Sub - Domain Energy Source

Kapi · April 10, 2017, 03:02

Hi Guys,

In my model I have domains, sub-domains, initializations, interfaces and equations.
I have been using domains by providing Energy values (W/m3) in Sub-domains and solving my model.

Is it possible to give fixed value of temperature(K) to sub-domains?
so rather than calculating the temperature distribution in sub-domain based on losses, it just knows what the temperature will be of that particular sub-domain?

The only option it gives under Sources is Energy and cant choose any other equation sources.

Thanks for help in advance

Cheers
KAPI

ghorrocks · April 11, 2017, 20:13

Use a source term to pull the temperature to a determined value. Here's how: constant temperature heat source in subdomain

Kapi · April 17, 2017, 20:18

Hi Glenn,

I am trying to find the tutorial/example in documentation you mentioned but not yet successful. I read your comment but in my situation I have 500+ sub-domains and its not feasible to use equations for all of them unless I can create a table and somehow access it in each sub-domain.

Cheers
Kapi

Kapi · April 18, 2017, 02:45

I figured rather than creating sub-domains and giving equation for fixed temperature, I can just create boundary and give fixed temperature to wall/symmetry for each body.

Hope it helps someone

Cheers
KAPI

ghorrocks · April 18, 2017, 02:49

Modelling 500+ separate thermal areas is rarely a good idea. If you have so many then you should consider:
* a reduced order model,
* combining regions into a small number of representative averages covering a number of individual sources
* Modelling a single region and extrapolating that to the rest
* Many other methods exist depending on the exact model you are attempting.

Kapi · April 18, 2017, 20:45

got no option Glenn sadly, Need to see thermal effect on each and every part because of the behavior of bodies.
I have tried everything you mentioned but the accuracy is reduced which is big No for my modelling.
Have around 100 odd sub-domains in each domain (max of 5 domains), Normally I give losses in each sub-domain to see the thermal effect but I need to check the model with fixed temperature

ghorrocks · April 18, 2017, 20:59

Can you explain what you are modelling and what you are trying to learn?

April 10, 2017, 03:02	Sub - Domain Energy Source	#1
Kapi Senior Member Join Date: Apr 2014 Location: Melbourne Posts: 584 Rep Power: 15	Hi Guys, In my model I have domains, sub-domains, initializations, interfaces and equations. I have been using domains by providing Energy values (W/m3) in Sub-domains and solving my model. Is it possible to give fixed value of temperature(K) to sub-domains? so rather than calculating the temperature distribution in sub-domain based on losses, it just knows what the temperature will be of that particular sub-domain? The only option it gives under Sources is Energy and cant choose any other equation sources. Thanks for help in advance Cheers KAPI

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April 11, 2017, 20:13		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,011 Rep Power: 146	Use a source term to pull the temperature to a determined value. Here's how: constant temperature heat source in subdomain

April 17, 2017, 20:18		#3
Kapi Senior Member Join Date: Apr 2014 Location: Melbourne Posts: 584 Rep Power: 15	Hi Glenn, I am trying to find the tutorial/example in documentation you mentioned but not yet successful. I read your comment but in my situation I have 500+ sub-domains and its not feasible to use equations for all of them unless I can create a table and somehow access it in each sub-domain. Cheers Kapi

April 18, 2017, 02:45		#4
Kapi Senior Member Join Date: Apr 2014 Location: Melbourne Posts: 584 Rep Power: 15	I figured rather than creating sub-domains and giving equation for fixed temperature, I can just create boundary and give fixed temperature to wall/symmetry for each body. Hope it helps someone Cheers KAPI

April 18, 2017, 02:49		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,011 Rep Power: 146	Modelling 500+ separate thermal areas is rarely a good idea. If you have so many then you should consider: * a reduced order model, * combining regions into a small number of representative averages covering a number of individual sources * Modelling a single region and extrapolating that to the rest * Many other methods exist depending on the exact model you are attempting.

April 18, 2017, 20:45		#6
Kapi Senior Member Join Date: Apr 2014 Location: Melbourne Posts: 584 Rep Power: 15	got no option Glenn sadly, Need to see thermal effect on each and every part because of the behavior of bodies. I have tried everything you mentioned but the accuracy is reduced which is big No for my modelling. Have around 100 odd sub-domains in each domain (max of 5 domains), Normally I give losses in each sub-domain to see the thermal effect but I need to check the model with fixed temperature

April 18, 2017, 20:59		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,011 Rep Power: 146	Can you explain what you are modelling and what you are trying to learn?