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Old   September 16, 2010, 10:21
Default Positive Pressure ang negative Pressure
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tato
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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....
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Old   September 16, 2010, 18:08
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Glenn Horrocks
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Pressures are measured relative to a reference pressure, 1 atmosphere by default.
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Old   September 18, 2010, 02:34
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Dear Glenn,

Would you like give more explanation about this?

Thank you
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Old   September 18, 2010, 06:00
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It is a pretty basic concept and well described in the documentation. Read about reference pressure in CFX help.
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