We address the dynamics of viscoelastic wall turbulence by means of a generalization of a scale-by-scale approach extended to both an inhomogeneous and viscoelastic case. Analysing the results obtained by a series of Direct Numerical Simulations of a dilute polymer solution in a plane channel, we focus our attention on the alteration of the inertial transfer across the scales and the polymer scale-dependent term in the budget for the second order velocity structure function. We confirm that both these observables lead to a scenario were the main alteration of turbulence structure in a channel flow occurs in the buffer layer.
Dynamics of viscoelastic wall turbulence in different ranges of scales / DE ANGELIS, Elisabetta; Casciola, Carlo Massimo; Piva, Renzo. - STAMPA. - 131:(2010), pp. 195-198. (Intervento presentato al convegno 3rd Conference on Turbulence, iTi 2008 tenutosi a Bertinoro; Italy) [10.1007/978-3-642-02225-8_47].
Dynamics of viscoelastic wall turbulence in different ranges of scales
DE ANGELIS, Elisabetta;CASCIOLA, Carlo Massimo;PIVA, Renzo
2010
Abstract
We address the dynamics of viscoelastic wall turbulence by means of a generalization of a scale-by-scale approach extended to both an inhomogeneous and viscoelastic case. Analysing the results obtained by a series of Direct Numerical Simulations of a dilute polymer solution in a plane channel, we focus our attention on the alteration of the inertial transfer across the scales and the polymer scale-dependent term in the budget for the second order velocity structure function. We confirm that both these observables lead to a scenario were the main alteration of turbulence structure in a channel flow occurs in the buffer layer.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
