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Intermittency in Turbulence: computing the scaling exponents in shell models

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arxiv nlin/0307008 v1 pith:SSBR6PTO submitted 2003-07-03 nlin.CD

Intermittency in Turbulence: computing the scaling exponents in shell models

classification nlin.CD
keywords modelsscalingshellequationexponentsfunctionsmotionturbulence
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We discuss a stochastic closure for the equation of motion satisfied by multi-scale correlation functions in the framework of shell models of turbulence. We give a systematic procedure to calculate the anomalous scaling exponents of structure functions by using the exact constraints imposed by the equation of motion. We present an explicit calculation for fifth order scaling exponent at varying the free parameter entering in the non-linear term of the model. The same method applied to the case of shell models for Kraichnan passive scalar provides a connection between the concept of zero-modes and time-dependent cascade processes.

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