During the past several decades, much effort has been made to control turbulent boundary layers in order to achieve drag reduction. These earlier attempts, however, have been less than satisfactory, and turbulence control remains as one of the most challenging problems in fluid dynamics. Recent advances in our understanding of turbulent boundary layers and new emerging technologies, such as micro-electro-mechanical systems (MEMS) and nonlinear adaptive controllers, have led to new approaches for turbulence control. New approaches have been explored and developed through numerical simulations. Numerical simulations in this sense provides a new laboratory in which one can explore and develop new concepts for flow control. A few examples of on-going numerical experiments for flow control will be presented with a particular emphasis on the electro-magnetic force control (EFC).