[Panagioto]

Hi everybody!
How do I make the list for
internalField nonuniform <List>;? this is for the 0/pd directory in interFoam

[tsikroria0]

Even I want to implement nonuniform internal fiels for pressure... Can anyone tell me how the cell numbering is set in OpenFOAM?

[mu.e.nash]

Originally Posted by tsikroria0

Even I want to implement nonuniform internal fiels for pressure... Can anyone tell me how the cell numbering is set in OpenFOAM?

hi all,
the numbering begin in x-direction then y-direction then z-direction
eg.
//loop for changing z
for(int i=0;i<NocellsZ;i++)
{//loop for changing y
for(int j=0;j<NocellsY;j++)
{//loop for changing x
for(int k=0;k<NocellsX;k++)
{
//put the value here
}
}
}

[gschaider]

Originally Posted by mu.e.nash

hi all,
the numbering begin in x-direction then y-direction then z-direction
eg.
//loop for changing z
for(int i=0;i<NocellsZ;i++)
{//loop for changing y
for(int j=0;j<NocellsY;j++)
{//loop for changing x
for(int k=0;k<NocellsX;k++)
{
//put the value here
}
}
}

I'm afraid: No. This would work for only a blockMesh with one block (and even there OpenFOAM wouldn't voluntarily give you the NocellsX/Y/Z (it doesn'T know it as this kind of information doesn't make sense for a polyhedral mesh)

@tsikroria0: if you WANT to program it in C++ have a look how utilities like engineSwirl and setFields do it. If you just want to set the field and go on: search for funkySetFields

[mu.e.nash]

yes i have tried my code on one block, but i made a c++ program outside OpenFoam to read the output of blockMesh and assign the value of my internal field to the centers of cells by changing the files in "0" directory by using:
internalField nonuniform List<scalar>
'No.ofOverallCells'
(
//data entered here
)
;

if there is another way to doing so for multiple blocks please tell me that way.

[gschaider]

Originally Posted by mu.e.nash

yes i have tried my code on one block, but i made a c++ program outside OpenFoam to read the output of blockMesh and assign the value of my internal field to the centers of cells by changing the files in "0" directory by using:
internalField nonuniform List<scalar>
'No.ofOverallCells'
(
//data entered here
)
;

if there is another way to doing so for multiple blocks please tell me that way.

Your previous example worked for one block because blockMesh HAPPENS to number cells that way. The pricinciple is extendible for more than one block, but be warned that this might break at any time (if the implementation of blockMesh changes)

For the general case if you don't want to do use the OpenFOAM-API your best guess is to let an OF-program write out the cell centers of the mesh and your program reads that in and acts accordingly

[mu.e.nash]

how is that???

[gschaider]

Originally Posted by mu.e.nash

how is that???

Because OpenFOAM is a code for general polyhdra (I think I invested more time in this vacuous (but correct) answer than you did in the formulation of your question)

[heksel8i]

Hey!

I would like to have a nonuniform initial condition. I have a arbitrary boundary and I know the flow values in the boundary cells/faces. Apparently I could use interiorfield: nonuniform and give the values as a list (x,y,z,value). But because I want to start the simulation with these values and the mesh is not created by blockmesh, I have no idea about the order of the list-values in nonuniform condition.

I tried to check but swak4foam and setFields seem to be for analytical expressions but I want to work with a truly existing list?

Any ideas?

[gschaider]

Originally Posted by heksel8i

Hey!

I would like to have a nonuniform initial condition. I have a arbitrary boundary and I know the flow values in the boundary cells/faces. Apparently I could use interiorfield: nonuniform and give the values as a list (x,y,z,value). But because I want to start the simulation with these values and the mesh is not created by blockmesh, I have no idea about the order of the list-values in nonuniform condition.

I tried to check but swak4foam and setFields seem to be for analytical expressions but I want to work with a truly existing list?

Any ideas?

Try timeVaryingMappedFixedValue

[ZhoujiangZho]

Dear Bernhard,
Now I want to input nonuniform values(scalar a) in internal field which has a relation with y coordinate:
scalar a = k*y + b;
How can I do that?
Zhoujiang

[acs]

Originally Posted by ZhoujiangZho

Dear Bernhard,
Now I want to input nonuniform values(scalar a) in internal field which has a relation with y coordinate:
scalar a = k*y + b;
How can I do that?
Zhoujiang

Hi, Zhoujiang,

Maybe it's too late for you but I've just found and tested this tool: swak4foam. You must follow the installation instructions for attending all the requirements.

An example:

expressions
(
alpha1expr1
{
field alpha1; //field to initialise
expression "0.8";
condition "(pos().x<0.0)";
keepPatches 1; //keep the boundary conditions that were set before
}
alpha1expr2
{
field alpha1;
expression "0.8+100*pos().x";
condition "(pos().x>=0.0) && (pos().x<=0.001)";
keepPatches 1;
}
alpha1expr3
{
field alpha1;
expression "0.9";
condition "pos().x>0.001";
keepPatches 1;

}
);

[UKARUN]

can anyone say what is the meaning of this internalField nonuniform? What is the meaning of the numbers 0....., 1....... and so on? What to do if i want to use uniform conditions?

FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object alpha.water;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 0 0 0 0 0 0];

internalField nonuniform List<scalar>
1875
(
1
1
1
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)
;

boundaryField
{
inlet
{
type fixedValue;
value uniform 0.5;
}
outlet
{
type inletOutlet;
phi phi.water;
inletValue uniform 0;
value uniform 0;
}
walls
{
type zeroGradient;
}
defaultFaces
{
type empty;
}
}


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

[UKARUN]

Hello all, I wanted to change geometry of the bubble column in multiphaseEulerFoam file into a T-junction channel. I changed the conditions in the blockMeshDict. But the contents of the alpha.water and alpha.water is difficult to understand. Can anyone say what is the meaning of this internalField nonuniform? What is the meaning of the numbers 0....., 1....... and so on? What to do if i want to use uniform conditions?

FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object alpha.water;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 0 0 0 0 0 0];

internalField nonuniform List<scalar>
1875
(
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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;

boundaryField
{
inlet
{
type fixedValue;
value uniform 0.5;
}
outlet
{
type inletOutlet;
phi phi.water;
inletValue uniform 0;
value uniform 0;
}
walls
{
type zeroGradient;
}
defaultFaces
{
type empty;
}
}


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

[gschaider]

RTFM https://cfd.direct/openfoam/user-gui...17-1310004.2.8

Originally Posted by UKARUN

Hello all, I wanted to change geometry of the bubble column in multiphaseEulerFoam file into a T-junction channel. I changed the conditions in the blockMeshDict. But the contents of the alpha.water and alpha.water is difficult to understand. Can anyone say what is the meaning of this internalField nonuniform? What is the meaning of the numbers 0....., 1....... and so on? What to do if i want to use uniform conditions?

FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object alpha.water;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 0 0 0 0 0 0];

internalField nonuniform List<scalar>
1875
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1
1