Modeling the interface in two overlapping fluid zones

- June 22, 2020 at 6:31 pm
  
  zeeshe
  Subscriber
  
  Dear Sir
  
  I have a fluid zone 'which is actually a porous zone' inside the other fluid zone. Of course, the porous zone transmit the its thermal and velocity effects i.e. heat and momentum transfer to the other fluid zone but no mass transfer,.
  
  I have the conformal mesh on the overlapping faces of the two zones.
  
  Do I have to create interfaces among the overlapping surfaces of the two zones?
  
  If yes, then the interface type would be a coupled wall or interior?
  
  looking forward for a detailed reply as it has not been mentioned in fluent user guide.
- June 22, 2020 at 8:35 pm
  
  Karthik Remella
  Administrator
  
  Hello,
  
  Are you using the Equilibrium or Non-Equilibrium Thermal Model?
  
  Thanks.
  
  Karthik
- July 1, 2020 at 2:23 am
  
  zeeshe
  Subscriber
  
  Dear kremela
  I am using non-equilibrium thermal model. Should I use the equilibrium model ? Any pros& cons
- July 1, 2020 at 2:26 am
  
  zeeshe
  Subscriber
  
  Dear kremella
  Dear kremela I am using non-equilibrium thermal model. Should I use the equilibrium model ? Any pros& cons.
  As I have to create interfaces among the overlapping surfaces of the two zones?
  
  If yes, then the interface type would be a coupled wall or interior
- July 2, 2020 at 12:14 pm
  
  Karthik Remella
  Administrator
  
  The non-equilibrium model will ensure that the fluid and solid regions of your porous media are not at the same temperature. You will be required to provide an effective heat transfer coefficient to model the energy exchange between them. In this case, you will have coinciding overlapping fluid and solid cell zones of your porous media The equilibrium model, on the other hand, will ensure that the solid and fluid regions of your porous media are at the same temperature. In the equilibrium case, you will have just one single cell zone. The selection depends on the physics you are attempting to model. Please see the Users guide for the detailed differences between them.
  
  The surface shared between two solid cell-zones or a solid and the adjacent fluid cell zone must be a coupled wall.
  
  The surface which is shared between two adjacent fluid zones must be interior.
  
  The equilibrium model is somewhat simpler as there is only one cell zone you need to worry about. Please try to maintain what I just said earlier and see if this helps.
  
  Thank you.
  
  Best,
  
  Karthik