Direct Numerical Simulation Of Drag Reduction Of Underwater Aircraft And Drag Reduction Mechanism Analysis

Turbulent drag exists in the flow transport, aviation and navigation fields and isthe most energy consumation.In this paper, a theoretical investigation of the drag reduction for underwater submarine by riblet biomimetic non-smooth surface and microbubble carried out,the prime mechanism of two drag reduction technology is open out , and provide theoretical foundation for engineering,which proved efficiency of thruster.The drag reduction of riblet biomimetic non-smooth surface is given out by numerical simulation with cfx . Through analysis of velocity vector field and velocity fluctuation this article probe into drag reduction mechanism of unsmooth surface.Through analysis of behavior of single microbubble and turbulent kinetic energy this article indicate drag reduction mechanism of microbuble. Viscosity dissipation is suggested.