Abstract
ABSTRACTThe effect of cylinder alignment on the turbulent bursting events and sediment entrainment around submerged circular and square cylinder within the scour hole are investigated in the present study. The quadrant analysis technique was employed to establish a correlation between the bursting events and the resulting coherent turbulent structures that affect the sediment entrainment process. The results indicate the existence of a strong horseshoe vortex system and excessive sediment entrainment within the equilibrium scour hole. The dominant longitudinal velocity component increases with the increase of the alignment angle of the square cylinders. The spectral analysis shows that the peak of power spectra and vortex shedding frequency decreases with the increase of the height of the cylinder. Also, the quadrant analysis of the bursting events shows that the Reynolds shear stress increases with the increase of hole size for the interaction events. The range of contributions of stress fraction towards the ejection and sweep events significantly increases with the increase of hole size.
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