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Turbulence characteristics of flow past submerged vanes

International Journal of Sediment Research 2020年第1期35卷 42-56页

作者： Himanshu Sharma Zulfequar Ahmad Department of Civil Engineering Institute of Infrastructure Technology Research and Management Department of Civil Engineering IIT Roorkee

submerged vanes are hydrofoils utilized to manage the sediment transport through the river by generating the turbulence in the flow in the form of helical *** vanes are placed in the flow with respect to its direction at angle of 10°to 40°.In the current study,an attempt has been made to study the effect of the introduction of vanes in form of rows on parameters like turbulence intensities,Reynolds stresses,turbulent kinetic energy,anisotropy index,and the velocity profile of the *** is observed that the profile of variation of turbulence intensities,turbulent kinetic energy,vertical Reynolds stress and velocity over three different marked verticals on a transect are nearly identical whereas a large scatter is observed in the variation of transverse Reynolds stress over the vertical of the aforementioned vertical *** observation suggests that flow turbulence is homogeneous over the vertical while scattering in the variation of the transverse Reynolds stress component may be attributed to the presence of secondary currents in the *** introducing rows of submerged vanes,the bed turbulence is reduced,hence,helping reduce many scour related *** is also observed that a vortex occurred at 0.85 times the height of the vane and the variation of turbulence quantities in the presence of vanes shows the existence of a peak in these *** is observed that as flow moves away from the vane rows,due to the interaction of vortices and the action of vorticity,vortices dampens down and the flow regains *** the introduction of submerged vane rows,bed shear stress reduces as fluid from the surface replaces the slow-moving fluid near the bed due to the secondary currents generated by the vanes leading to reduction in the magnitude of turbulence intensities,Reynolds stresses,and turbulent kinetic energy near the *** anisotropy index is observed to increase near the bed as induced secondary currents enhanced the turbulence

关键词： Turbulence Anisotropy submerged vanes Secondary currents Turbulence parameters

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