CFD Online Discussion Forums - How to solve a heat conduction between two different solid materials ?

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Hi Nakor,

this topic is interesting for me as well. I have only made first steps in source code modifications, but if you need support I will take a look at it. Maybe we can get it to work together.

Regards,

Michael

Hi,

i am using chtMultiRegionFoam and there are two parameters which i don't know. Ypmma, Ychar is any one know any thing about them.

thanks

Quote:

Originally Posted by rebel ahmed (Post 398933)

Hi,

i am using chtMultiRegionFoam and there are two parameters which i don't know. Ypmma, Ychar is any one know any thing about them.

thanks

Hi every body,

after searching and deep looking in openFoam files i think that Ypmma and Ychar represent two components of solid material with properties for every material and concentration so by using solid mixture models the properties of calculated on basis of these components.

please if any one has any idea about Ypmma, Ychar advice if this explanation is true or false.

thanks in advance,
:)

Hi,

first of all i want to thank everybody who keeps running this platform. The user cremona described a problem in #14 and i have the same problem. Openfoam displays me the mistake:" patch type 'patch' not type 'directMappedPatchBase' .Can anybody explain what it is about and how to correct it? In my work i want to simulate the thermal diffusion between two solids, like the user cremona did. Thanks:)

Hi sebastian,

you have to change the patch type of your wall from patch to mappedWall in your boundary file.

Tobi

Hi Tobias,

i am happy for your quick response :) My wall Patch is of type mappedWall. I was inspired by your work done for the user cremona; dont know where the mistake is :)

I ll have a look at this.

Which OF version do you use ?

I use Openfoam 2.0.1

Well okay.

There are some changes between 2.1. and 2.0.
I am using 2.1. and now 2.2.

The case I added in this thread is for 2.1.x

For y our problem have a look at the chtMulti tutorial and the patch types there. Use that one and everything should work.

Quote:

Originally Posted by nakor (Post 391262)

After some research, swak4foam does not seems to be adaptated to our problems.

It will average the temperature on each patch, so I will lose the spatial informations.

But I had an other idea before attempting to look into the boundary condition source code.

It seem that a baffle could answer to my problem. If I understand correctly how it is working, it could create a small region between the two solids, which will simulates the contact resistance with Rth=e/lambda*S

Code:

zone1_to_zone2

          {

              type            directMappedWallVariableThickness;

              // This thickness is used if the baffle is 1D.

              thickness       uniform 0.005;

          }

Does anyone have any previous experiense with those thermal baffles ?
thermal baffles release note

edit:Thermal baffle is perfect! But it is not adapted to mappedPatch, only to genericPatch :(
It seem that I will have to look inside the code of turbulentTemperatureCoupledBaffleMixed and try to modify it a bit..

Hi nakor
I am wondering have you solved thermal contact resistance between two solid domain?
I am looking for something similar as thermal contact in COMSOL.
https://www.comsol.com/blogs/thermal...ce-simulation/

Can you provide me some hints?
Thank you.
Liang

i have the same problem. i'm solving electric potential on fluid and solid domains and i have different electric permitivity so i had to use chtmultiregion to implement it and successfully did it , but the problem is when i tried to differentiate the electric potential field on solid and fluid to get electric field , i couldn't get a continous electric field across interface like electric potentail , so do you any idea how to solve it ?

does someone could give me the answere if it is now possible in openfoam to account for contact resistance between two solids or not?

using esi v2112

actually i solved my issue

for more infos see:

https://www.cfd-online.com/Forums/op...tml#post842830