neumannmomentload.C

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/*
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 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#include "neumannmomentload.h"
#include "classfactory.h"
#include "function.h"
#include "inputrecord.h"
#include "domain.h"
#include "set.h"
#include "element.h"
#include "feinterpol.h"
#include "gausspoint.h"
#include "timestep.h"
#include "mathfem.h"
 
 
namespace oofem {
REGISTER_BoundaryCondition(NeumannMomentLoad);
 
void
NeumannMomentLoad :: initializeFrom(InputRecord &ir)
{
    BoundaryLoad :: initializeFrom(ir);
 
    IR_GIVE_FIELD(ir, g, _IFT_NeumannMomentLoad_Gradient);
    p = 0.;
    IR_GIVE_OPTIONAL_FIELD(ir, p, _IFT_NeumannMomentLoad_Constant);
    IR_GIVE_FIELD(ir, cset, _IFT_NeumannMomentLoad_CenterSet);
 
    xbar.resize(0);
}
 
void
NeumannMomentLoad :: computeXbar()
{
 
    xbar.resize(this->giveDomain()->giveNumberOfSpatialDimensions());
    xbar.zero();
 
    celements = this->giveDomain()->giveSet(cset)->giveElementList();
 
    double V = 0.0;
 
    for ( auto elementID : celements ) {
 
        Element *thisElement = this->giveDomain()->giveElement(elementID);
        FEInterpolation *i = thisElement->giveInterpolation();
 
        auto iRule = i->giveIntegrationRule(3, thisElement->giveGeometryType() );
 
        FloatArray coord;
        for ( auto &gp: *iRule ) {
            FloatArray lcoords = gp->giveNaturalCoordinates();
            double detJ = i->giveTransformationJacobian(lcoords, FEIElementGeometryWrapper(thisElement));
 
            i->local2global(coord, lcoords, FEIElementGeometryWrapper(thisElement));
            coord.times(gp->giveWeight()*fabs(detJ));
 
            V += gp->giveWeight()*fabs(detJ);
 
            xbar.add(coord);
        }
    }
    xbar.times(1.0/V);
}
 
void
NeumannMomentLoad :: computeValueAt(FloatArray &answer, TimeStep *tStep, const FloatArray &coords, ValueModeType mode)
{
    // we overload general implementation on the boundary load level due
    // to implementation efficiency
 
    computeXbar();
 
    //double factor;
 
    if ( ( mode != VM_Total ) && ( mode != VM_Incremental ) ) {
        OOFEM_ERROR("mode not supported");
    }
 
    OOFEM_ERROR("Should not happen!");
/*
    factor = this->giveTimeFunction()->evaluate(tStep, mode);
    answer = componentArray;
    answer.times(factor);
*/
}
 
void
NeumannMomentLoad :: computeNormal(FloatArray &answer, Element *e, int side)
{
 
    FloatArray xi;
 
    if ( this->domain->giveNumberOfSpatialDimensions() == 3 ) {
        xi.resize(2);
        xi(0) = 0.25;
        xi(1) = 0.25;
    } else {
        xi.resize(1);
        xi(0) = 0.5;
    }
 
    FEInterpolation *interpolation = e->giveInterpolation();
 
    interpolation->boundaryEvalNormal( answer, side, xi, FEIElementGeometryWrapper(e) );
}
 
void
NeumannMomentLoad :: computeValueAtBoundary(FloatArray &answer, TimeStep *tStep, const FloatArray &coords, ValueModeType mode, Element *e, int boundary)
{
    computeXbar();
 
    FEInterpolation *interpolation = e->giveInterpolation();
 
    // Compute normal
    FloatArray Normal, lcoords;
    interpolation->global2local(lcoords, coords, FEIElementGeometryWrapper(e));
    interpolation->boundaryEvalNormal( Normal, boundary, lcoords, FEIElementGeometryWrapper(e) );
 
    // Compute x in current configuration
    FloatArray u;
    IntArray bNodes;
 
    FloatArray xdiff = coords-xbar;;
 
    double l = p+g.dotProduct(xdiff);
 
    answer = l*Normal;
 
    // Finally, compute value of loadtimefunction
    double factor;
    factor = this->giveTimeFunction()->evaluate(tStep, mode);
    answer=answer*factor;
 
}
 
}