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Hiromichi Kobayashi,Hiroki Shionoya,Yoshihiro Okuno 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
Large-eddy simulation (LES) of the turbulent duct flows in the liquid metal magnethydrodynamic (MHD) power generatror is examined to reveal the behavior of the MHDI flows and the turbulent structures. The non-uniform magnetic flux density in the streamwise direction produces two eddy currents. The eddy current causes the wall-jet flows with M-shaped mean streamwise velocity profiles in the direction parallel to the external magnetic field. In contrast, the Hartmann flows with the flattened velocity profiles by the Lorentz force are produced in the direction perpendicular to the external magnetic field. In the case of the strong magnetic flux density, the turbulence structure similar to the Karman vortex sheets emerge in the downstream duct. The coherent structure model, one of the subgrid-scale models, well represents the relaminarization by the Lorentz force in comparison with the Smagorinsky model with the Van Driests wall function.