SRF Theory
 

I'm trying to wrap my head around understanding how the software implements the SRF for rotation. From reading the manual my interpretation is as follows: when an SRF region is created, the equations defining fluid motion are transformed and solved for the rotating frame within this region. So the mesh itself remains "stationary" in the computational domain, however when a fluid particle crosses the interface into the SRF, its behavior is now governed by a different set of equations describing rotational motion, and so it assumes a new velocity.

Is this correct? My confusion is this: how does the rotating frame account for blade geometry of say, a pump or impeller? For example, you define a SRF, and the velocities are transformed as described here:

http://www.afs.enea.it/project/neptu...tate-equations

But when you define a rotating frame, is the blade geometry enclosed within this region actually "spinning" with the rotating frame or is it stationary? How does the software calculate how the fluid interacts with these wall boundaries within the rotating frame such that you would see differences in terms of changing design variables such as number of blades, angle of twist, etc.?

Could I think of it in this way: in the normal, physical world the blades move themselves and interact with the air around them. If I am standing inside the SRF in a CFD simulation, the air has been given "motion" and is interacting with the blades (which are not actually moving in the simulation)???