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Eighth International Symposium on Turbulence and Shear Flow Phenomena
August, 28-30, 2013, Poitiers, Futuroscope, France

DOI: 10.1615/TSFP8

SPECTRAL PROPERTIES OF THE TURBULENT FLOW OF A VISCOELASTIC FLUID FOR REDUCED DRAG

pages 1-6
DOI: 10.1615/TSFP8.1350
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RESUMO

In the present study, direct numerical simulation (DNS) results of fully developed turbulent channel flows of a viscoelastic fluid modeled as a polymer dilution in a Newtonian solvent are analyzed. The analysis is focused on the spectral properties of the turbulent stress and vorticity fields in order to contrast the properties of turbulence of viscoelastic and Newtonian fluids, and to quantify the effects of increased elasticity on the spectral behavior. The simulation results coupled with the spectral analysis justmentioned can be useful in further assessing the two classes of explanations that have been proposed by Lumley (1969) and De Gennes (1986) for the occurrence of polymer drag reduction.

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