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vacuum pump: differenct BCs
Posted 15 août 2017, 17:31 UTC−4 Fluid & Heat, Computational Fluid Dynamics (CFD) Version 5.2a 1 Reply
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Hello there!
When building a CFD-model, the following BC seem to work best (according to my tests and research):
Inlet: velocity Outlet: rel. pressure
My problem: I`d like to simulate a stationary air flow caused by a vacuum pump. With a given max. vacuum (Pa) and max. flow rate (m³/s) of the vacuum pump, the max. average velocity at the inlet/outlet is also given. Both of the following BCs result in a convergent, yet different, solution:
1) Inlet: max. given velocity ; outlet: p = 0 Pa
2) Inlet: max. given velocity ; outlet: p = - max. vacuum (Pa)
Am I correct by saying: 2) is the right way to go for a vacuum pump problem?
Thanks in advance!
When building a CFD-model, the following BC seem to work best (according to my tests and research):
Inlet: velocity Outlet: rel. pressure
My problem: I`d like to simulate a stationary air flow caused by a vacuum pump. With a given max. vacuum (Pa) and max. flow rate (m³/s) of the vacuum pump, the max. average velocity at the inlet/outlet is also given. Both of the following BCs result in a convergent, yet different, solution:
1) Inlet: max. given velocity ; outlet: p = 0 Pa
2) Inlet: max. given velocity ; outlet: p = - max. vacuum (Pa)
Am I correct by saying: 2) is the right way to go for a vacuum pump problem?
Thanks in advance!
1 Reply Last Post 21 août 2017, 05:09 UTC−4
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Posted:
7 years ago
Hi,
In case 1) as I have been informed by COMSOL representative, if you set up 0 it means that it gives you the pressure that you had in Initial values, so until it isn't the right pumping pressure for vacuum pump you have to type the other value.
In case 1) as I have been informed by COMSOL representative, if you set up 0 it means that it gives you the pressure that you had in Initial values, so until it isn't the right pumping pressure for vacuum pump you have to type the other value.