Magnethydrodynamic turbulent flow in a channel at low magnetic Reynolds number (Q2743756)

The paper is concerned with the suppression of turbulence in liquid metal flows. The effects of Lorentz force on near-wall turbulence structures are investigated using direct numerical simulation technique, with the assumption of no induced magnetic field at low magnetic Reynolds number. A uniform magnetic field is applied in the streamwise, wall-normal or spanwise direction to turbulent flow in an infinitely long channel with non-conducting walls. Among other effects, the authors show that the wall-normal magnetic field is much more effective than the streamwise and spanwise magnetic fields in reducing turbulent fluctuations and suppressing the near-wall streamwise vorticity. It is also shown that in the cases of strong wall-normal and spanwise magnetic fields all turbulent intensities, Reynolds shear stress and vorticity fluctuations decrease rapidly and become zero.