, Martin
2	Knob, Miloš

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