Transportation and coherent structures in MHD turbulent channel flow subject to uniform streamwise and spanwise magnetic fields

Abstract

We study the effect of both uniform spanwise and streamwise magnetic fields on the near wall region of a turbulent channel flow. Previous results have shown that the spanwise magnetic field leads to flow relaminarization for magnetic intensity significantly smaller than the streamwise magnetic field. In order to explain these results, a deep analysis of the fine turbulence structure is needed. We perform a detailed analysis through the Reynolds shear-stress transport equations and the conditional averaging deduced from the near wall active eddies, thus connecting the magnetic field orientation effect to the coherent electric current topology.