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Národní úložiště šedé literatury Nalezeno 4 záznamů.  Hledání trvalo 0.01 vteřin. 
Numerical and experimental modelling of transition in a separated boundary layer on the NACA63A421 airfoil
 Ďuriš, M. ; Popelka, Lukáš ; Příhoda, Jaromír ; Šimurda, David
The paper is concerned with numerical modelling of transition in a separated boundary layer. A transition model is based on the combination of empirical terms determining position of the transition and averaged Navier–Stokes equations closed by SST turbulence model. The model of transition is applied in computation of 2D flow past NACA63A421 airfoil. Computation is performed using commercial code Fluent 6.3.26, in which the transition model is implemented as a User-Defined-Function. Computed distributions of the pressure coefficient along the airfoil are verified by comparison with experimental data, which were obtained by measurements in a closed circuit wind tunnel at the constant Reynolds number and several angles of attack. The comparison proves the applicability of the implemented transition model.
Úplný záznam
DECOMPOSITION METHODS FOR A PIV DATA ANALYSIS WITH APPLICATION TO A BOUNDARY LAYER SEPARATION DYNAMICS
 Uruba, Václav
Separation of the turbulent boundary layer (BL) on a flat plate under adverse pressure gradient was studied experimentally using Time-Resolved PIV technique. The results of spatio-temporal analysis of flow-field in the separation zone are presented. For this purpose, the POD (Proper Orthogonal Decomposition) and its extension BOD (Bi-Orthogonal Decomposition) techniques are applied as well as dynamical approach based on POPs (Principal Oscillation Patterns) method. The study contributes to understanding mechanisms of a boundary layer separation process. The acquired information could be used to improve strategies of a boundary layer separation control.
Úplný záznam
Gold Electrodes Plasma Actuator for Flow Control
 Procházka, Pavel P. ; Uruba, Václav ; Šonský, Jiří
New kind of dielectric barier discharge plasma actuator will be described and tested inside a flow of low Reynolds number. An effect of the actuator will be shown. There will be employed simple profile as an example.
Úplný záznam
BEHAVIOR OF PIEZOCERAMIC TRANSDUCERS FOR SYNTHETIC JET ARRAY
 Dančová, Petra ; Trávníček, Zdeněk
The paper describes behavior of piezoceramic transducers, which are used like the actuators for synthetic jet array. This investigation focuses on a partial problem of the general task “a synthetic jet array interacting with a channel flow”. To choose similar transducers ensures right condition for these experiments.
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