Original title: Approximation of velocity distribution in open channel flow
Authors: Ivanova, Irina ; Vlasák, Pavel ; Chára, Zdeněk ; Kysela, Bohuš
Document type: Papers
Conference/Event: Engineering Mechanics 2010, Svratka (CZ), 2010-05-10 / 2010-05-13
Year: 2010
Language: eng
Abstract: 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.
Keywords: channel flow; lateral profile; logarithmic law; power law; spatial velocity profile; vertical profile
Project no.: CEZ:AV0Z20600510 (CEP), GA103/09/1718 (CEP)
Funding provider: GA ČR
Host item entry: Engineering Mechanics 2010, ISBN 978-80-87012-26-0

Institution: Institute of Hydrodynamics AS ČR (web)
Document availability information: Fulltext is available in the digital repository of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0185571

Permalink: http://www.nusl.cz/ntk/nusl-41448


The record appears in these collections:
Research > Institutes ASCR > Institute of Hydrodynamics
Conference materials > Papers