hi thanks for your opinion,I am really helped by that information, but honestly i am still confusing how to simulate that,in my case there is no inlet and outlet, but its consist of 4 kinds different of fluids ( base oil and additives )in one tank, than shaking with rotating blade.how can i modeling this conditions to find the homogeneous mixing.would you give me some advice or exactly give me tutorial.

Hi,

That works fine, the flow motion is defined by internal processes rather than external boundary conditions.

Glenn Horrocks