Internal heat generation

Qbz · January 14, 2020, 23:03

Hi,

Is there a way to apply power to the body something like internal heat generation in steady-thermal instead of adding heat flux to the wall? Could you please tell me how to do it in Fluent (and in CFX as well).

Thanks.

Светлана · January 14, 2020, 23:20

In CFX-Pre, if you add a subdomain, you can set its "sources" such as a volumetric energy source. In ANSYS Fluent under "Cell Zone conditions" you can tick "Source Terms" and set the value for energy. Is this what you are after?

Qbz · January 14, 2020, 23:54

Quote:

Originally Posted by Светлана

In CFX-Pre, if you add a subdomain, you can set its "sources" such as a volumetric energy source. In ANSYS Fluent under "Cell Zone conditions" you can tick "Source Terms" and set the value for energy. Is this what you are after?

Thanks a lot for a quick reply. I think this is exactly what I needed. Could you please take a look if it should it be done like this if I want to apply it to the copper body? (with CFX it's my first time so I am clueless).

Qbz · January 15, 2020, 00:05

Why do I getting a thousand of errors trying to edit / post something here?

Светлана · January 15, 2020, 00:30

Could you please describe your problem in more detail? Describe the geometry and boundary conditions. Then it will be easier to tell where to add the heat source.

(Sorry about the website problems - what error messages do you get?)

Светлана · January 15, 2020, 00:35

I received your image link. What I saw:
- A pipe
- Ambient domain surrounding the pipe is meshed
- Inside of the pipe is not meshed
- A half of the surrounding fluid domain is marked as 'subdomain 1' in 'copper'. The screenshot is showing application of volumetric heat source in this half.

The question is, what is the real problem at hand?

Does the fluid flow inside of the pipe interest you?

Where is the heat coming from?

Many thanks.

Qbz · January 15, 2020, 00:49

Actually it is just an idea in my head. I need to do few cases for my masters thesis which is about CFD software benchmark. I use ANSYS and Autodesk CFD.

In this particular case I thought of a pipe inside a 2-material solid of which part is made of copper and aluminium. The inside of the pipe is meshed too which may not be really visible in this case. In this case I want to do a heat transfer comparison using different software, turbulence models and solvers.

So this ambient is really a solid. I was also thinking of doing some kind of external volume but haven't decided yet.

That subdomain 1 is the thing I created based on your advice in the copper solid part which i decided will be generating heat itself.

So I'm basically interested in everything - the temperature, pressures, velocities etc.

Светлана · January 15, 2020, 01:08

I see. I guess if the surrounding solid generates heat uniformly throughout the entire volume, then this setup is correct. This is in contrast to a case where heat is applied only on one side of the volume, which from your description does not appear to be the case.

January 14, 2020, 23:03	Internal heat generation	#1
Qbz New Member Jakub Join Date: May 2018 Posts: 6 Rep Power: 7	Hi, Is there a way to apply power to the body something like internal heat generation in steady-thermal instead of adding heat flux to the wall? Could you please tell me how to do it in Fluent (and in CFX as well). Thanks.

January 14, 2020, 23:20		#2
Светлана Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 407 Rep Power: 14	In CFX-Pre, if you add a subdomain, you can set its "sources" such as a volumetric energy source. In ANSYS Fluent under "Cell Zone conditions" you can tick "Source Terms" and set the value for energy. Is this what you are after? Qbz likes this.

January 15, 2020, 00:30		#5
Светлана Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 407 Rep Power: 14	Could you please describe your problem in more detail? Describe the geometry and boundary conditions. Then it will be easier to tell where to add the heat source. (Sorry about the website problems - what error messages do you get?) Qbz likes this.

January 15, 2020, 00:35		#6
Светлана Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 407 Rep Power: 14	I received your image link. What I saw: - A pipe - Ambient domain surrounding the pipe is meshed - Inside of the pipe is not meshed - A half of the surrounding fluid domain is marked as 'subdomain 1' in 'copper'. The screenshot is showing application of volumetric heat source in this half. The question is, what is the real problem at hand? Does the fluid flow inside of the pipe interest you? Where is the heat coming from? Many thanks. Qbz likes this.

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January 15, 2020, 00:05		#4
Qbz New Member Jakub Join Date: May 2018 Posts: 6 Rep Power: 7	Why do I getting a thousand of errors trying to edit / post something here?

January 15, 2020, 00:49		#7
Qbz New Member Jakub Join Date: May 2018 Posts: 6 Rep Power: 7	Actually it is just an idea in my head. I need to do few cases for my masters thesis which is about CFD software benchmark. I use ANSYS and Autodesk CFD. In this particular case I thought of a pipe inside a 2-material solid of which part is made of copper and aluminium. The inside of the pipe is meshed too which may not be really visible in this case. In this case I want to do a heat transfer comparison using different software, turbulence models and solvers. So this ambient is really a solid. I was also thinking of doing some kind of external volume but haven't decided yet. That subdomain 1 is the thing I created based on your advice in the copper solid part which i decided will be generating heat itself. So I'm basically interested in everything - the temperature, pressures, velocities etc.

January 15, 2020, 01:08		#8
Светлана Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 407 Rep Power: 14	I see. I guess if the surrounding solid generates heat uniformly throughout the entire volume, then this setup is correct. This is in contrast to a case where heat is applied only on one side of the volume, which from your description does not appear to be the case.