surface_acoustic_PML.c 1.41 KB
Newer Older
Tilman Steinweg's avatar
Tilman Steinweg committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
/*-----------------------------------------------------------------------------------------
 * 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>.
-----------------------------------------------------------------------------------------*/

/*------------------------------------------------------------------------
 *   stress free surface condition
 *   last update 03/01/04, T. Bohlen
 *
 *  ----------------------------------------------------------------------*/

#include "fd.h"

void surface_acoustic_PML(int ndepth, float ** sp){


	int i,j, m;
	int fdoh;
	extern int NX;
	extern int FDORDER;
	
	fdoh = FDORDER/2;

	j=ndepth;     /* The free surface is located exactly in y=1/2*dh !! */
	for (i=1;i<=NX;i++){
		for (m=1; m<=fdoh; m++) {
			sp[j-m][i] = -sp[j+m][i];
		}
	}
}