PABLO_example_00002.cpp

2D adaptive mesh refinement (AMR) using PABLO

2D adaptive mesh refinement (AMR) using PABLOThis example creates a 2D Octree mesh on the square domain [0,1]x[0,1].

In this example the domain is iteratively refined using a slight modification of the first refinement criterion of PABLO_example_00001.

Here, each octant is marked for further refinement if at least one of its vertices lies within a circle of specified radius. Again the iterative refinement is performed for a specified number of iterations.

Using the present criterion the geometry is captured better than in example PABLO_example_00001.

Then a global coarsening iteration is performed, followed by an iterative coarsening of each quadrant within a smaller circle inside the original geometry. The coarsening procedure is repeated 5 times and the 2:1 balancing option is de-activated.

To run: ./PABLO_example_00002
To see the result visit: PABLO website

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 *  License for more details.
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#if BITPIT_ENABLE_MPI==1
#include <mpi.h>
#endif
 
#include "bitpit_PABLO.hpp"
 
using namespace std;
using namespace bitpit;
 
// =================================================================================== //
// =================================================================================== //
 
void run()
{
    int iter = 0;
 
    PabloUniform pablo2(2);
 
    uint32_t idx=0;
    pablo2.setBalance(idx,true);
 
    pablo2.computeConnectivity();
    pablo2.write("pablo00002_iter"+to_string(static_cast<unsigned long long>(iter)));
 
    for (iter=1; iter<3; iter++){
        pablo2.adaptGlobalRefine();
        pablo2.updateConnectivity();
        pablo2.write("pablo00002_iter"+to_string(static_cast<unsigned long long>(iter)));
    }
 
    double xc, yc;
    xc = yc = 0.5;
    double radius = 0.4;
 
    for (iter=3; iter<9; iter++){
        uint32_t nocts = pablo2.getNumOctants();
        for (unsigned int i=0; i<nocts; i++){
            vector<array<double,3> > nodes = pablo2.getNodes(i);
            for (int j=0; j<4; j++){
                double x = nodes[j][0];
                double y = nodes[j][1];
                if ((pow((x-xc),2.0)+pow((y-yc),2.0) <= pow(radius,2.0))){
                    pablo2.setMarker(i, 1);
                }
            }
        }
        pablo2.adapt();
 
        pablo2.updateConnectivity();
        pablo2.write("pablo00002_iter"+to_string(static_cast<unsigned long long>(iter)));
    }
 
    pablo2.adaptGlobalCoarse();
    pablo2.updateConnectivity();
    pablo2.write("pablo00002_iter"+to_string(static_cast<unsigned long long>(iter)));
 
 
    xc = yc = 0.35;
    radius = 0.15;
 
    for (iter=10; iter<15; iter++){
        uint32_t nocts = pablo2.getNumOctants();
        for (unsigned int i=0; i<nocts; i++){
            vector<array<double,3> > nodes = pablo2.getNodes(i);
            for (int j=0; j<4; j++){
                double x = nodes[j][0];
                double y = nodes[j][1];
                if ((pow((x-xc),2.0)+pow((y-yc),2.0) <= pow(radius,2.0))){
                    pablo2.setMarker(i, -1);
                }
            }
        }
        pablo2.adapt();
        pablo2.updateConnectivity();
        pablo2.write("pablo00002_iter"+to_string(static_cast<unsigned long long>(iter)));
    }
}
 
int main(int argc, char *argv[])
{
#if BITPIT_ENABLE_MPI==1
    MPI_Init(&argc,&argv);
#else
    BITPIT_UNUSED(argc);
    BITPIT_UNUSED(argv);
#endif
 
    int nProcs;
    int rank;
#if BITPIT_ENABLE_MPI==1
    MPI_Comm_size(MPI_COMM_WORLD, &nProcs);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
#else
    nProcs = 1;
    rank   = 0;
#endif
 
    // Initialize the logger
    log::manager().initialize(log::MODE_SEPARATE, false, nProcs, rank);
    log::cout() << log::fileVerbosity(log::LEVEL_INFO);
    log::cout() << log::disableConsole();
 
    // Run the example
    try {
        run();
    } catch (const std::exception &exception) {
        log::cout() << exception.what();
        exit(1);
    }
 
#if BITPIT_ENABLE_MPI==1
    MPI_Finalize();
#endif
}