Learning Forum

[prathikshetty]

Hello

Can anyone tell me the difference between the Multiple Reference Frame (MRF) and the Sliding Mesh approach.

I want to know the physics behind the flux transfer at the interface, in both Multiple Reference Frame (MRF) and Sliding Mesh Approach, other words how exactly the information is transferred from a Moving frame to a stationary frame.

Thanks in advance

Prathik

 

[DrAmine]

sliding Mesh: Transient sliding /motion of mesh on both side of interface. No additional source terms area added into the momentum equations. This is always transient.

MFR: Mesh static. Due to accelerated frame of reference and to apply Newton's law we need to add some additional source terms into the momentum equations like centrifugal, Coriolis and Euler forces. MFR makes a sense if the flow seen from the rotating/moving frame of reference is steady along the interface. 

[prathikshetty]

Hi

Thanks for the answer!

So you mean to say that, in sliding mesh approach there no additional equations being solved and the mesh will be moving. But how are the fluxes passing from the rotating frame to the Stationary frame will be calculated. 

Thanks 

Prathik

[DrAmine]

No: no additional terms are introduced to the equations. We are still solving the conservation equations with a changed control volume but no "fictive" forces are added as in the case of MFR.