Thank you all in the community for supporting so well. And there is one more question to ask. This one is regarding the flow analysis over a fan blade. Now I have a three blade configuration and I would like to see what happens when the fan rotates inside a room. From previous search I have found out that all the components in the flow analysis has to be fixed and I also saw about 'rotating reference frames' and creating dummy bodies over the components that actually rotate, inside the whole working domain. Now the important part is "how do I draw a dummy domain/surface/or whatever it is called, over the fan blade to see the flow over it and the flow inside the room?