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A stochastic model of torques in von Karman swirling flow

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Abstract.

A stochastic model is derived to predict the turbulent torque produced by a swirling flow. It is a simple Langevin process, with a colored noise. Using the unified colored noise approximation, we derive analytically the PDF of the fluctuations of injected power in two forcing regimes: constant angular velocity or constant applied torque. In the limit of small velocity fluctuations and vanishing inertia, we predict that the injected power fluctuates twice less in the case of constant torque than in the case of constant angular velocity forcing. The model is further tested against experimental data in a von Karman device filled with water. It is shown to allow for a parameter-free prediction of the PDF of power fluctuations in the case where the forcing is made at constant torque. A physical interpretation of our model is finally given, using a quasi-linear model of turbulence.

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Authors and Affiliations

  1. Groupe Instabilité et Turbulence, CEA/DSM/DRECAM/SPEC and CNRS URA 2464, 91191, Gif-sur-Yvette Cedex, France

    N. Leprovost, L. Marié & B. Dubrulle

Authors
  1. N. Leprovost
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  2. L. Marié
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  3. B. Dubrulle
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Corresponding author

Correspondence to N. Leprovost.

Additional information

Received: 29 January 2004, Published online: 18 June 2004

PACS:

47.27.-i Turbulent flows, convection, and heat transfer - 47.27.Eq Turbulence simulation and modeling

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Leprovost, N., Marié, L. & Dubrulle, B. A stochastic model of torques in von Karman swirling flow. Eur. Phys. J. B 39, 121–129 (2004). https://doi.org/10.1140/epjb/e2004-00177-x

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