Friction drag reduction effect of uniform blowing or suction on a turbulent boundary layer with pressure gradient

Abstract

Influences of pressure gradient on the friction drag reduction effect of uniform blowing or suction in a turbulent boundary layer is investigated by means of Reynolds-Averaged Navier-Stokes simulation. In the present study, to create an adverse-to-favorable pressure gradient, a suction-blowing velocity distribution is prescribed along the upper boundary. As a result, drag reduction effect of uniform blowing is increased by adverse pressure gradient and suppressed by favorable pressure gradient. On the other hand, it is also found that pressure gradient has a little influence on the overwall change in skin friction.