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How to compare volume scalar field with constant values

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Old   November 24, 2009, 13:59
Default How to compare volume scalar field with constant values
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Sachin Kanetkar
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Hi,
I wanted to compare one volscalarfield w.r.t a constant value
To be more precise if I want to compare enthalpy h with specific value say enthalpy of sat liq
i need to find in all h values i.e forAll(arg1,arg2)
what should these arguments be

Please do let me know

thanks
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Old   November 24, 2009, 14:05
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Laurence R. McGlashan
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Something like:

Code:
forAll(enthalpy,celli)
{
    if(enthalpy[celli] == satEnthalpy){}
    else{}
}
Sounds like you know how to do it already if you've found the forAll macro.
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Old   November 24, 2009, 14:07
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Sachin Kanetkar
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thanks for your quick reply,
I was having a basic idea...was just missing the arguments
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Old   November 24, 2009, 14:09
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Laurence R. McGlashan
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That's probably a bit sloppy for a volScalarField.

Code:
forAll(enthalpy.internalField(),celli)
{
         if(enthalpy[celli] == satEnthalpy){}
         else{}
}
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Old   April 11, 2019, 04:34
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Anna
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Hi there!

I'm trying to compare one volScalarField with one scalar, but It doesn't work properly.

I've used the code posted in previous post but it doesn´t get correct values. My code is:

Quote:
forAll(myVolScalarField.internalField(), i)
{

if (myVolScalarField[i] < scalar(1.0))
{

te.ref() = myVolScalarField * (dimensionedScalar("s", dimensionSet(0,0,1,0,0,0,0), scalar(1.0)));

}
else
{
te.ref() = 100 * (dimensionedScalar("s", dimensionSet(0,0,1,0,0,0,0), scalar(1.0)));
}

}
I'm not getting error, but when I analize the results, I'm not gettig what i spect. It seems like it doesn't compare cell by cell, it gets for all the vector the first equation or the second, but not both in the same timestep. Anyone knows how to fix it? Or how to do a comparation between scalar and volScalarField.

Thanks!
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