[bharadwaz]

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

[Tobi]

To make a clear statement, you should provide more information -> How to give enough info to get help

[bharadwaz]

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

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

[Z.Q. Niu]

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

[bharadwaz]

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

[suroy2005]

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

[Tobi]

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.

[xerox]

Originally Posted by suroy2005

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:


thermal conductivity --> anisotropic material


With the added entry

alphaAni        Anialpha;

your example is working.

[srv537]

Originally Posted by Tobi

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.

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

[xerox]

Hello Saurav,

unfortunately your case setup is missing from your post.

[srv537]

Originally Posted by xerox

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