Date:

2025-04-30

Title of Paper:

Direct Numerical Simulation on Drag Reducing Flow by Polymer Additives Using A Spring-Dumbbell Model

Journal:

Progress of Computational Fluid Dynamics

Summary:

Abstract: A discrete-element model (spring-dumbbell model) is used to investigate the
mechanism of drag-reduction by adding polymer in a turbulent channel flow of Newtonian fluid
by Direct Numerical Simulations (DNSs). By using this model, the spatial concentration of the
polymer can be obtained numerically. In this paper, the effect of the spring coefficient on the
drag-reduction is studied in detail. The quantitative relations between the drag-reduction rate and
viscoelastic and Reynolds shear stress, etc., are obtained. Discussions are performed to clarify the
relation between the turbulent structure of the polymer drag-reducing flow and the spring
coefficient of the discrete-element model.
Keywords: spring-dumbbell model; DNS; direct numerical simulation; drag-reduction; turbulent
channel flow.

Co-author:

Y. Wang, B. Yu, J. J. Wei, F. C. Li

Volume:

9

Page Number:

217-224

Translation or Not:

No

Date of Publication:

2009-03-18