An Experimental and Numerical Comparison of Flow Hydraulic Parameters in Circular Crested Weir Using Flow3D
Abstract: Circular crested
weirs consist of a circular crested of upstream and downstream walls. These
weirs are widely used in hydraulic engineering as water discharge structures
and can be used to control water level in channels and tanks. In the present
study, using Flow3D software, hydraulic properties were investigated to find
weir geometry optimization through CFD method. Also, this study attempted to
investigate flow on some sections of circular crested weirs in 3 groups and 11
models. Upstream and downstream slope changes as well as the height of the weir
were also studied. To validate the model, laboratory models were used. In the
research, flow depth parameters on crest, pressure distribution, velocity
distribution, energy loss on circular crested weirs, as well as the height and
changes of upstream and downstream slope were evaluated. Flow depth on the body
of circular crest in this state is about 0.71 (H1). Upstream slope changes on
flow depth on the weir’s crest revealed that increasing upstream slope causes
to the increase of flow relative depth (H1/R) on the crest about 62%.
Downstream changes in H1/R values less than 0.7 have no significant effect on
discharge coefficient; however, increasing H1/R values seems to cause more
change in slope.
Author: Farhad Ghazizadeh, M.
Azhdary Moghaddam
Journal Code: jptsipilgg160013
