/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2016 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/>.

\*---------------------------------------------------------------------------*/

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

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


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //


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


inline Foam::scalar Foam::Stockmayer::Omega11(const scalar Tstar)
{
    constexpr scalar a[6] = { 1.0548, 0.15504, 0.55909, 2.1705, 0.093193, 1.5 };
    return (a[0] * power(Tstar, -a[1]) + power(Tstar + a[2], -a[3]))*f11(Tstar);
}


inline Foam::scalar Foam::Stockmayer::Omega22(const scalar Tstar)
{
    constexpr scalar b[6] = { 1.0413, 0.11930, 0.43628, 1.6041, 0.095661, 2.0 };
    return (b[0] * power(Tstar, -b[1]) + power(Tstar + b[2], -b[3]))*f22(Tstar);
}


inline Foam::scalar Foam::Stockmayer::f11(const scalar Tstar)
{
    constexpr scalar a[6] = { 1.0548, 0.15504, 0.55909, 2.1705, 0.093193, 1.5 };
    return 1.0 + sqr(deltaij_)*(expon(a[4]/Tstar)-expon(-a[5]/Tstar))/(2 + 2.5*deltaij_);
}


inline Foam::scalar Foam::Stockmayer::f22(const scalar Tstar)
{
    constexpr scalar b[6] = { 1.0413, 0.11930, 0.43628, 1.6041, 0.095661, 2.0 };
    return 1.0 + sqr(deltaij_)*(expon(b[4]/Tstar)-expon(-b[5]/Tstar))/(2 + 2.5*deltaij_);
}


inline Foam::scalar Foam::Stockmayer::D(const scalar p, const scalar T)
{
    return Interaction::D(Wij_, p, T, (piSigmaSqr_ * Omega11(T/eij_)));
}


inline Foam::scalar Foam::Stockmayer::mu(const scalar p, const scalar T)
{
    return Interaction::mu(2.0*Wij_, T, (piSigmaSqr_ * Omega22(T/eij_)));
}


// * * * * * * * * * * * * * * * Member Operators  * * * * * * * * * * * * * //


// * * * * * * * * * * * * * * * Friend Functions  * * * * * * * * * * * * * //


// * * * * * * * * * * * * * * * Friend Operators  * * * * * * * * * * * * * //


// * * * * * * * * * * * * * * IOstream Operators  * * * * * * * * * * * * * //


// * * * * * * * * * * * * * * * Ostream Operator  * * * * * * * * * * * * * //


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


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