The buoyancy-driven magnetoconvection in the crosssection of an infinitely long vertical square duct is investigatednumerically using the CFX code package. Theimplementation of a magnetohydrodynamic (MHD) problemin CFX is discussed, with particular reference to theLorentz forces and the electric potential boundary conditionsfor arbitrary electrical conductivity of the walls.The method proposed is general and applies to arbitrarygeometries with an arbitrary orientation of the magneticfield. Results for fully developed flow under various thermalboundary conditions are compared with asymptoticanalytical solutions. The comparison shows that the asymptoticanalysis is confirmed for highly conducting wallsas high velocity jets occur at the side walls. For weaklyconducting walls, the side layers become more conductingthan the side walls, and strong electric currents flowwithin these layers parallel to the magnetic field. As aconsequence, the velocity jets are suppressed, and the coresolution is only corrected by the viscous forces near thewall. The implementation of MHD in CFX is achieved.
|Numero di pagine||10|
|Stato di pubblicazione||Published - 2000|