Direct numerical simulation of the viscoelastic channel flow using Giesekus model with variable parameters  

作　　者：Wei-guo Gu Yu Li De-zhong Wang 

机构地区：[1]School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Hydrodynamics》2019年第2期326-332,共7页水动力学研究与进展B辑（英文版）

基　　金：by National Natural Science Foundation of China(Grant Nos.51106095,11575113).

摘　　要：The paper presents a direct numerical simulation(DNS)for the drag-reducing channel flow using the 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 the Giesekus model at a high Weissenberg number.The Reynolds shear stress is reduced when the Weissenberg number increases.In this case,the turbulence generation and transportation are further weakened and increasingly approach to the values in the experiments.

关 键 词：VISCOELASTIC FLUID Giesekus model direct NUMERICAL simulation(DNS) VARIABLE parameters 

分 类 号：O3[理学—力学]