double_layer.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_OPS_DOUBLE_LAYER_H
#define BEM_RWG_OPS_DOUBLE_LAYER_H
 
#include <type_traits>
 
#include "types.hpp"
#include "constants.hpp"
#include "geometry/primitives/triangle.hpp"
 
#include "rwg/operators/base.hpp"
 
#include "rwg/integrators/obs/base.hpp"
#include "rwg/integrators/obs/strategic.hpp"
 
 
namespace bem::rwg
{
 
template <typename ObsIntegratorType = ObsStrategic<>>
class VectorDoubleLayerPvOp: public OperatorBase<3, 3>
{
 
    static_assert(
        std::is_base_of<ObsIntegratorBase, ObsIntegratorType>::value,
        "VectorDoubleLayerPvOp: `ObsIntegratorType` must derive from `ObsIntegratorBase`"
        );
 
public:
 
    VectorDoubleLayerPvOp(const ObsIntegratorType obs_integrator = ObsStrategic<>()):
        obs_integrator_(obs_integrator) {};
 
 
    EigMatMN<Complex, 3, 3> compute(
        const Complex k,
        const Triangle<3>& obs_tri,
        const Triangle<3>& src_tri
        ) override;
 
 
    EigMatMN<Complex, 3, 3> assemble(
        const Complex k,
        const Triangle<3>& obs_tri,
        const Triangle<3>& src_tri,
        const ObsResult& obs_result
        );
 
 
protected:
 
    ObsIntegratorType obs_integrator_;
 
};
 
 
template <typename ObsIntegratorType = ObsStrategic<>>
class RotVectorDoubleLayerPvOp: public OperatorBase<3, 3>
{
 
    static_assert(
        std::is_base_of<ObsIntegratorBase, ObsIntegratorType>::value,
        "RotVectorDoubleLayerPvOp: `ObsIntegratorType` must derive from `ObsIntegratorBase`"
        );
 
public:
 
    RotVectorDoubleLayerPvOp(const ObsIntegratorType obs_integrator = ObsStrategic<>()):
        obs_integrator_(obs_integrator) {};
 
 
    EigMatMN<Complex, 3, 3> compute(
        const Complex k,
        const Triangle<3>& obs_tri,
        const Triangle<3>& src_tri
        ) override;
 
 
    EigMatMN<Complex, 3, 3> assemble(
        const Complex k,
        const Triangle<3>& obs_tri,
        const Triangle<3>& src_tri,
        const ObsResult& obs_result
        );
 
 
protected:
 
    ObsIntegratorType obs_integrator_;
 
};
 
}
 
#include "rwg/operators/double_layer.tpp"
 
#endif