CFD Online Discussion Forums - chtMultiRegionFoam

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chtMultiRegionFoam

Hello Foamers
when I increase velocity there is no temperature drop in forced convection in multiregionFoam

I gave coupledBaffledmixed BC at the interface

what could be the possible reasons, any suggestions are always welcome

Thanks in advance

To make a clear statement, you should provide more information -> https://www.cfd-online.com/Forums/op...-get-help.html

Actually that problem is solved
can you tell me how to implement thermal conductivity values x y z like kx ky and kz in thermo physical properties
As far as i i gave it as following

Code:

thermoType

{

    type            heSolidThermo;

    mixture         pureMixture;

    //transport       constIso;

    transport       constAnIso; //<--this bit

    thermo          hConst;

    equationOfState rhoConst;

    specie          specie;

    energy          sensibleEnthalpy;

}



    coordinateSystem

    {

        type    cartesian;

        origin  (0 0 0);

        coordinateRotation

        {

            type        cylindrical;

            e3          (0 0 1);

        }

    }

mixture

{

    specie

    {

        molWeight   59.54353776;

    }



    transport

    {

        kappa   (73.98 73.98 29.627435); //radial tangential longitudinal or x y z

    }



    thermodynamics

    {

        Hf      0;

        Cp      2300;

    }



    equationOfState

    {

        rho     2436;

    }

}

but that is for cylindrical not for cartesian

Thanks in advance

Hi bharadwaz，
How did you solve your issue? Thanks!

thermoType
{
type heSolidThermo;
mixture pureMixture;
transport constAnIso;
thermo hConst;
equationOfState rhoConst;
specie specie;
energy sensibleEnthalpy;
}

coordinateSystem
{
type cartesian;
origin (0 0 0);
coordinateRotation
{
type STARCDRotation;
rotation (0 0 0);
}
}

mixture
{
specie
{
molWeight 59.54353776;
}
equationOfState
{
rho 2436;
}
transport
{
kappa (10 10 10);
}

thermodynamics
{
Hf 0;
Cp 2300;
}
}
Hope this helps you

anisotropic kappa

chtMultiRegionFoam in OpenFoam-8 give incorrect results with anisotropic conductivity.
Case file attached

Some small description would be handsome.

What is the problem? Did you have a comparision with other versions? What is the expected result? ...

If I will investigate into that, I would prefer to have more information first.

Quote:

Originally Posted by suroy2005 (Post 779901)

chtMultiRegionFoam in OpenFoam-8 give incorrect results with anisotropic conductivity.
Case file attached

Most likely you missed the entry for anialpha in your T file, have a look at this:

https://www.cfd-online.com/Forums/op...tml#post745843

With the added entry

Code:

alphaAni Anialpha;

your example is working.

Quote:

Originally Posted by Tobi (Post 780070)

I am also facing problem in An-isotropic thermal conductivity case setup. I have considered a very simple case, Volumetric heat generation inside a small cube, which is placed in the air region. I started first case with same thermal conductivity in all the three direction and it should give uniform temperature on each 6 faces of the cube. But, Result shows non uniform temperature distribution on the faces, which is incorrect (Variation is negligible, it maybe computation error or case setup error). I have also attached Case setup and final result T plot. Please suggest something.

Case Link
https://drive.google.com/file/d/1WGC...ew?usp=sharing

https://www.dropbox.com/s/nq25yrmn3r..._Cube.zip?dl=0

Regards,
Saurav Kumar

Hello Saurav,

unfortunately your case setup is missing from your post.

Quote:

Originally Posted by xerox (Post 819637)

Hello Saurav,

unfortunately your case setup is missing from your post.

Hello Xerox,

Sorry for the inconvenience, I have added the case links. Please check and let me know my mistakes in case setup.

Regards,
Saurav Kumar