wall surface temperature

jinhuic86 · November 20, 2009, 21:45

I specify an internal heat generation for a solid block surrounded by the air domain, the surface temperature of that block is calculated based on free convection between the block and its surrounding air. the problem is the surface temperature is way too high. is it due to the mesh? Thanks.

Ahmed · November 21, 2009, 23:27

I do not think the mesh has got to do with the surface temperature in a natural convection problem, it depends, in your case, to how much is the amount of heat generation and the surface area (try to touch a 100W light bulb few minutes after you turn it on).
Good luck

jinhuic86 · November 22, 2009, 22:54

I am just concerned that the boundary layer may not be modeled properly with the mesh near the surface. Do you think those commercial codes might have issue on this? Thanks.

Ahmed · November 23, 2009, 00:25

if you are worried about the quality of your mesh, you can either
repeat your analysis with a denser mesh, or attach a picture of your mesh and details about your analysis so the readers of this forum can give their advice.
Good Luck

ztdep · November 24, 2009, 07:32

Dear friends:
I think the problem is the wrong heat source value in the block region.
recheck it.

November 20, 2009, 21:45	wall surface temperature	#1
jinhuic86 New Member Join Date: Nov 2009 Posts: 3 Rep Power: 16	I specify an internal heat generation for a solid block surrounded by the air domain, the surface temperature of that block is calculated based on free convection between the block and its surrounding air. the problem is the surface temperature is way too high. is it due to the mesh? Thanks.

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November 21, 2009, 23:27		#2
Ahmed Senior Member Ahmed Join Date: Mar 2009 Location: NY Posts: 251 Rep Power: 18	I do not think the mesh has got to do with the surface temperature in a natural convection problem, it depends, in your case, to how much is the amount of heat generation and the surface area (try to touch a 100W light bulb few minutes after you turn it on). Good luck

November 22, 2009, 22:54		#3
jinhuic86 New Member Join Date: Nov 2009 Posts: 3 Rep Power: 16	I am just concerned that the boundary layer may not be modeled properly with the mesh near the surface. Do you think those commercial codes might have issue on this? Thanks.

November 23, 2009, 00:25		#4
Ahmed Senior Member Ahmed Join Date: Mar 2009 Location: NY Posts: 251 Rep Power: 18	if you are worried about the quality of your mesh, you can either repeat your analysis with a denser mesh, or attach a picture of your mesh and details about your analysis so the readers of this forum can give their advice. Good Luck

November 24, 2009, 07:32		#5
ztdep Senior Member p ding Join Date: Mar 2009 Posts: 427 Rep Power: 19	Dear friends: I think the problem is the wrong heat source value in the block region. recheck it.