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ElementQuad4.cpp
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Fri, May 31, 09:23

ElementQuad4.cpp
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#include "support.h"
// =================================================================================================
TEST_CASE("GooseFEM::ElementQuad4", "ElementQuad4.h")
{
using T2 = xt::xtensor_fixed<double, xt::xshape<2,2>>;
// =================================================================================================
SECTION("dV - Gauss")
{
GooseFEM::Mesh::Quad4::Regular mesh(2,2);
xt::xtensor<double,2> coor = mesh.coor();
xt::xtensor<size_t,1> top = mesh.nodesTopEdge();
xt::xtensor<size_t,1> right = mesh.nodesRightEdge();
xt::view(coor, xt::keep(top), xt::keep(1)) += 1.;
xt::view(coor, xt::keep(right), xt::keep(0)) += 1.;
GooseFEM::Vector vec(mesh.conn(), mesh.dofs());
GooseFEM::Element::Quad4::Quadrature quad(vec.AsElement(coor));
xt::xtensor<double,2> dV = quad.DV();
xt::xtensor<double,4> dV_tensor = quad.DV(2);
REQUIRE(xt::allclose(xt::view(dV, xt::keep(0)), 1./4.));
REQUIRE(xt::allclose(xt::view(dV, xt::keep(1)), 2./4.));
REQUIRE(xt::allclose(xt::view(dV, xt::keep(2)), 2./4.));
REQUIRE(xt::allclose(xt::view(dV, xt::keep(3)), 4./4.));
for (size_t e = 0; e < mesh.nelem(); ++e)
for (size_t q = 0; q < quad.nip(); ++q)
REQUIRE(xt::allclose(xt::view(dV_tensor, xt::keep(e), xt::keep(q)), dV(e,q)));
}
// =================================================================================================
SECTION("dV - Nodal")
{
GooseFEM::Mesh::Quad4::Regular mesh(2,2);
xt::xtensor<double,2> coor = mesh.coor();
xt::xtensor<size_t,1> top = mesh.nodesTopEdge();
xt::xtensor<size_t,1> right = mesh.nodesRightEdge();
xt::view(coor, xt::keep(top), xt::keep(1)) += 1.;
xt::view(coor, xt::keep(right), xt::keep(0)) += 1.;
GooseFEM::Vector vec(mesh.conn(), mesh.dofs());
GooseFEM::Element::Quad4::Quadrature quad(
vec.AsElement(coor),
GooseFEM::Element::Quad4::Nodal::xi(),
GooseFEM::Element::Quad4::Nodal::w());
xt::xtensor<double,2> dV = quad.DV();
xt::xtensor<double,4> dV_tensor = quad.DV(2);
REQUIRE(xt::allclose(xt::view(dV, xt::keep(0)), 1./4.));
REQUIRE(xt::allclose(xt::view(dV, xt::keep(1)), 2./4.));
REQUIRE(xt::allclose(xt::view(dV, xt::keep(2)), 2./4.));
REQUIRE(xt::allclose(xt::view(dV, xt::keep(3)), 4./4.));
for (size_t e = 0; e < mesh.nelem(); ++e)
for (size_t q = 0; q < quad.nip(); ++q)
REQUIRE(xt::allclose(xt::view(dV_tensor, xt::keep(e), xt::keep(q)), dV(e,q)));
}
// =================================================================================================
SECTION("int_N_scalar_NT_dV")
{
GooseFEM::Mesh::Quad4::Regular mesh(3,3);
GooseFEM::Vector vec(mesh.conn(), mesh.dofsPeriodic());
GooseFEM::MatrixDiagonal mat(mesh.conn(), mesh.dofsPeriodic());
GooseFEM::Element::Quad4::Quadrature quad(
vec.AsElement(mesh.coor()),
GooseFEM::Element::Quad4::Nodal::xi(),
GooseFEM::Element::Quad4::Nodal::w());
xt::xtensor<double,2> rho = xt::ones<double>({mesh.nelem(), quad.nip()});
mat.assemble(quad.Int_N_scalar_NT_dV(rho));
xt::xtensor<double,1> M = mat.AsDiagonal();
REQUIRE(M.size() == vec.ndof());
REQUIRE(xt::allclose(M, 1.));
}
// =================================================================================================
SECTION("symGradN_vector")
{
GooseFEM::Mesh::Quad4::FineLayer mesh(27,27);
GooseFEM::Vector vec(mesh.conn(), mesh.dofs());
GooseFEM::Element::Quad4::Quadrature quad( vec.AsElement(mesh.coor()));
T2 F = xt::zeros<double>({2,2});
T2 EPS = xt::zeros<double>({2,2});
F (0,1) = 0.1;
EPS(0,1) = 0.05;
EPS(1,0) = 0.05;
xt::xtensor<double,2> coor = mesh.coor();;
xt::xtensor<double,2> disp = xt::zeros<double>(coor.shape());
for (size_t n = 0 ; n < mesh.nnode() ; ++n)
for (size_t i = 0 ; i < F.shape()[0] ; ++i)
for (size_t j = 0 ; j < F.shape()[1] ; ++j)
disp(n,i) += F(i,j) * coor(n,j);
xt::xtensor<double,4> eps = quad.SymGradN_vector(vec.AsElement(disp));
xt::xtensor<double,4> dV = quad.DV(2);
auto epsbar = xt::average(eps, dV, {0,1});
REQUIRE(eps.shape()[0] == mesh.nelem());
REQUIRE(eps.shape()[1] == quad.nip());
REQUIRE(eps.shape()[2] == mesh.ndim());
REQUIRE(eps.shape()[3] == mesh.ndim());
for (size_t e = 0 ; e < mesh.nelem() ; ++e)
for (size_t q = 0 ; q < quad.nip() ; ++q)
REQUIRE(xt::allclose(xt::view(eps, e, q), EPS));
REQUIRE(xt::allclose(epsbar, EPS));
}
// =================================================================================================
SECTION("symGradN_vector, int_gradN_dot_tensor2s_dV")
{
GooseFEM::Mesh::Quad4::FineLayer mesh(27,27);
GooseFEM::Vector vec(mesh.conn(), mesh.dofsPeriodic());
GooseFEM::Element::Quad4::Quadrature quad( vec.AsElement(mesh.coor()));
T2 F = xt::zeros<double>({2,2});
F(0,1) = 0.1;
xt::xtensor<double,2> coor = mesh.coor();;
xt::xtensor<double,2> disp = xt::zeros<double>(coor.shape());
for (size_t n = 0 ; n < mesh.nnode() ; ++n)
for (size_t i = 0 ; i < F.shape()[0] ; ++i)
for (size_t j = 0 ; j < F.shape()[1] ; ++j)
disp(n,i) += F(i,j) * coor(n,j);
xt::xtensor<double,4> eps = quad.SymGradN_vector(vec.AsElement(disp));
xt::xtensor<double,1> Fi = vec.AssembleDofs(quad.Int_gradN_dot_tensor2_dV(eps));
REQUIRE(Fi.size() == vec.ndof());
REQUIRE(xt::allclose(Fi, 0.));
}
// =================================================================================================
}

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