hgf.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_KERNEL_HGF_H
#define BEM_KERNEL_HGF_H
 
#include "types.hpp"
#include "kernels/base.hpp"
 
 
namespace bem
{
 
class HGF: public ScalarKernelBase<3>
{
 
public:
 
    Complex kernel(
        ConstEigRef<EigColVecN<Float, 3>> r_obs,
        ConstEigRef<EigColVecN<Float, 3>> r_src,
        const Complex k
        ) const;
 
 
    EigColVecN<Complex, 3> grad_kernel(
        ConstEigRef<EigColVecN<Float, 3>> r_obs,
        ConstEigRef<EigColVecN<Float, 3>> r_src,
        const Complex k
        ) const;
 
};
 
 
class SingularitySubtractedHGF: public ScalarKernelBase<3>
{
public:
 
    Complex kernel(
        ConstEigRef<EigColVecN<Float, 3>> r_obs,
        ConstEigRef<EigColVecN<Float, 3>> r_src,
        const Complex k
        ) const;
 
 
    EigColVecN<Complex, 3> grad_kernel(
        ConstEigRef<EigColVecN<Float, 3>> r_obs,
        ConstEigRef<EigColVecN<Float, 3>> r_src,
        const Complex k
        ) const;
 
};
 
 
class SingularitySubtractedTaylorHGF: public ScalarKernelBase<3>
{
public:
 
    Complex kernel(
        ConstEigRef<EigColVecN<Float, 3>> r_obs,
        ConstEigRef<EigColVecN<Float, 3>> r_src,
        const Complex k
        ) const;
 
 
    EigColVecN<Complex, 3> grad_kernel(
        ConstEigRef<EigColVecN<Float, 3>> r_obs,
        ConstEigRef<EigColVecN<Float, 3>> r_src,
        const Complex k
        ) const;
 
};
 
}
 
#ifndef BEM_LINKED
#include "kernels/hgf.cpp"
#endif
 
#endif