Flow structure, momentum and heat transfer around a chamfer corner square cylinder

This numerical study investigates the effects of asymmetric chamfering on the corners of a square cylinder of width W , focusing on the resulting flow structure, momentum, and heat transfer at a Reynolds number Re W = 150. Asymmetric chamfering is achieved by fixing the cut size ( C∗ = C/W = 0.5) of the side surfaces and varying the chamfer angle α from 0° to 45°. Flow structures and fluid forces vary significantly with α, as do the shear stress and surface pressure distributions around the cylinder. Unsteady vortical structures resulting from alternate vortex shedding play a crucial role in momentum and heat transport. Reynolds-averaged fields reveal that strong momentum transport in the wake enhances heat convection. Simultaneously, strong shear stress on the front and sides of chamfered cylinders governs heat transport in the boundary layer. As such, the shear stress and Nusselt number distribution around the cylinder show identical behavior. The combination of strong shear around the cylinder surface, momentum transport, and high vortex shedding frequency in the wake collectively increases heat transfer from the chamfered cylinder.