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Old   February 9, 2011, 18:53
Default Reference Pressure Information
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Ugly Kid Joe
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I am trying to simulate a flow over cylinder in CFX. In default domain I mention the Reference Pr. to be 1 [atm] and Relative Pressure to be 0 [Pa] in global initialization. Inspite of this I get the following message in the .OUT file.


+--------------------------------------------------------------------+
| Reference Pressure Information |
+--------------------------------------------------------------------+

Domain Group: Default Domain

Pressure has not been set at any boundary conditions.
The pressure will be set to 0.00000E+00 at the following location:
Domain : Default Domain
Node : 1 (equation 1)
Coordinates : ( 0.00000E+00, 1.95356E+00, 0.00000E+00).

My domain is a simple rectangular region with a cylinder at the center.
My BC are as follows:

Inlet: Velocity u=0.5 m/s, v=0 & w=0
Outlet: Velocity u=0.5 m/s, v=0 & w=0
The rest of the side is Symmetric BC.

Any kind of help is greatly appreciated.
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Old   February 9, 2011, 19:23
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Glenn Horrocks
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You should make the exit a pressure outlet, set to 0Pa. Your current boundaries are not well defined - you have not set the pressure level (but you knew that from the error message!)
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Old   February 9, 2011, 19:29
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Even if I give constant velocity outlet, my Solution runs and also converges properly............... I really did not pay much attention to this error. However wats the problem if I give the outlet as constant mass flow rate or constant velocity ???

Thanks
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