We study the impact of the Peterlin approximation on the statistics of the end-to-end separation of polymers in a turbulent flow. The finitely extensible nonlinear elastic (FENE) model and the FENE model with the Peterlin approximation (FENE-P) are numerically integrated along a large number of Lagrangian trajectories resulting from a direct...
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November 5, 2015 (v1)Journal articleUploaded on: March 26, 2023
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2005 (v1)Journal article
he statistical properties of fluid particles transported by a three-dimensional fully developed turbulent flow are investigated by means of high resolution direct numerical simulations. Single trajectory statistics are investigated in a time range spanning more than three decades, from less than a tenth of the Kolmogorov time scale, , up to one...
Uploaded on: December 3, 2022 -
2004 (v1)Conference paper
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Uploaded on: December 3, 2022 -
2006 (v1)Journal article
The statistics of Lagrangian particles transported by a three-dimensional fully developed turbulent flow is investigated by means of high-resolution direct numerical simulations. The analysis of single trajectories reveals the existence of strong trapping events vortices at the Kolmogorov scale which contaminates inertial range statistics up to...
Uploaded on: December 3, 2022 -
2002 (v1)Conference paper
Conference on Advances in Turbulence IX (ETC-9)}, Southampton, U.K., 2-5 Juillet 2002
Uploaded on: December 3, 2022 -
2003 (v1)Journal article
We present the results of a numerical investigation of three-dimensional decaying turbulence with statistically homogeneous and anisotropic initial conditions. We show that at large times, in the inertial range of scales: (i) isotropic velocity fluctuations decay self-similarly at an algebraic rate which can be obtained by dimensional...
Uploaded on: December 3, 2022 -
2004 (v1)Journal article
he statistical properties of velocity and acceleration fields along the trajectories of fluid particles transported by a fully developed turbulent flow are investigated by means of high resolution direct numerical simulations. We present results for Lagrangian velocity structure functions, the acceleration probability density function, and the...
Uploaded on: December 3, 2022 -
2005 (v1)Journal article
We present a detailed investigation of the particle pair separation process in homogeneous isotropic turbulence. We use data from direct numerical simulations up to Taylor\'s Reynolds number 280 following the evolution of about two million passive tracers advected by the flow over a time span of about three decades. We present data for both the...
Uploaded on: December 3, 2022 -
November 21, 2016 (v1)Journal article
By using direct numerical simulations at unprecedented resolution we study turbulence under rotation in presence of simultaneous direct andinverse cascades. The accumulation of energy at large scale leads to the formation of vertical coherent regions with high vorticity oriented along the rotation axis. By seeding the flow with millions of...
Uploaded on: February 28, 2023