Journal of Food, Agriculture and Environment

Experimental study on ten modes of transverse waves due to vertical cylinders in open channels

Author(s):

Ahmad Jafari ^1*, Mehdi Ghomeshi ², Mahmood Bina ³, Seyed Mahmood Kashefipour ⁴

Recieved Date: 2010-01-13, Accepted Date: 2010-04-11

Abstract:

There are many conditions in open channel flows where the steady flow of water passes through a cluster of vertical cylinders. These vertical cylinders may represent piers of bridge, jetty or vegetation on the floodplain of rivers. In this paper, attention is focused on the transverse waves generated in an open channel, where the flow passes through a cluster of rigid vertical cylinders. The wooden circular cylinders with different diameters were screwed into the bed of the flume at different setting up patterns and spacing. The waves were produced from the periodic forces created by the vortex shedding from the cylinders. In specific conditions, these forces may create transverse waves with maximum amplitude in the channel. A comprehensive set of experiments (760 in total) were conducted in flume. In some of the experiments (119 Exp.), the flow was submerged on the obstructions and for some of these experiments, the waves were still formed. In this study, the height of the outlet control weir was changed from the highest to the lowest levels, with ten modes of oscillation occurring across the laboratory flume for each sequence. The discharge of flow varied from 2.2 to 25 l/s. The results provided an explanation for different wave formations that might occur due to vortex shedding for free and submerged flow on the obstructions. Finally, a new formulation was obtained from dimensional analysis to estimate the amplitude of the transverse wave generated by vortex shedding in open channels.

Keywords:

Transverse wave, vertical cylinders, wave amplitude, open channels

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Environment
Pages: 949-955

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