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1997 Surface Stretching for Ornstein Uhlenbeck Velocity Fields
Rene Carmona, Stanislav Grishin, Lin Xu, Stanislav Molchanov
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Electron. Commun. Probab. 2: 1-11 (1997). DOI: 10.1214/ECP.v2-980


The present note deals with large time properties of the Lagrangian trajectories of a turbulent flow in $R^2$ and $R^3$. We assume that the flow is driven by an incompressible time-dependent random velocity field with Gaussian statistics. We also assume that the field is homogeneous in space and stationary and Markovian in time. Such velocity fields can be viewed as (possibly infinite dimensional) Ornstein-Uhlenbeck processes. In d spatial dimensions we established the (strict) positivity of the sum of the largest $d-1$ Lyapunov exponents. As a consequences of this result, we prove the exponential stretching of surface areas (when $d=3$) and of curve lengths (when $d=2$.) This confirms conjectures found in the theory of turbulent flows.


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Rene Carmona. Stanislav Grishin. Lin Xu. Stanislav Molchanov. "Surface Stretching for Ornstein Uhlenbeck Velocity Fields." Electron. Commun. Probab. 2 1 - 11, 1997.


Accepted: 25 January 1997; Published: 1997
First available in Project Euclid: 26 January 2016

zbMATH: 0890.60047
MathSciNet: MR1448321
Digital Object Identifier: 10.1214/ECP.v2-980

Primary: 60H10
Secondary: 60H30

Keywords: Diffusion processes , Lyapunov exponent , Stochastic flows

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