Fig. 6. Profiles of the dimensionless U_x velocity component for the flow approaching (left profiles) and moving away from (right profiles) a flagellum (circle) plotted along the x/d_f axis at y/d_f=10 (passing through the front and back stagnation points of the flagellum). Results are given for four dimensionless times (t^*=1 to t^*=4) for a subregion of the entire 20d_fx20d_f calculation domain, and at t^*=4 the flagellum Reynolds number is Re_f=50. At each time, the U_x velocity component approaching the flagellum drops from the free stream value U_o(t) for that time to the stagnation point value of 0 within less than two flagellum diameters. The region of reversed (negative) flow in the wake of the flagellum grows asymptotically with time (see Fig. 5 also). The black bars denote the lengths, to scale, of 0.25xd_f mechanoreceptor (MR) sensilla oriented normal to the flagellum surface.