| The modification of the turbulent cascade by polymeric additives is addressed by DNS of homogeneous isotropic turbulence of a FENE-P uid. According to the appropriate form of Karman-Howarth equation, two kinds of energy uxes exist, namely the classical transfer term and the coupling with the polymers. Depending on the Deborah number, the response of the ow may result either in a pure damping or in the depletion of the small scales accompanied by increased uctuations at large scale. The latter behavior corresponds to an overall reduction of the dissipation rate with respect to an equivalent Newtonian ow with identical uctuation intensity. The relevance of the position of the cross-over scale between the two components of the energy ux with respect to the Taylor microscale of the system is discussed.
for LaTeX users @article{EDeAngelis2005-531,
author = {E. De. Angelis and C. M. Casciola and R. Benzi and R. Piva},
title = {Homogeneous isotropic turbulence in dilute polymers},
journal = {J. Fluid Mech.},
volume = {531},
pages = {1-10},
year = {2005}
}
\bibitem{EDeAngelis2005-531} E. De.Angelis, C.M. Casciola, R. Benzi, R. Piva,
Homogeneous isotropic turbulence in dilute polymers,
J. Fluid Mech. {\bf 531} (2005) 1-10.EDeAngelis2005-531
E. De.Angelis, C.M. Casciola, R. Benzi, R. Piva
Homogeneous isotropic turbulence in dilute polymers
J. Fluid Mech.,531,2005,1-10 |
mk@mat.ethz.ch
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