/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2017-     Statoil ASA
// 
//  ResInsight 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.
// 
//  ResInsight 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 at <http://www.gnu.org/licenses/gpl.html> 
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#pragma once


class RigTransmissibilityEquations
{
public:

    // Calculations are assuming an orthogonal coordinate system

    // If using wellBoreTransmissibilityComponent to calculate Tx (transmissibility in x direction), 
    // perforationVectorComponent is the x component (in the cell local coordinate system) of the perforation vector
    // permeability and cell size for Z and Y are to be specified as "normal directions" 1 and 2
    // but normal directions 1 and 2 are interchangeable (so Z=1, Y=2 and Z=2, Y=1 gives same result)

    static double               peacemanRadius(double permeabilityNormalDirection1,
                                               double permeabilityNormalDirection2,
                                               double cellSizeNormalDirection1,
                                               double cellSizeNormalDirection2);

    static double               wellBoreTransmissibilityComponent(double cellPerforationVectorComponent, 
                                                                  double permeabilityNormalDirection1,
                                                                  double permeabilityNormalDirection2,
                                                                  double cellSizeNormalDirection1,
                                                                  double cellSizeNormalDirection2,
                                                                  double wellRadius, 
                                                                  double skinFactor, 
                                                                  double cDarcyForRelevantUnit);

    static double               totalConnectionFactor(double transX,
                                                      double transY,
                                                      double transZ);

};