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Boundary Layer on the Flat Plate with Roughness Strip
Skála, Vladislav
Effect of the roughness strip on the boundary layer development on a flat plate was studied experimentally. A special model of a flat plate was designed. Experiment was made in non perturbed flow. Smooth flat plate (with super elliptical leading edge) was equipped with short roughness strip (close to the leading edge). Profiles of total pressure along the boundary layer were measured using flattened Pitot tube. First basic results of experiments are presented.
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Laminar-Turbulent Transition in View of Flow Separation from Isothermal and Heated Cylinder
Pech, Jan
This work presents insight to the laminar-turbulent transition in flow around cylinder through a numerical simulation, both in isothermal and heated case. The flow is modelled directly as a solution to the Navier-Stokes and Navier-Stokes-Fourier system. Reynolds numbers are considered in range 100-20000, ratio of cylinder-wall and upstream temperature is up to 1.5. Curves representing evolution of separation positions in time provide novel insight to vortex formation. Various regimes are recognized and some of them can be assigned to phenomena described formerly in experiment.
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O stopě turbulence a tišině
Jonáš, Pavel
The purpose of the contribution is to collect information on the generation, propagation and coalescence of turbulent spots and calmed regions in a transitional boundary layer. The appreciation of the behaviour of both turbulent spot and calmed region under turbulent free stream is the focus of this study.
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Strategie řízení mezních vrstev
Uruba, Václav
A review of flow control strategies which could be applied on wall turbulent flows is presented. Control goals are related namely to transition to turbulence and boundary layer separation. A special attention is paid to active control strategies involving hydrodynamically driven oscillatory actuators, particularly synthetic jets.
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