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Why gas pressure keep constant when being heated

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Old   July 9, 2008, 04:28
Default Why gas pressure keep constant when being heated
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Hao
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I doing a simulation in a 2D rectangular domain. I set all the four boudaries "Wall". The volume is full of air. And I heat it up at one wall (bottom). I use "ideal gas law" here. One thing i just cannot understand: the pressure unchange. The CFD code i used is CFD-ACE. Has anyone happen to meet this kind of problem?
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