# high temperature in a coupling simulation

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 September 22, 2010, 04:21 high temperature in a coupling simulation #1 Member   Heintz Simon Join Date: Sep 2009 Location: Germany Posts: 36 Rep Power: 7 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

 September 23, 2010, 12:43 #2 Member   John Join Date: Aug 2009 Posts: 93 Rep Power: 7 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?

September 26, 2010, 04:22
#3
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Heintz Simon
Join Date: Sep 2009
Location: Germany
Posts: 36
Rep Power: 7
Quote:
 Originally Posted by nomad 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

 September 30, 2010, 13:56 #4 Member   John Join Date: Aug 2009 Posts: 93 Rep Power: 7 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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