Date: 2022-03-04T17:39:29+00:00

Actual source code: ex1.c

      1: static char help[] = "This example demonstrates the use of DMNetwork interface with subnetworks for solving a coupled nonlinear \n\
      2:                       electric power grid and water pipe problem.\n\
      3:                       The available solver options are in the ex1options file \n\
      4:                       and the data files are in the datafiles of subdirectories.\n\
      5:                       This example shows the use of subnetwork feature in DMNetwork. \n\
      6:                       Run this program: mpiexec -n <n> ./ex1 \n\\n";

      8: /* T
      9:    Concepts: DMNetwork
     10:    Concepts: PETSc SNES solver
     11: */

     13: #include "power/power.h"
     14: #include "water/water.h"

     16: typedef struct{
     17:   UserCtx_Power appctx_power;
     18:   AppCtx_Water  appctx_water;
     19:   PetscInt      subsnes_id; /* snes solver id */
     20:   PetscInt      it;         /* iteration number */
     21:   Vec           localXold;  /* store previous solution, used by FormFunction_Dummy() */
     22: } UserCtx;

     24: PetscErrorCode UserMonitor(SNES snes,PetscInt its,PetscReal fnorm ,void *appctx)
     25: {
     27:   UserCtx        *user = (UserCtx*)appctx;
     28:   Vec            X,localXold = user->localXold;
     29:   DM             networkdm;
     30:   PetscMPIInt    rank;
     31:   MPI_Comm       comm;

     34:   PetscObjectGetComm((PetscObject)snes,&comm);
     35:   MPI_Comm_rank(comm,&rank);
     36: #if 0
     37:   if (rank == 0) {
     38:     PetscInt       subsnes_id = user->subsnes_id;
     39:     if (subsnes_id == 2) {
     40:       PetscPrintf(PETSC_COMM_SELF," it %D, subsnes_id %D, fnorm %g\n",user->it,user->subsnes_id,(double)fnorm);
     41:     } else {
     42:       PetscPrintf(PETSC_COMM_SELF,"       subsnes_id %D, fnorm %g\n",user->subsnes_id,(double)fnorm);
     43:     }
     44:   }
     45: #endif
     46:   SNESGetSolution(snes,&X);
     47:   SNESGetDM(snes,&networkdm);
     48:   DMGlobalToLocalBegin(networkdm,X,INSERT_VALUES,localXold);
     49:   DMGlobalToLocalEnd(networkdm,X,INSERT_VALUES,localXold);
     50:   return(0);
     51: }

     53: PetscErrorCode FormJacobian_subPower(SNES snes,Vec X, Mat J,Mat Jpre,void *appctx)
     54: {
     56:   DM             networkdm;
     57:   Vec            localX;
     58:   PetscInt       nv,ne,i,j,offset,nvar,row;
     59:   const PetscInt *vtx,*edges;
     60:   PetscBool      ghostvtex;
     61:   PetscScalar    one = 1.0;
     62:   PetscMPIInt    rank;
     63:   MPI_Comm       comm;

     66:   SNESGetDM(snes,&networkdm);
     67:   DMGetLocalVector(networkdm,&localX);

     69:   PetscObjectGetComm((PetscObject)networkdm,&comm);
     70:   MPI_Comm_rank(comm,&rank);

     72:   DMGlobalToLocalBegin(networkdm,X,INSERT_VALUES,localX);
     73:   DMGlobalToLocalEnd(networkdm,X,INSERT_VALUES,localX);

     75:   MatZeroEntries(J);

     77:   /* Power subnetwork: copied from power/FormJacobian_Power() */
     78:   DMNetworkGetSubnetwork(networkdm,0,&nv,&ne,&vtx,&edges);
     79:   FormJacobian_Power_private(networkdm,localX,J,nv,ne,vtx,edges,appctx);

     81:   /* Water subnetwork: Identity */
     82:   DMNetworkGetSubnetwork(networkdm,1,&nv,&ne,&vtx,&edges);
     83:   for (i=0; i<nv; i++) {
     84:     DMNetworkIsGhostVertex(networkdm,vtx[i],&ghostvtex);
     85:     if (ghostvtex) continue;

     87:     DMNetworkGetGlobalVecOffset(networkdm,vtx[i],ALL_COMPONENTS,&offset);
     88:     DMNetworkGetComponent(networkdm,vtx[i],ALL_COMPONENTS,NULL,NULL,&nvar);
     89:     for (j=0; j<nvar; j++) {
     90:       row = offset + j;
     91:       MatSetValues(J,1,&row,1,&row,&one,ADD_VALUES);
     92:     }
     93:   }
     94:   MatAssemblyBegin(J,MAT_FINAL_ASSEMBLY);
     95:   MatAssemblyEnd(J,MAT_FINAL_ASSEMBLY);

     97:   DMRestoreLocalVector(networkdm,&localX);
     98:   return(0);
     99: }

    101: /* Dummy equation localF(X) = localX - localXold */
    102: PetscErrorCode FormFunction_Dummy(DM networkdm,Vec localX, Vec localF,PetscInt nv,PetscInt ne,const PetscInt* vtx,const PetscInt* edges,void* appctx)
    103: {
    104:   PetscErrorCode    ierr;
    105:   const PetscScalar *xarr,*xoldarr;
    106:   PetscScalar       *farr;
    107:   PetscInt          i,j,offset,nvar;
    108:   PetscBool         ghostvtex;
    109:   UserCtx           *user = (UserCtx*)appctx;
    110:   Vec               localXold = user->localXold;

    113:   VecGetArrayRead(localX,&xarr);
    114:   VecGetArrayRead(localXold,&xoldarr);
    115:   VecGetArray(localF,&farr);

    117:   for (i=0; i<nv; i++) {
    118:     DMNetworkIsGhostVertex(networkdm,vtx[i],&ghostvtex);
    119:     if (ghostvtex) continue;

    121:     DMNetworkGetLocalVecOffset(networkdm,vtx[i],ALL_COMPONENTS,&offset);
    122:     DMNetworkGetComponent(networkdm,vtx[i],ALL_COMPONENTS,NULL,NULL,&nvar);
    123:     for (j=0; j<nvar; j++) {
    124:       farr[offset+j] = xarr[offset+j] - xoldarr[offset+j];
    125:     }
    126:   }

    128:   VecRestoreArrayRead(localX,&xarr);
    129:   VecRestoreArrayRead(localXold,&xoldarr);
    130:   VecRestoreArray(localF,&farr);
    131:   return(0);
    132: }

    134: PetscErrorCode FormFunction(SNES snes,Vec X,Vec F,void *appctx)
    135: {
    137:   DM             networkdm;
    138:   Vec            localX,localF;
    139:   PetscInt       nv,ne,v;
    140:   const PetscInt *vtx,*edges;
    141:   PetscMPIInt    rank;
    142:   MPI_Comm       comm;
    143:   UserCtx        *user = (UserCtx*)appctx;
    144:   UserCtx_Power  appctx_power = (*user).appctx_power;
    145:   AppCtx_Water   appctx_water = (*user).appctx_water;

    148:   SNESGetDM(snes,&networkdm);
    149:   PetscObjectGetComm((PetscObject)networkdm,&comm);
    150:   MPI_Comm_rank(comm,&rank);

    152:   DMGetLocalVector(networkdm,&localX);
    153:   DMGetLocalVector(networkdm,&localF);
    154:   VecSet(F,0.0);
    155:   VecSet(localF,0.0);

    157:   DMGlobalToLocalBegin(networkdm,X,INSERT_VALUES,localX);
    158:   DMGlobalToLocalEnd(networkdm,X,INSERT_VALUES,localX);

    160:   /* Form Function for power subnetwork */
    161:   DMNetworkGetSubnetwork(networkdm,0,&nv,&ne,&vtx,&edges);
    162:   if (user->subsnes_id == 1) { /* snes_water only */
    163:     FormFunction_Dummy(networkdm,localX,localF,nv,ne,vtx,edges,user);
    164:   } else {
    165:     FormFunction_Power(networkdm,localX,localF,nv,ne,vtx,edges,&appctx_power);
    166:   }

    168:   /* Form Function for water subnetwork */
    169:   DMNetworkGetSubnetwork(networkdm,1,&nv,&ne,&vtx,&edges);
    170:   if (user->subsnes_id == 0) { /* snes_power only */
    171:     FormFunction_Dummy(networkdm,localX,localF,nv,ne,vtx,edges,user);
    172:   } else {
    173:     FormFunction_Water(networkdm,localX,localF,nv,ne,vtx,edges,NULL);
    174:   }

    176:   /* Illustrate how to access the coupling vertex of the subnetworks without doing anything to F yet */
    177:   DMNetworkGetSharedVertices(networkdm,&nv,&vtx);
    178:   for (v=0; v<nv; v++) {
    179:     PetscInt       key,ncomp,nvar,nconnedges,k,e,keye,goffset[3];
    180:     void*          component;
    181:     const PetscInt *connedges;

    183:     DMNetworkGetComponent(networkdm,vtx[v],ALL_COMPONENTS,NULL,NULL,&nvar);
    184:     DMNetworkGetNumComponents(networkdm,vtx[v],&ncomp);
    185:     /* printf("  [%d] coupling vertex[%D]: v %D, ncomp %D; nvar %D\n",rank,v,vtx[v], ncomp,nvar); */

    187:     for (k=0; k<ncomp; k++) {
    188:       DMNetworkGetComponent(networkdm,vtx[v],k,&key,&component,&nvar);
    189:       DMNetworkGetGlobalVecOffset(networkdm,vtx[v],k,&goffset[k]);

    191:       /* Verify the coupling vertex is a powernet load vertex or a water vertex */
    192:       switch (k) {
    193:       case 0:
    194:         if (key != appctx_power.compkey_bus || nvar != 2) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"key %D not a power bus vertex or nvar %D != 2",key,nvar);
    195:         break;
    196:       case 1:
    197:         if (key != appctx_power.compkey_load || nvar != 0 || goffset[1] != goffset[0]+2) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Not a power load vertex");
    198:         break;
    199:       case 2:
    200:         if (key != appctx_water.compkey_vtx || nvar != 1 || goffset[2] != goffset[1]) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Not a water vertex");
    201:         break;
    202:       default: SETERRQ1(PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "k %D is wrong",k);
    203:       }
    204:       /* printf("  [%d] coupling vertex[%D]: key %D; nvar %D, goffset %D\n",rank,v,key,nvar,goffset[k]); */
    205:     }

    207:     /* Get its supporting edges */
    208:     DMNetworkGetSupportingEdges(networkdm,vtx[v],&nconnedges,&connedges);
    209:     /* printf("\n[%d] coupling vertex: nconnedges %D\n",rank,nconnedges); */
    210:     for (k=0; k<nconnedges; k++) {
    211:       e = connedges[k];
    212:       DMNetworkGetNumComponents(networkdm,e,&ncomp);
    213:       /* printf("\n  [%d] connected edge[%D]=%D has ncomp %D\n",rank,k,e,ncomp); */
    214:       DMNetworkGetComponent(networkdm,e,0,&keye,&component,NULL);
    215:       if (keye == appctx_water.compkey_edge) { /* water_compkey_edge */
    216:         EDGE_Water        edge=(EDGE_Water)component;
    217:         if (edge->type == EDGE_TYPE_PUMP) {
    218:           /* printf("  connected edge[%D]=%D has keye=%D, is appctx_water.compkey_edge with EDGE_TYPE_PUMP\n",k,e,keye); */
    219:         }
    220:       } else { /* ower->compkey_branch */
    221:         if (keye != appctx_power.compkey_branch) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Not a power branch");
    222:       }
    223:     }
    224:   }

    226:   DMRestoreLocalVector(networkdm,&localX);

    228:   DMLocalToGlobalBegin(networkdm,localF,ADD_VALUES,F);
    229:   DMLocalToGlobalEnd(networkdm,localF,ADD_VALUES,F);
    230:   DMRestoreLocalVector(networkdm,&localF);
    231: #if 0
    232:   if (rank == 0) printf("F:\n");
    233:   VecView(F,PETSC_VIEWER_STDOUT_WORLD);
    234: #endif
    235:   return(0);
    236: }

    238: PetscErrorCode SetInitialGuess(DM networkdm,Vec X,void* appctx)
    239: {
    241:   PetscInt       nv,ne,i,j,ncomp,offset,key;
    242:   const PetscInt *vtx,*edges;
    243:   UserCtx        *user = (UserCtx*)appctx;
    244:   Vec            localX = user->localXold;
    245:   UserCtx_Power  appctx_power = (*user).appctx_power;
    246:   AppCtx_Water   appctx_water = (*user).appctx_water;
    247:   PetscBool      ghost;
    248:   PetscScalar    *xarr;
    249:   VERTEX_Power   bus;
    250:   VERTEX_Water   vertex;
    251:   void*          component;
    252:   GEN            gen;

    255:   VecSet(X,0.0);
    256:   VecSet(localX,0.0);

    258:   /* Set initial guess for power subnetwork */
    259:   DMNetworkGetSubnetwork(networkdm,0,&nv,&ne,&vtx,&edges);
    260:   SetInitialGuess_Power(networkdm,localX,nv,ne,vtx,edges,&appctx_power);

    262:   /* Set initial guess for water subnetwork */
    263:   DMNetworkGetSubnetwork(networkdm,1,&nv,&ne,&vtx,&edges);
    264:   SetInitialGuess_Water(networkdm,localX,nv,ne,vtx,edges,NULL);

    266:   /* Set initial guess at the coupling vertex */
    267:   VecGetArray(localX,&xarr);
    268:   DMNetworkGetSharedVertices(networkdm,&nv,&vtx);
    269:   for (i=0; i<nv; i++) {
    270:     DMNetworkIsGhostVertex(networkdm,vtx[i],&ghost);
    271:     if (ghost) continue;

    273:     DMNetworkGetNumComponents(networkdm,vtx[i],&ncomp);
    274:     for (j=0; j<ncomp; j++) {
    275:       DMNetworkGetLocalVecOffset(networkdm,vtx[i],j,&offset);
    276:       DMNetworkGetComponent(networkdm,vtx[i],j,&key,(void**)&component,NULL);
    277:       if (key == appctx_power.compkey_bus) {
    278:         bus = (VERTEX_Power)(component);
    279:         xarr[offset]   = bus->va*PETSC_PI/180.0;
    280:         xarr[offset+1] = bus->vm;
    281:       } else if (key == appctx_power.compkey_gen) {
    282:         gen = (GEN)(component);
    283:         if (!gen->status) continue;
    284:         xarr[offset+1] = gen->vs;
    285:       } else if (key == appctx_water.compkey_vtx) {
    286:         vertex = (VERTEX_Water)(component);
    287:         if (vertex->type == VERTEX_TYPE_JUNCTION) {
    288:           xarr[offset] = 100;
    289:         } else if (vertex->type == VERTEX_TYPE_RESERVOIR) {
    290:           xarr[offset] = vertex->res.head;
    291:         } else {
    292:           xarr[offset] = vertex->tank.initlvl + vertex->tank.elev;
    293:         }
    294:       }
    295:     }
    296:   }
    297:   VecRestoreArray(localX,&xarr);

    299:   DMLocalToGlobalBegin(networkdm,localX,ADD_VALUES,X);
    300:   DMLocalToGlobalEnd(networkdm,localX,ADD_VALUES,X);
    301:   return(0);
    302: }

    304: int main(int argc,char **argv)
    305: {
    306:   PetscErrorCode   ierr;
    307:   DM               networkdm;
    308:   PetscLogStage    stage[4];
    309:   PetscMPIInt      rank,size;
    310:   PetscInt         Nsubnet=2,numVertices[2],numEdges[2],i,j,nv,ne,it_max=10;
    311:   const PetscInt   *vtx,*edges;
    312:   Vec              X,F;
    313:   SNES             snes,snes_power,snes_water;
    314:   Mat              Jac;
    315:   PetscBool        ghost,viewJ=PETSC_FALSE,viewX=PETSC_FALSE,viewDM=PETSC_FALSE,test=PETSC_FALSE,distribute=PETSC_TRUE,flg;
    316:   UserCtx          user;
    317:   SNESConvergedReason reason;

    319:   /* Power subnetwork */
    320:   UserCtx_Power       *appctx_power  = &user.appctx_power;
    321:   char                pfdata_file[PETSC_MAX_PATH_LEN] = "power/case9.m";
    322:   PFDATA              *pfdata = NULL;
    323:   PetscInt            genj,loadj,*edgelist_power = NULL,power_netnum;
    324:   PetscScalar         Sbase = 0.0;

    326:   /* Water subnetwork */
    327:   AppCtx_Water        *appctx_water = &user.appctx_water;
    328:   WATERDATA           *waterdata = NULL;
    329:   char                waterdata_file[PETSC_MAX_PATH_LEN] = "water/sample1.inp";
    330:   PetscInt            *edgelist_water = NULL,water_netnum;

    332:   /* Shared vertices between subnetworks */
    333:   PetscInt           power_svtx,water_svtx;

    335:   PetscInitialize(&argc,&argv,"ex1options",help);if (ierr) return ierr;
    336:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
    337:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

    339:   /* (1) Read Data - Only rank 0 reads the data */
    340:   /*--------------------------------------------*/
    341:   PetscLogStageRegister("Read Data",&stage[0]);
    342:   PetscLogStagePush(stage[0]);

    344:   for (i=0; i<Nsubnet; i++) {
    345:     numVertices[i] = 0;
    346:     numEdges[i]    = 0;
    347:   }

    349:   /* All processes READ THE DATA FOR THE FIRST SUBNETWORK: Electric Power Grid */
    350:   /* Used for shared vertex, because currently the coupling info must be available in all processes!!! */
    351:   PetscOptionsGetString(NULL,NULL,"-pfdata",pfdata_file,PETSC_MAX_PATH_LEN-1,NULL);
    352:   PetscNew(&pfdata);
    353:   PFReadMatPowerData(pfdata,pfdata_file);
    354:   if (rank == 0) {
    355:     PetscPrintf(PETSC_COMM_SELF,"Power network: nb = %D, ngen = %D, nload = %D, nbranch = %D\n",pfdata->nbus,pfdata->ngen,pfdata->nload,pfdata->nbranch);
    356:   }
    357:   Sbase = pfdata->sbase;
    358:   if (rank == 0) { /* proc[0] will create Electric Power Grid */
    359:     numEdges[0]    = pfdata->nbranch;
    360:     numVertices[0] = pfdata->nbus;

    362:     PetscMalloc1(2*numEdges[0],&edgelist_power);
    363:     GetListofEdges_Power(pfdata,edgelist_power);
    364:   }
    365:   /* Broadcast power Sbase to all processors */
    366:   MPI_Bcast(&Sbase,1,MPIU_SCALAR,0,PETSC_COMM_WORLD);
    367:   appctx_power->Sbase     = Sbase;
    368:   appctx_power->jac_error = PETSC_FALSE;
    369:   /* If external option activated. Introduce error in jacobian */
    370:   PetscOptionsHasName(NULL,NULL, "-jac_error", &appctx_power->jac_error);

    372:   /* All processes READ THE DATA FOR THE SECOND SUBNETWORK: Water */
    373:   /* Used for shared vertex, because currently the coupling info must be available in all processes!!! */
    374:   PetscNew(&waterdata);
    375:   PetscOptionsGetString(NULL,NULL,"-waterdata",waterdata_file,PETSC_MAX_PATH_LEN-1,NULL);
    376:   WaterReadData(waterdata,waterdata_file);
    377:   if (size == 1 || (size > 1 && rank == 1)) {
    378:     PetscCalloc1(2*waterdata->nedge,&edgelist_water);
    379:     GetListofEdges_Water(waterdata,edgelist_water);
    380:     numEdges[1]    = waterdata->nedge;
    381:     numVertices[1] = waterdata->nvertex;
    382:   }
    383:   PetscLogStagePop();

    385:   /* (2) Create a network consist of two subnetworks */
    386:   /*-------------------------------------------------*/
    387:   PetscLogStageRegister("Net Setup",&stage[1]);
    388:   PetscLogStagePush(stage[1]);

    390:   PetscOptionsGetBool(NULL,NULL,"-viewDM",&viewDM,NULL);
    391:   PetscOptionsGetBool(NULL,NULL,"-test",&test,NULL);
    392:   PetscOptionsGetBool(NULL,NULL,"-distribute",&distribute,NULL);

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

    397:   /* Register the components in the network */
    398:   DMNetworkRegisterComponent(networkdm,"branchstruct",sizeof(struct _p_EDGE_Power),&appctx_power->compkey_branch);
    399:   DMNetworkRegisterComponent(networkdm,"busstruct",sizeof(struct _p_VERTEX_Power),&appctx_power->compkey_bus);
    400:   DMNetworkRegisterComponent(networkdm,"genstruct",sizeof(struct _p_GEN),&appctx_power->compkey_gen);
    401:   DMNetworkRegisterComponent(networkdm,"loadstruct",sizeof(struct _p_LOAD),&appctx_power->compkey_load);

    403:   DMNetworkRegisterComponent(networkdm,"edge_water",sizeof(struct _p_EDGE_Water),&appctx_water->compkey_edge);
    404:   DMNetworkRegisterComponent(networkdm,"vertex_water",sizeof(struct _p_VERTEX_Water),&appctx_water->compkey_vtx);
    405: #if 0
    406:   PetscPrintf(PETSC_COMM_WORLD,"power->compkey_branch %d\n",appctx_power->compkey_branch);
    407:   PetscPrintf(PETSC_COMM_WORLD,"power->compkey_bus    %d\n",appctx_power->compkey_bus);
    408:   PetscPrintf(PETSC_COMM_WORLD,"power->compkey_gen    %d\n",appctx_power->compkey_gen);
    409:   PetscPrintf(PETSC_COMM_WORLD,"power->compkey_load   %d\n",appctx_power->compkey_load);
    410:   PetscPrintf(PETSC_COMM_WORLD,"water->compkey_edge   %d\n",appctx_water->compkey_edge);
    411:   PetscPrintf(PETSC_COMM_WORLD,"water->compkey_vtx    %d\n",appctx_water->compkey_vtx);
    412: #endif
    413:   PetscSynchronizedPrintf(PETSC_COMM_WORLD,"[%d] Total local nvertices %D + %D = %D, nedges %D + %D = %D\n",rank,numVertices[0],numVertices[1],numVertices[0]+numVertices[1],numEdges[0],numEdges[1],numEdges[0]+numEdges[1]);
    414:   PetscSynchronizedFlush(PETSC_COMM_WORLD,PETSC_STDOUT);

    416:   DMNetworkSetNumSubNetworks(networkdm,PETSC_DECIDE,Nsubnet);
    417:   DMNetworkAddSubnetwork(networkdm,"power",numEdges[0],edgelist_power,&power_netnum);
    418:   DMNetworkAddSubnetwork(networkdm,"water",numEdges[1],edgelist_water,&water_netnum);

    420:   /* vertex subnet[0].4 shares with vertex subnet[1].0 */
    421:   power_svtx = 4; water_svtx = 0;
    422:   DMNetworkAddSharedVertices(networkdm,power_netnum,water_netnum,1,&power_svtx,&water_svtx);

    424:   /* Set up the network layout */
    425:   DMNetworkLayoutSetUp(networkdm);

    427:   /* ADD VARIABLES AND COMPONENTS FOR THE POWER SUBNETWORK */
    428:   /*-------------------------------------------------------*/
    429:   genj = 0; loadj = 0;
    430:   DMNetworkGetSubnetwork(networkdm,power_netnum,&nv,&ne,&vtx,&edges);

    432:   for (i = 0; i < ne; i++) {
    433:     DMNetworkAddComponent(networkdm,edges[i],appctx_power->compkey_branch,&pfdata->branch[i],0);
    434:   }

    436:   for (i = 0; i < nv; i++) {
    437:     DMNetworkIsSharedVertex(networkdm,vtx[i],&flg);
    438:     if (flg) continue;

    440:     DMNetworkAddComponent(networkdm,vtx[i],appctx_power->compkey_bus,&pfdata->bus[i],2);
    441:     if (pfdata->bus[i].ngen) {
    442:       for (j = 0; j < pfdata->bus[i].ngen; j++) {
    443:         DMNetworkAddComponent(networkdm,vtx[i],appctx_power->compkey_gen,&pfdata->gen[genj++],0);
    444:       }
    445:     }
    446:     if (pfdata->bus[i].nload) {
    447:       for (j=0; j < pfdata->bus[i].nload; j++) {
    448:         DMNetworkAddComponent(networkdm,vtx[i],appctx_power->compkey_load,&pfdata->load[loadj++],0);
    449:       }
    450:     }
    451:   }

    453:   /* ADD VARIABLES AND COMPONENTS FOR THE WATER SUBNETWORK */
    454:   /*-------------------------------------------------------*/
    455:   DMNetworkGetSubnetwork(networkdm,water_netnum,&nv,&ne,&vtx,&edges);
    456:   for (i = 0; i < ne; i++) {
    457:     DMNetworkAddComponent(networkdm,edges[i],appctx_water->compkey_edge,&waterdata->edge[i],0);
    458:   }

    460:   for (i = 0; i < nv; i++) {
    461:     DMNetworkIsSharedVertex(networkdm,vtx[i],&flg);
    462:     if (flg) continue;

    464:     DMNetworkAddComponent(networkdm,vtx[i],appctx_water->compkey_vtx,&waterdata->vertex[i],1);
    465:   }

    467:   /* ADD VARIABLES AND COMPONENTS AT THE SHARED VERTEX: net[0].4 coupls with net[1].0 -- only the owner of the vertex does this */
    468:   /*----------------------------------------------------------------------------------------------------------------------------*/
    469:   DMNetworkGetSharedVertices(networkdm,&nv,&vtx);
    470:   for (i = 0; i < nv; i++) {
    471:     DMNetworkIsGhostVertex(networkdm,vtx[i],&ghost);
    472:     /* printf("[%d] coupling info: nv %d; sv[0] %d; ghost %d\n",rank,nv,vtx[0],ghost); */
    473:     if (ghost) continue;

    475:     /* power */
    476:     DMNetworkAddComponent(networkdm,vtx[i],appctx_power->compkey_bus,&pfdata->bus[4],2);
    477:     /* bus[4] is a load, add its component */
    478:     DMNetworkAddComponent(networkdm,vtx[i],appctx_power->compkey_load,&pfdata->load[0],0);

    480:     /* water */
    481:     DMNetworkAddComponent(networkdm,vtx[i],appctx_water->compkey_vtx,&waterdata->vertex[0],1);
    482:   }

    484:   /* Set up DM for use */
    485:   DMSetUp(networkdm);
    486:   if (viewDM) {
    487:     PetscPrintf(PETSC_COMM_WORLD,"\nAfter DMSetUp, DMView:\n");
    488:     DMView(networkdm,PETSC_VIEWER_STDOUT_WORLD);
    489:   }

    491:   /* Free user objects */
    492:   PetscFree(edgelist_power);
    493:   PetscFree(pfdata->bus);
    494:   PetscFree(pfdata->gen);
    495:   PetscFree(pfdata->branch);
    496:   PetscFree(pfdata->load);
    497:   PetscFree(pfdata);

    499:   PetscFree(edgelist_water);
    500:   PetscFree(waterdata->vertex);
    501:   PetscFree(waterdata->edge);
    502:   PetscFree(waterdata);

    504:   /* Re-distribute networkdm to multiple processes for better job balance */
    505:   if (size >1 && distribute) {
    506:     DMNetworkDistribute(&networkdm,0);
    507:     if (viewDM) {
    508:       PetscPrintf(PETSC_COMM_WORLD,"\nAfter DMNetworkDistribute, DMView:\n");
    509:       DMView(networkdm,PETSC_VIEWER_STDOUT_WORLD);
    510:     }
    511:   }

    513:   /* Test DMNetworkGetSubnetwork() and DMNetworkGetSubnetworkSharedVertices() */
    514:   if (test) {
    515:     PetscInt  v,gidx;
    516:     MPI_Barrier(PETSC_COMM_WORLD);
    517:     for (i=0; i<Nsubnet; i++) {
    518:       DMNetworkGetSubnetwork(networkdm,i,&nv,&ne,&vtx,&edges);
    519:       PetscPrintf(PETSC_COMM_SELF,"[%d] After distribute, subnet[%d] ne %d, nv %d\n",rank,i,ne,nv);
    520:       MPI_Barrier(PETSC_COMM_WORLD);

    522:       for (v=0; v<nv; v++) {
    523:         DMNetworkIsGhostVertex(networkdm,vtx[v],&ghost);
    524:         DMNetworkGetGlobalVertexIndex(networkdm,vtx[v],&gidx);
    525:         PetscPrintf(PETSC_COMM_SELF,"[%d] subnet[%d] v %d %d; ghost %d\n",rank,i,vtx[v],gidx,ghost);
    526:       }
    527:       MPI_Barrier(PETSC_COMM_WORLD);
    528:     }
    529:     MPI_Barrier(PETSC_COMM_WORLD);

    531:     DMNetworkGetSharedVertices(networkdm,&nv,&vtx);
    532:     PetscPrintf(PETSC_COMM_SELF,"[%d] After distribute, num of shared vertices nsv = %d\n",rank,nv);
    533:     for (v=0; v<nv; v++) {
    534:       DMNetworkGetGlobalVertexIndex(networkdm,vtx[v],&gidx);
    535:       PetscPrintf(PETSC_COMM_SELF,"[%d] sv %d, gidx=%d\n",rank,vtx[v],gidx);
    536:     }
    537:     MPI_Barrier(PETSC_COMM_WORLD);
    538:   }

    540:   /* Create solution vector X */
    541:   DMCreateGlobalVector(networkdm,&X);
    542:   VecDuplicate(X,&F);
    543:   DMGetLocalVector(networkdm,&user.localXold);
    544:   PetscLogStagePop();

    546:   /* (3) Setup Solvers */
    547:   /*-------------------*/
    548:   PetscOptionsGetBool(NULL,NULL,"-viewJ",&viewJ,NULL);
    549:   PetscOptionsGetBool(NULL,NULL,"-viewX",&viewX,NULL);

    551:   PetscLogStageRegister("SNES Setup",&stage[2]);
    552:   PetscLogStagePush(stage[2]);

    554:   SetInitialGuess(networkdm,X,&user);

    556:   /* Create coupled snes */
    557:   /*-------------------- */
    558:   PetscPrintf(PETSC_COMM_WORLD,"SNES_coupled setup ......\n");
    559:   user.subsnes_id = Nsubnet;
    560:   SNESCreate(PETSC_COMM_WORLD,&snes);
    561:   SNESSetDM(snes,networkdm);
    562:   SNESSetOptionsPrefix(snes,"coupled_");
    563:   SNESSetFunction(snes,F,FormFunction,&user);
    564:   SNESMonitorSet(snes,UserMonitor,&user,NULL);
    565:   SNESSetFromOptions(snes);

    567:   if (viewJ) {
    568:     /* View Jac structure */
    569:     SNESGetJacobian(snes,&Jac,NULL,NULL,NULL);
    570:     MatView(Jac,PETSC_VIEWER_DRAW_WORLD);
    571:   }

    573:   if (viewX) {
    574:     PetscPrintf(PETSC_COMM_WORLD,"Solution:\n");
    575:     VecView(X,PETSC_VIEWER_STDOUT_WORLD);
    576:   }

    578:   if (viewJ) {
    579:     /* View assembled Jac */
    580:     MatView(Jac,PETSC_VIEWER_DRAW_WORLD);
    581:   }

    583:   /* Create snes_power */
    584:   /*-------------------*/
    585:   PetscPrintf(PETSC_COMM_WORLD,"SNES_power setup ......\n");

    587:   user.subsnes_id = 0;
    588:   SNESCreate(PETSC_COMM_WORLD,&snes_power);
    589:   SNESSetDM(snes_power,networkdm);
    590:   SNESSetOptionsPrefix(snes_power,"power_");
    591:   SNESSetFunction(snes_power,F,FormFunction,&user);
    592:   SNESMonitorSet(snes_power,UserMonitor,&user,NULL);

    594:   /* Use user-provide Jacobian */
    595:   DMCreateMatrix(networkdm,&Jac);
    596:   SNESSetJacobian(snes_power,Jac,Jac,FormJacobian_subPower,&user);
    597:   SNESSetFromOptions(snes_power);

    599:   if (viewX) {
    600:     PetscPrintf(PETSC_COMM_WORLD,"Power Solution:\n");
    601:     VecView(X,PETSC_VIEWER_STDOUT_WORLD);
    602:   }
    603:   if (viewJ) {
    604:     PetscPrintf(PETSC_COMM_WORLD,"Power Jac:\n");
    605:     SNESGetJacobian(snes_power,&Jac,NULL,NULL,NULL);
    606:     MatView(Jac,PETSC_VIEWER_DRAW_WORLD);
    607:     /* MatView(Jac,PETSC_VIEWER_STDOUT_WORLD); */
    608:   }

    610:   /* Create snes_water */
    611:   /*-------------------*/
    612:   PetscPrintf(PETSC_COMM_WORLD,"SNES_water setup......\n");

    614:   user.subsnes_id = 1;
    615:   SNESCreate(PETSC_COMM_WORLD,&snes_water);
    616:   SNESSetDM(snes_water,networkdm);
    617:   SNESSetOptionsPrefix(snes_water,"water_");
    618:   SNESSetFunction(snes_water,F,FormFunction,&user);
    619:   SNESMonitorSet(snes_water,UserMonitor,&user,NULL);
    620:   SNESSetFromOptions(snes_water);

    622:   if (viewX) {
    623:     PetscPrintf(PETSC_COMM_WORLD,"Water Solution:\n");
    624:     VecView(X,PETSC_VIEWER_STDOUT_WORLD);
    625:   }
    626:   PetscLogStagePop();

    628:   /* (4) Solve */
    629:   /*-----------*/
    630:   PetscLogStageRegister("SNES Solve",&stage[3]);
    631:   PetscLogStagePush(stage[3]);
    632:   user.it = 0;
    633:   reason  = SNES_DIVERGED_DTOL;
    634:   while (user.it < it_max && (PetscInt)reason<0) {
    635: #if 0
    636:     user.subsnes_id = 0;
    637:     SNESSolve(snes_power,NULL,X);

    639:     user.subsnes_id = 1;
    640:     SNESSolve(snes_water,NULL,X);
    641: #endif
    642:     user.subsnes_id = Nsubnet;
    643:     SNESSolve(snes,NULL,X);

    645:     SNESGetConvergedReason(snes,&reason);
    646:     user.it++;
    647:   }
    648:   PetscPrintf(PETSC_COMM_WORLD,"Coupled_SNES converged in %D iterations\n",user.it);
    649:   if (viewX) {
    650:     PetscPrintf(PETSC_COMM_WORLD,"Final Solution:\n");
    651:     VecView(X,PETSC_VIEWER_STDOUT_WORLD);
    652:   }
    653:   PetscLogStagePop();

    655:   /* Free objects */
    656:   /* -------------*/
    657:   VecDestroy(&X);
    658:   VecDestroy(&F);
    659:   DMRestoreLocalVector(networkdm,&user.localXold);

    661:   SNESDestroy(&snes);
    662:   MatDestroy(&Jac);
    663:   SNESDestroy(&snes_power);
    664:   SNESDestroy(&snes_water);

    666:   DMDestroy(&networkdm);
    667:   PetscFinalize();
    668:   return ierr;
    669: }

    671: /*TEST

    673:    build:
    674:      requires: !complex double defined(PETSC_HAVE_ATTRIBUTEALIGNED)
    675:      depends: power/PFReadData.c power/pffunctions.c water/waterreaddata.c water/waterfunctions.c

    677:    test:
    678:       args: -coupled_snes_converged_reason -options_left no -viewDM
    679:       localrunfiles: ex1options power/case9.m water/sample1.inp
    680:       output_file: output/ex1.out

    682:    test:
    683:       suffix: 2
    684:       nsize: 3
    685:       args: -coupled_snes_converged_reason -options_left no -petscpartitioner_type parmetis
    686:       localrunfiles: ex1options power/case9.m water/sample1.inp
    687:       output_file: output/ex1_2.out
    688:       requires: parmetis

    690: #   test:
    691: #      suffix: 3
    692: #      nsize: 3
    693: #      args: -coupled_snes_converged_reason -options_left no -distribute false
    694: #      localrunfiles: ex1options power/case9.m water/sample1.inp
    695: #      output_file: output/ex1_2.out

    697:    test:
    698:       suffix: 4
    699:       nsize: 4
    700:       args: -coupled_snes_converged_reason -options_left no -petscpartitioner_type simple -viewDM
    701:       localrunfiles: ex1options power/case9.m water/sample1.inp
    702:       output_file: output/ex1_4.out

    704: TEST*/