1: static char help[] = "This example demonstrates the use of DMNetwork interface for solving a steady-state water network model.\n\
  2:                       The water network equations follow those used for the package EPANET\n\
  3:                       The data file format used is from the EPANET package (https://www.epa.gov/water-research/epanet).\n\
  4:                       Run this program: mpiexec -n <n> ./water\n\\n";

  6: /* T
  7:    Concepts: DMNetwork
  8:    Concepts: PETSc SNES solver
  9: */

 11: #include "water.h"
 12:  #include <petscdmnetwork.h>

 14: int main(int argc,char ** argv)
 15: {
 16:   PetscErrorCode   ierr;
 17:   char             waterdata_file[PETSC_MAX_PATH_LEN]="sample1.inp";
 18:   WATERDATA        *waterdata;
 19:   AppCtx_Water     appctx;
 20:   PetscLogStage    stage1,stage2;
 21:   PetscMPIInt      crank;
 22:   DM               networkdm;
 23:   PetscInt         *edgelist = NULL;
 24:   PetscInt         nv,ne,i;
 25:   const PetscInt   *vtx,*edges;
 26:   Vec              X,F;
 27:   SNES             snes;
 28:   PetscInt         ngvtx=PETSC_DETERMINE,ngedge=PETSC_DETERMINE;
 29:   SNESConvergedReason reason;

 31:   PetscInitialize(&argc,&argv,"wateroptions",help);
 32:   MPI_Comm_rank(PETSC_COMM_WORLD,&crank);

 34:   /* Create an empty network object */
 35:   DMNetworkCreate(PETSC_COMM_WORLD,&networkdm);

 37:   /* Register the components in the network */
 38:   DMNetworkRegisterComponent(networkdm,"edgestruct",sizeof(struct _p_EDGE_Water),&appctx.compkey_edge);
 39:   DMNetworkRegisterComponent(networkdm,"busstruct",sizeof(struct _p_VERTEX_Water),&appctx.compkey_vtx);

 41:   PetscLogStageRegister("Read Data",&stage1);
 42:   PetscLogStagePush(stage1);
 43:   PetscNew(&waterdata);

 45:   /* READ THE DATA */
 46:   if (!crank) {
 47:     /* READ DATA. Only rank 0 reads the data */
 48:     PetscOptionsGetString(NULL,NULL,"-waterdata",waterdata_file,PETSC_MAX_PATH_LEN-1,NULL);
 49:     WaterReadData(waterdata,waterdata_file);

 51:     PetscCalloc1(2*waterdata->nedge,&edgelist);
 52:     GetListofEdges_Water(waterdata,edgelist);
 53:   }
 54:   PetscLogStagePop();

 56:   PetscLogStageRegister("Create network",&stage2);
 57:   PetscLogStagePush(stage2);

 59:   /* Set numbers of nodes and edges */
 60:   DMNetworkSetSizes(networkdm,1,0,&waterdata->nvertex,&waterdata->nedge,&ngvtx,&ngedge);
 61:   if (!crank) {
 62:     PetscPrintf(PETSC_COMM_SELF,"water nvertices %D, nedges %D\n",waterdata->nvertex,waterdata->nedge);
 63:   }

 65:   /* Add edge connectivity */
 66:   DMNetworkSetEdgeList(networkdm,&edgelist,NULL);

 68:   /* Set up the network layout */
 69:   DMNetworkLayoutSetUp(networkdm);

 71:   if (!crank) {
 72:     PetscFree(edgelist);
 73:   }

 75:   /* ADD VARIABLES AND COMPONENTS FOR THE NETWORK */
 76:   DMNetworkGetSubnetworkInfo(networkdm,0,&nv,&ne,&vtx,&edges);

 78:   for (i = 0; i < ne; i++) {
 79:     DMNetworkAddComponent(networkdm,edges[i],appctx.compkey_edge,&waterdata->edge[i]);
 80:   }

 82:   for (i = 0; i < nv; i++) {
 83:     DMNetworkAddComponent(networkdm,vtx[i],appctx.compkey_vtx,&waterdata->vertex[i]);
 84:     /* Add number of variables */
 85:     DMNetworkAddNumVariables(networkdm,vtx[i],1);
 86:   }

 88:   /* Set up DM for use */
 89:   DMSetUp(networkdm);

 91:   if (!crank) {
 92:     PetscFree(waterdata->vertex);
 93:     PetscFree(waterdata->edge);
 94:   }
 95:   PetscFree(waterdata);

 97:   /* Distribute networkdm to multiple processes */
 98:   DMNetworkDistribute(&networkdm,0);

100:   PetscLogStagePop();

102:   DMCreateGlobalVector(networkdm,&X);
103:   VecDuplicate(X,&F);

105:   /* HOOK UP SOLVER */
106:   SNESCreate(PETSC_COMM_WORLD,&snes);
107:   SNESSetDM(snes,networkdm);
108:   SNESSetOptionsPrefix(snes,"water_");
109:   SNESSetFunction(snes,F,WaterFormFunction,NULL);
110:   SNESSetFromOptions(snes);

112:   WaterSetInitialGuess(networkdm,X);
113:   /* VecView(X,PETSC_VIEWER_STDOUT_WORLD); */

115:   SNESSolve(snes,NULL,X);
116:   SNESGetConvergedReason(snes,&reason);
117:   if (reason < 0) {
118:     SETERRQ(PETSC_COMM_SELF,0,"No solution found for the water network");
119:   }
120:   /* VecView(X,PETSC_VIEWER_STDOUT_WORLD); */

122:   VecDestroy(&X);
123:   VecDestroy(&F);
124:   SNESDestroy(&snes);
125:   DMDestroy(&networkdm);
126:   PetscFinalize();
127:   return ierr;
128: }

130: /*TEST

132:    build:
133:       depends: waterreaddata.c waterfunctions.c
134:       requires: !complex double define(PETSC_HAVE_ATTRIBUTEALIGNED)

136:    test:
137:       args: -water_snes_converged_reason -options_left no
138:       localrunfiles: wateroptions sample1.inp
139:       output_file: output/water.out
140:       requires: double !complex define(PETSC_HAVE_ATTRIBUTEALIGNED)

142:    test:
143:       suffix: 2
144:       nsize: 3
145:       args: -water_snes_converged_reason -options_left no
146:       localrunfiles: wateroptions sample1.inp
147:       output_file: output/water.out
148:       requires: double !complex define(PETSC_HAVE_ATTRIBUTEALIGNED)

150: TEST*/