natural air ventilation

- December 5, 2019 at 5:19 am
  
  atharva_columbia university
  Subscriber
  
  if there is a heat source in a room which heats up the air inside .There is ventilation provided as well .how to decide which boundary condition to keep . velocity or pressure boundary condition for ventilation ?? in case of louvers what to do ?
- December 5, 2019 at 1:36 pm
  
  peteroznewman
  Subscriber
  
  You would use a Pressure BC for the vent to the room. A little air will leave as the heat source warms the air and it expands or the air currents develop and momentum carries some air out the vent. The louvers are probably so open as to offer very little resistance to the air movement so could be ignored.
  
  What is your simulation goal?
- December 5, 2019 at 5:05 pm
  
  Rob
  Ansys Employee
  
  There's also a vent outlet condition: that can be used to add an extra pressure loss to a boundary. However, as Peter states, it's possibly not going to do much for a normal buoyancy driven flow.

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