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Laplacian Solver. Assigning different transport properties

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Old   November 23, 2009, 05:59
Default Laplacian Solver. Assigning different transport properties
  #1
mks
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Hello,

i'm trying to solve the following problem using LaplacianFoam: Temperature distribution in a solid consisting of two regions which have different heat transfer coefficients. How can one assign the transport properties (Heat coefficient in LaplacianFoam) to different regions?
The reason is to estimate the distribution of temperature through insulation containing several layers. Any ideas how do solve it? Maybe another solver?

Last edited by mks; November 23, 2009 at 09:45. Reason: Adding information
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Old   November 24, 2009, 09:53
Default Problem seems to be solved.
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I think i could solve the problem. For those who is interested in solution: I modified the standard solver LaplacianFoam. In the createFields.H I have changed the way, DT is read in just like the Temperature Field:

Info<< "Reading diffusivity D\n" << endl;

volScalarField DT
(
IOobject
(
"DT",
runTime.timeName(),
mesh,
IOobject::MUST_READ,
IOobject::AUTO_WRITE
),
mesh
);

Now in temestep 0/ folder create the file DT by copying+modifying the T file. I used the SetFieldsDict in system folder for assigning the DT values to the cell volumes:

defaultFieldValues
(
volScalarFieldValue DT 4e-04
);

regions
(
boxToCell
{
box ( 0 0 0 ) ( 1.5 3 0.1 );
fieldValues
(
volScalarFieldValue DT 1e-04
);
}
);

After compiling the new solver and running it i got a temperature distribution that seems to be right.
MarkW, Arslan Arshad, liub and 2 others like this.
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Old   April 7, 2015, 21:20
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can you share your case here?
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Old   April 8, 2015, 02:59
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  #4
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Hi Arslan,

yes I could share it, but it is not possible to attach here files larger than 97KB... Give me you email, so I can sent it to you.
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Old   April 8, 2015, 17:33
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arslan.arshad786@yahoo.com


THANK YOU
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Old   April 20, 2015, 11:04
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I did not get your mail.
Please send it to the email given below:
arslan.arshad786@yahoo.com
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Old   February 16, 2017, 03:36
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Can u share ur example with me?
ancolli@gmail.com
Thanks
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Old   February 16, 2017, 05:57
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Hi Alejandro,
just sent an email to you!
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Old   June 19, 2017, 09:18
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Hi,

I've been trying to do this for a while now.. Can any of you please mail me the modified solver files?

ID: ktk04spiker@gmail.com
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Old   November 20, 2017, 05:27
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Hi,
Can you please share your example with me.
email- gangrahul62@gmail.com

thanks
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Old   November 20, 2017, 06:00
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Hi rahul62,
sorry, I don't have this anymore. Please ask someone to whom I did send it previously, e.g. ktk04spiker@gmail.com, ancolli@gmail.com, arslan.arshad786@yahoo.com etc.
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Old   November 20, 2017, 09:39
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here it is...
Attached Files
File Type: zip mikaScalarTransportFoam.zip (101.5 KB, 52 views)
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Old   November 20, 2017, 11:04
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How to define different value of DT for different region. The above case doesn't contain 0 folder.
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Old   November 20, 2017, 11:16
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Quote:
Originally Posted by ancolli View Post
here it is...
Sorry. check this one
Attached Files
File Type: zip example.zip (8.9 KB, 66 views)
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Old   April 2, 2018, 08:27
Default Add heat source
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Hi Mks,

That is a wonderful way of assigning transport properties to different regions without having to go through toposet and splitMeshRegions process. But I want to know if it is possible to add heat sources to the different regions created by this way.

In fvOptions the possible selection modes are: all, cellSet, cellZone, points,,

Could you please shed some light on this.
__________________
Regards,
Shailesh
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Old   April 3, 2018, 09:11
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Quote:
Originally Posted by shaileshbg View Post
Hi Mks,

That is a wonderful way of assigning transport properties to different regions without having to go through toposet and splitMeshRegions process. But I want to know if it is possible to add heat sources to the different regions created by this way.

In fvOptions the possible selection modes are: all, cellSet, cellZone, points,,

Could you please shed some light on this.
I think in that case you should use a multi-region approach. Maybe someone else can give you a different (better) hint.
Regards
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Old   September 20, 2018, 04:41
Default How to give Heat transfer coefficient BCs and variable heat flu Laplacian OpenFoam5
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i'm trying to solve 3D conduction problem using LaplacianFoam OF5: Temperature distribution in a solid surrounded by of two regions which have different heat transfer coefficients and ambient Temperatures.And also how to give variable heat flux boundary condition.
I tried groovyBC, but it is not working, any other method please. I have only one region.
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Old   September 20, 2018, 08:26
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You need to use the multiRegion approach. GroovyBC is not working in that case. See tutorials >> heatTransfer >> chtMultiregionFoam and chtMultiregionSimpleFoam

here u have a detailed example for heat transfer

https://www.slideshare.net/ARPITSING...regiontutorial

or a simplified solver witth modified BC for an electrochemical problem

https://www.sciencedirect.com/scienc...170?via%3Dihub

under the multi-region approach

Regards
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Tags
heat transfer, laplacianfoam, laplacianschemes, multiregion, temperature


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