Flow simulation of a mixer in a mortar tank

Hi all 

I want to perform a fluid simulation of the mixing process in order to get the engine torque needed to turn a mixer.  As shown in the photo, the mixer is inside the hopper. Having already defined the mortar mixtures as the fluid entering through the sieve of the mortar pan, I still can't perform the malaxation simulation since I have to define a cylindrical rotating region encompassing the mixer and not any shape. Is it possible to perform this simulation on solidworks flow simulation? 

Thank you in advance for your answer.


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