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[Solved] Trouble with a Laminar Outflow Flow Rate and a pressure at the Inlet
Posted Aug 16, 2018, 5:56 AM EDT Fluid, Computational Fluid Dynamics (CFD) Version 5.3a 2 Replies
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I'm relatively new to COMSOL. Im trying to set a system with boundary conditions where I define my outflow flow rate and ave an ambient pressure at the inlet (Case 1).
I have tried it th other way around with Flow rate at inlet and pressure out outlet (Case 2) and it seems very defined but my system is specifically defined as a pulling of air (Case 1) through the system not pushing air (Case 2) through the system.
For the flow rate at outflow (Case 1), the problem seems to try to converge and then unconverge again. I would be happy with the Flow rate at Inlet (Case 2) but I have a complex geometry which has a internal tank with holes into the air flow channel. In the pulling of air (Case 1), I know that this tank will have a low pressure. And in the pushing the air (Case 2) it has higher pressure.
Is it possible to have the Case 1 converged with those boundary conditions or do a different set of boundary conditions have to be made like a pressure condition at the outlet where is is equal to the pressure drop across the device?
Any advice on this would be great.