The turbulent entrainment through the interface between a laminar and a turbulent region of a flow is one of the most ubiquitous phenomena in nature and technology where most flows are characterized by the compresence of rotational turbulent areas and laminar irrotational ones. Recently this phenomenon have been studied in the a controlled laboratory experiment where the diffusion of turbulence produced by an oscillating grid has been investigated. The resulting flow is quite instructive since the observed behaviour in this this flow without mean shear is believed to come from the interplay of the dynamics of both the large and the small scales of turbulence.
DNS of entrainment through turbulent/non-turbulent interface in dilute polymer solutions
DE ANGELIS, ELISABETTA;
2009
Abstract
The turbulent entrainment through the interface between a laminar and a turbulent region of a flow is one of the most ubiquitous phenomena in nature and technology where most flows are characterized by the compresence of rotational turbulent areas and laminar irrotational ones. Recently this phenomenon have been studied in the a controlled laboratory experiment where the diffusion of turbulence produced by an oscillating grid has been investigated. The resulting flow is quite instructive since the observed behaviour in this this flow without mean shear is believed to come from the interplay of the dynamics of both the large and the small scales of turbulence.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
