Modeling Local Scour around a Cylindrical Pier with Circular Collar with Tilt Angles (Counterclockwise around the Direction of the Channel Cross-Section) in Clear-Water

This research explores how a circular collar with tilt angle (counterclockwise around the direction of channel cross-section) could affect local scour depth single cylindrical pier in clear-water based on Large Eddy Simulation (LES) six cases. The results show that horizontal is best for reducing depth. With increases angle, effect decreases gradually and even counterproductive at equilibrium. At early stage scouring, cases collars obvious scouring reductions. smaller is, better longer-lasting protection can provide. When than 5°, location maximum 90–115° (the measured clockwise from flow direction) both sides pier. greater range −115° to 115° close Significantly larger areas reach when increases. Compared Case 1 without collar), collar, topographies downwards 1.0D (D diameter bridge pier) are changed siltation scouring. topography changes increase shape long-narrow rectangle an equilateral triangle. study may provide valuable insights into