Effect of viscoelasiticity on the far-dissipation range of homogeneous isotropic turbulence

Effect of viscoelasiticity on the far-dissipation range of homogeneous isotropic turbulence

Nguyen, M.Q.
Simöens, S.
Delache, A.
El Hajem, M.
Bos, W.
Poole, R.

2015-08-28

The comparison of the results of direct numerical simulations of isotropic turbulence of Newtonian and viscoelastic fluid, based on the FENE-P model, provide evidence that viscoelasticity modifies qualitatively the behavior of the smallest scales: we observe a k⁻⁶ law in the far dissipation range of the energy spectrum and we show that it is a robust feature, roughly independent of the large-scale dynamics. It is further shown that the drag-reduction in such flows, as measured by the difference in energy dissipation between Newtonian and viscoelastic flow, strongly depends on the initial conditions.

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(c) 2015 the Authors