singularity.hpp

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// OpenBEM - Copyright (C) 2026 Shashwat Sharma
 
// This file is part of OpenBEM.
 
// OpenBEM is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3
// of the License, or (at your option) any later version.
 
// You should have received a copy of the GNU General Public License along with OpenBEM.
// If not, see <https://www.gnu.org/licenses/>.
 
 
#ifndef BEM_RWG_OPINT_SRC_SINGULARITY_H
#define BEM_RWG_OPINT_SRC_SINGULARITY_H
 
#include "types.hpp"
#include "geometry/primitives/triangle.hpp"
#include "quadrature/triangle/base.hpp"
#include "quadrature/triangle/gauss.hpp"
 
#include "kernels/base.hpp"
#include "kernels/hgf.hpp"
#include "rwg/integrators/src/base.hpp"
#include "rwg/integrators/src/quadrature.hpp"
 
 
namespace bem::rwg
{
 
template <typename TriangleQuadratureType = GaussTriangleQuadrature<2>, typename ScalarKernelType = SingularitySubtractedTaylorHGF>
class SrcSingularity: public SrcIntegratorBase
{
 
    using base = SrcIntegratorBase;
    static_assert(
        std::is_base_of<TriangleQuadratureBase<2>, TriangleQuadratureType>::value,
        "SrcSingularity: `TriangleQuadratureType` must derive from `TriangleQuadratureBase<2>`"
        );
    static_assert(
        std::is_base_of<ScalarKernelBase<3>, ScalarKernelType>::value,
        "SrcSingularity: `ScalarKernelType` must derive from `ScalarKernelBase<3>`"
        );
 
public:
 
    SrcSingularity(
        const TriangleQuadratureType tri_quad = GaussTriangleQuadrature<2>(),
        const ScalarKernelType kernel = SingularitySubtractedTaylorHGF()
        ): src_quad_(tri_quad, kernel) {};
 
 
    SrcResult integrate(
        const Complex k,
        const Triangle<2>& src_tri,
        ConstEigRef<EigMatNX<Float, 3>> r_obs
        ) override;
 
 
    const TriangleQuadratureType& quadrature_object() const
    { return src_quad_.quadrature_object(); };
 
 
    TriangleQuadratureType& quadrature_object()
    { return src_quad_.quadrature_object(); };
 
 
private:
 
    void compute_integral_terms(
        const Triangle<2>& src_tri,
        ConstEigRef<EigMatNX<Float, 3>> r_obs
        );
 
 
    SrcResult assemble_integrals(
        const Complex k,
        const Triangle<2>& src_tri,
        ConstEigRef<EigMatNX<Float, 3>> r_obs
        );
 
 
    SrcQuadrature<TriangleQuadratureType, ScalarKernelType> src_quad_;
    EigRowVec<Float> z_, z_abs_;
    EigRowVec<Float> beta_, t0_f2_;
    EigMatNX<Float, 2> u_f2_, u_f3_;
 
};
 
}
 
#include "rwg/integrators/src/singularity.tpp"
 
#endif