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mfem/tests/unit/fem/test_quadinterpolator.cpp
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// Copyright (c) 2010-2022, Lawrence Livermore National Security, LLC. Produced
// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
// LICENSE and NOTICE for details. LLNL-CODE-806117.
//
// This file is part of the MFEM library. For more information and source code
// availability visit https://mfem.org.
//
// MFEM is free software; you can redistribute it and/or modify it under the
// terms of the BSD-3 license. We welcome feedback and contributions, see file
// CONTRIBUTING.md for details.
#include "mfem.hpp"
#include "unit_tests.hpp"
using namespace mfem;
static bool testQuadratureInterpolator(const int dim,
const int p,
const int qpts,
const QVectorLayout q_layout,
const int nx, const int ny, const int nz)
{
// Keep for debugging purposes:
if (verbose_tests)
{
std::cout << "testQuadratureInterpolator(dim=" << dim
<< ",p=" << p
<< ",q=" << qpts
<< ",l=" << (q_layout == QVectorLayout::byNODES ?
"by_nodes" : "by_vdim")
<< ",nx=" << nx
<< ",ny=" << ny
<< ",nz=" << nz
<< ")" << std::endl;
}
const int vdim = dim;
const int seed = 0x100001b3;
const int ordering = Ordering::byNODES;
REQUIRE((dim == 2 || dim == 3));
Mesh mesh = dim == 1 ? Mesh::MakeCartesian1D(nx, Element::SEGMENT) :
dim == 2 ? Mesh::MakeCartesian2D(nx,ny, Element::QUADRILATERAL):
Mesh::MakeCartesian3D(nx,nx,nz, Element::HEXAHEDRON);
const H1_FECollection fec(p, dim);
FiniteElementSpace sfes(&mesh, &fec, 1, ordering);
FiniteElementSpace vfes(&mesh, &fec, vdim, ordering);
GridFunction x(&sfes);
x.Randomize(seed);
GridFunction nodes(&vfes);
mesh.SetNodalGridFunction(&nodes);
{
Array<int> dofs, vdofs;
GridFunction rdm(&vfes);
Vector h0(vfes.GetNDofs());
rdm.Randomize(seed);
rdm -= 0.5;
h0 = infinity();
for (int i = 0; i < mesh.GetNE(); i++)
{
vfes.GetElementDofs(i, dofs);
const double hi = mesh.GetElementSize(i);
for (int j = 0; j < dofs.Size(); j++)
{
h0(dofs[j]) = std::min(h0(dofs[j]), hi);
}
}
rdm.HostReadWrite();
for (int i = 0; i < vfes.GetNDofs(); i++)
{
for (int d = 0; d < dim; d++)
{
rdm(vfes.DofToVDof(i,d)) *= (0.25/p)*h0(i);
}
}
for (int i = 0; i < vfes.GetNBE(); i++)
{
vfes.GetBdrElementVDofs(i, vdofs);
for (int j = 0; j < vdofs.Size(); j++) { rdm(vdofs[j]) = 0.0; }
}
nodes -= rdm;
}
const Geometry::Type GeomType = mesh.GetElementBaseGeometry(0);
const IntegrationRule &ir = IntRules.Get(GeomType, 2*qpts-1);
const QuadratureInterpolator *sqi(sfes.GetQuadratureInterpolator(ir));
const QuadratureInterpolator *vqi(vfes.GetQuadratureInterpolator(ir));
const int NE(mesh.GetNE());
const int NQ(ir.GetNPoints());
const int ND(sfes.GetFE(0)->GetDof());
REQUIRE(ND == vfes.GetFE(0)->GetDof());
const ElementDofOrdering nat_ordering = ElementDofOrdering::NATIVE;
const ElementDofOrdering lex_ordering = ElementDofOrdering::LEXICOGRAPHIC;
const Operator *SRN(sfes.GetElementRestriction(nat_ordering));
const Operator *SRL(sfes.GetElementRestriction(lex_ordering));
const Operator *VRN(vfes.GetElementRestriction(nat_ordering));
const Operator *VRL(vfes.GetElementRestriction(lex_ordering));
MFEM_VERIFY(SRN, "No element sn-restriction operator found!");
MFEM_VERIFY(SRL, "No element sl-restriction operator found!");
MFEM_VERIFY(VRN, "No element vn-restriction operator found!");
MFEM_VERIFY(VRL, "No element vl-restriction operator found!");
const double rel_tol = 1e-12;
{
// Scalar
sqi->SetOutputLayout(q_layout);
Vector xe(1*ND*NE);
REQUIRE(xe.Size() == SRN->Height());
REQUIRE(SRN->Height() == SRL->Height());
// Full results
Vector sq_val_f(NQ*NE), sq_der_f(dim*NQ*NE), sq_pdr_f(dim*NQ*NE);
// Tensor results
Vector sq_val_t(NQ*NE), sq_der_t(dim*NQ*NE), sq_pdr_t(dim*NQ*NE);
{
// Full
SRN->Mult(x, xe);
sqi->DisableTensorProducts();
sqi->Values(xe, sq_val_f);
sqi->Derivatives(xe, sq_der_f);
sqi->PhysDerivatives(xe, sq_pdr_f);
}
{
// Tensor
SRL->Mult(x, xe);
sqi->EnableTensorProducts();
sqi->Values(xe, sq_val_t);
sqi->Derivatives(xe, sq_der_t);
sqi->PhysDerivatives(xe, sq_pdr_t);
}
double norm, rel_error;
norm = sq_val_f.Normlinf();
sq_val_f -= sq_val_t;
rel_error = sq_val_f.Normlinf()/norm;
if (verbose_tests)
{ std::cout << "sq_val rel. error = " << rel_error << std::endl; }
REQUIRE(rel_error <= rel_tol);
norm = sq_der_f.Normlinf();
sq_der_f -= sq_der_t;
rel_error = sq_der_f.Normlinf()/norm;
if (verbose_tests)
{ std::cout << "sq_der rel. error = " << rel_error << std::endl; }
REQUIRE(rel_error <= rel_tol);
norm = sq_pdr_f.Normlinf();
sq_pdr_f -= sq_pdr_t;
rel_error = sq_pdr_f.Normlinf()/norm;
if (verbose_tests)
{ std::cout << "sq_pdr rel. error = " << rel_error << std::endl; }
REQUIRE(rel_error <= rel_tol);
}
{
// Vector
vqi->SetOutputLayout(q_layout);
Vector ne(vdim*ND*NE);
REQUIRE(ne.Size() == VRN->Height());
REQUIRE(VRN->Height() == VRL->Height());
// Full results
Vector vq_val_f(dim*NQ*NE), vq_der_f(vdim*dim*NQ*NE),
vq_det_f(NQ*NE),
vq_pdr_f(vdim*dim*NQ*NE);
// Tensor results
Vector vq_val_t(dim*NQ*NE), vq_der_t(vdim*dim*NQ*NE),
vq_det_t(NQ*NE),
vq_pdr_t(vdim*dim*NQ*NE);
{
// Full
VRN->Mult(nodes, ne);
vqi->DisableTensorProducts();
vqi->Values(ne, vq_val_f);
vqi->Derivatives(ne, vq_der_f);
vqi->Determinants(ne, vq_det_f);
vqi->PhysDerivatives(ne, vq_pdr_f);
}
{
// Tensor
VRL->Mult(nodes, ne);
vqi->EnableTensorProducts();
vqi->Values(ne, vq_val_t);
vqi->Derivatives(ne, vq_der_t);
vqi->Determinants(ne, vq_det_t);
vqi->PhysDerivatives(ne, vq_pdr_t);
}
double norm, rel_error;
norm = vq_val_f.Normlinf();
vq_val_f -= vq_val_t;
rel_error = vq_val_f.Normlinf()/norm;
if (verbose_tests)
{ std::cout << "vq_val rel. error = " << rel_error << std::endl; }
REQUIRE(rel_error <= rel_tol);
norm = vq_der_f.Normlinf();
vq_der_f -= vq_der_t;
rel_error = vq_der_f.Normlinf()/norm;
if (verbose_tests)
{ std::cout << "vq_der rel. error = " << rel_error << std::endl; }
REQUIRE(rel_error <= rel_tol);
norm = vq_det_f.Normlinf();
vq_det_f -= vq_det_t;
rel_error = vq_det_f.Normlinf()/norm;
if (verbose_tests)
{ std::cout << "vq_det rel. error = " << rel_error << std::endl; }
REQUIRE(rel_error <= rel_tol);
norm = vq_pdr_f.Normlinf();
vq_pdr_f -= vq_pdr_t;
rel_error = vq_pdr_f.Normlinf()/norm;
if (verbose_tests)
{ std::cout << "vq_pdr rel. error = " << rel_error << std::endl; }
REQUIRE(rel_error <= rel_tol);
}
return true;
}
TEST_CASE("QuadratureInterpolator",
"[QuadratureInterpolator]"
"[CUDA]")
{
const auto d = GENERATE(2,3); // dimension
const auto p = GENERATE(range(1,7)); // element order, 1 <= p < 7
const auto q = GENERATE_COPY(p+1,p+2); // 1D quadrature points
const auto l = GENERATE(QVectorLayout::byNODES, QVectorLayout::byVDIM);
const auto nx = 3; // number of element in x
const auto ny = 3; // number of element in y
const auto nz = 3; // number of element in z
testQuadratureInterpolator(d, p, q, l, nx, ny, nz);
} // TEST_CASE "QuadratureInterpolator"