[Roh]

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]

Found something:


youtube.com/watch?v=oCntLSAWEVo


Is it a valid tutorial?

[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.

[Roh]

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]

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]

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

mesh m-z s-i-b

that's it

best regards

[Roh]

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?

Originally Posted by AlexanderZ

...
4. type in console following command

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]

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]

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