/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     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/>.

Global
    compressibleCourantNo

Description
    Calculates the mean and maximum wave speed based Courant Numbers.

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

scalar CoNum = 0.0;
scalar meanCoNum = 0.0;

if (mesh.nInternalFaces())
{
    surfaceScalarField amaxSfbyDelta =
        mesh.surfaceInterpolation::deltaCoeffs()*amaxSf;

    CoNum = max(amaxSfbyDelta/mesh.magSf()).value()*runTime.deltaT().value();

    meanCoNum =
        (sum(amaxSfbyDelta)/sum(mesh.magSf())).value()
       *runTime.deltaT().value();
}

Info<< "Mean and max Courant Numbers = "
    << meanCoNum << " " << CoNum << endl;

// ************************ vim: set sw=4 sts=4 et: ************************ //
