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Old   March 19, 2013, 18:05
Default Help Setting up Heat Transfer
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AJ Hunter
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I am trying to set up a system where there is a heat source inside of a wall that is being struck by a moving fluid:

| |
| |
| |
| | <---- Fluid
| |
| |
| |
Wall

My problem is that I can't seem to get the fluid to absorb heat from the wall source. The temperature of the fluid is the same throughout the post-output.

The heat inside the wall comes from a user function and it appears to be working properly (changing the function changes the final temperature). Additionally, it appears as if the wall is being properly cooled by the fluid (Change in fluid velocity changes temperature of the wall).

Is there a tutorial out there that anyone could point me to that would be helpful? Or is there an easy/obvious solution to what I am doing wrong?
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Old   March 19, 2013, 18:28
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Glenn Horrocks
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It sounds like you have not put an interface between the solid and fluid domains. The interface does the coupling between the domains.
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Old   March 19, 2013, 18:38
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AJ Hunter
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I have made interfaces, but it might not be correctly done. In the wall domain I have an interface on the surface of the wall and I have its Heat Transfer set to "Conservative Interface Flux". I have an additional interface in the fluid domain, on the "fluid wall" and it has the same settings (along with the additional fluid settings such as No Slip and Smooth Wall).
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Old   March 19, 2013, 19:14
Default Link to picture of my setup
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AJ Hunter
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https://plus.google.com/u/0/photos/1...95989585547202

That is a link to the picture of my geometry and my domain, subdomain, and interface tree.
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Old   March 20, 2013, 07:06
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Glenn Horrocks
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Also check the interface non-overlap area in CFD-Post. That will show you any sections of the interface which do not connect.

The link is not visible for me.
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Old   March 20, 2013, 17:20
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AJ Hunter
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That link should now work since I shared the image as public.

If you can view it, you will see a disk at the very top of the image. This represents the heat source wall. The fluid does not strike the entire thing, only the center of the disk. This center of the disk also happens to be where all the heat generation takes place. Based on the area ratio of the fluid interface to the size of the aluminum disk, the values in the output make sense.

Domain Interface Name : Al Water

Discretization type = GGI
Intersection type = Direct
Non-overlap area fraction on side 1 = 5.90E-01
Non-overlap area fraction on side 2 = 0.00E+00
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Old   March 23, 2013, 17:09
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Quote:
Originally Posted by ajhunte View Post
https://plus.google.com/u/0/photos/1...95989585547202

That is a link to the picture of my geometry and my domain, subdomain, and interface tree.

Couldn't see your file. Pls upload it with your reply.
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