Can we use fluent to simulate heat transfer in a solid body?(without fluid)

Roh · January 18, 2019, 12:56

Guys,
I'm thinking to model/simulate heat transfer in a solid body. Is fluent capable of doing it? or fluent just simulate heat transfer between fluid-solid?

If fluent is capable of simulating heat transfer in solid bodies, how can I do it? tried to find any clue but my efforts have failed so far.

Roh · January 18, 2019, 13:11

Found something:

youtube.com/watch?v=oCntLSAWEVo

Is it a valid tutorial?

LuckyTran · January 18, 2019, 13:30

Yes Fluent does this. Just turn on the energy equation. Assign the cell zone as a solid. You still need to choose a flow model (i.e. laminar) that is valid with an energy equation (choosing inviscid doesn't work). Other than that, it is straightforward if you know how to do anything in Fluent.

Roh · January 22, 2019, 03:35

Quote:

Originally Posted by LuckyTran

Yes Fluent does this. Just turn on the energy equation. Assign the cell zone as a solid. You still need to choose a flow model (i.e. laminar) that is valid with an energy equation (choosing inviscid doesn't work). Other than that, it is straightforward if you know how to do anything in Fluent.

I was trying to find any technical/application note of Fluent about heat transfer in solid.

Found this:

https://www.scribd.com/document/2459...8-HeatTransfer

And

http://www.afs.enea.it/fluent/Public.../PDF/chp11.pdf

In page 6 you can see this equation:

On the LHS of the equation, the convective is zero then on the whole LHS is zero. On the RHS we don't have source term and then Fluent just solve conduction term for our field. Is it right? kinda Fourier's law. right?

Another question, Why cannot I find many thing about heat modeling of solids in fluent? e.g. you said we need to choose laminar for this job but where can I find this note?

LuckyTran · January 22, 2019, 09:00

Yes 11.2-11 on pg 6 is what Fluent solves in solids. It is a generalization of the canonical heat diffusion equation for moving solids. Fourier's law is the 1st term on the RHS. If the velocity is zero only the 2nd term on the LHS is 0, you still have the unsteady term.

You have to choose a viscous model in Fluent, you cannot turn them off. You need an energy equation. You can find this out in a few seconds in Fluent by clicking buttons. There's no need to spend 5 minutes reading it in any document.

Also before you click the calculate button it might be helpful to freeze the flow solver.

AlexanderZ · January 22, 2019, 20:22

there is nothing special with simulation of heat transfer in solid bodies.
1. apply different materials to your zones
2. switch on energy equation
3. switch off flow equations
4. type in console following command

Code:

mesh m-z s-i-b

that's it

best regards

Roh · January 23, 2019, 02:08

Quote:

Originally Posted by AlexanderZ

...
3. switch off flow equations...

I will do it as said in this post:

How to turn off flow solver in fluent

Is it okay?
And I think disabling or enabling the flow equations don't make any change and just help to have a quicker solution. Is it right?

Quote:

Originally Posted by AlexanderZ

...
4. type in console following command

Code:

mesh m-z s-i-b

that's it
...

As said here:

Divergence Problem Conjugated Heat Transfer

I think it's JUST for creating shadow. I have just one material. thus don't need it currently. Am I right?

Previosly I have solved my fluid problem and I exported the temp. profile and importing it for my heat transfer problem. I guess this appraoch helped to have a quicker solution because the solver doesn't need to solve aditional equation (energy equation in solid) for each iteration.

LuckyTran · January 23, 2019, 08:51

Yes, follow that post for how to turn off the flow equations.

I have no idea why the console command mesh blah blah blah was recommended.

AlexanderZ · January 23, 2019, 23:49

Quote:

I think it's JUST for creating shadow. I have just one material. thus don't need it currently. Am I right?

yes, this command creates shadows between zones with different materials

best regards

January 18, 2019, 12:56	Can we use fluent to simulate heat transfer in a solid body?(without fluid)	#1
Roh Senior Member Join Date: Sep 2017 Posts: 130 Rep Power: 8	Guys, I'm thinking to model/simulate heat transfer in a solid body. Is fluent capable of doing it? or fluent just simulate heat transfer between fluid-solid? If fluent is capable of simulating heat transfer in solid bodies, how can I do it? tried to find any clue but my efforts have failed so far.

January 18, 2019, 13:30		#3
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Yes Fluent does this. Just turn on the energy equation. Assign the cell zone as a solid. You still need to choose a flow model (i.e. laminar) that is valid with an energy equation (choosing inviscid doesn't work). Other than that, it is straightforward if you know how to do anything in Fluent. Roh and racing_student like this. Last edited by LuckyTran; January 18, 2019 at 15:33.

January 22, 2019, 09:00		#5
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Yes 11.2-11 on pg 6 is what Fluent solves in solids. It is a generalization of the canonical heat diffusion equation for moving solids. Fourier's law is the 1st term on the RHS. If the velocity is zero only the 2nd term on the LHS is 0, you still have the unsteady term. You have to choose a viscous model in Fluent, you cannot turn them off. You need an energy equation. You can find this out in a few seconds in Fluent by clicking buttons. There's no need to spend 5 minutes reading it in any document. Also before you click the calculate button it might be helpful to freeze the flow solver. Roh likes this. Last edited by LuckyTran; January 23, 2019 at 08:53.

January 22, 2019, 20:22		#6
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	there is nothing special with simulation of heat transfer in solid bodies. 1. apply different materials to your zones 2. switch on energy equation 3. switch off flow equations 4. type in console following command Code: mesh m-z s-i-b that's it best regards Roh likes this.

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January 18, 2019, 13:11		#2
Roh Senior Member Join Date: Sep 2017 Posts: 130 Rep Power: 8	Found something: youtube.com/watch?v=oCntLSAWEVo Is it a valid tutorial?

January 23, 2019, 08:51		#8
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Yes, follow that post for how to turn off the flow equations. I have no idea why the console command mesh blah blah blah was recommended.