termlibrary4.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 "mpm.h"
#include "termlibrary4.h"
#include "element.h"
#include "mathfem.h"
#include "field.h"
 
namespace oofem {
 
NTN::NTN (const Variable *testField, const Variable* unknownField) : Term(testField, unknownField) {}
 
void NTN::evaluate_lin (FloatMatrix& answer, MPElement& e, GaussPoint* gp, TimeStep* tstep) const  {
    FloatArray Np;
    this->field->interpolation->evalN(Np, gp->giveNaturalCoordinates(), FEIElementGeometryWrapper(&e));
    answer.beDyadicProductOf(Np, Np);
}
 
void NTN::evaluate (FloatArray& answer, MPElement& cell, GaussPoint* gp, TimeStep* tstep) const  {
    FloatArray p;
    FloatMatrix S;
    cell.getUnknownVector(p, this->field, VM_Velocity, tstep);
    this->evaluate_lin (S, cell,gp, tstep);
    answer.beProductOf(S,p);
}
 
void NTN::getDimensions(Element& cell) const  {
    //int nnodes = interpol.giveNumberOfNodes();
    //int ndofs = v.size;
    //return nnodes*ndofs;
}
void NTN::initializeCell(Element& cell) const  {}
 
 
dnTaN::dnTaN (const Variable *testField, const Variable* unknownField, FieldPtr velocity) : Term(testField, unknownField), velocity(velocity) {}
 
void dnTaN::evaluate_lin (FloatMatrix& answer, MPElement& e, GaussPoint* gp, TimeStep* tstep) const  {
    FloatArray n, gc,lc,a;
    FloatMatrix dndx;
    this->testField->interpolation->evaldNdx(dndx, gp->giveNaturalCoordinates(), FEIElementGeometryWrapper(&e));
    this->field->interpolation->evalN(n, gp->giveNaturalCoordinates(), FEIElementGeometryWrapper(&e));
    FloatMatrix nm=FloatMatrix::fromArray(n, true), anm;
    int nsd = this->field->interpolation->giveNsd(e.giveGeometryType());
    FloatMatrix am(nsd,1);
    //a.at(2,1)=1.0; // assume 2d flow for now
    //a.at(1,1)=sqrt(0.5); a.at(2,1)=sqrt(0.5); 
    lc = gp->giveNaturalCoordinates();
    e.getGeometryInterpolation()->local2global(gc, lc, FEIElementGeometryWrapper(&e));
    this->velocity->evaluateAt(a, gc, VM_Total, tstep);
    for (int i=1; i<=nsd; i++) {
        am.at(i,1)=a.at(i);
    }
    anm.beProductOf(FloatMatrix::fromArray(a), nm);
    answer.beProductOf(dndx, anm);
}
 
void dnTaN::evaluate (FloatArray& answer, MPElement& cell, GaussPoint* gp, TimeStep* tstep) const  {
    FloatArray p;
    FloatMatrix S;
    cell.getUnknownVector(p, this->field, VM_Velocity, tstep);
    this->evaluate_lin (S, cell,gp, tstep);
    answer.beProductOf(S,p);
}
 
void dnTaN::getDimensions(Element& cell) const  {
    //int nnodes = interpol.giveNumberOfNodes();
    //int ndofs = v.size;
    //return nnodes*ndofs;
}
void dnTaN::initializeCell(Element& cell) const  {}
 
 
 
 
 
 
 
} // end namespace oofem