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 R., Ching E.S.C., De Angelis E., and Procaccia I. (2008). Comparison of theory and direct numerical simulations of drag reduction by rodlike polymers in turbulent channel flows. PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS, 77, 046309-1-046309-5 [10.1103/PhysRevE.77.046309].
Comparison of theory and direct numerical simulations of drag reduction by rodlike polymers in turbulent channel flows
DE ANGELIS, ELISABETTA;
2008
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
