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Approximation of velocity distribution in open channel flow
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SYSNO ASEP 0342976 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Approximation of velocity distribution in open channel flow Author(s) Ivanova, Irina (UH-J) RID
Vlasák, Pavel (UH-J) SAI, ORCID, RID
Chára, Zdeněk (UH-J) SAI, ORCID, RID
Kysela, Bohuš (UH-J) SAI, ORCID, RIDNumber of authors 4 Source Title Engineering Mechanics 2010, Book of extended abstracts. - Prague : Institute of Thermomechanics AS CR, v. v. i., 2010 / Zolotarev I. - ISBN 978-80-87012-26-0 Pages article no. 030 Number of pages 8 s. Publication form CD-ROM - CD-ROM Action Engineering Mechanics 2010 Event date 10.05.2010-13.05.2010 VEvent location Svratka Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords spatial velocity profile ; channel flow ; vertical profile ; lateral profile ; power law ; logarithmic law Subject RIV BK - Fluid Dynamics R&D Projects GA103/09/1718 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20600510 - UH-J (2005-2011) Annotation The 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. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2011
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