Temperatures on sides of the interface don't match

Attesz · February 15, 2011, 14:31

Hi CFX users,

I'm doing a complex heat transfer simulation. On the picture attached you can see a Solid-Fluid Interface Side 1 and 2, and the temperatures don't match. The left one seems to be correct, but the right one is probably wrong. I've attached the interface settings. The areas of the interfaces equals. What can cause this problem, or is it a post error?

Thanks in advance,
Attila

nevleges_V2_004.jpg

interface.JPG

stumpy · February 15, 2011, 15:05

There not supposed to match. One is showing the fluid temperature and the other the solid temperature.

Attesz · February 16, 2011, 05:56

But they should match, because we talk about the same physical surface, or am I wrong? Is it a numerical thing?

On the other hand, the mesh sizes don't match on the sides. The solid interface has 3 times larger elements in the tangential direction than the fluid, however the axial directions match.

In the Post, the Temperature plotting is enough, or is there any trick to postprocess the results?

Thanks

stumpy · February 16, 2011, 10:59

The temperature of the physical surface would be the solid side temperature. In general the fluid flowing over that surface would not be at the same temperature as the solid surface.

Attesz · February 16, 2011, 11:40

Ok, thank you, I tought about it and it is really unambiguous.

February 15, 2011, 14:31	Temperatures on sides of the interface don't match	#1
Attesz Senior Member Attesz Join Date: Mar 2009 Location: Munich Posts: 368 Rep Power: 17	Hi CFX users, I'm doing a complex heat transfer simulation. On the picture attached you can see a Solid-Fluid Interface Side 1 and 2, and the temperatures don't match. The left one seems to be correct, but the right one is probably wrong. I've attached the interface settings. The areas of the interfaces equals. What can cause this problem, or is it a post error? Thanks in advance, Attila nevleges_V2_004.jpg interface.JPG Last edited by Attesz; February 15, 2011 at 14:35. Reason: attachments

February 16, 2011, 05:56		#3
Attesz Senior Member Attesz Join Date: Mar 2009 Location: Munich Posts: 368 Rep Power: 17	But they should match, because we talk about the same physical surface, or am I wrong? Is it a numerical thing? On the other hand, the mesh sizes don't match on the sides. The solid interface has 3 times larger elements in the tangential direction than the fluid, however the axial directions match. In the Post, the Temperature plotting is enough, or is there any trick to postprocess the results? Thanks Last edited by Attesz; February 16, 2011 at 06:57.

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February 15, 2011, 15:05		#2
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	There not supposed to match. One is showing the fluid temperature and the other the solid temperature.

February 16, 2011, 10:59		#4
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	The temperature of the physical surface would be the solid side temperature. In general the fluid flowing over that surface would not be at the same temperature as the solid surface.

February 16, 2011, 11:40		#5
Attesz Senior Member Attesz Join Date: Mar 2009 Location: Munich Posts: 368 Rep Power: 17	Ok, thank you, I tought about it and it is really unambiguous.