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Heat Transfer over tubes: strange temperature increase

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Old   May 24, 2022, 17:10
Default Heat Transfer over tubes: strange temperature increase
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Ellery
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Hello,

I am simulating air flow over bare tubes w/ constant temperature.
I am running into an interesting issue where the flow after the bare tubes seems to be increasing, but there should be no more heat flux. I am not sure why temperature seems to be increasing even though the air velocity has been resolved downstream of the bare tubes. This phenomenon doesn't seem to happen when I do not assume symmetry, but rather treat the bottom and top boundary as a wall with zero shear stress. Is there some type of dissipation term here that is adding heat downstream of the bare tubes that I am missing? The temperature and velocity contours are attached in the pictures. Any help is appreciated.

Model Info:
k-epsilon, enhanced wall
air - ideal gas
boundary conditions (Please see picture)
residuals: continuity, x-vel,y-vel = 1E-5 , energy = 1E-6, k, epsilon = 1E-3
Solver: steady pressure based
scheme: coupled, all second order, pseudo transient
Attached Images
File Type: png StaticTempContours.PNG (58.5 KB, 10 views)
File Type: jpg Boundaryconditions.jpg (23.5 KB, 9 views)
File Type: png Xvelocity_contours.PNG (43.4 KB, 9 views)
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fluent, heat transfer, temperature contours

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