[magga]

Hi everyone,

I am trying to set a scalar field T, depending on the value of another scalar field alpha.
I would like T to be zero when alpha<=0.5, and T=1 when alpha>=0.5.
I wanted to use setFields, and select the region to be modified with fieldToCell, however I can't manage to do that .... I don't really know what to write it the setFieldsDict, as most of the examples I found on the wed use boxToCell.
Here is what I tried :

defaultFieldValues
(
volScalarFieldValue T 0
);

regions
(
fieldToCell
{
field alpha;
min 0;
max 0.5;
(
volScalarFieldValue T 1
);
}
);

And I receive an error message saying
"attempt to read beyond EOF".

Does anyone knows what it means and how I could fix it ?
Thank you very much for any help !

[alexeym]

Hi,

Not sure this is the reason but the dictionary of fieldToCell is (taken from topoSetDict example)

source fieldToCell;
sourceInfo
{
    fieldName   U;      // Note: uses mag(U) since volVectorField
    min         0.1;
    max         0.5;
}

while you use just "field" label for alpha. Have you tried

fieldToCell
{
    fieldName alpha;
    min 0;
    max 0.5;

    (
        volScalarFieldValue T 1
    );
}

[magga]

Hi,
Indeed this was half on the error, I had also forgotten the 'fieldValue', before the definition of T=1.
Thank very much you for your help alexeym! (and the link towards toposetdict example)

[alexeym]

Hi,

Can you, please, share the example of correct syntax of setFieldsDict entry for reference?

[magga]

sure, here is the code that works

defaultFieldValues
(
    volScalarFieldValue T 0
);

regions
(
    fieldToCell
    {
        fieldName alpha;
		min 0;
		max 0.5;
		fieldValues
        (
            volScalarFieldValue T 0 1
        );
    }
);