Reverse flow on static condition
 

hi everyone,

i m modeling a flow around the miniature propeller at low Reynolds number. I tried many turbulence model and found k-e with standard wall function is better than others. y+<150. i want to model the flow at different free stream velocities as 0m/sec,2m/sec,4m/sec.....20m/sec. i got the right flow direction for the velocities 2,4,6m/sec but with the static condition i.e. at 0m/sec i am getting the reverse flow in downstream, which is not acceptable.

so please tell me what should i do?