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Vorticity dynamics in turbulence growth

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Abstract

The mechanisms of vorticity amplification in the formation of turbulence are investigated by means of direct numerical simulations of the Navier–Stokes equations with different initial conditions and Reynolds numbers. The simulations show good universality of the enstrophy evolution, that occurs in two stages. The first stage is dominated by the effect of vortex stretching, and it finishes with a k −3 power-law energy spectrum. The second stage is dominated by the action of viscosity on the small scales, and it finishes with a Kolmogorov k −5/3 energy spectrum.

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Authors and Affiliations

  1. Dipartimento di Meccanica e Aeronautica, Università di Roma “La Sapienza”, Via Eudossiana 18, 00184, Rome, Italy

    Paolo Orlandi & Sergio Pirozzoli

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  1. Paolo Orlandi
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  2. Sergio Pirozzoli
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Correspondence to Sergio Pirozzoli.

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Communicated by H. Aref

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Orlandi, P., Pirozzoli, S. Vorticity dynamics in turbulence growth. Theor. Comput. Fluid Dyn. 24, 247–251 (2010). https://doi.org/10.1007/s00162-009-0100-2

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  • DOI: https://doi.org/10.1007/s00162-009-0100-2

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