et_rot_diff_global.C

/*
 * Methods for computing global quantities within the class Et_rot_diff
 *
 * (see file et_rot_diff.h for documentation)
 */

/*
 *   Copyright (c) 2001 Eric Gourgoulhon
 *
 *   This file is part of LORENE.
 *
 *   LORENE 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 2 of the License, or
 *   (at your option) any later version.
 *
 *   LORENE 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 LORENE; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


char et_rot_diff_global_C[] = "$Header: /cvsroot/Lorene/C++/Source/Etoile/et_rot_diff_global.C,v 1.2 2003/12/19 16:21:42 j_novak Exp $" ;

/*
 * $Id: et_rot_diff_global.C,v 1.2 2003/12/19 16:21:42 j_novak Exp $
 * $Log: et_rot_diff_global.C,v $
 * Revision 1.2  2003/12/19 16:21:42  j_novak
 * Shadow hunt
 *
 * Revision 1.1.1.1  2001/11/20 15:19:28  e_gourgoulhon
 * LORENE
 *
 * Revision 1.2  2001/10/24  16:06:53  eric
 * fonction tsw(): correction erreur ener. cin. (facteur 0.5).
 *
 * Revision 1.1  2001/10/19  08:18:30  eric
 * Initial revision
 *
 *
 * $Header: /cvsroot/Lorene/C++/Source/Etoile/et_rot_diff_global.C,v 1.2 2003/12/19 16:21:42 j_novak Exp $
 *
 */

// Headers C
#include <math.h>

// Headers Lorene
#include "et_rot_diff.h"
            //----------------------------//
            //       T/W          //
            //----------------------------//

double Et_rot_diff::tsw() const {

    if (p_tsw == 0x0) {    // a new computation is required
    
    Cmp dens = uuu() ; 

    dens.mult_r() ;         //  Multiplication by
    dens.va = (dens.va).mult_st() ; //    r sin(theta)

    if (relativistic) {
        dens = omega_field() * a_car() * b_car() * (ener_euler() + press()) 
            * dens ; 
    }
    else {    // Newtonian case 
        dens = omega_field() * nbar() * dens ; 
    }

    dens.std_base_scal() ; 

    double tcin = 0.5 * dens.integrale() ;
    
    if (relativistic) {
        
        Cmp dens2 = a_car() * bbb() * gam_euler() * ener() ;
        dens2.std_base_scal() ; 
        double mass_p = dens2.integrale() ; 
        
        p_tsw = new double( tcin / ( mass_p + tcin - mass_g() ) ) ;     
       
    }
    else {      // Newtonian case 
        Cmp dens2 = 0.5 * nbar() * logn() ;
        dens2.std_base_scal() ; 
        double wgrav = dens2.integrale() ; 
        p_tsw = new double( tcin / fabs(wgrav) ) ;  
    }


    }
    
    return *p_tsw ; 

}

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