PetscErrorCode SNESSetFromOptions_NGS(SNES snes)
{
SNES_NGS *gs = (SNES_NGS*)snes->data;
PetscErrorCode ierr;
PetscInt sweeps,max_its=PETSC_DEFAULT;
PetscReal rtol=PETSC_DEFAULT,atol=PETSC_DEFAULT,stol=PETSC_DEFAULT;
PetscBool flg,flg1,flg2,flg3;
PetscFunctionBegin;
ierr = PetscOptionsHead("SNES GS options");CHKERRQ(ierr);
/* GS Options */
ierr = PetscOptionsInt("-snes_ngs_sweeps","Number of sweeps of GS to apply","SNESComputeGS",gs->sweeps,&sweeps,&flg);CHKERRQ(ierr);
if (flg) {
ierr = SNESNGSSetSweeps(snes,sweeps);CHKERRQ(ierr);
}
ierr = PetscOptionsReal("-snes_ngs_atol","Number of sweeps of GS to apply","SNESComputeGS",gs->abstol,&atol,&flg);CHKERRQ(ierr);
ierr = PetscOptionsReal("-snes_ngs_rtol","Number of sweeps of GS to apply","SNESComputeGS",gs->rtol,&rtol,&flg1);CHKERRQ(ierr);
ierr = PetscOptionsReal("-snes_ngs_stol","Number of sweeps of GS to apply","SNESComputeGS",gs->stol,&stol,&flg2);CHKERRQ(ierr);
ierr = PetscOptionsInt("-snes_ngs_max_it","Number of sweeps of GS to apply","SNESComputeGS",gs->max_its,&max_its,&flg3);CHKERRQ(ierr);
if (flg || flg1 || flg2 || flg3) {
ierr = SNESNGSSetTolerances(snes,atol,rtol,stol,max_its);CHKERRQ(ierr);
}
flg = PETSC_FALSE;
ierr = PetscOptionsBool("-snes_ngs_secant","Use pointwise secant local Jacobian approximation","",flg,&flg,NULL);CHKERRQ(ierr);
if (flg) {
ierr = SNESSetNGS(snes,SNESComputeNGSDefaultSecant,NULL);CHKERRQ(ierr);
ierr = PetscInfo(snes,"Setting default finite difference coloring Jacobian matrix\n");CHKERRQ(ierr);
}
ierr = PetscOptionsReal("-snes_ngs_secant_h","Differencing parameter for secant search","",gs->h,&gs->h,NULL);CHKERRQ(ierr);
ierr = PetscOptionsBool("-snes_ngs_secant_mat_coloring","Use the Jacobian coloring for the secant GS","",gs->secant_mat,&gs->secant_mat,&flg);CHKERRQ(ierr);
ierr = PetscOptionsTail();CHKERRQ(ierr);
PetscFunctionReturn(0);
}
PetscErrorCode SNESSetUp_NGS(SNES snes)
{
PetscErrorCode ierr;
PetscErrorCode (*f)(SNES,Vec,Vec,void*);
PetscFunctionBegin;
ierr = SNESGetNGS(snes,&f,NULL);CHKERRQ(ierr);
if (!f) {
ierr = SNESSetNGS(snes,SNESComputeNGSDefaultSecant,NULL);CHKERRQ(ierr);
}
PetscFunctionReturn(0);
}
int main(int argc,char **argv)
{
AppCtx user; /* user-defined work context */
PetscInt mx,my,its;
PetscErrorCode ierr;
MPI_Comm comm;
SNES snes;
DM da;
Vec x,X,b;
PetscBool youngflg,poissonflg,muflg,lambdaflg,view=PETSC_FALSE,viewline=PETSC_FALSE;
PetscReal poisson=0.2,young=4e4;
char filename[PETSC_MAX_PATH_LEN] = "ex16.vts";
char filename_def[PETSC_MAX_PATH_LEN] = "ex16_def.vts";
ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
ierr = FormElements();CHKERRQ(ierr);
comm = PETSC_COMM_WORLD;
ierr = SNESCreate(comm,&snes);CHKERRQ(ierr);
ierr = DMDACreate3d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,11,2,2,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,3,1,NULL,NULL,NULL,&da);CHKERRQ(ierr);
ierr = DMSetFromOptions(da);CHKERRQ(ierr);
ierr = DMSetUp(da);CHKERRQ(ierr);
ierr = SNESSetDM(snes,(DM)da);CHKERRQ(ierr);
ierr = SNESSetNGS(snes,NonlinearGS,&user);CHKERRQ(ierr);
ierr = DMDAGetInfo(da,0,&mx,&my,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE);CHKERRQ(ierr);
user.loading = 0.0;
user.arc = PETSC_PI/3.;
user.mu = 4.0;
user.lambda = 1.0;
user.rad = 100.0;
user.height = 3.;
user.width = 1.;
user.ploading = -5e3;
ierr = PetscOptionsGetReal(NULL,NULL,"-arc",&user.arc,NULL);CHKERRQ(ierr);
ierr = PetscOptionsGetReal(NULL,NULL,"-mu",&user.mu,&muflg);CHKERRQ(ierr);
ierr = PetscOptionsGetReal(NULL,NULL,"-lambda",&user.lambda,&lambdaflg);CHKERRQ(ierr);
ierr = PetscOptionsGetReal(NULL,NULL,"-rad",&user.rad,NULL);CHKERRQ(ierr);
ierr = PetscOptionsGetReal(NULL,NULL,"-height",&user.height,NULL);CHKERRQ(ierr);
ierr = PetscOptionsGetReal(NULL,NULL,"-width",&user.width,NULL);CHKERRQ(ierr);
ierr = PetscOptionsGetReal(NULL,NULL,"-loading",&user.loading,NULL);CHKERRQ(ierr);
ierr = PetscOptionsGetReal(NULL,NULL,"-ploading",&user.ploading,NULL);CHKERRQ(ierr);
ierr = PetscOptionsGetReal(NULL,NULL,"-poisson",&poisson,&poissonflg);CHKERRQ(ierr);
ierr = PetscOptionsGetReal(NULL,NULL,"-young",&young,&youngflg);CHKERRQ(ierr);
if ((youngflg || poissonflg) || !(muflg || lambdaflg)) {
/* set the lame' parameters based upon the poisson ratio and young's modulus */
user.lambda = poisson*young / ((1. + poisson)*(1. - 2.*poisson));
user.mu = young/(2.*(1. + poisson));
}
ierr = PetscOptionsGetBool(NULL,NULL,"-view",&view,NULL);CHKERRQ(ierr);
ierr = PetscOptionsGetBool(NULL,NULL,"-view_line",&viewline,NULL);CHKERRQ(ierr);
ierr = DMDASetFieldName(da,0,"x_disp");CHKERRQ(ierr);
ierr = DMDASetFieldName(da,1,"y_disp");CHKERRQ(ierr);
ierr = DMDASetFieldName(da,2,"z_disp");CHKERRQ(ierr);
ierr = DMSetApplicationContext(da,&user);CHKERRQ(ierr);
ierr = DMDASNESSetFunctionLocal(da,INSERT_VALUES,(PetscErrorCode (*)(DMDALocalInfo*,void*,void*,void*))FormFunctionLocal,&user);CHKERRQ(ierr);
ierr = DMDASNESSetJacobianLocal(da,(DMDASNESJacobian)FormJacobianLocal,&user);CHKERRQ(ierr);
ierr = SNESSetFromOptions(snes);CHKERRQ(ierr);
ierr = FormCoordinates(da,&user);CHKERRQ(ierr);
ierr = DMCreateGlobalVector(da,&x);CHKERRQ(ierr);
ierr = DMCreateGlobalVector(da,&b);CHKERRQ(ierr);
ierr = InitialGuess(da,&user,x);CHKERRQ(ierr);
ierr = FormRHS(da,&user,b);CHKERRQ(ierr);
ierr = PetscPrintf(comm,"lambda: %f mu: %f\n",(double)user.lambda,(double)user.mu);CHKERRQ(ierr);
/* show a cross-section of the initial state */
if (viewline) {
ierr = DisplayLine(snes,x);CHKERRQ(ierr);
}
/* get the loaded configuration */
ierr = SNESSolve(snes,b,x);CHKERRQ(ierr);
ierr = SNESGetIterationNumber(snes,&its);CHKERRQ(ierr);
ierr = PetscPrintf(comm,"Number of SNES iterations = %D\n", its);CHKERRQ(ierr);
ierr = SNESGetSolution(snes,&X);CHKERRQ(ierr);
/* show a cross-section of the final state */
if (viewline) {
ierr = DisplayLine(snes,X);CHKERRQ(ierr);
}
if (view) {
PetscViewer viewer;
Vec coords;
ierr = PetscViewerVTKOpen(PETSC_COMM_WORLD,filename,FILE_MODE_WRITE,&viewer);CHKERRQ(ierr);
ierr = VecView(x,viewer);CHKERRQ(ierr);
ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr);
ierr = DMGetCoordinates(da,&coords);CHKERRQ(ierr);
ierr = VecAXPY(coords,1.0,x);CHKERRQ(ierr);
ierr = PetscViewerVTKOpen(PETSC_COMM_WORLD,filename_def,FILE_MODE_WRITE,&viewer);CHKERRQ(ierr);
ierr = VecView(x,viewer);CHKERRQ(ierr);
ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr);
}
ierr = VecDestroy(&x);CHKERRQ(ierr);
ierr = VecDestroy(&b);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = SNESDestroy(&snes);CHKERRQ(ierr);
ierr = PetscFinalize();
return ierr;
}
