Abstract
We consider the non-homogeneous generalised Burgers equation
Here f is strongly convex and satisfies a growth condition, ν is small and positive, while η is a random forcing term, smooth in space and white in time. For any solution u of this equation we consider the quasi-stationary regime, corresponding to \({t \geq T_1}\), where T 1 depends only on f and on the distribution of η. We obtain sharp upper and lower bounds for Sobolev norms of u averaged in time and in ensemble. These results yield sharp upper and lower bounds for natural analogues of quantities characterising the hydrodynamical turbulence. All our bounds do not depend on the initial condition or on t for \({t \geq T_1}\), and hold uniformly in ν. Estimates similar to some of our results have been obtained by Aurell, Frisch, Lutsko and Vergassola on a physical level of rigour; we use an argument from their article.
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Boritchev, A. Sharp Estimates for Turbulence in White-Forced Generalised Burgers Equation. Geom. Funct. Anal. 23, 1730–1771 (2013). https://doi.org/10.1007/s00039-013-0245-4
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DOI: https://doi.org/10.1007/s00039-013-0245-4