000001775 001__ 1775
000001775 005__ 20141118153455.0
000001775 04107 $$acze
000001775 046__ $$k2010-05-10
000001775 100__ $$aIvanova, I. S.
000001775 24500 $$aApproximation of velocity distribution in open channel flow

000001775 24630 $$n16$$pEngineering Mechanics 2010
000001775 260__ $$bInstitute of Thermomechanics AS CR, v.v.i., Prague
000001775 506__ $$arestricted
000001775 520__ $$2eng$$aThe paper deals with approximation of spatial distribution of mean downstream velocity of sub-critical turbulent flow in an open rectangular channel with rough bed. New formulae of the local downstream velocity component Vx(y, z) dependence on the vertical coordinate y and lateral coordinate z were introduced. The vertical velocity profile was approximated by log-law and the power law was used to describe the effect of channel walls on the horizontal velocity profile. The suggested formulae of spatial downstream velocity component distribution were calibrated and verified using the experimental data obtained by PIV method. The proposed approximation is in good agreement with experimental data, the difference between experimental and calculated data is in range of 5 - 10% except the area near the channel’s corners and water level, where the maximal difference reaches 60% and 30% of experimental values, respectively. Introduction A velocity distribution of one-dimensional flow in open channels is traditionally described by a log-law or by a power law. The log-law and the power law can be used not only for vertical velocity distribution, but also for a lateral distribution of local velocity. In this paper we shall suppose that the spatial velocity distribution can be approximated by the log-law for the vertical velocity profile and by the power law for the horizontal velocity profile and for the description of the channel walls effect. A logarithmic law and power-law (see, e.g. Schlichting, 1979): u=

000001775 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000001775 653__ $$a

000001775 7112_ $$aEngineering Mechanics 2010$$cSvratka (CZ)$$d2010-05-10 / 2010-05-13$$gEM2010
000001775 720__ $$aIvanova, I. S.$$iKysela, B.$$iChára, Z.$$iVlasák, P.
000001775 8560_ $$ffischerc@itam.cas.cz
000001775 8564_ $$s481426$$uhttps://invenio.itam.cas.cz/record/1775/files/Ivanova-030-PT.pdf$$y
             Original version of the author's contribution as presented on CD, FLU.
            
000001775 962__ $$r1750
000001775 980__ $$aPAPER