intx_mpas.cpp

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/*
 * mpas file test
 *
 *  Created on: Feb 12, 2013
 */

// copy from case1 test
#include "moab/MOABConfig.h"

#ifdef MOAB_HAVE_ZOLTAN

#include <iostream>
#include <sstream>
#include <ctime>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <cmath>  // for M_PI
#include <ctime>
#include "moab/Core.hpp"
#include "moab/Interface.hpp"
#include "moab/IntxMesh/Intx2MeshOnSphere.hpp"
#include "moab/ProgOptions.hpp"
#include "MBTagConventions.hpp"
#include "moab/ParallelComm.hpp"
#include "moab/IntxMesh/IntxUtils.hpp"
#include "IntxUtilsCSLAM.hpp"
#include "TestUtil.hpp"

using namespace moab;
// some input data
double gtol = 1.e-9;  // this is for geometry tolerance

double radius = 1.;  // in m:  6371220.

double t = 0.1, delta_t = 0.05;  // check the script
bool Verbose = false;
double rot   = M_PI / 10;

ErrorCode manufacture_lagrange_mesh_on_sphere( Interface* mb, EntityHandle euler_set )
{
    ErrorCode rval = MB_SUCCESS;

    /*
     * get all plys first, then vertices, then move them on the surface of the sphere
     *  radius is 1., most of the time
     *
     */
    Range polygons;
    rval = mb->get_entities_by_dimension( euler_set, 2, polygons );CHECK_ERR( rval );

    Range connecVerts;
    rval = mb->get_connectivity( polygons, connecVerts );CHECK_ERR( rval );

    Tag tagh = 0;
    std::string tag_name( "DP" );
    rval = mb->tag_get_handle( tag_name.c_str(), 3, MB_TYPE_DOUBLE, tagh, MB_TAG_DENSE | MB_TAG_CREAT );CHECK_ERR( rval );
    void* data;  // pointer to the LOC in memory, for each vertex
    int count;

    rval = mb->tag_iterate( tagh, connecVerts.begin(), connecVerts.end(), count, data );CHECK_ERR( rval );
    // here we are checking contiguity
    assert( count == (int)connecVerts.size() );
    double* ptr_DP = (double*)data;
    // get the coordinates of the old mesh, and move it around the sphere in the same way as in the
    // python script

    // now put the vertices in the right place....
    // int vix=0; // vertex index in new array
    double T = 5;  // check the script

    for( Range::iterator vit = connecVerts.begin(); vit != connecVerts.end(); ++vit )
    {
        EntityHandle oldV = *vit;
        CartVect posi;
        rval = mb->get_coords( &oldV, 1, &( posi[0] ) );CHECK_ERR( rval );
        // do some mumbo jumbo, as in python script
        IntxUtils::SphereCoords sphCoord = IntxUtils::cart_to_spherical( posi );
        double lat1                      = sphCoord.lat - 2 * M_PI * t / T;  // 0.1/5
        double uu = 3 * radius / T * pow( sin( lat1 ), 2 ) * sin( 2 * sphCoord.lon ) * cos( M_PI * t / T );
        uu += 2 * radius * M_PI * cos( sphCoord.lon ) / T;
        double vv = 3 * radius / T * ( sin( 2 * lat1 ) ) * cos( sphCoord.lon ) * cos( M_PI * t / T );
        double vx = -uu * sin( sphCoord.lon ) - vv * sin( sphCoord.lat ) * cos( sphCoord.lon );
        double vy = -uu * cos( sphCoord.lon ) - vv * sin( sphCoord.lat ) * sin( sphCoord.lon );
        double vz = vv * cos( sphCoord.lat );
        posi      = posi + delta_t * CartVect( vx, vy, vz );
        double x2 = posi[0] * cos( rot ) - posi[1] * sin( rot );
        double y2 = posi[0] * sin( rot ) + posi[1] * cos( rot );
        CartVect newPos( x2, y2, posi[2] );
        double len1 = newPos.length();
        newPos      = radius * newPos / len1;

        ptr_DP[0] = newPos[0];
        ptr_DP[1] = newPos[1];
        ptr_DP[2] = newPos[2];
        ptr_DP += 3;  // increment to the next node
    }
    return rval;
}

int main( int argc, char** argv )
{

    MPI_Init( &argc, &argv );

    std::string extra_read_opts;
    std::string fileN          = TestDir + "unittest/io/mpasx1.642.t.2.nc";
    const char* filename_mesh1 = fileN.c_str();
    bool flux_form             = false;
    if( argc > 1 )
    {
        int index = 1;
        while( index < argc )
        {
            if( !strcmp( argv[index], "-gtol" ) )  // this is for geometry tolerance
            {
                gtol = atof( argv[++index] );
            }
            if( !strcmp( argv[index], "-dt" ) )
            {
                delta_t = atof( argv[++index] );
            }
            if( !strcmp( argv[index], "-input" ) )
            {
                filename_mesh1 = argv[++index];
            }
            if( !strcmp( argv[index], "-R" ) )
            {
                radius = atof( argv[++index] );
            }
            if( !strcmp( argv[index], "-O" ) )
            {
                extra_read_opts = std::string( argv[++index] );
            }
            if( !strcmp( argv[index], "-FF" ) )
            {
                flux_form = true;
            }
            if( !strcmp( argv[index], "-v" ) )
            {
                Verbose = true;
            }
            if( !strcmp( argv[index], "-t" ) )
            {
                t = atof( argv[++index] );
            }
            if( !strcmp( argv[index], "-t" ) )
            {
                t = atof( argv[++index] );
            }
            if( !strcmp( argv[index], "-rot" ) )
            {
                rot = atof( argv[++index] );
                rot = M_PI / rot;  // so rot 50 means rotate with M_PI/50 radians
            }

            index++;
        }
    }
    // start copy
    std::string opts = std::string( "PARALLEL=READ_PART;PARTITION_METHOD=RCBZOLTAN" ) +
                       std::string( ";PARALLEL_RESOLVE_SHARED_ENTS;VARIABLE=;NO_EDGES;" ) + extra_read_opts;
    Core moab;
    Interface& mb = moab;
    EntityHandle euler_set;
    ErrorCode rval;
    rval = mb.create_meshset( MESHSET_SET, euler_set );CHECK_ERR( rval );

    clock_t tt = clock();

    rval = mb.load_file( filename_mesh1, &euler_set, opts.c_str() );CHECK_ERR( rval );

    ParallelComm* pcomm = ParallelComm::get_pcomm( &mb, 0 );CHECK_ERR( rval );

    /*rval = pcomm->check_all_shared_handles();CHECK_ERR(rval);*/
    // end copy
    int rank  = pcomm->proc_config().proc_rank();
    int procs = pcomm->proc_config().proc_size();

    if( 0 == rank )
        std::cout << " case 1: use -gtol " << gtol << " -dt " << delta_t << " -R " << radius << " -input "
                  << filename_mesh1 << " -t " << t << " -rot " << rot << "\n";

    if( 0 == rank )
    {
        std::cout << "load mesh from " << filename_mesh1 << "\n  on " << procs << " processors in "
                  << ( clock() - tt ) / (double)CLOCKS_PER_SEC << " seconds" << std::endl;
        tt = clock();
    }

    rval = manufacture_lagrange_mesh_on_sphere( &mb, euler_set );CHECK_ERR( rval );

    // create a set with quads corresponding to each initial edge spanned with the displacement
    // field
    if( flux_form )
    {
        rval = IntxUtilsCSLAM::create_span_quads( &mb, euler_set, rank );CHECK_ERR( rval );
    }

    EntityHandle covering_lagr_set;
    rval = mb.create_meshset( MESHSET_SET, covering_lagr_set );CHECK_ERR( rval );

    Intx2MeshOnSphere worker( &mb );
    // double radius = 1.; // input
    worker.set_radius_source_mesh( radius );
    worker.set_radius_destination_mesh( radius );
    worker.set_parallel_comm( pcomm );
    if( 0 == rank )
    {
        std::cout << "manufacture departure mesh " << filename_mesh1 << "\n  on " << procs << " processors in "
                  << ( clock() - tt ) / (double)CLOCKS_PER_SEC << " seconds" << std::endl;
        tt = clock();
    }
    rval = worker.FindMaxEdges( euler_set, euler_set );CHECK_ERR( rval );
    worker.set_error_tolerance( gtol );

    rval = worker.create_departure_mesh_2nd_alg( euler_set, covering_lagr_set );CHECK_ERR( rval );

    if( 0 == rank )
    {
        std::cout << "communicate covering mesh on " << procs << " processors in "
                  << ( clock() - tt ) / (double)CLOCKS_PER_SEC << " seconds" << std::endl;
        tt = clock();
    }

    if( Verbose )
    {
        std::stringstream lagrIni;
        lagrIni << "lagr0" << rank << ".h5m";
        rval = mb.write_file( lagrIni.str().c_str(), 0, 0, &covering_lagr_set, 1 );
    }

    rval = IntxUtils::enforce_convexity( &mb, covering_lagr_set, rank );CHECK_ERR( rval );
    if( Verbose )
    {
        std::stringstream ste;
        ste << "euler0" << rank << ".h5m";
        rval = mb.write_file( ste.str().c_str(), 0, 0, &euler_set, 1 );
    }

    if( MB_SUCCESS != rval ) std::cout << "can't write lagr set\n";

    EntityHandle outputSet;
    rval = mb.create_meshset( MESHSET_SET, outputSet );CHECK_ERR( rval );
    rval = worker.intersect_meshes( covering_lagr_set, euler_set, outputSet );CHECK_ERR( rval );

    if( 0 == rank )
    {
        std::cout << "intersect meshes in " << procs << " processors in " << ( clock() - tt ) / (double)CLOCKS_PER_SEC
                  << " seconds" << std::endl;
        tt = clock();
    }
    if( Verbose && rank <= 4 )
    {
        std::string opts_write( "" );
        std::stringstream outf;
        outf << "intersect0" << rank << ".h5m";
        rval = mb.write_file( outf.str().c_str(), 0, 0, &outputSet, 1 );
        if( MB_SUCCESS != rval ) std::cout << "can't write output\n";
    }

    if( rank <= 4 )
    {
        moab::IntxAreaUtils areaAdaptor;
        double intx_area    = areaAdaptor.area_on_sphere( &mb, outputSet, radius, rank );
        double arrival_area = areaAdaptor.area_on_sphere( &mb, euler_set, radius, rank );
        std::cout << "On proc " << rank << "  arrival area: " << arrival_area << "  intersection area:" << intx_area
                  << " rel error: " << fabs( ( intx_area - arrival_area ) / arrival_area ) << "\n";
    }

    MPI_Finalize();
    if( MB_SUCCESS != rval ) return 1;

    return 0;
}

#else

int main( int /*argc*/, char** /*argv*/ )
{
    return 0;
}

#endif