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What does outlet pressure boundary condition actually means?

Posted 1 juin 2016, 06:48 UTC−4 Computational Fluid Dynamics (CFD), Structural Mechanics 0 Replies

Sankarshan Verma
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What it seems to me is that when I set an outlet pressure boundary condition as 1 atm then it means that the pressure just outside my domain is 1 atm. Consider, for example, a deflating balloon. While in full size (inflated), it has some pressure inside it, say 1.2 atm (outlet blocked) . So when I want it to deflate, I set my outlet pressure condition as 1 atm. In reality, this balloon, now, should deflate slowly until the pressure inside the balloon becomes equal to 1 atm. But, in COMSOL, the balloon deflates in no time, in a sense that the pressure of the whole air domain becomes 1 atm in no time. No matter, how much I inflate the balloon, whole of the air comes out within a fraction of second making the pressure of domain 1 atm.

So here I would like to clarify the following
-If I am using the right boundary condition?
-If not, then what is the right boundary condition?

I am using Fluid Structure Interaction Module for my simulation.

Regards
Sankarshan Verma
0 Replies Last Post 1 juin 2016, 06:48 UTC−4
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