# suitable outlet boundary condition

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 July 10, 2013, 01:42 suitable outlet boundary condition #1 Senior Member   Govindaraju Join Date: Apr 2010 Posts: 207 Rep Power: 10 Dear all In a pipe flow (many obstructions exist inside the pipe), If I don't know the outlet pressure, velocity etc what is the suitable boundary condition. I know the inlet velocity and pressure at t=0 s Kindly give your suggestions Thank you Regards Govind

 July 10, 2013, 02:54 #2 Senior Member     hamed Join Date: Apr 2009 Posts: 148 Rep Power: 10 there is now way to model a problem without knowing the outlet BC!.you can simplify the model to a known situation like free discharge flow or you can use a mas flow outlet BC.if you know the inlet velocity then you know the mass flow inlet that is equal to the mass flow outlet in most problems.

July 10, 2013, 04:24
#3
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Govindaraju
Join Date: Apr 2010
Posts: 207
Rep Power: 10
Quote:
 Originally Posted by hmasenger there is now way to model a problem without knowing the outlet BC!.you can simplify the model to a known situation like free discharge flow or you can use a mas flow outlet BC.if you know the inlet velocity then you know the mass flow inlet that is equal to the mass flow outlet in most problems.

I have one more question. Is outflow boundary condition equal to mass flow rate boundary condition?

Thank you

Regards

Govind

 July 10, 2013, 09:35 #4 Senior Member     hamed Join Date: Apr 2009 Posts: 148 Rep Power: 10 yes but pay attention to flow dimensions. mass flow rate Is in kg/sec not m3/hr or other volume flow dimensions.

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