Small-scale statistics of viscoelastic turbulence

  title={Small-scale statistics of viscoelastic turbulence},
  author={Stefano Berti and A. Bistagnino and Guido Boffetta and Antonio Celani and Stefano Musacchio},
The small-scale statistics of homogeneous isotropic turbulence of dilute polymer solutions is investigated by means of direct numerical simulations of a simplified viscoelastic fluid model. It is found that polymers only partially suppress the turbulent cascade below the Lumley scale, leaving a remnant energy flux even for large elasticity. As a consequence, fluid acceleration in viscoelastic flows is reduced with respect to Newtonian turbulence, whereas its rescaled probability density is left… 

Large is different: non-monotonic behaviour of elastic range scaling in polymeric turbulence at large Reynolds and Deborah numbers

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Dispersed Fibers Change the Classical Energy Budget of Turbulence via Nonlocal Transfer.

The backreaction of dispersed rigid fibers to turbulence is analyzed by means of a state-of-the-art fully coupled immersed boundary method and provides a link between two apparently separated realms: the one of porous media and theOne of suspension dynamics.

Scaling Relations in Elastic Turbulence.

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Energy dynamics in elastoinertial turbulence is investigated by performing different direct numerical simulations of stationary, homogeneous isotropic turbulence for the range of Weissenberg numbers

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This chapter is devoted to the dynamics of isotropic turbulence in dilute polymer solutions. Governing equations associated to the very popular FENE-P rheological model are exhaustively discussed.

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Creeping flow of polymeric fluid without inertia exhibits elastic instabilities and elastic turbulence accompanied by drag enhancement due to elastic stress produced by flow-stretched polymers.

Energy spectra in elasto-inertial turbulence

Direct numerical simulations of statistically steady homogeneous isotropic turbulence in viscoelastic fluids described by the FENE-P model are presented. Emphasis is given to large polymer relaxation

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Long-chain polymers usually possess a high degree of flexibility and, in their basic state, coil up to an approximately spherical shape. In a turbulent flow, the polymers become stretched and some of

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Abstract The effects of polymer additives on decaying isotropic turbulence are numerically investigated using a hybrid approach consisting of Brownian dynamics simulations for an enormous number of



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The work reported below is a comparative study of the properties of turbulence with weak mean flow in a Newtonian fluid and in a dilute polymer solution with an emphasis on the small scale phenomena.

Dynamics of Polymeric Liquids

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Multifractal statistics of Lagrangian velocity and acceleration in turbulence.

The 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 and are compared with predictions of the multifractal formalism.

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