How to show a force generate by a propeller with flow simulation

Hello guys , i'm trying to calculate , with flow simulation , a force generated by the rotation of my propeller . I don't know why but when i try to show the flow trajectories , those trajectories seems to be good , but i can't obtain any force or any difference of presure/velocity. If someone could help me to fix this , that would be very kind.

Some screenshots of my flowsimulation parameters :
(All those screenshots will be in french , sorry about that)

https://gyazo.com/aed6e0f5db7423f43a3aa6e8483cbe82
https://gyazo.com/ce056eb70d8a8faba5a75b8cc11a58e2
https://gyazo.com/f98ad07de5b9492b4154125f5d415e9e
https://gyazo.com/b2025b224ea6fb1d388b34a897940dbb
https://gyazo.com/8a007aae3042612d3ac4e52807a16373

My results :
https://gyazo.com/4725dccb544fe278dac11c2a3e323eeb
https://gyazo.com/72dec62313265d7addd8fcf745c61800
https://gyazo.com/95b50008175d74231dcf2f8ba9fbbc0c