refined_gridX.h

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#pragma once
 
#include "interpolation.h"
#include "evaluationX.h"
#include "weightsX.h"
#include "gridX.h"
#include "base_geometryX.h"
#include "refined_grid.h"
 
 
namespace dg
{
 
template<class real_type>
struct aRealRefinementX2d
{
    void generate( const RealGridX2d<real_type>& g_old, thrust::host_vector<real_type>& weightsX, thrust::host_vector<real_type>& weightsY, thrust::host_vector<real_type>& abscissasX, thrust::host_vector<real_type>& abscissasY) const
    {
        thrust::host_vector<real_type> wx, ax, wy, ay;
        RealGrid1d<real_type> gx( g_old.x0(), g_old.x1(), g_old.n(), g_old.Nx(), g_old.bcx());
        do_generateX(gx,g_old.inner_Nx(), wx,ax);
        RealGridX1d<real_type> gy( g_old.y0(), g_old.y1(), g_old.fy(), g_old.n(), g_old.Ny(), g_old.bcy());
        do_generateY(gy,wy,ay);
        unsigned size=wx.size()*wy.size();
        weightsX.resize(size), weightsY.resize(size);
        abscissasX.resize(size), abscissasY.resize(size);
        //now make product space
        for( unsigned i=0; i<wy.size(); i++)
            for( unsigned j=0; j<wx.size(); j++)
            {
                weightsX[i*wx.size()+j] = wx[j];
                weightsY[i*wx.size()+j] = wy[i];
                abscissasX[i*wx.size()+j] = ax[j];
                abscissasY[i*wx.size()+j] = ay[i];
            }
    }
 
    unsigned nx_new( unsigned Nx_old, real_type fx_old) const
    {
        return do_Nx_new(Nx_old, fx_old);
    }
    unsigned ny_new( unsigned Ny_old, real_type fy_old) const
    {
        return do_Ny_new(Ny_old, fy_old);
    }
    real_type fx_new( unsigned Nx_old, real_type fx_old) const
    {
        return do_fx_new(Nx_old, fx_old);
    }
    real_type fy_new( unsigned Ny_old, real_type fy_old) const
    {
        return do_fy_new(Ny_old, fy_old);
    }
    virtual aRealRefinementX2d* clone()const=0;
    virtual ~aRealRefinementX2d() = default;
    protected:
    aRealRefinementX2d() = default;
    aRealRefinementX2d(const aRealRefinementX2d& src) = default;
    aRealRefinementX2d& operator=(const aRealRefinementX2d& src) = default;
    private:
    virtual void do_generateX( const RealGrid1d<real_type>& gx, unsigned nodeXX, thrust::host_vector<real_type>& weights, thrust::host_vector<real_type>& abscissas) const =0;
    virtual void do_generateY( const RealGridX1d<real_type>& gy, thrust::host_vector<real_type>& weights, thrust::host_vector<real_type>& abscissas) const =0;
    virtual unsigned do_Nx_new( unsigned Nx_old, real_type fx) const =0;
    virtual unsigned do_Ny_new( unsigned Ny_old, real_type fy) const =0;
    virtual real_type do_fx_new( unsigned Nx_old, real_type fx) const =0;
    virtual real_type do_fy_new( unsigned Ny_old, real_type fy) const =0;
};
 
template<class real_type>
struct RealIdentityXRefinement : public aRealRefinementX2d<real_type>
{
    virtual RealIdentityXRefinement* clone()const override final{
        return new RealIdentityXRefinement(*this);
    }
    private:
    virtual void do_generateX( const RealGrid1d<real_type>& g, unsigned nodeXX, thrust::host_vector<real_type>& weights, thrust::host_vector<real_type>& abscissas) const override final{
        weights=dg::create::weights(g);
        abscissas = g.abscissas()[0];
    }
    virtual void do_generateY( const RealGridX1d<real_type>& g, thrust::host_vector<real_type>& weights, thrust::host_vector<real_type>& abscissas) const override final{
        weights=dg::create::weights(g);
        abscissas = g.abscissas()[0];
    }
    virtual unsigned do_Nx_new( unsigned Nx_old, real_type fx) const override final{ return Nx_old; }
    virtual unsigned do_Ny_new( unsigned Ny_old, real_type fy) const override final{ return Ny_old; }
    virtual real_type do_fx_new( unsigned Nx_old, real_type fx) const override final{ return fx; }
    virtual real_type do_fy_new( unsigned Ny_old, real_type fy) const override final{ return fy; }
};
 
template<class real_type>
struct RealEquidistXRefinement : public aRealRefinementX2d<real_type>
{
    RealEquidistXRefinement( unsigned add_x, unsigned add_y, unsigned howmanyX=1, unsigned howmanyY=1): add_x_(add_x), howm_x_(howmanyX), add_y_(add_y), howm_y_(howmanyY){ }
    virtual RealEquidistXRefinement* clone()const override final{return new RealEquidistXRefinement(*this);}
    private:
    unsigned add_x_, howm_x_, add_y_, howm_y_;
    virtual void do_generateX( const RealGrid1d<real_type>& gx, unsigned nodeXX, thrust::host_vector<real_type>& weights, thrust::host_vector<real_type>& abscissas) const override final
    {
        RealEquidistRefinement<real_type> equi(add_x_, nodeXX, howm_x_);
        equi.generate(gx,weights,abscissas);
    }
    virtual void do_generateY( const RealGridX1d<real_type>& g, thrust::host_vector<real_type>& weights, thrust::host_vector<real_type>& abscissas) const override final
    {
        RealEquidistRefinement<real_type> equi0(add_y_,0,howm_y_);
        if( add_y_ == 0 || howm_y_ == 0) {
            equi0.generate(g.grid(), weights, abscissas);
            return;
        }
        if( g.f() == 0) {
            equi0.generate( RealGrid1d<real_type>( g.x0(), g.x1(), g.n(), g.N(), dg::PER), weights, abscissas);
            return;
        }
        thrust::host_vector<real_type> w1, w2, w3;
        thrust::host_vector<real_type> a1, a2, a3;
        unsigned node1 = g.outer_N();
        RealEquidistRefinement<real_type> equi1(add_y_, node1, howm_y_);
        equi1.generate( RealGrid1d<real_type>(g.x0()                  ,g.x0()+g.outer_N()*g.h(), g.n(), g.outer_N(), dg::DIR), w1,a1); //left side
        equi0.generate( RealGrid1d<real_type>(g.x0()+g.outer_N()*g.h(),g.x1()-g.outer_N()*g.h(), g.n(), g.inner_N(), dg::PER), w2,a2);//inner side
        equi0.generate( RealGrid1d<real_type>(g.x1()-g.outer_N()*g.h(),g.x1()                  , g.n(), g.outer_N(), dg::DIR), w3,a3);//right side
        //now combine and unnormalize weights
        thrust::host_vector<real_type> wtot( w1.size() + w2.size() + w3.size()), atot( wtot);
        for( unsigned i=0; i<w1.size() ; i++)
            wtot[i]                     = w1[i]*equi1.N_new( g.outer_N(), dg::DIR)/g.outer_N();
        for( unsigned i=0; i<w2.size(); i++)
            wtot[w1.size()+i]           = w2[i]*equi0.N_new( g.inner_N(), dg::PER)/g.inner_N();
        for( unsigned i=0; i<w3.size(); i++)
            wtot[w1.size()+w2.size()+i] = w3[i]*equi0.N_new( g.outer_N(), dg::DIR)/g.outer_N();
        weights = wtot;
        abscissas = detail::normalize_weights_and_compute_abscissas( g.grid(), weights);
    }
    virtual unsigned do_Ny_new( unsigned Ny, real_type fy) const override final{
        if( fy==0 ) return Ny + 2*add_y_;
        return Ny + 4*add_y_;
    }
    virtual unsigned do_Nx_new( unsigned Nx, real_type fx) const override final{
        if( fx==0 ) return Nx + add_x_;
        return Nx + 2*add_x_;
    }
    virtual real_type do_fx_new( unsigned Nx, real_type fx) const override final{
        if( fx==0 ) return 0;
        return (fx*(real_type)Nx + (real_type)add_x_)/(real_type)(Nx+2.*add_x_);
    }
    virtual real_type do_fy_new( unsigned Ny, real_type fy) const override final{
        if( fy==0 ) return 0;
        return (fy*(real_type)Ny + (real_type)add_y_)/(real_type)(Ny+4.*add_y_);
    }
};
 
template<class real_type>
struct RealExponentialXRefinement : public aRealRefinementX2d<real_type>
{
    RealExponentialXRefinement( unsigned add_x, unsigned add_y, unsigned howmanyX=1, unsigned howmanyY=1): add_x_(add_x), howm_x_(howmanyX), add_y_(add_y), howm_y_(howmanyY){ }
    virtual RealExponentialXRefinement* clone()const{return new RealExponentialXRefinement(*this);}
    private:
    unsigned add_x_, howm_x_, add_y_, howm_y_;
    virtual void do_generateX( const RealGrid1d<real_type>& gx, unsigned nodeXX, thrust::host_vector<real_type>& weights, thrust::host_vector<real_type>& abscissas) const override final
    {
        RealEquidistRefinement<real_type> equi(add_x_, nodeXX, howm_x_);
        equi.generate(gx,weights,abscissas);
    }
    virtual void do_generateY( const RealGridX1d<real_type>& g, thrust::host_vector<real_type>& weights, thrust::host_vector<real_type>& abscissas) const override final
    {
        RealExponentialRefinement<real_type> expo0( add_x_, 0);
        if( add_y_ == 0) { return expo0.generate( g.grid(), weights, abscissas); }
        if( g.f()  == 0) { return expo0.generate( RealGrid1d<real_type>( g.x0(), g.x1(), g.n(), g.N(), dg::PER), weights, abscissas); }
        thrust::host_vector<real_type> w1, w2, w3;
        thrust::host_vector<real_type> a1, a2, a3;
        unsigned node1 = g.outer_N();
        RealExponentialRefinement<real_type> expo1( add_y_, node1);
        expo1.generate( RealGrid1d<real_type>(g.x0(),g.x1(),g.n(), g.outer_N(), dg::DIR), w1,a1); //left side
        expo0.generate( RealGrid1d<real_type>(g.x0(),g.x1(),g.n(), g.inner_N(), dg::PER), w2,a2); //inner side
        expo0.generate( RealGrid1d<real_type>(g.x0(),g.x1(),g.n(), g.outer_N(), dg::DIR), w3,a3); //right side
        //now combine unnormalized weights
        thrust::host_vector<real_type> wtot( g.size() + 4*g.n()*add_x_);
        for( unsigned i=0; i<w1.size() ; i++)
            wtot[i] = w1[i];
        for( unsigned i=0; i<w2.size(); i++)
            wtot[w1.size()+i] = w2[i];
        for( unsigned i=0; i<w3.size(); i++)
            wtot[w1.size()+w2.size()+i] = w3[i];
        weights = wtot;
 
        abscissas = detail::normalize_weights_and_compute_abscissas( g.grid(), weights);
    }
    virtual unsigned do_Ny_new( unsigned Ny, real_type fy) const override final{
        if( fy==0 ) return Ny + 2*add_y_;
        return Ny + 4*add_y_;
    }
    virtual unsigned do_Nx_new( unsigned Nx, real_type fx) const override final{
        if( fx==0 ) return Nx + add_x_;
        return Nx + 2*add_x_;
    }
    virtual real_type do_fx_new( unsigned Nx, real_type fx) const override final{
        if( fx==0 ) return 0;
        return (fx*(real_type)Nx + (real_type)add_x_)/(real_type)(Nx+2.*add_x_);
    }
    virtual real_type do_fy_new( unsigned Ny, real_type fy) const override final{
        if( fy==0 ) return 0;
        return (fy*(real_type)Ny + (real_type)add_y_)/(real_type)(Ny+4.*add_y_);
    }
};
 
using aRefinementX2d            = dg::aRealRefinementX2d<double>;
using IdentityXRefinement       = dg::RealIdentityXRefinement<double>;
using EquidistXRefinement       = dg::RealEquidistXRefinement<double>;
using ExponentialXRefinement    = dg::RealExponentialXRefinement<double>;
 
 
template<class real_type>
struct RealCartesianRefinedGridX2d : public dg::aRealGeometryX2d<real_type>
{
    RealCartesianRefinedGridX2d( const aRealRefinementX2d<real_type>& ref,
            real_type x0, real_type x1, real_type y0, real_type y1,
            real_type fx, real_type fy,
            unsigned n, unsigned Nx, unsigned Ny,
            bc bcx = dg::PER, bc bcy = dg::PER) : dg::aGeometryX2d( x0, x1, y0, y1,
                ref.fx_new(Nx, fx), ref.fy_new(Ny, fy), n, ref.nx_new(Nx, fx), ref.ny_new(Ny, fy), bcx, bcy), w_(2), abs_(2)
    {
        RealGridX2d<real_type> g( x0,x1,y0,y1,fx,fy,n,Nx,Ny,bcx,bcy);
        ref.generate(g,w_[0],w_[1],abs_[0],abs_[1]);
    }
 
    virtual RealCartesianRefinedGridX2d* clone()const override final{return new RealCartesianRefinedGridX2d(*this);}
    private:
    std::vector<thrust::host_vector<real_type> > w_,abs_;
    virtual SparseTensor<thrust::host_vector<real_type> > do_compute_metric()const override final{
        SparseTensor<thrust::host_vector<real_type> > t(*this);
        t.values().push_back( w_[0]);
        t.values().push_back( w_[1]);
        dg::blas1::pointwiseDot( w_[0], w_[0], t.values()[2]);
        dg::blas1::pointwiseDot( w_[1], w_[1], t.values()[3]);
        t.idx(0,0)=2, t.idx(1,1)=3;
        return t;
    }
    virtual SparseTensor<thrust::host_vector<real_type> > do_compute_jacobian()const override final{
        SparseTensor<thrust::host_vector<real_type> > t(*this);
        t.values().push_back( w_[0]);
        t.values().push_back( w_[1]);
        t.idx(0,0)=2, t.idx(1,1)=3;
        return t;
    }
    virtual std::vector<thrust::host_vector<real_type> > do_compute_map()const override final{
        return abs_;
    }
};
 
template<class real_type>
struct RealCartesianRefinedGridX3d : public dg::aRealGeometryX3d<real_type>
{
    RealCartesianRefinedGridX3d( const aRealRefinementX2d<real_type>& ref,
            real_type x0, real_type x1, real_type y0, real_type y1, real_type z0, real_type z1,
            real_type fx, real_type fy,
            unsigned n, unsigned Nx, unsigned Ny, unsigned Nz,
            bc bcx = dg::PER, bc bcy = dg::PER, bc bcz = dg::PER) : dg::aGeometryX3d(
                x0, x1, y0, y1,z0,z1,
                ref.fx_new(Nx, fx), ref.fy_new(Ny, fy),
                n, ref.nx_new(Nx, fx), ref.ny_new(Ny, fy), Nz,
                bcx, bcy, bcz), w_(2), abs_(2)
    {
        RealGridX2d<real_type> g( x0,x1,y0,y1,fx,fy,n,Nx,Ny,bcx,bcy);
        ref.generate(g,w_[0],w_[1],abs_[0],abs_[1]);
        //lift to 3d
        w_[0].resize(this->size()), w_[1].resize(this->size()), abs_[0].resize(this->size()), abs_[1].resize(this->size());
        unsigned size2d=this->n()*this->n()*this->Nx()*this->Ny();
        for( unsigned i=1; i<Nz; i++)
            for(unsigned k=0; k<size2d; k++)
            {
                w_[0][i*size2d+k]=w_[0][k];
                w_[1][i*size2d+k]=w_[1][k];
                abs_[0][i*size2d+k]=abs_[0][k];
                abs_[1][i*size2d+k]=abs_[1][k];
            }
    }
 
    virtual RealCartesianRefinedGridX3d* clone()const{return new RealCartesianRefinedGridX3d(*this);}
    private:
    std::vector<thrust::host_vector<real_type> > w_,abs_;
    virtual SparseTensor<thrust::host_vector<real_type> > do_compute_metric()const override final {
        SparseTensor<thrust::host_vector<real_type> > t(*this);
        t.values().push_back( w_[0]);
        t.values().push_back( w_[1]);
        dg::blas1::pointwiseDot( w_[0], w_[0], t.values()[2]);
        dg::blas1::pointwiseDot( w_[1], w_[1], t.values()[3]);
        t.idx(0,0)=2, t.idx(1,1)=3;
        return t;
    }
    virtual SparseTensor<thrust::host_vector<real_type> > do_compute_jacobian()const override final {
        SparseTensor<thrust::host_vector<real_type> > t(*this);
        t.values().push_back( w_[0]);
        t.values().push_back( w_[1]);
        t.idx(0,0)=2, t.idx(1,1)=3;
        return t;
    }
    virtual std::vector<thrust::host_vector<real_type> > do_compute_map()const override final {
        return abs_;
    }
};
 
using CartesianRefinedGridX2d = dg::RealCartesianRefinedGridX2d<double>;
using CartesianRefinedGridX3d = dg::RealCartesianRefinedGridX3d<double>;
 
 
}//namespace dg