Direct Numerical Simulation of the Viscoelastic Channel Flow Using Giesekus Model with Variable Parameters
The paper performs a direct numerical simulation for the drag-reducing channel flow using Giesekus model with variable parameters. It is assumed that the relaxation time in the constitutive equation is varied depending on the local shear rate. The maximal drag reduction rate is obtained when variable parameters are applied in Giesekus model at high Weissenberg number. The Reynolds shear stress is reduced when Weissenberg number increases. In this case, the turbulence generation and transportation are further weakened and increasingly approaches to that in experiments.
Key wordsViscoelastic Fluid Giesekus Model DNS Variable Parameters
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