halfCosineRampI.H

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#include "halfCosineRamp.H"
#include "mathematicalConstants.H"

// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

inline Foam::scalar Foam::Function1s::halfCosineRamp::value
(
    const scalar t
) const
{
    return 0.5*(1 - cos(constant::mathematical::pi*linearRamp(t)));
}


inline Foam::scalar Foam::Function1s::halfCosineRamp::integral
(
    const scalar t1,
    const scalar t2
) const
{
    using namespace constant::mathematical;

    const scalar l1 = linearRamp(t1), l2 = linearRamp(t2);

    return
        0.5*(l2 - l1 - (sin(pi*l2) - sin(pi*l1))/pi)/dLinearRampDt()
      + (t2 - min(t2, end()));
}


// ************************************************************************* //