CFD Online Discussion Forums

CFD Online Discussion Forums (
-   OpenFOAM Running, Solving & CFD (
-   -   Question about coodles (

tangd June 20, 2006 03:58

I created a model in coodles u
I created a model in coodles using the existed pitzDaily mesh as template. I try to implement totalPressure and fix the temperature at inlet, while static pressure at outlet.

But there is no such boundary type I can use directly from FoamX, so I chose pressureInlet for inlet, and then changed pressure type from "fixedValue" to "totalPressure". I read from board and found that pressureTransmissive is helpful, so I applied pressureTransmissiveOutlet boundary type for outlet. I assigned 100bar to inlet totalPressure, and kept the outlet pressure setting from pitzDaily which is
type pressureTransmissive;
pInf 1e5;
lInf 0.3;
value uniform 1e5;

I expected that the pressure difference will result in mass flow inside the system then achieved a stable status. But from the plot Courant number over time, I observed the oscillation always occurring, it doesn't tend to stability. I think that the boundary condition was not correctly imposed. Can somebody give me some tips about how to set the boundary condition correctly? Thank you so much!

All times are GMT -4. The time now is 09:51.