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Collection's Items (Sorted by Submit Date in Descending order): 1 to 9 of 9
Uruba, Václav , Procházka, Pavel , Skála, Vladislav
On the 3D dynamics of the wake behing a circular cylinder

Flow in the wake of a circular cylinder is studied experimentally using time-resolved stereo PIV method. Special attention is paid to 3D topology of dynamical structures. While the distribution of statistic quantities along the cylinder is uniform, and i.e. 2D, the instantaneous flow&#x...

Uruba, Václav , Procházka, Pavel , Skála, Vladislav
Structure of the Wake Behind an Airfoil

The wake behind an inclined plate simulating airfoil is to be studied experimentally. The vortical structures are identified eventually. Theirs topology and dynamical behaviour is to be studied in details using the Proper Orthogonal Decomposition method. The stereo time resolved Particle Ima...

Uruba, Václav , Procházka, Pavel , Skála, Vladislav
Anisotropy of Turbulent Flow around an Airfoil

The flow around an airfoil is analyzed from the point of view turbulence anisotropy assessment. The turbulent flow-field in the vicinity of an airfoil is populated by vortices, in some locations they tend to regularity in orientation, i.e. to anisotropy. However in the wake be...

Procházka, Pavel , Uruba, Václav
Reynolds Number Effect on Velocity Field and on Coherent Structures behind a Cylinder

The Particle Image Velocimetry was used to investigate the coherent structures behind a cylinder under moderate Reynolds number. Dynamical decomposition method was used to detect flow patterns having similar frequency as the vortex shedding frequency which is given by Strouhal number. The&#x...

Procházka, Pavel , Uruba, Václav
On the Recirculation Zone Behind a Cylinder of Finite Length with Subcritical Aspect Ratio

The Particle Image Velocimetry is utilized to investigate flow behind a cylinder of finite length with subcritical value of Aspect Ratio (AR). The cylinder is submitted to uniform freestream with very low intensity of turbulence and thin laminar boundary layer. The flow field canno...

Uruba, Václav
Reynolds Number in Laminar Flows and in Turbulence

Reynolds number is the basic parameter determining the flow-field topology and its evolution in time unambiguously if only inertial, pressure and viscous effects are involved. However the Reynolds number definition is not unique and its physical meaning depends strongly on its actual de...

Uruba, Václav , Procházka, Pavel
POD Spectrum of the Wake behind a Circular Cylinder

The wake dynamics behind a long circular cylinder in cross-flow was studied using the POD method. The temporal parts of POD modes, Chronoses, are subjected to frequency analysis. Five groups of modes are distinguished according to the frequency contents. The low order high energy&#...

Uruba, Václav , Procházka, Pavel
Dynamics of the Tip Vortices in the Wake Behind a Circular Cylinder of Finite Length

The dynamics of the tip vortices in the wake behind a wall-mounted finite-length circular cylinder of the aspect ratio 2 was studied experimentally using time resolved stereo PIV technique. The cylinder was mounted normal to a ground plane and it was subjected to a cross-flow&...

Uher, Jan , Milčák, Petr , Škach, Radek , Fenderl, David , Žitek, Pavel , Klimko, Marek
Experimental and Numerical Evaluation of Losses From Turbine Hub Clearance Flow

Long-term efforts have been made to understand loss generation and its reduction in the field of axial turbomachines. The traditional approach to losses for an isolated blade row considers the profile and the secondary losses as a result of viscous flow. The additional kinds o...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 9 of 9