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FESADev/tests/unit/elements/nonlinear_mitc4_shell_tangent_test.cpp
T
KOKO\Mimi f0dc42a280 feat: implement consistent-mass HHT shell dynamics
2026-09-22 21:38:42 +09:00

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#include <gtest/gtest.h>
#include <algorithm>
#include <array>
#include <cmath>
#include <cstddef>
#include <cstdint>
#include <limits>
#include <stdexcept>
#include <string>
#include "fesa/elements/finite_rotation.h"
#include "fesa/elements/nonlinear_mitc4_inertia.h"
#include "fesa/elements/nonlinear_mitc4_shell.h"
#include "fesa/model/model_types.h"
namespace {
using Coordinates = std::array<double, 3>;
fesa::Node Node(const std::int64_t label, const Coordinates coordinates) {
return {{"Shell-Instance", label, std::to_string(label)},
coordinates,
{"nonlinear-mitc4-tangent.inp", static_cast<std::size_t>(label)}};
}
std::array<fesa::Node, 4> Nodes() {
return {Node(1, {-1.0, -1.0, 0.0}), Node(2, {1.0, -1.0, 0.0}),
Node(3, {1.0, 1.0, 0.0}), Node(4, {-1.0, 1.0, 0.0})};
}
std::array<const fesa::Node*, 4> NodePointers(
const std::array<fesa::Node, 4>& nodes) {
return {&nodes[0], &nodes[1], &nodes[2], &nodes[3]};
}
std::array<fesa::ShellNodeInitialFrame, 4> Frames() {
return {{{0U, {0.0, 0.0, 1.0}, {1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}},
{1U, {0.0, 0.0, 1.0}, {1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}},
{2U, {0.0, 0.0, 1.0}, {1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}},
{3U, {0.0, 0.0, 1.0}, {1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}}}};
}
fesa::NonlinearMitc4Shell Shell(const std::array<fesa::Node, 4>& nodes) {
const fesa::ShellSection section{
"Section", 0.2, 0U, {"nonlinear-mitc4-tangent.inp", 20U}};
const fesa::LinearElasticMaterial material{
"Material", 120.0, 0.25, {"nonlinear-mitc4-tangent.inp", 21U}};
const auto shell = fesa::NonlinearMitc4Shell::Create(
NodePointers(nodes), Frames(), section, material);
if (!shell.HasValue()) {
throw std::runtime_error{shell.GetStatus().Diagnostics()[0U].code};
}
return shell.Value();
}
fesa::NonlinearMitc4TrialDofs Trial() {
fesa::NonlinearMitc4TrialDofs trial{};
trial.displacement[0U] = {-0.02, 0.01, 0.03};
trial.displacement[1U] = {0.01, -0.03, -0.01};
trial.displacement[2U] = {0.03, 0.02, 0.04};
trial.displacement[3U] = {-0.01, 0.04, -0.02};
trial.rotation_vector[0U] = {0.03, -0.02, 0.01};
trial.rotation_vector[1U] = {-0.01, 0.04, -0.02};
trial.rotation_vector[2U] = {0.02, 0.01, 0.03};
trial.rotation_vector[3U] = {-0.03, 0.02, -0.01};
return trial;
}
fesa::NonlinearMitc4TrialDofs AddScaled(
const fesa::NonlinearMitc4TrialDofs& trial,
const fesa::NonlinearMitc4TrialDofs& direction, const double scale) {
fesa::NonlinearMitc4TrialDofs result = trial;
for (std::size_t node = 0U; node < 4U; ++node) {
result.displacement[node] =
result.displacement[node] + scale * direction.displacement[node];
result.rotation_vector[node] =
result.rotation_vector[node] + scale * direction.rotation_vector[node];
}
return result;
}
fesa::NonlinearMitc4TrialDofs Direction() {
fesa::NonlinearMitc4TrialDofs direction{};
direction.displacement[0U] = {0.5, -0.2, 0.1};
direction.displacement[1U] = {-0.1, 0.3, -0.4};
direction.displacement[2U] = {0.2, 0.1, 0.5};
direction.displacement[3U] = {-0.3, -0.4, -0.2};
direction.rotation_vector[0U] = {0.2, -0.1, 0.3};
direction.rotation_vector[1U] = {-0.3, 0.2, -0.1};
direction.rotation_vector[2U] = {0.1, 0.3, -0.2};
direction.rotation_vector[3U] = {-0.2, -0.3, 0.1};
return direction;
}
fesa::Vector ToVector(const fesa::NonlinearMitc4TrialDofs& trial) {
fesa::Vector result{24U};
for (std::size_t node = 0U; node < 4U; ++node) {
for (std::size_t component = 0U; component < 3U; ++component) {
result[6U * node + component] = trial.displacement[node][component];
result[6U * node + 3U + component] =
trial.rotation_vector[node][component];
}
}
return result;
}
double ReferenceLength(const std::array<fesa::Node, 4>& nodes) {
double length = 0.0;
for (std::size_t first = 0U; first < nodes.size(); ++first) {
for (std::size_t second = first + 1U; second < nodes.size(); ++second) {
length = (std::max)(length, (fesa::Vector3{nodes[first].coordinates} -
fesa::Vector3{nodes[second].coordinates})
.Norm());
}
}
return length;
}
fesa::NonlinearMitc4TrialDofs WorkConjugateDirection(
const std::array<fesa::Node, 4>& nodes) {
auto direction = Direction();
double maximum_component = 0.0;
for (std::size_t node = 0U; node < 4U; ++node) {
for (std::size_t component = 0U; component < 3U; ++component) {
maximum_component =
(std::max)(maximum_component,
std::abs(direction.displacement[node][component]));
maximum_component =
(std::max)(maximum_component,
std::abs(direction.rotation_vector[node][component]));
}
}
const double length = ReferenceLength(nodes);
for (std::size_t node = 0U; node < 4U; ++node) {
direction.displacement[node] =
length * direction.displacement[node] / maximum_component;
direction.rotation_vector[node] =
direction.rotation_vector[node] / maximum_component;
}
return direction;
}
fesa::Vector WorkConjugate(const fesa::Vector& vector, const double length) {
fesa::Vector result = vector;
for (std::size_t node = 0U; node < 4U; ++node) {
for (std::size_t component = 0U; component < 3U; ++component) {
result[6U * node + component] *= length;
}
}
return result;
}
double ChannelNorm(const fesa::Vector& vector, const bool translation) {
double sum = 0.0;
const std::size_t offset = translation ? 0U : 3U;
for (std::size_t node = 0U; node < 4U; ++node) {
for (std::size_t component = 0U; component < 3U; ++component) {
const double value = vector[6U * node + offset + component];
sum += value * value;
}
}
return std::sqrt(sum);
}
double FrobeniusNorm(const fesa::Matrix& matrix) {
double sum = 0.0;
for (std::size_t row = 0U; row < matrix.Rows(); ++row) {
for (std::size_t column = 0U; column < matrix.Columns(); ++column) {
sum += matrix(row, column) * matrix(row, column);
}
}
return std::sqrt(sum);
}
fesa::Matrix WorkConjugateTangent(const fesa::Matrix& tangent,
const double length) {
fesa::Matrix result = tangent;
for (std::size_t row = 0U; row < tangent.Rows(); ++row) {
const double row_scale = row % 6U < 3U ? length : 1.0;
for (std::size_t column = 0U; column < tangent.Columns(); ++column) {
const double column_scale = column % 6U < 3U ? length : 1.0;
result(row, column) *= row_scale * column_scale;
}
}
return result;
}
void ExpectRelative(const double actual, const double expected) {
if (expected == 0.0) {
EXPECT_LE(std::abs(actual), 1.0e-12);
return;
}
EXPECT_LE(std::abs(actual - expected) / std::abs(expected), 1.0e-9);
}
// NSNR-ELEM-TAN-001
TEST(NonlinearMitc4Residual, EvaluatesResidualTangentAndRecoveryAtOneTrial) {
const auto nodes = Nodes();
const auto shell = Shell(nodes);
const auto trial = Trial();
const auto recovery = shell.RecoverState(trial);
const auto result = fesa::EvaluateInternalResidualAndTangent(shell, trial);
ASSERT_TRUE(recovery.HasValue());
ASSERT_TRUE(result.HasValue());
EXPECT_EQ(result.Value().internal_residual.Size(), 24U);
EXPECT_EQ(result.Value().internal_tangent.Rows(), 24U);
EXPECT_EQ(result.Value().internal_tangent.Columns(), 24U);
EXPECT_DOUBLE_EQ(result.Value().physical_strain_energy,
result.Value().recovery.physical_strain_energy);
EXPECT_DOUBLE_EQ(result.Value().recovery.physical_strain_energy,
recovery.Value().physical_strain_energy);
for (std::size_t index = 0U; index < 24U; ++index) {
EXPECT_DOUBLE_EQ(result.Value().internal_residual[index],
result.Value().internal_force[index]);
}
for (std::size_t point = 0U;
point < result.Value().recovery.gauss_points.size(); ++point) {
EXPECT_EQ(result.Value().recovery.gauss_points[point].generalized_strain,
recovery.Value().gauss_points[point].generalized_strain);
EXPECT_EQ(result.Value().recovery.gauss_points[point].section_resultant,
recovery.Value().gauss_points[point].section_resultant);
}
}
// NSNR-ELEM-TAN-002 and NSNR-ELEM-TAN-003
TEST(NonlinearMitc4Tangent, MatchesTheApprovedDirectionalSchedule) {
const auto nodes = Nodes();
const auto shell = Shell(nodes);
const auto trial = Trial();
const auto direction = WorkConjugateDirection(nodes);
const double length = ReferenceLength(nodes);
const auto equilibrium =
fesa::EvaluateInternalResidualAndTangent(shell, trial);
ASSERT_TRUE(equilibrium.HasValue());
const fesa::Vector direction_vector = ToVector(direction);
const fesa::Vector analytical = WorkConjugate(
equilibrium.Value().internal_tangent.Multiply(direction_vector), length);
const std::array<double, 8> steps{1.0e-3, 3.0e-4, 1.0e-4, 3.0e-5,
1.0e-5, 3.0e-6, 1.0e-6, 3.0e-7};
std::array<double, 8> force_errors{};
std::array<double, 8> moment_errors{};
ASSERT_GT(ChannelNorm(analytical, true), 0.0);
ASSERT_GT(ChannelNorm(analytical, false), 0.0);
for (std::size_t index = 0U; index < steps.size(); ++index) {
const auto plus = fesa::EvaluateInternalResidualAndTangent(
shell, AddScaled(trial, direction, steps[index]));
const auto minus = fesa::EvaluateInternalResidualAndTangent(
shell, AddScaled(trial, direction, -steps[index]));
ASSERT_TRUE(plus.HasValue());
ASSERT_TRUE(minus.HasValue());
fesa::Vector derivative = plus.Value().internal_residual;
derivative.Axpy(-1.0, minus.Value().internal_residual);
derivative.Scale(0.5 / steps[index]);
derivative = WorkConjugate(derivative, length);
derivative.Axpy(-1.0, analytical);
force_errors[index] =
ChannelNorm(derivative, true) / ChannelNorm(analytical, true);
moment_errors[index] =
ChannelNorm(derivative, false) / ChannelNorm(analytical, false);
}
std::size_t force_order_count = 0U;
std::size_t moment_order_count = 0U;
for (std::size_t index = 1U; index < force_errors.size(); ++index) {
if (force_errors[index - 1U] > 0.0 && force_errors[index] > 0.0) {
const double order =
std::log(force_errors[index - 1U] / force_errors[index]) /
std::log(steps[index - 1U] / steps[index]);
if (order >= 1.5) {
++force_order_count;
}
}
if (moment_errors[index - 1U] > 0.0 && moment_errors[index] > 0.0) {
const double order =
std::log(moment_errors[index - 1U] / moment_errors[index]) /
std::log(steps[index - 1U] / steps[index]);
if (order >= 1.5) {
++moment_order_count;
}
}
}
EXPECT_GE(force_order_count, 2U);
EXPECT_GE(moment_order_count, 2U);
EXPECT_LE(force_errors[3U], 1.0e-6);
EXPECT_LE(moment_errors[3U], 1.0e-6);
}
// NSNR-ELEM-TAN-004 and NSNR-ELEM-TAN-005
TEST(NonlinearMitc4Tangent, PreservesRigidTranslationNullspaceAndSymmetry) {
const auto nodes = Nodes();
const auto equilibrium =
fesa::EvaluateInternalResidualAndTangent(Shell(nodes), {});
ASSERT_TRUE(equilibrium.HasValue());
const double length = ReferenceLength(nodes);
fesa::NonlinearMitc4TrialDofs rigid_translation{};
for (auto& displacement : rigid_translation.displacement) {
displacement = {0.3, -0.2, 0.4};
}
const fesa::Vector null_action =
WorkConjugate(equilibrium.Value().internal_tangent.Multiply(
ToVector(rigid_translation)),
length);
EXPECT_LE(null_action.Norm(), 1.0e-10);
const fesa::Matrix scaled_tangent =
WorkConjugateTangent(equilibrium.Value().internal_tangent, length);
fesa::Matrix antisymmetric = scaled_tangent;
for (std::size_t row = 0U; row < antisymmetric.Rows(); ++row) {
for (std::size_t column = 0U; column < antisymmetric.Columns(); ++column) {
antisymmetric(row, column) -= scaled_tangent(column, row);
}
}
ASSERT_GT(FrobeniusNorm(scaled_tangent), 0.0);
EXPECT_LE(FrobeniusNorm(antisymmetric) / FrobeniusNorm(scaled_tangent),
1.0e-12);
}
// NSNR-ELEM-TAN-006
TEST(NonlinearMitc4Residual, DoesNotAcceptExternalLoadShares) {
const auto nodes = Nodes();
const auto first =
fesa::EvaluateInternalResidualAndTangent(Shell(nodes), Trial());
const auto second =
fesa::EvaluateInternalResidualAndTangent(Shell(nodes), Trial());
ASSERT_TRUE(first.HasValue());
ASSERT_TRUE(second.HasValue());
for (std::size_t index = 0U; index < 24U; ++index) {
EXPECT_DOUBLE_EQ(first.Value().internal_residual[index],
second.Value().internal_residual[index]);
}
}
// NSNR-ELEM-TAN-007
TEST(NonlinearMitc4Objectivity, FiniteRigidMotionHasZeroInternalForce) {
const auto nodes = Nodes();
const fesa::Vector3 rotation{0.3, -0.2, 0.1};
const fesa::Matrix tensor = fesa::ExpSkew(rotation);
fesa::NonlinearMitc4TrialDofs trial{};
for (std::size_t node = 0U; node < nodes.size(); ++node) {
const fesa::Vector3 initial{nodes[node].coordinates};
const fesa::Vector3 rotated{
tensor(0U, 0U) * initial.X() + tensor(0U, 1U) * initial.Y() +
tensor(0U, 2U) * initial.Z(),
tensor(1U, 0U) * initial.X() + tensor(1U, 1U) * initial.Y() +
tensor(1U, 2U) * initial.Z(),
tensor(2U, 0U) * initial.X() + tensor(2U, 1U) * initial.Y() +
tensor(2U, 2U) * initial.Z()};
trial.displacement[node] =
rotated + fesa::Vector3{0.7, -0.4, 1.2} - initial;
trial.rotation_vector[node] = rotation;
}
const auto result =
fesa::EvaluateInternalResidualAndTangent(Shell(nodes), trial);
ASSERT_TRUE(result.HasValue());
EXPECT_LE(result.Value().internal_residual.Norm(), 1.0e-10);
EXPECT_LE(result.Value().physical_strain_energy, 1.0e-12);
}
// NSNR-ELEM-TAN-008
TEST(NonlinearMitc4Patch, RetainsPhysicalRecoveryIdentities) {
const auto nodes = Nodes();
const auto shell = Shell(nodes);
constexpr double kMembraneStrain = 1.0e-2;
const double green_strain =
kMembraneStrain + 0.5 * kMembraneStrain * kMembraneStrain;
constexpr double kYoungsModulus = 120.0;
constexpr double kPoissonRatio = 0.25;
constexpr double kThickness = 0.2;
const double plane_stress =
kYoungsModulus / (1.0 - kPoissonRatio * kPoissonRatio);
const double s11 = plane_stress * green_strain;
const double s22 = plane_stress * kPoissonRatio * green_strain;
fesa::NonlinearMitc4TrialDofs trial{};
for (std::size_t node = 0U; node < nodes.size(); ++node) {
trial.displacement[node] = {kMembraneStrain * nodes[node].coordinates[0U],
0.0, 0.0};
}
const auto result = fesa::EvaluateInternalResidualAndTangent(shell, trial);
ASSERT_TRUE(result.HasValue());
for (const auto& point : result.Value().recovery.gauss_points) {
ExpectRelative(point.generalized_strain[0U], green_strain);
for (std::size_t component = 1U; component < 8U; ++component) {
ExpectRelative(point.generalized_strain[component], 0.0);
}
ExpectRelative(point.section_resultant[0U], kThickness * s11);
ExpectRelative(point.section_resultant[1U], kThickness * s22);
for (std::size_t component = 2U; component < 8U; ++component) {
ExpectRelative(point.section_resultant[component], 0.0);
}
for (const auto& stress : point.stress) {
ExpectRelative(stress.components[0U], s11);
ExpectRelative(stress.components[1U], s22);
ExpectRelative(stress.components[2U], 0.0);
}
}
}
// NSNR-ELEM-TAN-009
TEST(NonlinearMitc4Residual, RejectsNonfiniteTrialData) {
const auto nodes = Nodes();
auto trial = Trial();
trial.rotation_vector[2U] = {std::numeric_limits<double>::quiet_NaN(), 0.0,
0.0};
const auto result =
fesa::EvaluateInternalResidualAndTangent(Shell(nodes), trial);
ASSERT_FALSE(result.HasValue());
EXPECT_EQ(result.GetStatus().Diagnostics()[0U].code,
"invalid-nonlinear-shell-trial");
auto overflow = Trial();
overflow.displacement[1U] = {1.0e300, 0.0, 0.0};
const auto overflow_result =
fesa::EvaluateInternalResidualAndTangent(Shell(nodes), overflow);
EXPECT_FALSE(overflow_result.HasValue());
}
void CheckThirdSweep(const fesa::NonlinearMitc4TrialDofs& trial) {
const auto nodes = Nodes();
const auto shell = Shell(nodes);
auto direction = Direction();
double norm = 0.0;
const auto unscaled = ToVector(direction);
for (std::size_t i = 0U; i < 24U; ++i) {
norm = std::hypot(norm, unscaled[i]);
}
for (std::size_t node = 0U; node < 4U; ++node) {
direction.displacement[node] = 2.0 * direction.displacement[node] / norm;
direction.rotation_vector[node] = direction.rotation_vector[node] / norm;
}
const auto velocity = ToVector(direction);
const auto exact =
fesa::EvaluateInternalResidualAndTangent(shell, trial, &velocity);
ASSERT_TRUE(exact.HasValue());
unsigned int consecutive = 0U;
bool passed = false;
for (int power = 8; power <= 20; power += 2) {
const double h = std::ldexp(1.0, -power);
const auto plus = fesa::EvaluateInternalResidualAndTangent(
shell, AddScaled(trial, direction, h));
const auto minus = fesa::EvaluateInternalResidualAndTangent(
shell, AddScaled(trial, direction, -h));
ASSERT_TRUE(plus.HasValue());
ASSERT_TRUE(minus.HasValue());
double error = 0.0;
double analytic_norm = 0.0;
double fd_norm = 0.0;
for (std::size_t i = 0U; i < 24U; ++i) {
double fd = 0.0;
for (std::size_t j = 0U; j < 24U; ++j) {
fd += (plus.Value().internal_tangent(i, j) -
minus.Value().internal_tangent(i, j)) *
velocity[j] / (2.0 * h);
}
const double d = i % 6U < 3U ? 2.0 : 1.0;
const double analytic = exact.Value().force_directional_second[i];
error = std::hypot(error, d * (analytic - fd));
analytic_norm = std::hypot(analytic_norm, d * analytic);
fd_norm = std::hypot(fd_norm, d * fd);
}
if (power >= 10 && power <= 18 &&
error / (analytic_norm + fd_norm) <= 1e-6) {
++consecutive;
passed = passed || consecutive >= 2U;
} else {
consecutive = 0U;
}
}
EXPECT_TRUE(passed);
EXPECT_GE(exact.Value().drilling_energy, 0.0);
for (std::size_t i = 0U; i < 24U; ++i) {
EXPECT_DOUBLE_EQ(
exact.Value().internal_force[i],
exact.Value().physical_force[i] + exact.Value().drilling_force[i]);
}
}
TEST(NonlinearMitc4Residual,
ZeroTrialOnTranslatedDecimalMeshHasNoArtificialForce) {
auto nodes = Nodes();
nodes[0].coordinates = {3.84615385, 2.30769231, 0.0};
nodes[1].coordinates = {4.23076923, 2.30769231, 0.0};
nodes[2].coordinates = {4.23076923, 2.69230769, 0.0};
nodes[3].coordinates = {3.84615385, 2.69230769, 0.0};
const auto shell = Shell(nodes);
const auto evaluated = fesa::EvaluateInternalResidualAndTangent(shell, {});
ASSERT_TRUE(evaluated.HasValue());
for (std::size_t i = 0; i < 24U; ++i)
EXPECT_DOUBLE_EQ(evaluated.Value().internal_force[i], 0.0);
EXPECT_DOUBLE_EQ(evaluated.Value().drilling_energy, 0.0);
}
TEST(NonlinearMitc4Residual, ExactDirectionalThirdGradientMatchesTangentSweep) {
CheckThirdSweep(Trial());
}
TEST(NonlinearMitc4Residual, ThirdGradientIsStableAcrossSmallAngleBranches) {
for (const double angle : {1e-4 * (1 - std::ldexp(1., -10)),
1e-4 * (1 + std::ldexp(1., -10)), 2e-4, 1e-3}) {
SCOPED_TRACE(angle);
auto trial = Trial();
for (auto& phi : trial.rotation_vector) phi = {angle, 0., 0.};
CheckThirdSweep(trial);
}
}
TEST(NonlinearMitc4Residual,
ExactDrillingConstraintHasIndependentForceGradientAndHessian) {
for (bool warped : {false, true}) {
auto nodes = Nodes();
if (warped) nodes[2U].coordinates[2U] = 0.1;
const auto shell = Shell(nodes);
auto trial = Trial();
trial.rotation_vector[0U] = {.6, -.2, .1};
const auto direction = Direction();
const auto velocity = ToVector(direction);
const auto exact =
fesa::EvaluateInternalResidualAndTangent(shell, trial, &velocity);
ASSERT_TRUE(exact.HasValue());
for (std::size_t node = 0U; node < 4U; ++node) {
const auto rotation = fesa::EvaluateDynamicRotation(
trial.rotation_vector[node], {0., 0., 1.},
direction.rotation_vector[node], {});
ASSERT_TRUE(rotation.HasValue());
double psi = 0.;
for (std::size_t c = 0U; c < 3U; ++c)
psi += rotation.Value().drill_null[c] *
exact.Value().internal_force[6U * node + 3U + c];
EXPECT_NEAR(exact.Value().drilling_constraint[node], psi, 1e-11);
for (std::size_t i = 0U; i < 24U; ++i) {
double gradient = 0.;
for (std::size_t c = 0U; c < 3U; ++c) {
gradient += rotation.Value().drill_null[c] *
exact.Value().internal_tangent(6U * node + 3U + c, i);
if (i / 6U == node && i % 6U >= 3U)
gradient += rotation.Value().null_gradient(c, i % 6U - 3U) *
exact.Value().internal_force[6U * node + 3U + c];
}
EXPECT_NEAR(exact.Value().drilling_constraint_gradient(node, i),
gradient, 1e-10);
}
}
unsigned consecutive = 0U;
bool passed = false;
for (int power = 8; power <= 20; power += 2) {
const double h = std::ldexp(1., -power);
const auto plus = fesa::EvaluateInternalResidualAndTangent(
shell, AddScaled(trial, direction, h), &velocity);
const auto minus = fesa::EvaluateInternalResidualAndTangent(
shell, AddScaled(trial, direction, -h), &velocity);
ASSERT_TRUE(plus.HasValue());
ASSERT_TRUE(minus.HasValue());
double error = 0., anorm = 0., fnorm = 0.;
for (std::size_t node = 0U; node < 4U; ++node)
for (std::size_t i = 0U; i < 24U; ++i) {
double analytic = 0.;
for (std::size_t j = 0U; j < 24U; ++j)
analytic += exact.Value().drilling_constraint_hessian[node](i, j) *
velocity[j];
const double fd =
(plus.Value().drilling_constraint_gradient(node, i) -
minus.Value().drilling_constraint_gradient(node, i)) /
(2 * h);
const double scale = i % 6U < 3U ? 2. : 1.;
error = std::hypot(error, scale * (analytic - fd));
anorm = std::hypot(anorm, scale * analytic);
fnorm = std::hypot(fnorm, scale * fd);
}
if (power >= 10 && power <= 18 && error / (anorm + fnorm) <= 1e-6) {
++consecutive;
passed = passed || consecutive >= 2U;
} else
consecutive = 0U;
}
EXPECT_TRUE(passed);
}
}
} // namespace
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