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moca September 16, 2010 10:21

Positive Pressure ang negative Pressure
Hi, dear all

I have modelled external flow around building and I found that there are positive pressure and negative pressure. What's the meaning of the negative pressure and possitive pressure? Is it according with x, y, z direction? or positive pressure for compress and negative pressure for suction, is it right?

Thank's before....

ghorrocks September 16, 2010 18:08

Pressures are measured relative to a reference pressure, 1 atmosphere by default.

moca September 18, 2010 02:34

Dear Glenn,

Would you like give more explanation about this?

Thank you

ghorrocks September 18, 2010 06:00

It is a pretty basic concept and well described in the documentation. Read about reference pressure in CFX help.

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