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Inlet Behaving like waterfall,How to fix this ?

- March 4, 2026 at 9:04 pm
  
  mshreepal
  Subscriber
  
  I am trying to replicate half filled pipe. I have flow rate of 40 l/s.
  SImualtion type - Transient , VOF( Open channel) , Primary- AIr, Secondary - Water. For trial i am considering Laminar flow.
  I defined free surface and bottom in Inlet BC.
  Problem I am facing is my inlet is behaving like a waterfall. How to fix this ?
- March 5, 2026 at 9:38 am
  
  Rob
  Forum Moderator
  
  What's holding the water in at the other end?
- March 5, 2026 at 2:02 pm
  
  mshreepal
  Subscriber
  
  There is a pressure outlet on other side. It is a straight pipe.
- March 5, 2026 at 2:07 pm
  
  Rob
  Forum Moderator
  
  There's an open channel outlet too, if you set a uniform pressure there's nothing to hold the water up so it's just flowing out with next to no depth. If the inlet speed isn't sufficient to fill the domain you get what you're seeing.

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