Abstract
The present study reports the effect of transcritical flow on velocity and shear stress distribution over a partially rough bed. Four series of runs have been performed in a right-angled open channel junction. Experimental data obtained from compound channel are used to compare with the simple ones. The physical size and geometry of roughness elements are chosen to encompass transcritical flow regimes. Using a small portion of the data recorded at each location using an acoustic Doppler velocimeter over a grid defined, an evaluation of transcritical flow in open channel junction is presented. The approach flow is subcritical followed by a transition to supercritical flow in the downstream branch channel is realized. Results show that the flow features around the junction are related to the strength of the secondary currents and turbulence quantities in shear layer increases with discharge ratio. Energy loss is associated with the bed shear stress exhibited is more in the simple channel than that of compound channel. The complete data-set describing transcritical flow at a 90° open channel junction is presented as a resource for the validation of 3D computational fluid dynamics codes that utilize a free surface model.
Published Version
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