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Old   July 5, 2010, 09:08
Default Bad heat balance
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Hello everybody. I am using Star-CCM+ 5.02 and dual cells heat exchangers. When checking the heat balance I found that 700 W disappeared although the simulation converged.
I tried in 5.04 but same problem.
Any idea how to improve the heat balance?
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Old   July 6, 2010, 11:58
Default More information, please
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It is really hard to judge how you could improve your simulation with this sparse infomation.
Maybe you can describe a little bit more detailed what you have done, how you found the problem, what your domain looks like etc...
I don't even know if 700W are rather 0,00001% or 10000% of the desired heat flux, which makes a huge difference on judgement of the solution.
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Old   July 7, 2010, 10:45
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ok. sorry about that . 700W = more than 10% error. Not acceptable for me. The case is an heat exchanger I modeled with dual cells on both sides. I calculate the heat balance by making a heat transfer report on the inlets and outlets of both sides.
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Old   July 19, 2010, 05:03
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you should descibe your case and physical model ( steady, unsteady, laminar........, etc)
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