الفهرس 
LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
This thesis comprises of three parts, part 1 presents the study of
the main hydraulic features of flow as super-elevation, velocity
distribution, and the secondary flow using Large Eddy Simulation
(LES) without any protection for the bed and banks. In this part, a
suitable turbulent model is chosen in addition to checking of the
capability of this model. The results of a previous laboratory
experiments are used to validate the predicted results from the
numerical model. Part 2 aims to study the efficiency of a new
protection technique (water screen) to counteract of the secondary
flow numerically in addition to choosing the optimum flow ratio
for this technique. Part 3 presents the suitable transverse location
of the new technique close/a way the outer bank in the curved open
channel.
The results reveal that LES and realizable k-ε turbulent models are
capable to predict the main flow characteristics for the curved open
channel. The new technique (water screen) can counteract the
curvature-induced secondary flow on condition that the induced
flow from tube is not less than 20 % of main flow. The position of
water screen effect on the secondary circulation cell. The new
technique has a negative effect on the outer bank if the distance is
increased away the outer bank.