Porous media: boundary condition on interface between porous media and fluid zone

- June 25, 2020 at 7:02 am
  
  Sofia16
  Subscriber
  
  Hello,
  
  In my model I am using a porous media zone. I would like to know what exactly are the conditions that Fluent imposes on the surface that there is between the fluid and the porous media. For that surface I selected "interior", like I saw in an Ansys Tutorial. I searched on the User's Guide but I didn't found what that implies physically (I mean like conditions imposed on pressures and velocities).
  
  Best regards,
  
  Sofia
- June 25, 2020 at 1:39 pm
  
  Rob
  Forum Moderator
  
  Interior means that there's a surface but it doesn't do anything. All zones must be bounded, on the outside of a domain this may be a wall or inlet; between two fluids it may be a wall (no flow) or interior (flow passes straight through).
- June 25, 2020 at 1:41 pm
  
  RK
  Ansys Employee
  
  Hello Sofia,
  
  Can you please elaborate more on your question?
- June 25, 2020 at 1:59 pm
  
  Sofia16
  Subscriber
  
  Thank you for your replies.
  
  What I would like to know is to know the mathematical condition between the two mediums.
  
  Is there only the addition of a term in the momentum equations for the porous medium and nothing else?
  
  Best regards,
  
  Sofia
- June 25, 2020 at 2:02 pm
  
  RK
  Ansys Employee
  
  Yes, there is a source term accounted for in the momentum equation, which creates an artificial velocity along the porous medium.
  
  Please refer to Section 7.2.3.2 : https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/flu_ug/flu_ug_sec_bc_porous_media.html?q=porous%20media