Effect of a Circular Cylinder on Hydrodynamic Characteristics over a Strongly Curved Channel

Curved channels are one of the most fundamental units natural or artificial channels, in which there different kinds obstacles; these include vegetation patches, bridge piles, electrical tower foundations, etc., all present over a channel bend, and can significantly alter hydrodynamic characteristics when compared to bare bed. In this study, laboratory experiments numerical simulations were combined investigate effect circular cylinder on flow 180-degree U-shaped curved channel. Experimental data, including water depth three-dimensional velocity, was obtained by utilizing acoustic Doppler velocimetry (ADV), used calibrate verify simulation results Reynolds-Averaged Navier–Stokes (RANS) model FLOW-3D software. Numerical show that larger diameter leads an overall greater depth-averaged velocity at section, shear stress acting banks is placed, increase along concave bank convex bank. When placed 90° section increases, two weaker circulations with same direction found near surface; for submerged one, appear further downstream unlike emergent one. The degree variation than flowrate. As flowrate increases radius curvature decreases, secondary intensity correspondingly elevates. However, plays more important role does. For both submergent cylinders, large produces strength, but has strength summary, study provides valuable knowledge hydrodynamics around structures channel, could improve future design structures.