Effect of parameters of traveling wave-like blowing and suction on skin-friction drag reduction and heat transfer enhancement in turbulent channel flow

Direct numerical simulations of turbulent channel flows controlled by the traveling wave-like blowing and suction are performed. We focus on simultaneous achievement of skin-friction drag reduction and heat transfer enhancement due to the control. The control performance is parametrically investigated. Three different thermal boundary condition are examined: constant temperature difference, heat flux, and heat generation conditions. The dissimilar control effects, i.e., the heat transfer enhancement and the drag reduction, are obtained when the wave travels in the upstream direction.