particle_generator_lattice.h

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/* -------------------------------------------------------------------------*
 *                              SPHinXsys                                   *
 * --------------------------------------------------------------------------*
 * SPHinXsys (pronunciation: s'finksis) is an acronym from Smoothed Particle    *
 * Hydrodynamics for industrial compleX systems. It provides C++ APIs for   *
 * physical accurate simulation and aims to model coupled industrial dynamic *
 * systems including fluid, solid, multi-body dynamics and beyond with SPH  *
 * (smoothed particle hydrodynamics), a meshless computational method using *
 * particle discretization.                                                 *
 *                                                                          *
 * SPHinXsys is partially funded by German Research Foundation              *
 * (Deutsche Forschungsgemeinschaft) DFG HU1527/6-1, HU1527/10-1                *
 * and HU1527/12-1.                                                         *
 *                                                                           *
 * Portions copyright (c) 2017-2020 Technical University of Munich and      *
 * the authors' affiliations.                                               *
 *                                                                           *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may   *
 * not use this file except in compliance with the License. You may obtain a *
 * copy of the License at http://www.apache.org/licenses/LICENSE-2.0.        *
 *                                                                           *
 * --------------------------------------------------------------------------*/
#ifndef PARTICLE_GENERATOR_LATTICE_H
#define PARTICLE_GENERATOR_LATTICE_H

#include "base_particle_generator.h"

namespace SPH
{

    class Shape;
    class ParticleSpacingByBodyShape;
    class ShellParticles;

    class BaseParticleGeneratorLattice
    {
    public:
        explicit BaseParticleGeneratorLattice(SPHBody &sph_body);
        virtual ~BaseParticleGeneratorLattice(){};

    protected:
        Real lattice_spacing_;
        BoundingBox domain_bounds_;
        Shape &body_shape_;
    };

    class ParticleGeneratorLattice : public BaseParticleGeneratorLattice, public ParticleGenerator
    {
    public:
        explicit ParticleGeneratorLattice(SPHBody &sph_body);
        virtual ~ParticleGeneratorLattice(){};

        virtual void initializeGeometricVariables() override;
    };

    class ParticleGeneratorMultiResolution : public ParticleGeneratorLattice
    {
    public:
        explicit ParticleGeneratorMultiResolution(SPHBody &sph_body);
        virtual ~ParticleGeneratorMultiResolution(){};

    protected:
        ParticleSpacingByBodyShape *particle_adaptation_;
        StdLargeVec<Real> &h_ratio_;

        virtual void initializePositionAndVolumetricMeasure(const Vecd &position, Real volume) override;
        virtual void initializeSmoothingLengthRatio(Real local_spacing);
    };

    class ThickSurfaceParticleGeneratorLattice : public BaseParticleGeneratorLattice, public SurfaceParticleGenerator
    {
    public:
        ThickSurfaceParticleGeneratorLattice(SPHBody &sph_body, Real global_avg_thickness);
        virtual ~ThickSurfaceParticleGeneratorLattice(){};

        virtual void initializeGeometricVariables() override;

    protected:
        Real total_volume_; 
        Real global_avg_thickness_;
        Real particle_spacing_;
        Real avg_particle_volume_;
        size_t number_of_cells_;
        size_t planned_number_of_particles_;
    };
}
#endif // PARTICLE_GENERATOR_LATTICE_H