# Simulation numérique directe du contrôle d'écoulements turbulents par forçage électromagnétique

Abstract : This thesis deals with electromagnetic turbulent flow control and its promissing naval applications like flow separation prevention and drag reduction.

It is mostly an academic approach using Direct Numerical Simulations (D.N.S.) of turbulent channel flow

Electromagnetic actuators are made with Wall flushed'' electrodes and sub-surface'' magnets.

They can generate local volumic Lorentz forces within a sea-water turbulent boundary layer.

The originality of this study comes from the computation of electromagnetic forces taking account of the geometry of electrodes and magnets with an analytical method based on electric and magnetic fluxes conservation.

The present study is mainly focused on the parallel electromagnetic actuator whose magnets and electrodes are parallel to each other.

This actuator that generates a quasi-unidirectional force, is aligned in the spanwise or streamwise direction of a turbulent channel flow.

The objectives of this research is the diminution of the required power of an active control to reduce the drag.

Direct numerical simulations are performed in order to obtain a better understanding of the drag reduction mecanism caused by spanwise oscillating or streamwise propulsive electromagnetic forcing.
Keywords :
Document type :
Theses

https://tel.archives-ouvertes.fr/tel-00400838
Contributor : Stéphane Montesino <>
Submitted on : Wednesday, July 1, 2009 - 11:29:38 PM
Last modification on : Thursday, January 3, 2019 - 4:30:07 PM
Document(s) archivé(s) le : Tuesday, June 15, 2010 - 7:16:56 PM

### Identifiers

• HAL Id : tel-00400838, version 1

### Citation

Stéphane Montesino. Simulation numérique directe du contrôle d'écoulements turbulents par forçage électromagnétique. Dynamique des Fluides [physics.flu-dyn]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00400838⟩

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