Taylor-Couette (TC) flow is one of the most popular flow fields for studying transitional flows and turbulence structures. The TC flow using liquid metal in the axial magnetic field has been investigated for controlling the rotational torque of wind turbines and for recovering electrical energy from surplus wind power [1]. Liquid metal is filled between the inner and outer cylinders where the outer one is at rest. The rotating inner cylinder is assumed to be connected to the shaft of the wind turbine. The Lorentz force acting against the azimuthal flow decelerates the rotation of the inner cylinder and controls the rotational torque of the wind turbine. Large-eddy simulation (LES) [2] is conducted to understand magnetohydrodynamic (MHD) phenomena in turbulent TC flow. Vortex structures are stretched in the azimuthal direction without a magnetic field. When the Hartmann number (Ha) proportional to magnetic flux density is set to 100, turbulence is laminarized and the vortex structures align in the axial direction. Streaks near the inner wall aligned in the azimuthal direction change to triplet high-speed streaks at Ha=100. Complex turbulence structures and vortex transports along the Taylor vortices will be presented in detail. REFERENCES [1] T. Hasebe, R. Sasaki, T. Fujino, H. Takana, H. Kobayashi, Experimental and theoretical analyses on power generation characteristics of co-axial MHD energy conversion device, Electrical Engineering in Japa, 216(3):e23446, 2023. [2] H. Kobayashi, Large eddy simulation of magnetohydrodynamic turbulent duct flows, Physics of Fluids, 20(1):015102, 2008.