Comparison of theory and direct numerical simulations of drag reduction by rodlike polymers in turbulent channel flows.
Numerical simulations of turbulent channel flows, with or without additives, are limited in the extent of the Reynolds number (Re) and Deborah number (De). The comparison of such simulations to theories of drag reduction, which are usually derived for asymptotically high Re and De, calls for some care. In this paper we present a study of drag reduction by rodlike polymers in a turbulent channel flow using direct numerical simulation and illustrate how these numerical results should be related to the recently developed theory.
Benzi
Roberto
R
Dipartimento di Fisica and INFN, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy.
Ching
Emily S C
ES
De Angelis
Elisabetta
E
Procaccia
Itamar
I