Purpose of Boundary Reference Frame
 

Hello All,

What is the use/Purpose of Boundary Reference Frame under Boundary in Regions?

I believe it becomes useful when you are doing a MRF (moving reference frame) analysis. Consider a propeller spinning in the air, you could set a reference frame to the rotating region and calculate various vector based fluid dynamic properties from this location (taking into account movement of the body) rather than against your static origin locked reference frame.

I have personally never used it... FYI. I could be 100% wrong on that.

Well, that's what I get for speaking off-the-cuff. A quick look at the help files shows this:

'Region Reference Frame: Uses the reference frame of the parent region. When the region has a rotating reference frame attached, a physically valid setup using this condition puts the boundary in the reference frame of the region. This implies that the boundary is rotating with the region at the same RPM, and has the same rotation axis and origin as the region.'

You can specify a reference frame specific to that boundary using the Local Reference Frame option.