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divergence in energy residuals

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Old   May 21, 2008, 10:29
Default divergence in energy residuals
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swarley
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hi

I am solving the heat transfer and flow problem inside a notebook chassis. Although momentum and continuity residuals converges, my energy residual diverge. While calculating the iterations "temperature limited to 1 in ... cells" is written on the screen for different zones.

Any idea about this??? Thanks
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Old   May 21, 2008, 12:10
Default Re: divergence in energy residuals
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Sasha
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I don't know all your bc concerning heat (generation/sink) but you could use the following: 1. reduce energy URF 2. limit temperature to the expected minimum - the "temperature limited to 300 in ... cells" may disappear during the solution
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Old   May 22, 2008, 08:09
Default Re: divergence in energy residuals
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swarley
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thanks sasha!!

i tried your advice, but it doesn't work. To be more clear about my bc's: in the system there are some component which generates heat, two fans which cools down a heat exchanger and natural convection is the bc for the chassis walls. The notebook system is modelled as a rectangular box.
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