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[jijojose2024]

How can i simulate  the air flowing into a vacuum tank where inside the tank presssure is close to vacuum and outside is ambient pressure

[Essence]

Hello,

You can patch the pressure value near to vacuum pressure, then apply all the other quantities like velocity, turbulence quantities near to zero. And then apply the inlet BC as per convenience. It can be mass flow inlet, velocity inlet or even the pressure inlet.