粘弾性流体の壁面注入による乱流境界層流れの抵抗低減に関する数値解析

抄録

We performed direct numerical simulations (DNSs) of turbulent boundary layer flows with the wall injection of Newtonian and viscoelastic (FENE-P) fluids in order to distinguish the effects of drag reduction due to the high-speed wall injection and viscoelastic effect. The high-speed wall injection within the viscous sublayer parallel to the wall was simulated by imposing uniform velocities, which were 1, 2, and 3 times larger than the free stream velocity. We clarified the effect of wall injection of Newtonian and viscoelastic fluids via the investigation of streamwise variations in the drag reduction ratio and mean velocity profiles.