JIANG Changbo, WANG Gang, DENG Bin, LIU Yizhuang. PIV measurement of hydrodynamic characteristics of pier with a slot[J]. Advances in Water Science, 2014, 25(3): 383-391.
Citation: JIANG Changbo, WANG Gang, DENG Bin, LIU Yizhuang. PIV measurement of hydrodynamic characteristics of pier with a slot[J]. Advances in Water Science, 2014, 25(3): 383-391.

PIV measurement of hydrodynamic characteristics of pier with a slot

  • This paper investigates flow structures around a bridge pier with a slot by experimental data obtained with PIV (Particle Image Velocimetry). Dynamic structures of the flows are examined on the central vertical flow plane and horizontal planes at different heights. It is found that the presence of the slot reduces the rise of water surface in front of the pier and subcutaneously changes wake vortex structures behind the pier. The flows around the pier with a slot exhibit strongly three dimensional characteristics. The maximum relative width of the low velocity region beside the pier and that at the wake region located at z/h=0.45 vary approximately linearly with the value of w/b, w being width of the slot and b being width of pier. On the horizontal plane at z/h=0.75, the relative length of vortex pair behind the pier with a slot(w/b=0.5)is 70% of that in case of the traditional pier, whereas, on the plane z/h=0.15, it increases slightly. In addition, the relative width of the vortex pair remains as 1 all the time.
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