抄録
It is known that turbulent drag is reduced at algae planted wall. We think that algae interact with turbulent flow in specific wave number domain. The drag reduction effect by means of Direct Numerical Simulation (DNS) with simplified model for algae in fully developed turbulence flow field, we increase the resistance force of transverse direction near the wall in specific wave number domain. Our results suggest that the spanwise damping in lower wave-number domain is more effective for drag reduction, but also that the operation at very restricted scale is not satisfactory.