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Error in temperature contour while post processing

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Old   March 6, 2019, 12:43
Default Error in temperature contour while post processing
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SwapnilN
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Hello gentlemen...
I have performed simulation in fluent.
The geometry is "Two concentric cylinders are there, inner cylinder is filled with activated carbon and hot water is flowing through the outer cylinder"..
In this case I want to see the variation of temperature inside activated carbon...
but after complete simulation when I plotted temperature contour, everywhere the temperature is showing equal even though the colors are different everywhere.
Please find attached the temperature contour..

Kindly guide me onto this..
Attached Images
File Type: png Temperature contour.png (37.8 KB, 5 views)
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Old   March 7, 2019, 06:05
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Moritz Kuhn
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You are sure, that your solid domain (activated carbon) is connected to your fluid (hot water) domain? What is the heat flux on the boundary between these to domains? It should be not zero.
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Old   March 8, 2019, 01:05
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Thanks for your reply Moritz Kuhn sir.
Yes, the solid domain and fluid domain are connected to each other. I used ICEM-CFD for generating the mesh.
Previously I did not apply the heat flux but even after applying the heat flux, the temperature contour seems problematic.
I am expecting the temperature at the outer boundary of activated carbon to be higher as compared to the central portion.
But the temperature in the activated carbon region is uniform.
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Old   March 8, 2019, 04:25
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Quote:
Originally Posted by Swapnil Narkhede View Post
I am expecting the temperature at the outer boundary of activated carbon to be higher as compared to the central portion.

Maybe not...are you running a steady state simulation?

The diameter of the inner cylinder containing carbon is not so big, so it could be that the temperature will reach a uniform value in the steady state.
Try to run an unsteady simulation and monitor the temperature (especially in the first time steps) to see everything is setup correctly between interfaces (interfaces, heat flux, material properties, check thermal conductivity, etc.). Then, look at the transient of the temperature of your solid to see how it evolves.
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Old   March 8, 2019, 05:24
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Thanks for your suggestion.
Actually, the diameter is not so big, so that may be the case.
Yes, I am running a steady state simulation.
Now as you suggested I will try with an unsteady state simulation.
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