LAUSR

Abstract To investigate Magneto-Hydro-Dynamics (MHD) effects on structures of turbulence near a free surface, Direct Numerical Simulations (DNS) of free surface turbulent flows imposed on a wall-normal magnetic field were conducted under the friction Reynolds number 400 with the Hartmann number 0, 10, 14, and 16. As the results, we can succeed to obtain the all information to develop and validate the RANS model such as a k-epsilon model. Near free surface, the MHD dissipation term of the turbulent kinetic energy shows the dominant contribution, but one of the turbulent dissipation rate gives little influence for the transport process. Furthermore, the validity of the modeling of MHD effects on the free-surface proposed by Smolentsev et al., Int. J. Eng. Sci. (2002) was shown by means of the present DNS database.