[Datsusong]

Hi,
I am new on the forum and I will introduce myself.
My name is Aurélien and I am french student working in London in engineers building domain.
I work on dissertation. I want to have visualisation of air ventilation in a room with openfoam tool. The goal is to improve placement of supply and extract.

-First step was to create geometry of a room. This step is done. I've had some difficulties but it's OK. So BlockMeshDict file is correct and I can open on Paraview.

-I defined a air flowrate for output and velocity for input but I can't see any evolution on paraview.

-I use buoyantBoussinesqSimpleFoam solver. Is it the right one for air ventilation ?

-What kind of inout I missed ? I mean, basicly what kind of input we nee to run a simple air flow ?

I will send my files this week end
Thanks for reading me and sorry for my bad english ^^
Aurélien

[tian]

Hi,

buoyantBoussinesqSimpleFoam is ok for this case. All other questions need to wait for your case.

Bye
Thomas

[Datsusong]

Originally Posted by tian

Hi,

buoyantBoussinesqSimpleFoam is ok for this case. All other questions need to wait for your case.

Bye
Thomas

Hi, thanks for your reply

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: plus |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

vertices
(
(0 0 0)
(2.2 0 0)
(2.2 3 0)
(0 3 0)
(0 0 1.1)
(2.2 0 1.1)
(2.2 3 1.1)
(0 3 1.1)
(5.3 0 0)
(5.3 3 0)
(2.2 0 4.7)
(5.3 0 4.7)
(5.3 3 4.7)
(2.2 3 4.7)
(8.1 0 0)
(8.1 3 0)
(5.3 0 2.8)
(8.1 0 2.8)
(8.1 3 2.8)
(5.3 3 2.8)
(2.2 2.98 -0.1)
(5.3 2.98 -0.1)
(5.3 3 -0.1)
(2.2 3 -0.1)
(2.2 2.98 0)
(5.3 2.98 0)
(2.2 3 2.8)
(5.3 3.1 2.8)
(2.2 3.1 2.8)
(5.3 3.1 4.7)
(2.2 3.1 4.7)
);

blocks
(
hex (0 1 2 3 4 5 6 7) (50 50 50) simpleGrading (1 1 1)
hex (1 8 9 2 10 11 12 13) (50 50 50) simpleGrading (1 1 1)
hex (8 14 15 9 16 17 18 19) (50 50 50) simpleGrading (1 1 1)
hex (20 21 22 23 24 25 9 2) (10 10 1) simpleGrading (1 1 1)
hex (26 19 27 28 13 12 29 30) (50 50 50) simpleGrading (1 1 1)
);

edges
(
);

boundary

(
fixedWalls
{
type wall;
faces
(
(0 3 2 1)
(3 7 6 2)
(4 5 6 7)
(0 1 5 4)
(1 2 9 8)
(2 13 12 9)
(10 11 12 13)
(1 8 11 10)
(1 10 13 2)
(8 9 12 11)
(8 9 15 14)
(16 17 18 19)
(8 14 17 16)
(15 9 19 18)
(2 23 20 24)
(2 9 22 23)
(25 21 22 9)
(24 20 21 25)
(13 26 19 12)
(13 12 29 30)
(29 12 19 27)
(28 27 19 26)
(28 26 13 30)
);
}
supply
{
type inletOutlet;
faces
(
(20 21 22 23)
);
}
extract
{
type inletOutlet;
faces
(
(28 30 29 27)
);
}
);
mergePatchPairs
(
);


// ************************************************** *********************** //

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: plus |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0 0 0);

boundaryField
{
supply
{
type flowRateOutletVelocity;
volumetricFlowRate 0.5;
value uniform (0 0 0);
}

extract
{
type flowRateOutletVelocity;
volumetricFlowRate 0.2;
value uniform (0 0 0);
}

fixedWalls
{
type noSlip;
}
defaultFaces
{
type calculated;
}
}

// ************************************************** *********************** //

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: plus |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 2 -2 0 0 0 0];

internalField uniform 0;

boundaryField
{
supply
{
type calculated;
value $internalField;
}

extract
{
type calculated;
value $internalField;
}

fixedWalls
{
type calculated;
value $internalField;
}
defaultFaces
{
type calculated;
value $internalField;
}
}

// ************************************************** *********************** //

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: plus |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p_rgh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 2 -2 0 0 0 0];

internalField uniform 0;

boundaryField
{
supply
{
type calculated;
rho rhok;
value $internalField;
}

extract
{
type fixedFluxPressure;
rho rhok;
value uniform 30;
}

fixedWalls
{
type fixedFluxPressure;
rho rhok;
value uniform 0;
}
defaultFaces
{
type fixedFluxPressure;
rho rhok;
value uniform 0;
}
}

// ************************************************** *********************** //

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: plus |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object T;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 0 0 1 0 0 0];

internalField uniform 300;

boundaryField
{
supply
{
type fixedValue;
value uniform 280;
}
extract
{ type calculated;
value $internalField;
}
fixedWalls
{
type fixedValue;
value uniform 300;
}
defaultFaces
{ type calculated;
value $internalField;
}
}

// ************************************************** *********************** //

here are my files for run a simulation alpha epsilon nut and k stay constant. To have a good vision I add a picture of the room on paraview.
https://imgur.com/vOyHfNi

What input I missed ? perhaps my exploitation data on paraview is not good to have visualisation ?

Thanks
Have a good day
Aurélien

[tian]

Hi,

your blockMesh looks not ok. It seems you created internal walls which will block your fluid. Also the cells size and number is also terrible.

https://postimg.cc/image/o3lhcj2dp/

https://postimg.cc/image/5b9m94t6l/

Bye
Thomas

[Datsusong]

Hi,

Thanks for your help !!
ohhhh yes internal walls, I suppose I have to add empty boundary for internal walls ?

Because in my BlockMeshDict I have written mergePatchPairs and I thought it was ok for face between blocks.

Yeah I know that cells size is terrible but I will adjust after a first run.

Bye
Aurélien

[Datsusong]

Hi,
I think I understand my mistake for mesh !

In my case a part of a face in a block have two functions and it's impossible I have to create new blocks.
I add pictures to explain. In the first photo there are 2 blocks.
https://imgur.com/kOz6dtB

but if I want to have a part of wall as empty and other part as wall I have to create the third block or not ?
https://imgur.com/T8QpIrP

Aurélien