Response of spatially-developing turbulent boundary layer to spanwise oscillating electromagnetic force

Direct numerical simulations were performed to investigate the physics of a spatially-developing turbulent boundary layer flow subjected to spanwise oscillating electromagnetic force. The electromagnetic force beneath the flat plate was locally given with a finite length. A fully implicit fractional step method was employed to simulate the flow. The mean flow properties and the Reynolds stresses were obtained to analyze the nearwall turbulent structure. The skin friction and turbulent kinetic energy can be reduced by the electromagnetic forces. In the absence of the electromagnetic force, the flow eventually relaxes back to a two-dimensional equilibrium boundary layer.