[r2d2]

Dear All,
What would be the syntax of funkySetFields to set a value of a field only on a part of a cellZone of my mesh?
This does not work:

expressions
(

setProp1
{
field alpha;
zoneName pipe;
condition " (pos().y < -0.331)";
expression "1";
keepPatches true;
}

);

Many thanks in advance...

[gschaider]

Originally Posted by r2d2

Dear All,
What would be the syntax of funkySetFields to set a value of a field only on a part of a cellZone of my mesh?
This does not work:

expressions
(

setProp1
{
field alpha;
zoneName pipe;
condition " (pos().y < -0.331)";
expression "1";
keepPatches true;
}

);

Many thanks in advance...

This is documented in the incomplete reference guide that comes with the sources and on the original funkySetFields-page (I point this out because it is my impression that the fact that there IS documentation seems to confuse people): you're looking for the zone-function. Your condition would be (if I interpret it correctly) "zone(pipe) && (pos().y<-0.331)"

[r2d2]

Dear Bernhard,
My fault for being a bit lazy...actually I found it while you gave me the solution.
Many thanks,
radu

[saumavadey]

Hello!

I was trying to set the field for a volTensorField for a particular cellzone the following way:

roughness_channel1
{
field nRGHo;
zone(channel1);
expression "tensor(0.15, 0.0, 0.0, 0.0, 0.15, 0.0, 0.0, 0.0, 0.0)";
keepPatches 1;
}

But it doesn't work. The field for the entire domain gets replaced by the given tensor value. Can anyone explain why is it happening?

[gschaider]

Originally Posted by saumavadey

Hello!

I was trying to set the field for a volTensorField for a particular cellzone the following way:

roughness_channel1
{
field nRGHo;
zone(channel1);
expression "tensor(0.15, 0.0, 0.0, 0.0, 0.15, 0.0, 0.0, 0.0, 0.0)";
keepPatches 1;
}

But it doesn't work. The field for the entire domain gets replaced by the given tensor value. Can anyone explain why is it happening?

To constrain the cells the cells that FSF manipulates you've got to use a "condition" (it is a bit more typing but sooo much more flexible). The condition can be any expression with a boolean result. In your case something like

roughness_channel1
    {
        field nRGHo;
        condition "zone(channel1)";
        expression "tensor(0.15, 0.0, 0.0, 0.0, 0.15, 0.0, 0.0, 0.0, 0.0)";
        keepPatches 1;
    }

[saumavadey]

Yes! Got it! It works well.... Thanks a lot!