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Using trig/hyperbolic functions with dimensioned scalars

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Old   April 20, 2013, 22:16
Default Using trig/hyperbolic functions with dimensioned scalars
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Chris Prohoda
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I'm trying to compute the cosh and sinh of a dimensionedScalar, and it won't accept the arguments. Here is my code:

Code:
forAll(M,celli){
Argument = fitParameter*H[celli].x()/T[celli];
M[celli].x()=Msat*(cosh(Argument)/sinh(Argument));
}
"Argument" is a dimensioned scalar, and "M" is a volVectorField. I get the error "cannot convert 'Foam::dimensioned<double>' to 'double' in assignment" on the second line of code.

Two questions:
(1) Is there a way to perform cosh et al on a vector or field? From the documentation, it looks like it only accepts scalars, but I'm not sure.

(2) How can I solve the issue? Argument.value() doesn't seem to work, and using a const dimensionedScalar doesn't make sense with my problem.

I really appreciate your help. Thanks!
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Old   April 21, 2013, 03:37
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Lieven
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It is not allowed to compute the cosh or sinh of a dimensioned numer. Just this about it, what would be the meaning of
Code:
scalar cosFive = cos(5 m/s)
cosh or sinh are no exception for this.

For your case, you could use
Code:
 cosh(Argument.value())/sinh(Argument.value())
to solve this.

Cheers,

L
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Old   April 21, 2013, 14:35
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Chris Prohoda
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Quote:
Originally Posted by Lieven View Post
It is not allowed to compute the cosh or sinh of a dimensioned numer. Just this about it, what would be the meaning of
Code:
scalar cosFive = cos(5 m/s)
cosh or sinh are no exception for this.

For your case, you could use
Code:
 cosh(Argument.value())/sinh(Argument.value())
to solve this.

Cheers,

L
Thank you for your suggestion. However, when I try using Argument.value(), I get this error: "overloaded function cosh(double&) is ambiguous. Candidates are double cosh(double)."

What does the "double&" mean, and does anyone have any suggestions for how to solve this?
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Old   April 21, 2013, 16:55
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Lieven
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Ok, try adding 'Foam::' :
Code:
Foam::cosh(Argument.value())/Foam::sinh(Argument.value())
Cheers,

L
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Old   April 21, 2013, 18:27
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Chris Prohoda
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That worked! Thank you, Lieven
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