Abstract
Formative mechanism of secondary flow in turbulent open channel flow in corners with a 90-degree angle and a 45-degree angle are investigated using the flow visualization technique. The flow visualization were done in the streamwise view using fluorescent dye illuminated by a laser light sheet.It is found that the instantaneous secondary flows are formed when the counterrotating streamwise vortices on the bed wall and on the side wall oscillate alternately to the corner direction. Further in corners with a 90-degree angle, counterrotating streamwise vortices on the bed wall play important role of forming the instantaneous secondary flow.
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