Abstract
We performed direct numerical simulations of a turbulent channel flow in viscoelastic fluids to assess various spatial scaling methods and to find a scaling method that can visualise the spatial features regardless of fluid properties. The Giesekus and Oldroyd-B models were used as constitutive equations to model the viscoelastic fluids alongside a Newtonian fluid. The initial scaling method that can consider local viscosity variations demonstrated an increase in the size of the velocity streaks and a decrease in the number of quasi-streamwise vortices, with no change in the observed spatial features of the turbulence structures. After scaling using the ratio of the wall friction coefficients, we observed typical spatial features of the principal turbulence structures that coincided with those of the Newtonian fluid. The results indicate that the characteristics peculiar to the turbulent flow of viscoelastic fluids can be predicted in a manner similar to that for Newtonian fluids.
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