We address the dynamics of viscoelastic wall turbulence by means of a generalization of a scale-by-scale approach extended to a 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 where 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 E.; Casciola C.M.; Piva R.. - STAMPA. - 131:(2009), pp. 195-198. (Intervento presentato al convegno iTi 2008 tenutosi a Bertinoro nel Settembre 2008) [10.1007/978-3-642-02225-8_47].
Dynamics of viscoelastic wall turbulence in different ranges of scales
DE ANGELIS, ELISABETTA;
2009
Abstract
We address the dynamics of viscoelastic wall turbulence by means of a generalization of a scale-by-scale approach extended to a 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 where 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.
