fluid to solid heattransfer with chtMultiRegionFoam

schteff · August 10, 2010, 04:48

Hi,

is it possible to make the heattransfer from a fluid- to a solidregion with the chtMultiRegionFoam solver. My case runs good when I have a "solidheater" but it doesn´t work in the other direction!

Has anybody an idea?

thank you!

schteff

val46 · August 11, 2010, 08:08

Hi,

what do you mean by "in the other direction"?

schteff · August 11, 2010, 09:07

Oh sorry,

I have hot air in one region and I want to simulate the heattransfer through two solid regions into a water region.

My proplem is, that the solid regions hold the temperature of the beginning.

Do I have to modify the boundary settings?

I hope you understand the problem.

schteff

schteff · August 13, 2010, 05:03

Hi,

to avoid other misstakes in my mesh, I tried to solve my problem in the multiRegionHeater tutorial.

My question is now:

Is it possibleto heat up the bottom-air-region and simulate the heattransfer through the solid-regions into the topair-region?
(without heating the heater-region)

I tried it, but the solid-region hold theit temperatures! (1000s simulated Time)

thanks

schteff

val46 · August 20, 2010, 04:54

Hi,

Quote:

Is it possible to heat up the bottom-air-region and simulate the heattransfer through the solid-regions into the topair-region?
(without heating the heater-region)

Yes, it is possible. I just tried it and it worked. (I did it the other way around but i think this makes no difference.)
I heated the solids (300K) with the topair fluid (600K at minX). After 1000s i got a max Temperature of the bottomAir domain of 309 K

Not sure if these values are totally physically correct (especially because the mesh is very coarse). But the solution tends in the right direction

Regards,
Toni

EDIT: Oh, by the way, I tried it with chtMultiRegionSimpleFoam. But I think it shouldn't make any difference.

schteff · August 20, 2010, 07:45

thank you,

yes it works

!

My thermophysical properties were the problem!!!

Don´t know why! because I just copied from the tutorial...

with sutherlandTransport it works a bit better!

August 10, 2010, 04:48	fluid to solid heattransfer with chtMultiRegionFoam	#1
schteff New Member Join Date: Aug 2010 Posts: 7 Rep Power: 15	Hi, is it possible to make the heattransfer from a fluid- to a solidregion with the chtMultiRegionFoam solver. My case runs good when I have a "solidheater" but it doesn´t work in the other direction! Has anybody an idea? thank you! schteff

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August 11, 2010, 08:08		#2
val46 Member Join Date: Nov 2009 Location: Germany Posts: 96 Rep Power: 16	Hi, what do you mean by "in the other direction"?

August 11, 2010, 09:07		#3
schteff New Member Join Date: Aug 2010 Posts: 7 Rep Power: 15	Oh sorry, I have hot air in one region and I want to simulate the heattransfer through two solid regions into a water region. My proplem is, that the solid regions hold the temperature of the beginning. Do I have to modify the boundary settings? I hope you understand the problem. schteff

August 13, 2010, 05:03		#4
schteff New Member Join Date: Aug 2010 Posts: 7 Rep Power: 15	Hi, to avoid other misstakes in my mesh, I tried to solve my problem in the multiRegionHeater tutorial. My question is now: Is it possibleto heat up the bottom-air-region and simulate the heattransfer through the solid-regions into the topair-region? (without heating the heater-region) I tried it, but the solid-region hold theit temperatures! (1000s simulated Time) thanks schteff

August 20, 2010, 07:45		#6
schteff New Member Join Date: Aug 2010 Posts: 7 Rep Power: 15	thank you, yes it works ! My thermophysical properties were the problem!!! Don´t know why! because I just copied from the tutorial... with sutherlandTransport it works a bit better!