On the stability of the boundary layer subject to a wall-parallel Lorentz force

The stability of a transitional boundary layer influenced by a wall-parallel, streamwise oriented Lorentz force is investigated by means of direct numerical simulation. Damping of Tollmien-Schlichting waves is observed already at weak force amplitudes. For a particular amplitude, similar to homogene...

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Bibliographic Details
Published inPhysics of fluids (1994) Vol. 18; no. 9
Main Authors Albrecht, Thomas, Grundmann, Roger, Mutschke, Gerd, Gerbeth, Gunter
Format Journal Article
LanguageEnglish
Published Melville, NY American Institute of Physics 01.09.2006
Subjects
Exact sciences and technology
Flow control
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Physics
Turbulence control
Turbulent flows, convection, and heat transfer
Electromechanical control
Digital simulation
Control systems
Modelling
Transition flow
Lorentz force
Boundary layers
Turbulence structure
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ISSN1070-6631
1089-7666
DOI10.1063/1.2353401

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Summary:The stability of a transitional boundary layer influenced by a wall-parallel, streamwise oriented Lorentz force is investigated by means of direct numerical simulation. Damping of Tollmien-Schlichting waves is observed already at weak force amplitudes. For a particular amplitude, similar to homogeneous suction, the initial Blasius layer evolves towards an exponential velocity profile of strongly enhanced stability. Here, intermediate velocity profiles are found to have linear stability properties superior to that of the asymptotic exponential profile. Additional three-dimensional simulations support the two-dimensional results as Lorentz forcing clearly damps the coherent structures of the transitional flow.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.2353401