fei2dlineconst.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.
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 *  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
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 *  You should have received a copy of the GNU Lesser General Public
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 */
 
#include "fei2dlineconst.h"
#include "mathfem.h"
#include "floatmatrix.h"
#include "floatarray.h"
#include "floatarrayf.h"
#include "gaussintegrationrule.h"
 
namespace oofem {
 
 
void FEI2dLineConst :: evalN(FloatArray &answer, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const
{
    answer.resize(1);
    answer.at(1) = 1.0;
}
 
double FEI2dLineConst :: evaldNdx(FloatMatrix &answer, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const
{
    answer.clear();
    return 0.;
}
 
void FEI2dLineConst :: local2global(FloatArray &answer, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const
{
    FloatArray n(2);
    double xi = lcoords(0);
    n.at(1) = ( 1. - xi ) * 0.5;
    n.at(2) = ( 1. + xi ) * 0.5;
    answer.resize( max(xind, yind) );
    answer.zero();
    answer.at(xind) = n(0) * cellgeo.giveVertexCoordinates(1).at(xind) +
                      n(1) * cellgeo.giveVertexCoordinates(2).at(xind);
    answer.at(yind) = n(0) * cellgeo.giveVertexCoordinates(1).at(yind) +
                      n(1) * cellgeo.giveVertexCoordinates(2).at(yind);
}
 
int FEI2dLineConst :: global2local(FloatArray &answer, const FloatArray &gcoords, const FEICellGeometry &cellgeo) const
{
    double x2_x1 = cellgeo.giveVertexCoordinates(2).at(xind) - cellgeo.giveVertexCoordinates(1).at(xind);
    double y2_y1 = cellgeo.giveVertexCoordinates(2).at(yind) - cellgeo.giveVertexCoordinates(1).at(yind);
 
    // Projection of the global coordinate gives the value interpolated in [0,1].
    double dx = gcoords(0) - cellgeo.giveVertexCoordinates(1).at(xind);
    double dy = gcoords(1) - cellgeo.giveVertexCoordinates(1).at(yind);
    double xi = (x2_x1) ? ( sqrt( dx*dx*(1 + (y2_y1 / x2_x1)*(y2_y1 / x2_x1) )) ) / ( sqrt(x2_x1 * x2_x1 + y2_y1 * y2_y1) ) : sqrt(dy*dy) / ( sqrt(x2_x1 * x2_x1 + y2_y1 * y2_y1) );
    // Map to [-1,1] domain.
    xi = xi * 2 - 1;
 
    answer.resize(1);
    answer(0) = clamp(xi, -1., 1.);
    return false;
}
 
void FEI2dLineConst :: edgeEvaldNds(FloatArray &answer, int iedge,
                                  const FloatArray &lcoords, const FEICellGeometry &cellgeo) const
{
    answer.resize(1);
    answer.zero();
}
 
double FEI2dLineConst :: edgeEvalNormal(FloatArray &normal, int iedge, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const
{
    normal.resize(2);
    normal.at(1) = cellgeo.giveVertexCoordinates(2).at(yind) - cellgeo.giveVertexCoordinates(1).at(yind);
    normal.at(2) = -( cellgeo.giveVertexCoordinates(2).at(xind) - cellgeo.giveVertexCoordinates(1).at(xind) );
    return normal.normalize_giveNorm() * 0.5;
}
 
double FEI2dLineConst :: giveTransformationJacobian(const FloatArray &lcoords, const FEICellGeometry &cellgeo) const
{
    double x2_x1 = cellgeo.giveVertexCoordinates(2).at(xind) - cellgeo.giveVertexCoordinates(1).at(xind);
    double y2_y1 = cellgeo.giveVertexCoordinates(2).at(yind) - cellgeo.giveVertexCoordinates(1).at(yind);
    return sqrt(x2_x1 * x2_x1 + y2_y1 * y2_y1) / 2.0;
}
 
IntArray FEI2dLineConst :: boundaryEdgeGiveNodes(int boundary, Element_Geometry_Type egt, bool includeHierarchical) const
{
    return {1, 2};
}
 
IntArray FEI2dLineConst :: computeLocalEdgeMapping(int iedge) const
{
    if ( iedge != 1 ) {
        OOFEM_ERROR("wrong egde number (%d)", iedge);
    }
 
    return {1, 2};
}
 
void FEI2dLineConst :: edgeEvalN(FloatArray &answer, int iedge, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const
{
    this->evalN(answer, lcoords, cellgeo);
}
 
double FEI2dLineConst :: edgeComputeLength(const IntArray &edgeNodes, const FEICellGeometry &cellgeo) const
{
    double x2_x1 = cellgeo.giveVertexCoordinates(2).at(xind) - cellgeo.giveVertexCoordinates(1).at(xind);
    double y2_y1 = cellgeo.giveVertexCoordinates(2).at(yind) - cellgeo.giveVertexCoordinates(1).at(yind);
    return sqrt(x2_x1 * x2_x1 + y2_y1 * y2_y1);
}
 
double FEI2dLineConst :: evalNXIntegral(int iEdge, const FEICellGeometry &cellgeo) const
{
    const auto &node1 = cellgeo.giveVertexCoordinates(1);
    double x1 = node1.at(xind);
    double y1 = node1.at(yind);
 
    const auto &node2 = cellgeo.giveVertexCoordinates(2);
    double x2 = node2.at(xind);
    double y2 = node2.at(yind);
 
    return x2 * y1 - x1 * y2;
}
 
std::unique_ptr<IntegrationRule> FEI2dLineConst :: giveIntegrationRule(int order, Element_Geometry_Type egt) const
{
    auto iRule = std::make_unique<GaussIntegrationRule>(1, nullptr);
    int points = iRule->getRequiredNumberOfIntegrationPoints(_Line, order + 0);
    iRule->SetUpPointsOnLine(points, _Unknown);
    return std::move(iRule);
}
} // end namespace oofem