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The effect of viscoelasticity on the turbulent kinetic energy cascade

Published online by Cambridge University Press:  31 October 2014

P. C. Valente*
Affiliation:
LAETA/IDMEC/Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
C. B. da Silva
Affiliation:
LAETA/IDMEC/Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
F. T. Pinho
Affiliation:
CEFT/FEUP, University of Porto, Rua Dr Roberto Frias, 4200-465 Porto, Portugal
*
Email address for correspondence: pedro.cardoso.valente@ist.utl.pt

Abstract

Direct numerical simulations of statistically steady homogeneous isotropic turbulence in viscoelastic fluids described by the FENE-P model, such as those laden with polymers, are presented. It is shown that the strong depletion of the turbulence dissipation reported by previous authors does not necessarily imply a depletion of the nonlinear energy cascade. However, for large relaxation times, of the order of the eddy turnover time, the polymers remove more energy from the large scales than they can dissipate and transfer the excess energy back into the turbulent dissipative scales. This is effectively a polymer-induced kinetic energy cascade which competes with the nonlinear energy cascade of the turbulence leading to its depletion. It is also shown that the total energy flux to the small scales from both cascade mechanisms remains approximately the same fraction of the kinetic energy over the turnover time as the nonlinear energy cascade flux in Newtonian turbulence.

Type
Papers
Copyright
© 2014 Cambridge University Press 

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