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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2017-2026 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "Square.H"
#include "mathematicalConstants.H"
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
template<class Type>
inline Type Foam::Function1s::Square<Type>::value(const scalar x) const
{
const scalar phi = frequency_*(x - start_);
const scalar fraction = phi - floor(phi);
return
amplitude_->value(x)*(fraction < dutyCycle_ ? 1 : -1)
+ level_->value(x);
}
template<class Type>
inline Type Foam::Function1s::Square<Type>::derivative(const scalar x) const
{
return pTraits<Type>::zero;
}
template<class Type>
inline Type Foam::Function1s::Square<Type>::integral
(
const scalar x1,
const scalar x2
) const
{
if (!integrable_)
{
FatalErrorInFunction
<< "Integration is not defined for " << type() << " functions "
<< "unless the amplitude is constant"
<< exit(FatalError);
}
auto integral0 = [&](const scalar x)
{
const scalar phi = frequency_*(x - start_);
const scalar fraction = phi - floor(phi);
return
(2*amplitude_->value(x)/frequency_)
*(
dutyCycle_*floor(phi + 1 - dutyCycle_)
+ fraction*(fraction < dutyCycle_ ? 1 : 0)
- frequency_/2*x
);
};
return integral0(x2) - integral0(x1) + level_->integral(x1, x2);
}
// ************************************************************************* //
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