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-   -   high temperature in a coupling simulation (http://www.cfd-online.com/Forums/star-ccm/80300-high-temperature-coupling-simulation.html)

sheintz September 22, 2010 05:21

high temperature in a coupling simulation
 
Hello,
i'm trying to simulate the flow into a bend (90) with a coupling between Star-CCM+ and GT-Power.
The boudaries are :
inlet, bend and outlet temperature : 300K
inlet pressure : sinusoidal from 1 to 1,5 bar (period 0,04 s)
bend and outlet pressure : 1 bar
compressible ideal gas (O2 and N2)
I can simulation the flow but the temperature in the bend is 1300K at the end.
Why do I get this temperature ?
Thank you in advance
Best regards
Simon

nomad September 23, 2010 13:43

Is the flow fully converged? Are the residuals and any flow quantities you are measuring fully converged? Is this 1300K only in a few cells or across a bigger region?

sheintz September 26, 2010 05:22

Quote:

Originally Posted by nomad (Post 276367)
Is the flow fully converged? Are the residuals and any flow quantities you are measuring fully converged? Is this 1300K only in a few cells or across a bigger region?

Hello,
The high temperature is located in a big region of the bend.
Can I use the residuals when I calculate unsteady ? My residuals are onto 10^6 for Tdr and 10^4 for the others (for a steady calculation it's not good and for a unsteady simulation?).
Thank you
Best regards

nomad September 30, 2010 14:56

The size of the residual doesn't really matter so long as the value, or the mean of the residual oscillation remains fairly constant from one iteration to the next.


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