How to create constant q heater?

Scot · April 25, 2011, 18:30

In the chtMultiRegionFoam tutorials, the heaters have a hot face (such as the bottom of the T-shaped heater) set at constant temperature like 500K. Is it possible to make the heater have a constant output instead, such as 100 Watts? Thanks, Scot

bhh · April 26, 2011, 01:33

Check out
http://www.cfd-online.com/Forums/ope...nsfer+boundary

rgds
Bjorn

val46 · April 26, 2011, 04:31

Hi Scot,

at the moment there is no solver for this problem but quite a few people are working on that issue.

Check out http://www.cfd-online.com/Forums/ope...egionfoam.html

or search the forum for "heat source"

Regards,
Toni

Scot · April 26, 2011, 14:34

Thank you, Bjorn. I like the simplicity of your answer but as I have tried to implement it in /system/heater/changeDictionaryDict, the model runs fine but q is simply ignored. I cranked q up to 10,000W with no effect on T anywhere.

The code reads:
dictionaryReplacement {
T {
internalField uniform 293;
boundaryField {
".*" {
type compressible::turbulentTemperatureCoupledBaffleMix ed;
neighbourFieldName T;
K K;
heatSource power;
q uniform 10000;
value uniform 293; }}}

The stuff above "heatSource power" was already there and I get a crash if I remove any of it. Any idea why q is ignored? Thank you! Scot

April 25, 2011, 18:30	How to create constant q heater?	#1
Scot New Member Scot Johnson Join Date: Mar 2011 Posts: 25 Rep Power: 15	In the chtMultiRegionFoam tutorials, the heaters have a hot face (such as the bottom of the T-shaped heater) set at constant temperature like 500K. Is it possible to make the heater have a constant output instead, such as 100 Watts? Thanks, Scot

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April 26, 2011, 01:33		#2
bhh Member Bjorn H. Hjertager Join Date: Mar 2009 Posts: 72 Rep Power: 17	Check out http://www.cfd-online.com/Forums/ope...nsfer+boundary rgds Bjorn

April 26, 2011, 04:31		#3
val46 Member Join Date: Nov 2009 Location: Germany Posts: 96 Rep Power: 17	Hi Scot, at the moment there is no solver for this problem but quite a few people are working on that issue. Check out http://www.cfd-online.com/Forums/ope...egionfoam.html or search the forum for "heat source" Regards, Toni

April 26, 2011, 14:34		#4
Scot New Member Scot Johnson Join Date: Mar 2011 Posts: 25 Rep Power: 15	Thank you, Bjorn. I like the simplicity of your answer but as I have tried to implement it in /system/heater/changeDictionaryDict, the model runs fine but q is simply ignored. I cranked q up to 10,000W with no effect on T anywhere. The code reads: dictionaryReplacement { T { internalField uniform 293; boundaryField { ".*" { type compressible::turbulentTemperatureCoupledBaffleMix ed; neighbourFieldName T; K K; heatSource power; q uniform 10000; value uniform 293; }}} The stuff above "heatSource power" was already there and I get a crash if I remove any of it. Any idea why q is ignored? Thank you! Scot