[Wien3]

Good Morning!
I have a simple question (at least I guess) that I'm sure you can solve.
I'm using the chtMultiRegionSimpleFoam in order to create a model which consists in a little cube which has heat transfer which my fluid (everything inside a pipe of 5x2x2).
I took planeWall2D as a model, and I achieved to draw it in 2D, but not in 3D model.
The problem is that I don't get a cube of 0.4L, I get a prism of 0.4x0.4x2 (so OpenFoam doesn't take care about Z dimensions). This is my topoSetDict file:

PHP Code:

actions
(
    // fluid
    {
        name    fluid;
        type    cellSet;
        action  new;
        source  boxToCell;
        sourceInfo
        {
            box (0 0 0 )(5 0.8 2);  //1°floor
        }
    }
    {
        name    fluid;
        type    cellSet;
        action  add;
        source  boxToCell;
        sourceInfo
        {
            box (0 0.8 0 )(5 1.2 0.8);  //2°floor front
        }
    }
    {
        name    fluid;
        type    cellSet;
        action  add;
        source  boxToCell;
        sourceInfo
        {
            box (0 0.8 0.8)(2.3 1.2 1.2); //2°floor inlet
        }
    }
    {
        name    fluid;
        type    cellSet;
        action  add;
        source  boxToCell;
        sourceInfo
        {
            box (2.7 0.8 0.8 )(5 1.2 1.2); //2°floor outlet
        }
    }
    {
        name    fluid;
        type    cellSet;
        action  add;
        source  boxToCell;
        sourceInfo
        {
            box (0 0.8 1.2 )(5 1.2 2);  //2°floor back
        }
    }
    {
        name    fluid;
        type    cellSet;
        action  add;
        source  boxToCell;
        sourceInfo
        {
            box (0 1.2 0 )(5 2 2);    //3°floor
        }
    }
    {
        name    fluid;
        type    cellZoneSet;
        action  new;
        source  setToCellZone;
        sourceInfo
        {
            set fluid;
        }
    }

    // cube
    {
        name    cube;
        type    cellSet;
        action  new;
        source  boxToCell;
        sourceInfo
        {
            box (2.3 0.8 0.8 )(2.7 1.2 1.2);
        }
    }
    {
        name    cube;
        type    cellZoneSet;
        action  new;
        source  setToCellZone;
        sourceInfo
        {
            set cube;
        }
    }
); 


I also studied the MultiRegionHeaterRadiation and I tried also with this one:

PHP Code:

actions
(


    // cube
    {
        name    cube;
        type    cellSet;
        action  new;
        source  boxToCell;
        sourceInfo
        {
            box (2.3 0.8 0.8 )(2.7 1.2 1.2);
        }
    }
    {
        name    cube;
        type    cellZoneSet;
        action  new;
        source  setToCellZone;
        sourceInfo
        {
            set cube;
        }
    }
    // fluid
    {
        name    fluid;
        type    cellZoneSet;
        action  clear;
    }
    {
        name    fluid;
        type    cellSet;
        action  add;
        source  cellToCell;
        sourceInfo
        {
            set cube;
        }
    }
    {
        name    fluid;
        type    cellSet;
        action  invert;
    }
    {
        name    fluid;
        type    cellZoneSet;
        action  new;
        source  setToCellZone;
        sourceInfo
        {
            set fluid;
        }
    }
); 


With this one I get the same result (you can see in the image). At first I thought that maybe this solver don't work with 3D, but after studying the second case I'm sure it is not that.

I attach my complete case folder, maybe the failure is there.

Thank you in advance!

[Wien3]

I solved it!
It was enough to add the front and back face as "symmetry plane", and for having 3D mesh, change z component in the hexaedron in blockMesh (if it is input a "1" error are produced in front and back faces)

I hope it can help somebody!

[salvo-K61IC]

Hi all guys,

i am trying to simulate a static sphere (hot sphere) in a fluid (cold fluid) which transfers heat by difference of temperature.I created the mesh with salome and i have two regions:

fluidRegion (air) , solidRegion (sphere)

My goal is to get a convergence with HeatFlux (computed by using the tool wallHeatFlux available in OF2.3.X) increasing the cells of the mesh.

I started playing with planeWall2D as a model, but when i started using these kind of problems i do not get any convergence with wall flux.



here i enclose the folder 0 to check BC ( i am not sure about them)! , could someone please help me with this case??

i am trying making different changes but i do not get a right heat flux between both regions, even if residuals go below than 10^-5.

I ll really appreciate, thank you very much in advance!!

P.S. I use OpenFoam 2.3.x and salome 6.6.0 to create meshes