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

Abstract

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.

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Correspondence to De-zhong Wang.

Additional information

Project supported by National Natural Science Foundation of China (No. 51106095, 11575113).

Biography: Wei-guo Gu (1979-), Male, Ph. D., Engineer

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Gu, W., Li, Y. & Wang, D. Direct numerical simulation of the viscoelastic channel flow using Giesekus model with variable parameters. J Hydrodyn 31, 326–332 (2019). https://doi.org/10.1007/s42241-018-0144-0

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Key words

  • Viscoelastic fluid
  • Giesekus model
  • direct numerical simulation (DNS)
  • Variable parameters