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/*------------------------------------------------------------------------
 * Copyright (C) 2015 For the list of authors, see file AUTHORS.
 *
 * This file is part of IFOS3D.
 * 
 * IFOS3D 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, version 2.0 of the License only.
 * 
 * IFOS3D 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 IFOS3D. See file COPYING and/or 
 * <http://www.gnu.org/licenses/gpl-2.0.html>.
--------------------------------------------------------------------------*/

/* -----------------------------------------------------------------------
 *  generation of an elastic or viscoelastic model specified by vp, vs and rho
 -------------------------------------------------------------------------*/


#include "fd.h"

void model(float  ***  rho, float ***  pi, float ***  u, 
float ***  taus, float ***  taup, float *  eta){

	/*--------------------------------------------------------------------------*/
	/* extern variables */

	extern float DT, *FL, TAU;
	extern int NX, NY, NZ, NXG, NYG, NZG, POS[4], L, MYID;
	extern FILE *FP;
	/* local variables */
	float muv, piv, ws;
	float Vp, Vs, Rho;
	float *pts=NULL, ts=0.0, tp=0.0, sumu, sumpi;
	int i, j, k, l, ii, jj, kk;

	/* parameters for layer 1 */
	const float vp1=6400.0, vs1=4100.0, rho1=2800.0;
	const float vp2=6400.0, vs2=4100.0, rho2=2800.0;
      /*const float vp2=7000.0, vs2=3900.0, rho2=2800.0;*/

	/*-----------------------------------------------------------------------*/
	sumu=0.0; 
	sumpi=0.0;

	fprintf(FP," start model creation");
	
	 if(L){
		/* vector for maxwellbodies */
		pts=vector(1,L);
		for (l=1;l<=L;l++) {
			pts[l]=1.0/(2.0*PI*FL[l]);
			eta[l]=DT/pts[l];
		}
		ts=TAU;  
		tp=TAU;
		ws=2.0*PI*FL[1];
		for (l=1;l<=L;l++){
			sumu=sumu+((ws*ws*pts[l]*pts[l]*ts)/(1.0+ws*ws*pts[l]*pts[l]));
			sumpi=sumpi+((ws*ws*pts[l]*pts[l]*tp)/(1.0+ws*ws*pts[l]*pts[l]));
		}
	 }

	/* loop over global grid */
	for (k=1;k<=NZG;k++){
		for (i=1;i<=NXG;i++){
			for (j=1;j<=NYG;j++){

				
				Vp=vp1; Vs=vs1; Rho=rho1; 
				
				/*for usability reasons, "z" - as commonly used - denotes the depth (vertical direction),
				  however, internally "y" is used for the vertical coordinate,
				  we simply switch the "y" and "z" coordinate as read in the input file,
				  therefore use the variable "j" to, e.g., calculate/address the vertical coordinate:
				  x=(float)i*DX;
				  y=(float)k*DZ;
				  z=(float)j*DY;*/  				

				muv=Vs*Vs*Rho/(1.0+sumu);
				piv=Vp*Vp*Rho/(1.0+sumpi);

				/* only the PE which belongs to the current global gridpoint 
				  is saving model parameters in his local arrays */
				if ((POS[1]==((i-1)/NX)) && 
				    (POS[2]==((j-1)/NY)) && 
				    (POS[3]==((k-1)/NZ))){
					ii=i-POS[1]*NX;
					jj=j-POS[2]*NY;
					kk=k-POS[3]*NZ;
					if(L){
						taus[jj][ii][kk]=ts;
						taup[jj][ii][kk]=tp;
					}
					u[jj][ii][kk]=muv;
					rho[jj][ii][kk]=Rho;
					pi[jj][ii][kk]=piv;
				}
			}
		}
	}

	for (k=50;k<=80;k++){
		for (i=55;i<=85;i++){
			for (j=50;j<=80;j++){

			/*for (j=(NYG/2+1);j<=NYG;j++){*/

				Vp=0.0; Vs=0.0; Rho=0.0;
				Vp=vp2; Vs=vs2; Rho=rho2; 
				
				/*for usability reasons, "z" - as commonly used - denotes the depth (vertical direction),
				  however, internally "y" is used for the vertical coordinate,
				  we simply switch the "y" and "z" coordinate as read in the input file,
				  therefore use the variable "j" to, e.g., calculate/address the vertical coordinate:
				  x=(float)i*DX;
				  y=(float)k*DZ;
				  z=(float)j*DY;*/  				

				muv=Vs*Vs*Rho/(1.0+sumu);
				piv=Vp*Vp*Rho/(1.0+sumpi);

				/* only the PE which belongs to the current global gridpoint 
				  is saving model parameters in his local arrays */
				if ((POS[1]==((i-1)/NX)) && 
				    (POS[2]==((j-1)/NY)) && 
				    (POS[3]==((k-1)/NZ))){
					ii=i-POS[1]*NX;
					jj=j-POS[2]*NY;
					kk=k-POS[3]*NZ;
					if(L){
						taus[jj][ii][kk]=ts;
						taup[jj][ii][kk]=tp;
					}
					u[jj][ii][kk]=muv;
					rho[jj][ii][kk]=Rho;
					pi[jj][ii][kk]=piv;
				}
			}
			
		}
	}	


	MPI_Barrier(MPI_COMM_WORLD);

         if(L)	free_vector(pts,1,L);
}