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How to use y_ as dimensionless argument?

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Old   February 19, 2016, 16:41
Default How to use y_ as dimensionless argument?
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I want to extend the function to calculate nut_ by multiplication with 0.1*tanh(pow((0.003*y_),6)).

nut_ = ((existing function)*(0.1*tanh(pow((0.003*y_),6))));

Compilation works fine but when I use the new turbulence model, I get an error:
[0] Argument of trancendental function not dimensionless
[0] From function trans(const dimensionSet&)
[0] in file dimensionSet/dimensionSet.C at line 430.
FOAM parallel run aborting

I assume y_ is not a dimensionless argument for tanh().

How can I deal with that?

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Old   February 19, 2016, 16:53
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Alexey Matveichev
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You can do something like:

dimensionedScalar unitY_("y_", y_.dimensions(), 1.0);

nut_ = ((existing function)*(0.1*tanh(pow((0.003*y_/unitY_),6))));
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Old   February 23, 2016, 06:09
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Joachim Herb
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Have you tried y_.value()?
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