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National Repository of Grey Literature 5 records found  Search took 0.01 seconds. 
Velocity correlations in turbulent boundary layer on smooth and rough surfaces
 Uruba, Václav
The spatial velocity correlations within a turbulent boundary layer are evaluated from PIV experiments for two cases, boundary layer on smooth and rough walls respectively. Basic features of the two cases are shown. Typical length-scales and shapes of coherent structures could be estimated form the evaluated correlations.
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On The Structure Of Turbulent Boundary Layer On Smooth And Rough Walls
 Uruba, Václav ; Hladík, Ondřej
The turbulent boundary layer structure on the smooth and rough walls has been studied experimentally using PIV technique. The hairpin vortices have been detected. Topology and typical size of those structures substantially differ in the cases in question.
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Numerical modelling of the surface roughness effect on the energy losses in blade cascade
 Stanislav, J. ; Příhoda, Jaromír ; Šafařík, Pavel
The work deals with the application of rough wall model implemented in the commercial code FLUENT 6.1 for the solution of subsonic flow through the blade cascade SE1050. Numerical solution is compared with experimental data and the effect of wall roughness on energy losses is estimated for the subsonic flow regime.
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Numerická simulace proudění ve 2D kanále s drsnými stěnami
 Stanislav, J. ; Sládek, Aleš ; Příhoda, Jaromír
Numerical simulation of the 2D channel flow with rough walls was carried out by means of the commercial code FLUENT 6.1. Results were compared with experimental data for rough wall modelled by abrasive paper with grit of 60. The effect of the computational grid on velocity profiles near the wall and on the friction coefficient was tested.
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Modelling of rough-wall flow in a straight channel
 Stanislav, J. ; Šafařík, P. ; Příhoda, Jaromír ; Sládek, Aleš
The contribution deals with numerical solution of three-dimensional incompressible flow in the straight channel with rough walls using the commercial code FLUENT 6.1. The effect of the computational grid is investigated using k-epsilon turbulence model modified for the rough wall. Used versions of grids are analysed in detail and results are compared with experimental data.
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