snap_ssg.c 6.1 KB
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/*-----------------------------------------------------------------------------------------
 * Copyright (C) 2013  For the list of authors, see file AUTHORS.
 *
 * This file is part of DENISE.
 * 
 * DENISE 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.
 * 
 * DENISE 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 DENISE. See file COPYING and/or <http://www.gnu.org/licenses/gpl-2.0.html>.
-----------------------------------------------------------------------------------------*/

/*------------------------------------------------------------------------
 *   Write 2D snapshot for current timestep  to file                                   
 *   last update 24/05/2002
 *
 *  T. Bohlen
 *  See COPYING file for copying and redistribution conditions.
 *  ----------------------------------------------------------------------*/

#include "fd.h"


void snap(FILE *fp,int nt, int nsnap, float **vx, float **vy, float **sxx,
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	float **syy, float **sp, float **u, float **pi, float *hc, int ishot){
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	/* 
		different data formats of output:
		SNAP_FORMAT=1  :  SU (IEEE)
		SNAP_FORMAT=2  :  ASCII
		SNAP_FORMAT=3  :  BINARY (IEEE)
		
		different types:
		SNAP=1 : values in vx and vy
		SNAP=2 : -(vx+vy) (pressure field)
		SNAP=3 : divergence of vx and vy (energy of compressional waves)
		         and curl of vx and vy (energy of shear waves)
		SNAP=4 : both particle velocities (type=1) and energy (type=3)
		*/


	int i,j, m, fdoh, nd;
	float amp, vyx, vxy, vxx, vyy, dhi;
	float **divfield, **curlfield;
	char snapfile_x[STRING_SIZE], snapfile_y[STRING_SIZE], snapfile_div[STRING_SIZE];
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	char snapfile_rot[STRING_SIZE], snapfile_p[STRING_SIZE], ext[8], wm[2];
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	FILE *fpx1, *fpy1, *fpx2, *fpy2;

	extern float DH, DT;
	extern char SNAP_FILE[STRING_SIZE];
	extern int NX, NY,  SNAP_FORMAT, SNAP, FDORDER, ACOUSTIC;
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	extern int MYID, POS[3], IDX, IDY,VERBOSE;
    
    /* Check if snapshots should be writen for this shot*/
    extern int SNAPSHOT_START, SNAPSHOT_END, SNAPSHOT_INCR;
    int check=0;
    for(i=SNAPSHOT_START;i<=SNAPSHOT_END;i+=SNAPSHOT_INCR) {
        if(ishot==i) check=1;
    }
    if(check==0) return;
    
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	dhi = 1.0/DH;
	fdoh = FDORDER/2;

	switch(SNAP_FORMAT){
	case 1:
		sprintf(ext,".su");
		break;
	case 2:
		sprintf(ext,".asc");
		break;
	case 3:
		sprintf(ext,".bin");
		break;
	}
	
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	sprintf(snapfile_x,"%s%s.x.shot%i.%i.%i",SNAP_FILE,ext,ishot,POS[1],POS[2]);
	sprintf(snapfile_y,"%s%s.y.shot%i.%i.%i",SNAP_FILE,ext,ishot,POS[1],POS[2]);
	sprintf(snapfile_div,"%s%s.div.shot%i.%i.%i",SNAP_FILE,ext,ishot,POS[1],POS[2]);
	sprintf(snapfile_rot,"%s%s.rot.shot%i.%i.%i",SNAP_FILE,ext,ishot,POS[1],POS[2]);
	sprintf(snapfile_p,"%s%s.p.shot%i.%i.%i",SNAP_FILE,ext,ishot,POS[1],POS[2]);
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	if(VERBOSE) fprintf(fp,"\n\n PE %d is writing snapshot-data at T=%fs to \n",MYID,nt*DT);
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	if (nsnap==1)
		sprintf(wm,"w");
	else 
		sprintf(wm,"a");

	switch(SNAP){
	case 1 :
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		if(VERBOSE)fprintf(fp,"%s\n", snapfile_x);
		if(VERBOSE)fprintf(fp,"%s\n\n", snapfile_y);
        fpx1=fopen(snapfile_x,wm);
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		fpy1=fopen(snapfile_y,wm);
		for (i=1;i<=NX;i+=IDX)
			for (j=1;j<=NY;j+=IDY){
				writedsk(fpx1,vx[j][i],SNAP_FORMAT);
				writedsk(fpy1,vy[j][i],SNAP_FORMAT);
			}
		fclose(fpx1);
		fclose(fpy1);
		break;


	case 2 :
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		if(VERBOSE)fprintf(fp,"%s\n\n",snapfile_p);
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		fpx1=fopen(snapfile_p,wm);

		for (i=1;i<=NX;i+=IDX)
			for (j=1;j<=NY;j+=IDY){
				if(!ACOUSTIC)
					amp=-sxx[j][i]-syy[j][i];
				else
					amp=-sp[j][i];
				writedsk(fpx1,amp,SNAP_FORMAT);
			}
		fclose(fpx1);
		break;

	case 4 :
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		if(VERBOSE)fprintf(fp,"%s\n", snapfile_x);
		if(VERBOSE)fprintf(fp,"%s\n", snapfile_y);
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		fpx1=fopen(snapfile_x,wm);
		fpy1=fopen(snapfile_y,wm);
		for (i=1;i<=NX;i+=IDX)
			for (j=1;j<=NY;j+=IDY){
				writedsk(fpx1,vx[j][i],SNAP_FORMAT);
				writedsk(fpy1,vy[j][i],SNAP_FORMAT);
			}
		fclose(fpx1);
		fclose(fpy1);
		
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		if(VERBOSE)fprintf(fp,"%s\n\n",snapfile_p);
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		fpx1=fopen(snapfile_p,wm);

		for (i=1;i<=NX;i+=IDX)
			for (j=1;j<=NY;j+=IDY){
				if(!ACOUSTIC)
					amp=-sxx[j][i]-syy[j][i];
				else
					amp=-sp[j][i];
				writedsk(fpx1,amp,SNAP_FORMAT);
			}
		fclose(fpx1);
	case 3 :
		/* output of the curl of the velocity field according to Dougherty and
				                  Stephen (PAGEOPH, 1988) */
		/*if (NY1<=2) error("NY1 must be greater than 2.");*/
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		if(VERBOSE)fprintf(fp,"%s\n", snapfile_div);
		if(VERBOSE)fprintf(fp,"%s\n\n", snapfile_rot);
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		fpx2=fopen(snapfile_div,wm);
		fpy2=fopen(snapfile_rot,wm);
		
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		nd = FDORDER/2+1;
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		curlfield  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);


		for (i=1;i<=NX;i+=IDX)
			for (j=1;j<=NY;j+=IDY){

				/* spatial derivatives using Holberg coefficients */
				vyx = 0;
				vxy = 0;
				for (m=1; m<=fdoh; m++) {
					vyx += hc[m]*(vy[j][i+m] - vy[j][i-m+1]);
					vxy += hc[m]*(vx[j+m][i] - vx[j-m+1][i]);
				}
				vyx *= dhi;
				vxy *= dhi;
				
				if(!ACOUSTIC)
					curlfield[j][i]=(vxy-vyx)*sqrt(u[j][i]);
				else
					curlfield[j][i]=0;
			}


		for (i=1;i<=NX;i+=IDX)
			for (j=1;j<=NY;j+=IDY){
				writedsk(fpy2,curlfield[j][i],SNAP_FORMAT);
			}
		free_matrix(curlfield,-nd+1,NY+nd,-nd+1,NX+nd);

		/* output of the divergence of the velocity field according to Dougherty and
				                  Stephen (PAGEOPH, 1988) */
		divfield  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
		for (i=1;i<=NX;i+=IDX)
			for (j=1;j<=NY;j+=IDY){

				/* spatial derivatives using Holberg coefficients */
				vxx = 0;
				vyy = 0;
				for (m=1; m<=fdoh; m++) {
					vxx += hc[m]*(vx[j][i+m-1] - vx[j][i-m]  );
					vyy += hc[m]*(vy[j+m-1][i] - vy[j-m][i]  );
				}
				vxx *= dhi;
				vyy *= dhi;

				divfield[j][i]=(vxx+vyy)*sqrt(pi[j][i]);
			}


		for (i=1;i<=NX;i+=IDX)
			for (j=1;j<=NY;j+=IDY){
				writedsk(fpx2,divfield[j][i],SNAP_FORMAT);
			}

		free_matrix(divfield,-nd+1,NY+nd,-nd+1,NX+nd);
		fclose(fpx2);
		fclose(fpy2);
		break;
	}

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}