Inlet boundary condition without meshing area

- May 3, 2022 at 11:50 am
  
  isaps1860
  Subscriber
  
  I have a long slot with small distances. So if I mesh this slot as a inlet boundary condition I get a very high number of elements. Is it possible to set this condition for example as a line inlet boundary condition or something like that? So that I can reduce the number of elements?
  Best regards
- May 3, 2022 at 12:40 pm
  
  Nikhil Narale
  Ansys Employee
  
  Hello,
  
  For 3d case, you have to assign boundary conditions to the 2d faces. Having said that, you have to mesh the face and assign boundary condition to it.
  However, you can play with the mesh and different sizing options if you want to reduce the number of elements.
  
  Nikhil
- May 3, 2022 at 1:06 pm
  
  Rob
  Forum Moderator
  
  Please post an image. There are a few tricks, but it's difficult to explain without breaking the rules (export law) and knowing more.
- May 3, 2022 at 1:26 pm
  
  isaps1860
  Subscriber
  
  I have a vehicle with a length of circa 11m and a slot for ventilation with only 1,2cm width (see image below). The slot itself has a length of circa 10 meter
- May 3, 2022 at 2:30 pm
  
  Rob
  Forum Moderator
  
  If it had been several slots we can cheat. Looking at the above it's not so easy as it could significantly influence the airflow downstream. What flow boundary are you needing to put on the surface?
- May 3, 2022 at 2:39 pm
  
  isaps1860
  Subscriber
  
  There┬┤s a second slot on the other side of the vehicle, which is also as long as the one above on the image.
  I already thought that this will be not easy to solve...The surface should be a velocity inlet with a profile of measured velocities along the slot.
- May 3, 2022 at 3:59 pm
  
  Rob
  Forum Moderator
  
  Which may have a significant effect on the flow in that area: read up on boundary layer separation.
- May 4, 2022 at 6:43 am
  
  isaps1860
  Subscriber
  
  Alright, thank you

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