AdamsBashforth2.hpp

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/*------------------------------- phasicFlow ---------------------------------
      O        C enter of
     O O       E ngineering and
    O   O      M ultiscale modeling of
   OOOOOOO     F luid flow       
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Licence:
  This file is part of phasicFlow code. It is a free software for simulating 
  granular and multiphase flows. You can redistribute it and/or modify it under
  the terms of GNU General Public License v3 or any other later versions. 
 
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#ifndef __AdamsBashforth2_hpp__
#define __AdamsBashforth2_hpp__
 
 
#include "integration.hpp"
#include "pointFields.hpp"
 
namespace pFlow
{
 
 
class AdamsBashforth2
:
    public integration
{
protected:
 
    realx3PointField_D& dy1_;
 
    using rpIntegration = Kokkos::RangePolicy<
            DefaultExecutionSpace,
            Kokkos::Schedule<Kokkos::Static>,
            Kokkos::IndexType<int32>
            >;
public:
 
    // type info
    TypeInfo("AdamsBashforth2");
 
        AdamsBashforth2(
            const word& baseName,
            repository& owner,
            const pointStructure& pStruct,
            const word& method);
 
        virtual ~AdamsBashforth2()=default;
 
        // - add a virtual constructor 
        add_vCtor(
            integration,
            AdamsBashforth2,
            word);
 
 
        bool predict(real UNUSED(dt), realx3Vector_D& UNUSED(y), realx3Vector_D& UNUSED(dy)) override;
 
        bool correct(real dt, realx3Vector_D& y, realx3Vector_D& dy) override;
 
        bool setInitialVals(
            const int32IndexContainer& newIndices,
            const realx3Vector& y) override;
 
        bool needSetInitialVals()const override
        {
            return false;
        }
 
        uniquePtr<integration> clone()const override
        {
            return makeUnique<AdamsBashforth2>(*this);
        }
 
        bool intAll(real dt, realx3Vector_D& y, realx3Vector_D& dy, range activeRng);
 
        template<typename activeFunctor>
        bool intRange(real dt, realx3Vector_D& y, realx3Vector_D& dy, activeFunctor activeP );
 
};
 
template<typename activeFunctor>
bool pFlow::AdamsBashforth2::intRange(
    real dt, 
    realx3Vector_D& y,
    realx3Vector_D& dy,
    activeFunctor activeP )
{
 
    auto d_dy = dy.deviceVectorAll();
    auto d_y  = y.deviceVectorAll();
    auto d_dy1= dy1_.deviceVectorAll();
    auto activeRng = activeP.activeRange();
 
    Kokkos::parallel_for(
        "AdamsBashforth2::correct",
        rpIntegration (activeRng.first, activeRng.second),
        LAMBDA_HD(int32 i){
            if( activeP(i))
            {
                d_y[i] +=  dt*(static_cast<real>(3.0 / 2.0) * d_dy[i] - static_cast<real>(1.0 / 2.0) * d_dy1[i]);
                d_dy1[i] = d_dy[i];
            }
        });
    Kokkos::fence();
 
 
    return true;
}
 
} // pFlow
 
#endif //__integration_hpp__