Inlet pressure vs mass flow diference
Hello everybody,
I am trying to make calculation of flow in turbocharger, I have one rotary domain there, but I have discover that when I set up mass flow BC on inlet and in res file I calculate pressure on inlet and than i set this pressure as a total or static (tryed both ) pressure on inlet I get dífferent values of mass flow in second case. Can you help me dicover what is going on ? 
Did you average the pressure, or keep the pressure distribution over the inlet patch?

Hi
I calculated avagare pressure. One possibilities is that I/O pressure to pressure is no so strongly defined than the mass flow on inlet and it gives to solver some freedom to get equilibrium. My model is qiute complicated, 4 domain , 1 static interfaces and 2 frozen rotors. What do you think about this assumption ? Thanks M. 
Quote:
If you are applying a constant pressure across the boundary then that is an obvious difference to the mass flow inlet where pressure varies across the boundary. 
Yeah Glenn, you are right that the comparison of pressure from BC (constant value) and the pressures from .res with BC mass > P2 when P1 is changing across the boundary brings some mistake, but difference was much bigger. I was wondering if somebody has some experience with this efect. (Big difference between inlet pressure if it is set as BC or if it is calculated as a result of mass flow on inlet BC, I have to doublecheck that all cases had been converged enought, but i do not think there can be a problem ). We have made some measurement in real condition, and results from calculation was much more close to it , when I used mass> P2 BCs.

Quote:
Hope to help :D 
All times are GMT 4. The time now is 01:56. 