depth.c

波浪数值模拟

/*
 * Copyright (c) 2001-2005 Falk Feddersen
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */



/* depth.c   Falk Feddersen */       

/* TODO!  make a depth_info_t which contains the depth file name and ascii/binary stuff etc.
   Load up the depth file in here */     

#include <stdio.h>
#include <math.h>

#include "depth.h"

field2D_depth_var *Depth_Vars;


void make_depth_var_ZA(field2D *ZA, const field2D *H)
{
  const double beta = -0.531;

  field2D_copy(ZA, H);   /* First make ZA = H */
  field2D_mult_const(ZA, beta);   /* ZA *= beta */  

}



void  init_depth_variables(depthinfo *D, int nx, int ny)
{

   /* Now do the depth variables */

  //   H = allocate_field2D_grid(nx-1,ny, ETAGRID);  // (double *) g_malloc(sizeof(double)*(nx-1));

   Depth_Vars = (field2D_depth_var * ) g_malloc(sizeof(field2D_depth_var));

   Depth_Vars->H  =  allocate_field2D_grid(nx+1,ny, ETAGRID);   
   Depth_Vars->HBX = allocate_field2D_grid(nx,ny, UGRID);
   Depth_Vars->HBY = allocate_field2D_grid(nx+1,ny, VGRID);
   Depth_Vars->HBXY = allocate_field2D_grid(nx,ny, VORTGRID);
   Depth_Vars->ZA =  allocate_field2D_grid(nx+1,ny, ETAGRID);

   H = Depth_Vars->H;   // BROKEN: needed because H is a global variable in bdefs.h 

   Depth_Vars->DEPTH  =  allocate_field2D_grid(nx-1,ny, ETAGRID);   
   Depth_Vars->DEPTHBX = allocate_field2D_grid(nx,ny, UGRID);
   Depth_Vars->DEPTHBY = allocate_field2D_grid(nx-1,ny, VGRID);
   Depth_Vars->DEPTHBXY = allocate_field2D_grid(nx,ny, VORTGRID);

   /* now load up or setup the depth H */

   switch (D->dtype) {
   case FLAT:  set_constant_depth(D->h0,H);
               break;
   case PLANAR: set_planar_depth(D->h0,D->slope,dx,H);
                break;
   case HFILE1D:  load_line_bathymetry(D->depth_file->str,H);
                break;
   case HFILE2D: load_full_bathymetry(D->depth_file->str,H);
                break;
   default: funwaveC_error_message("Shouldn't reach default in process_init_file: switch(){}!\n");
  }

   /* Now that H is good, do ZA, HBX, HBY etc. */

   make_depth_var_ZA(Depth_Vars->ZA, Depth_Vars->H);

   field2D_bary_eta_to_v(Depth_Vars->HBY, Depth_Vars->H);
   field2D_barx(Depth_Vars->HBX, Depth_Vars->H);
   field2D_apply_nogradient_bc(Depth_Vars->HBX);
   field2D_bary_u_to_vort(Depth_Vars->HBXY, Depth_Vars->HBX);
}

void  deallocate_depth_variables()
{

  /* deallocate the depth var information */

  deallocate_field2D(H);
  deallocate_field2D(Depth_Vars->HBX);
  deallocate_field2D(Depth_Vars->HBY);
  deallocate_field2D(Depth_Vars->ZA);
  g_free(Depth_Vars);


}


/* checks to make sure that  h+eta > 0, returns the minimum total water depth  */
double check_depth(const field2D *ETA)
{
  int i;
  int num = ETA->num;
  int M = ETA->M;

  const field2D *H = Depth_Vars->H;

  const double *etad = ETA->data;
  const double *hd = &(H->data[M]);

  double depth;
  double min_depth = 100;      /* a big number */

  for (i=0;i<num;i++) {
    depth = *hd++ + *etad++;
    if (depth < min_depth) {
      min_depth = depth;
    }
    if (isnan(depth)) {
      funwaveC_error_message("** depth.c: check_depth() - error, NAN in eta: ABORT");
    }
  }

  if (min_depth <= 0.0)
    funwaveC_error_message("** depth.c: check_depth() - error, total water depth (eta+h) <= 0.0");

  return min_depth;


}  


/* checks to make sure that  h+eta > 0, returns the minimum total water depth  */

void report_mass_conservation(const field2D *ETA)
{
  int i;
  int num = ETA->num;

  const double *etad = ETA->data;
  double integral_eta = 0.0;

  for (i=0;i<num;i++) {
    integral_eta += *etad++;
  }
  integral_eta *= (dx * dy);

  fprintf(stderr," Mass conservation: \\int \\eta dx dy = %g (m^3)\n", integral_eta);


}  



void set_constant_depth(gdouble depth, field2D  *H)
{
   int i;
   int num = H->num;
   double *hd = H->data;

   for (i=0;i<num;i++) {
     *hd++ = depth;
   }


#ifdef NOSLIP
   HEXT0 = depth;
   HEXTN = depth;
#endif

}


void set_planar_depth(gdouble slope, gdouble h0, gdouble dx, field2D *H)
{
  int N = H->N;
  int M = H->M;
  int i,j;
  double h;

  for (i=0;i<N;i++) {
    h = h0+slope*(dx*i+dx/2);
    for (j=0;j<M;j++) {
      DR2(H,i,j) = h;
    }
  }


  /* Get rid of this stuff */

#ifdef NOSLIP
   HEXT0 = 1.5*H[0]-0.5*H[1];
   HEXTN = 1.5*H[NX-2]-0.5*H[NX-3];
   if ((HEXT0<=0)||(HEXTN<=0)) 
      funwaveC_error_message("Warning extrapolated boundary depths <=0 for no-slip BCs.");
#endif

}


void load_line_bathymetry(char *fname, field2D *H)
{

  int N = H->N;
  int M = H->M;
  FILE *fp;
  int i,j;
  gdouble a;
  char msg[80];

   if ((fp=fopen(fname,"r"))==NULL) {
       sprintf(msg,"Error loading line bathymetry file: %s\n",fname);
       funwaveC_error_message(msg);
   }

   for (i=1;i<N-1;i++) {
      fscanf(fp,"%lf",&a);
      for (j=0;j<M;j++) {
        DR2(H,i,j) = a;
      }
   }

   fclose(fp);

   /* now do the interior boundary depths */

   for (j=0;j<M;j++) {
     DR2(H,0,j) = DR2(H,1,j);
     DR2(H,N-1,j) = DR2(H,N-2,j);
   }


}


void load_full_bathymetry(char *fname, field2D *H)
{

  int N = H->N;
  int M = H->M;
  FILE *fp;
  int i,j;
  gdouble a;
  char msg[80];
 
   if ((fp=fopen(fname,"r"))==NULL) {
       sprintf(msg,"Error loading line bathymetry file: %s\n",fname);
       funwaveC_error_message(msg);
   }

   for (i=0;i<N;i++) {
      for (j=0;j<M;j++) {
        fscanf(fp,"%lf",&a);
        DR2(H,i,j) = a;
      }
   }

   fclose(fp);

#ifdef NOSLIP
   HEXT0 = 1.5*H[0]-0.5*H[1];
   HEXTN = 1.5*H[NX-2]-0.5*H[NX-3];
   if ((HEXT0<=0)||(HEXTN<=0)) 
      funwaveC_error_message("Warning extrapolated boundary depths <=0 for no-slip BCs.");
#endif

}