Applying Heat Flux out of the surface in CFX

February 25, 2009, 20:32

How can we apply negative heat flux on a wall boundary in CFX?

February 25, 2009, 21:04

Ljaz，

You can set lower environment temperature to let heat flow out of the wall boundary... Wish help...

Rikio

February 26, 2009, 01:06

Thanks Rikio. The temperature at the boundary in question is not uniform. Therefore, applying a convective heat transfer coefficient in conjunction with a lower environment temperature would not ensure the flux value that I want to apply. I have tried applying a negative heat flux, but it results in non-physical results. In a software like CFX, there must be a way to apply negative flux. I would appreciate any suggestions from some experienced user.

February 26, 2009, 17:33

Hi,

CFX can handle negative heat fluxes just as well as positive ones. Sounds like you either have an inaccurate simulation or the negative heat flux you applied is non-physical.

Glenn Horrocks

February 25, 2009, 20:32	Applying Heat Flux out of the surface in CFX	#1
Ijaz Guest Posts: n/a	How can we apply negative heat flux on a wall boundary in CFX?

February 25, 2009, 21:04	Re: Applying Heat Flux out of the surface in CFX	#2
Rikio Guest Posts: n/a	Ljaz， You can set lower environment temperature to let heat flow out of the wall boundary... Wish help... Rikio

February 26, 2009, 01:06	Re: Applying Heat Flux out of the surface in CFX	#3
Ijaz Guest Posts: n/a	Thanks Rikio. The temperature at the boundary in question is not uniform. Therefore, applying a convective heat transfer coefficient in conjunction with a lower environment temperature would not ensure the flux value that I want to apply. I have tried applying a negative heat flux, but it results in non-physical results. In a software like CFX, there must be a way to apply negative flux. I would appreciate any suggestions from some experienced user.

February 26, 2009, 17:33	Re: Applying Heat Flux out of the surface in CFX	#4
Glenn Horrocks Guest Posts: n/a	Hi, CFX can handle negative heat fluxes just as well as positive ones. Sounds like you either have an inaccurate simulation or the negative heat flux you applied is non-physical. Glenn Horrocks

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