Continuous representation for shell models of turbulence. (22nd June 2015)

• Record Type: Journal Article
• Authors: Mailybaev, Alexei A
• Is Part Of: Nonlinearity. Volume 28:Number 7(2015:Jul.)
• Page Start: 2497
• Page End: 2514
• Publication Date: 2015-06-22
• Subjects: shell model -- hydrodynamic model -- shock -- blowup -- turbulence; 76F20 -- 35Q35; Nonlinear theories -- Periodicals; Mathematical analysis -- Periodicals; Mathematical analysis; Nonlinear theories; Periodicals; 515
• DOI: 10.1088/0951-7715/28/7/2497
• Languages: English
• ISSNs: 0951-7715

Abstract

Abstract: In this work we construct and analyze continuous hydrodynamic models in one space dimension, which are induced by shell models of turbulence. After Fourier transformation, such continuous models split into an infinite number of uncoupled subsystems, which are all identical to the same shell model. The two shell models, which allow such a construction, are considered: the dyadic (Desnyansky–Novikov) model with the intershell ratio λ = 2 3/2 and the Sabra model of turbulence with . The continuous models allow for understanding of various properties of shell model solutions and provide their interpretation in physical space. We show that the asymptotic solutions of the dyadic model with Kolmogorov scaling correspond to the shocks (discontinuities) for the induced continuous solutions in physical space, and the finite-time blowup together with its viscous regularization follow the scenario similar to the Burgers equation. For the Sabra model, we provide the physical space representation for blowup solutions and intermittent turbulent dynamics.