GCC Code Coverage Report

Directory: Bembel/src/
File: HomogenisedLaplace/SingleLayerOperator.hpp
Date: 2024-12-18 07:36:36
Exec Total Coverage
Lines: 46 46 100.0%
Functions: 6 6 100.0%
Branches: 44 88 50.0%
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1 // This file is part of Bembel, the higher order C++ boundary element library.
2 //
3 // Copyright (C) 2022 see <http://www.bembel.eu>
4 //
5 // It was written as part of a cooperation of J. Doelz, H. Harbrecht, S. Kurz,
6 // M. Multerer, S. Schoeps, and F. Wolf at Technische Universitaet Darmstadt,
7 // Universitaet Basel, and Universita della Svizzera italiana, Lugano. This
8 // source code is subject to the GNU General Public License version 3 and
9 // provided WITHOUT ANY WARRANTY, see <http://www.bembel.eu> for further
10 // information.
11
12 #ifndef BEMBEL_SRC_HOMOGENISEDLAPLACE_SINGLELAYEROPERATOR_HPP_
13 #define BEMBEL_SRC_HOMOGENISEDLAPLACE_SINGLELAYEROPERATOR_HPP_
14
15 namespace Bembel {
16 // forward declaration of class HomogenisedLaplaceSingleLayerOperator
17 // in order to define traits
18 class HomogenisedLaplaceSingleLayerOperator;
19
20 /**
21 * \brief Specification of the LinerOperatorTraits for the Homogenised Laplace.
22 */
23 template<>
24 struct LinearOperatorTraits<HomogenisedLaplaceSingleLayerOperator> {
25 typedef Eigen::VectorXd EigenType;
26 typedef Eigen::VectorXd::Scalar Scalar;
27 enum {
28 OperatorOrder = -1,
29 Form = DifferentialForm::Discontinuous,
30 NumberOfFMMComponents = 1
31 };
32 };
33
34 /**
35 * \ingroup HomogenisedLaplace
36 * \brief This class implements the specification of the integration for the
37 * single layer operator for the homogenised Laplace.
38 */
39 class HomogenisedLaplaceSingleLayerOperator : public LinearOperatorBase<
40 HomogenisedLaplaceSingleLayerOperator> {
41 // implementation of the kernel evaluation, which may be based on the
42 // information available from the superSpace
43 public:
44 /**
45 * \brief Constructs an object initialising the coefficients and the degree
46 * via the static variable precision.
47 */
48 2 HomogenisedLaplaceSingleLayerOperator() {
49 2 this->deg = getDegree(HomogenisedLaplaceSingleLayerOperator::precision);
50
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 4 this->cs = getCoefficients(
51 2 HomogenisedLaplaceSingleLayerOperator::precision);
52 2 }
53
54 template<class T>
55 787320 void evaluateIntegrand_impl(const T &super_space, const SurfacePoint &p1,
56 const SurfacePoint &p2,
57 Eigen::Matrix<
58 typename LinearOperatorTraits<HomogenisedLaplaceSingleLayerOperator
59 >::Scalar, Eigen::Dynamic, Eigen::Dynamic> *intval) const {
60 787320 auto polynomial_degree = super_space.get_polynomial_degree();
61 787320 auto polynomial_degree_plus_one_squared = (polynomial_degree + 1)
62 787320 * (polynomial_degree + 1);
63
64 // get evaluation points on unit square
65
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 787320 auto s = p1.segment < 2 > (0);
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 787320 auto t = p2.segment < 2 > (0);
67
68 // get quadrature weights
69
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 787320 auto ws = p1(2);
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 787320 auto wt = p2(2);
71
72 // get points on geometry and tangential derivatives
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 787320 auto x_f = p1.segment < 3 > (3);
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 787320 auto x_f_dx = p1.segment < 3 > (6);
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 787320 auto x_f_dy = p1.segment < 3 > (9);
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 787320 auto y_f = p2.segment < 3 > (3);
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 787320 auto y_f_dx = p2.segment < 3 > (6);
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 787320 auto y_f_dy = p2.segment < 3 > (9);
79
80 // compute surface measures from tangential derivatives
81
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 787320 auto x_kappa = x_f_dx.cross(x_f_dy).norm();
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 787320 auto y_kappa = y_f_dx.cross(y_f_dy).norm();
83
84 // integrand without basis functions
85
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 787320 auto integrand = evaluateKernel(x_f, y_f) * x_kappa * y_kappa * ws * wt;
86
87 // multiply basis functions with integrand and add to intval, this is an
88 // efficient implementation of
89 // (*intval) += super_space.basisInteraction(s, t)
90 // * evaluateKernel(x_f, y_f) * x_kappa * y_kappa * ws * wt;
91
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 787320 super_space.addScaledBasisInteraction(intval, integrand, s, t);
92
93 1574640 return;
94 }
95
96 1889568 Eigen::Matrix<double, 1, 1> evaluateFMMInterpolation_impl(
97 const SurfacePoint &p1, const SurfacePoint &p2) const {
98 // get evaluation points on unit square
99
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 1889568 auto s = p1.segment < 2 > (0);
100
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 1889568 auto t = p2.segment < 2 > (0);
101
102 // get points on geometry and tangential derivatives
103
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 1889568 auto x_f = p1.segment < 3 > (3);
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 1889568 auto x_f_dx = p1.segment < 3 > (6);
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 1889568 auto x_f_dy = p1.segment < 3 > (9);
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 1889568 auto y_f = p2.segment < 3 > (3);
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 1889568 auto y_f_dx = p2.segment < 3 > (6);
108
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 1889568 auto y_f_dy = p2.segment < 3 > (9);
109
110 // compute surface measures from tangential derivatives
111
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 1889568 auto x_kappa = x_f_dx.cross(x_f_dy).norm();
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 1889568 auto y_kappa = y_f_dx.cross(y_f_dy).norm();
113
114 // interpolation
115
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 1889568 Eigen::Matrix<double, 1, 1> intval;
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 1889568 intval(0) = evaluateKernel(x_f, y_f) * x_kappa * y_kappa;
117
118 3779136 return intval;
119 }
120
121 /**
122 * \brief Fundamental solution of the Homogenised Laplace problem
123 */
124 2676888 double evaluateKernel(const Eigen::Vector3d &x,
125 const Eigen::Vector3d &y) const {
126
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 2676888 return k_mod(x - y)
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 2676888 + evaluate_solid_sphericals(x - y, this->cs, this->deg, false);
128 }
129
130 /**
131 * \brief sets the precision of the periodicity of the kernel
132 */
133 2 static void setPrecision(double p) {
134 2 HomogenisedLaplaceSingleLayerOperator::precision = p;
135 2 }
136
137 /**
138 * \brief returns the precision of the periodicity of the kernel
139 */
140 4 static double getPrecision() {
141 4 return HomogenisedLaplaceSingleLayerOperator::precision;
142 }
143
144 private:
145 /** The degree of the spherical harmonics expansion */
146 unsigned int deg;
147 /** The coefficients of the spherical harmonics expansion */
148 Eigen::VectorXd cs;
149 /** The precision of the periodicity of the kernel */
150 static double precision;
151 };
152
153 double HomogenisedLaplaceSingleLayerOperator::precision = 0;
154
155 } // namespace Bembel
156
157 #endif // BEMBEL_SRC_HOMOGENISEDLAPLACE_SINGLELAYEROPERATOR_HPP_
158