CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   STAR-CCM+ (http://www.cfd-online.com/Forums/star-ccm/)
-   -   Simulating a Vacuum Pump (http://www.cfd-online.com/Forums/star-ccm/91469-simulating-vacuum-pump.html)

malfonso1286 August 11, 2011 18:06

Simulating a Vacuum Pump
 
I would like to simulate the flow in a chamber that is being pumped on by a scroll pump. The pressure inside the chamber is supposed to stay a constant 0.3 atm, the gas that is sucked out by the pump is being replace through inlets. Currently I am using stagnation inlets set to -0.7 atm and a pressure outlet set to -0.9999 atm (reference pressure 1 atm). Is this the most correct way to do this simulation?

ping August 15, 2011 01:04

several suggestions:
- since the pressures everywhere are going to be around .3atm absolute, set the reference pressure to that value - will aid convergence
- then outlet will be 0atm relative to your new reference pressure (assuming this is what you really want)
- not sure about your stag.inlet since you need to know the stagnation conditions - you might not have compressible flow, so it is easier, otherwise need total pressure, total temperature - see Help topic Modeling Physics > Setting Up Physics > Setting Types > Boundary Types Reference > Stagnation Inlet


All times are GMT -4. The time now is 16:18.