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heat transfer problem at outlet

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Old   May 1, 2015, 06:00
Default heat transfer problem at outlet
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i made heat transfer duct flow.
at end of pipe, wall and outlet temperature boundary condition is zero gradient.
in my thought, there is no reason that temperature is dropped.
but temperature becomes lower as pipe ended
look at my attatched picture. why it happen??
i used buoyantBoussinesqSimpleFoam.
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