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Patterned turbulence and relaminarization in MHD pipe and duct flows

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We present results of numerical analysis of relaminarization processes in MHD ducts and pipes flows at moderate values of the Reynolds and Hartmann numbers. The analysis also pursues a historical purpose of reproducing Julius Hartmann’s experiments on flows of mercury in pipes and ducts under the influence of magnetic fields. The computed critical parameters for the laminar-turbulent transition as well as the friction coefficients are in excellent agreement with Hartmann’s data. The simulations provide a first detailed view of flow structures that are experimentally inaccessible. Novel flow regimes with localized turbulent spots near the side walls parallel to the magnetic field are discovered.

Author(s):

Dmitry Krasnov    
TU Ilmenau
Germany

Oleg Zikanov    
University of Michigan-Dearborn
United States

Thomas Boeck    
TU Ilmenau
Germany