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The experimental and numerical approach of two-phase flows by wall jets on rough beds in open channel flow
Ghoma, Mohamed Ibrahem Hussain, Khalid Tait, Simon J.
Ghoma, Mohamed Ibrahem
Hussain, Khalid
Tait, Simon J.
Publication Date
2014
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Abstract
This paper presents the results of investigations
carried out to study the effect of horizontal wall jets on a fixed
rough bed in an open channel. The study used both numerical
and experimental approaches. The numerical and experimental
studies are compared for validation. The main objective of this
study is to understand the effect of wall jets on a horizontal
fixed rough bed in an open channel.
The experimental study investigated the effect of wall jets on
a fixed horizontal bed, with a known roughness in an open
channel flume. A sid-looking Acoustic Doppler Velocimetry
(ADV) was used to measure the velocity profile of the flow at
different flow zones. The wave monitor was used to measure the
free surface during the experiments.
Computational fluid dynamics CFD simulations were
conducted in a rectangular channel to compare with the
laboratory tests using the volume of fluid VOF multiphase
method and K- ࢿ model. The two phase (water and air) was
used in this study. Computer simulations for the model were
used to predict the fluid horizontal velocity (u) revealing the
characteristics of the wall jet over different flow zones
(developing, fully developed and recovering zones).
The results showed that the velocity profiles distribution in
the stream wise direction in the channel were reasonable. The
reverse velocity was close to the wall jet and the maximum
reverse velocity was observed near the water surface. Also the
results showed that the depression was close to the wall jet.
The agreement between the results obtained from the
numerical and the experimental data were reasonable.
Version
Published version
Citation
Ghoma M, Hussain K and Tait SJ (2014) The experimental and numerical approach of two-phase flows by wall jets on rough beds in open channel flow. In: Proceedings of the World Congress on Engineering. 2-4 Jul 2014, London, UK. Vol II.
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Conference Paper