Effect of Weissenberg number on the flow structure: DNS study of drag-reducing flow with surfactant additives

A second-order finite difference scheme was employed for the DNS study of drag-reducing flow with surfactant additives. We focus on the effect of Weissenberg number (nondimensional relaxation time) on the flow structures. The instantaneous flow structures and stress distribution at different elasticities are compared. The effects of Weissenberg number on turbulence statistics such as turbulence intensities, Reynolds shear stress and two-point correlation coefficients are also presented.