Problem in mesh motion or mrf
 

I created a model , I use sphere to cover propeller and boolean it

and then,I use enclosure to build a cylinder .


ball is rotational (105.85rpm)

inlet 5m/s(compute from inlet)

the problem is that when the ball is rotating and around the ball have some lucana

why should I do?

it confuse me a few month

plz!! help me http://ppt.cc/gGWFnhttp://ppt.cc/BUm6o@.jpg
http://ppt.cc/BUm6ohttp://ppt.cc/4p9ly@.jpg