[onlycfd]

Hello Everyone,

Following query has been quite troubling for me to get an answer. Probably the experts in here should be able to guide me on it.

Have a circular tube, with a porous body and a 3D Axial Fan, as shown in the attached figure.

3D Fan zone is a rotating domain with an rpm attached to it and the porous body has the inertial components attached in the definition of porous zone.

Now herein my grey cells give up.


Let's say

For a fixed rpm of 1000, and an inertial coefficient of 50, the flow from the tube is 200 m3/s

Now for the "same rpm", and an "increase" in inertial coefficent above 50, the flow from the tube "drops/decreases" to less than 200 m3/s


Was under the impression that it is the fan rpm that is controlling the flow through the tube.

Believe that when we provide "frame motion" to the rotating domain, its only the forces that gets transferred to the fluid. Shouldn't this also control the suction and hence the flow through the tube ?


Not sure what I am missing in the understanding of the physics in here.


Appreciate all your guidance and insights on the topic.