57 citations · 478 across the 33 of their papers we have counts for
21 papers · 1 filter
Polymers in turbulence: stretching statistics and the role of extreme strain-rate fluctuations
Jason R. Picardo, Emmanuel L. C. VI M. Plan, Dario Vincenzi
Polymers in a turbulent flow are stretched out by the fluctuating velocity gradient; the stationary probability distribution function (p.d.f.) of extensions has a power-law tai…
Spirographic motion in a vortex
Sumithra Reddy Yerasi, Rama Govindarajan, Dario Vincenzi
Studies of particle motion in vortical flows have mainly focused on point-like particles, either inertial or self-propelled. This approximation assumes that the velocity field that…
How to extract a spectrum from hydrodynamic equations
John D. Gibbon, Dario Vincenzi
Practical results gained from statistical theories of turbulence usually appear in the form of an inertial range energy spectrum and a cut-off wave-numb…
Effect of internal friction on the coil-stretch transition in turbulent flows
Dario Vincenzi
A polymer in a turbulent flow undergoes the coil-stretch transition when the Weissenberg number, i.e. the product of the Lyapunov exponent of the flow and the relaxation time of th…
Polymer scission in turbulent flows
Dario Vincenzi, Takeshi Watanabe, Samriddhi Sankar Ray +1
Polymers in a turbulent flow are subject to intense strain, which can cause their scission and thereby limit the experimental study and application of phenomena such as turbulent d…
Dynamics of a long chain in turbulent flows: Impact of vortices
Jason R. Picardo, Rahul Singh, Samriddhi Sankar Ray +1
We show and explain how a long bead-spring chain, immersed in a homogeneous, isotropic turbulent flow, preferentially samples vortical flow structures. We begin with an elastic, ex…
Elasto-inertial Chains in a Two-dimensional Turbulent Flow
Rahul Singh, Mohit Gupta, Jason R. Picardo +2
The interplay of inertia and elasticity is shown to have a significant impact on the transport of filamentary objects, modelled by bead-spring chains, in a two-dimensional turbulen…
Effect of polymer-stress diffusion in the numerical simulation of elastic turbulence
Anupam Gupta, Dario Vincenzi
Elastic turbulence is a chaotic regime that emerges in polymer solutions at low Reynolds numbers. A common way to ensure stability in numerical simulations of polymer solutions is…
Kazantsev dynamo in turbulent compressible flows
Marco Martins Afonso, Dhrubaditya Mitra, Dario Vincenzi
We consider the kinematic fluctuation dynamo problem in a flow that is random, white-in-time, with both solenoidal and potential components. This model is a generalization of the w…
Preferential Sampling of Elastic Chains in Turbulent Flows
Jason R. Picardo, Dario Vincenzi, Nairita Pal +1
A string of tracers, interacting elastically, in a turbulent flow is shown to have a dramatically different behaviour when compared to the non-interacting case. In particular, such…
Droplets in isotropic turbulence: deformation and breakup statistics
Samriddhi Sankar Ray, Dario Vincenzi
The statistics of the deformation and breakup of neutrally buoyant sub-Kolmogorov ellipsoidal drops is investigated via Lagrangian simulations of homogeneous isotropic turbulence.…
Emergence of chaos in a viscous solution of rods
Emmanuel L. C. VI M. Plan, Stefano Musacchio, Dario Vincenzi
It is shown that the addition of small amounts of microscopic rods in a viscous fluid at low Reynolds number causes a significant increase of the flow resistance. Numerical simulat…
Lyapunov dimension of elastic turbulence
Emmanuel Lance Christopher VI Medillo Plan, Anupam Gupta, Dario Vincenzi +1
Low-Reynolds-number polymer solutions exhibit a chaotic behaviour known as 'elastic turbulence' when the Weissenberg number exceeds a critical value. The two-dimensional Oldroyd-B…
Tumbling of a Brownian particle in an extensional flow
Emmanuel Lance Christopher VI Medillo Plan, Dario Vincenzi
The phenomenon of tumbling of microscopic objects is commonly associated with shear flows. We address the question of whether tumbling can also occur in stretching-dominated flows.…
Elastic turbulence in a shell model of polymer solution
Samriddhi Sankar Ray, Dario Vincenzi
We show that, at low inertia and large elasticity, shell models of viscoelastic fluids develop a chaotic behaviour with properties similar to those of elastic turbulence. The low d…
On the Peterlin approximation for turbulent flows of polymer solutions
Dario Vincenzi, Prasad Perlekar, Luca Biferale +1
We study the impact of the Peterlin approximation on the statistics of the end-to-end separation of poly- mers in a turbulent flow. The FENE and FENE-P models are numerically integ…
Weak-strong clustering transition in renewing compressible flows
Ajinkya Dhanagare, Stefano Musacchio, Dario Vincenzi
We investigate the statistical properties of Lagrangian tracers transported by a time-correlated compressible renewing flow. We show that the preferential sampling of the phase spa…
Bending dynamics of semi-flexible macromolecules in isotropic turbulence
Aamir Ali, Samriddhi Sankar Ray, Dario Vincenzi
We study the Lagrangian dynamics of semi-flexible macromolecules in laminar as well as in homogeneous and isotropic turbulent flows by means of analytically solvable stochastic mod…
Elliptical Tracers in Two-dimensional, Homogeneous, Isotropic Fluid Turbulence: the Statistics of Alignment, Rotation, and Nematic Order
Anupam Gupta, Dario Vincenzi, Rahul Pandit
We study the statistical properties of orientation and rotation dynamics of elliptical tracer particles in two-dimensional, homogeneous and isotropic turbulence by direct numerical…
Experimental measurement of acceleration correlations and pressure structure functions in high Reynolds number turbulence
Haitao Xu, Nicholas T. Ouellette, Dario Vincenzi +1
We present measurements of fluid particle accelerations in turbulent water flows between counter-rotating disks using three-dimensional Lagrangian particle tracking. By simultaneou…
The Kraichnan-Kazantsev dynamo
D. Vincenzi
The problem of the dynamo effect for a Kraichnan incompressible helicity-free velocity field is considered. Exploiting a quantum formalism first introduced by Kazantsev (A.P. Kazan…