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#ifndef INJECTOR_MOMENTUM_H_
#define INJECTOR_MOMENTUM_H_
#include <AMReX_Gpu.H>
#include <AMReX_Dim3.H>
#include <GpuParser.H>
#include <CustomMomentumProb.H>
// struct whose getMomentum returns constant momentum.
struct InjectorMomentumConstant
{
InjectorMomentumConstant (amrex::Real a_ux, amrex::Real a_uy, amrex::Real a_uz) noexcept
: m_ux(a_ux), m_uy(a_uy), m_uz(a_uz) {}
AMREX_GPU_HOST_DEVICE
amrex::XDim3
getMomentum (amrex::Real, amrex::Real, amrex::Real) const noexcept
{
return amrex::XDim3{m_ux,m_uy,m_uz};
}
private:
amrex::Real m_ux, m_uy, m_uz;
};
// struct whose getMomentum returns momentum for 1 particle, from random
// gaussian distribution.
struct InjectorMomentumGaussian
{
InjectorMomentumGaussian (amrex::Real a_ux_m, amrex::Real a_uy_m,
amrex::Real a_uz_m, amrex::Real a_ux_th,
amrex::Real a_uy_th, amrex::Real a_uz_th) noexcept
: m_ux_m(a_ux_m), m_uy_m(a_uy_m), m_uz_m(a_uz_m),
m_ux_th(a_ux_th), m_uy_th(a_uy_th), m_uz_th(a_uz_th)
{}
AMREX_GPU_HOST_DEVICE
amrex::XDim3
getMomentum (amrex::Real x, amrex::Real y, amrex::Real z) const noexcept
{
return amrex::XDim3{amrex::RandomNormal(m_ux_m, m_ux_th),
amrex::RandomNormal(m_uy_m, m_uy_th),
amrex::RandomNormal(m_uz_m, m_uz_th)};
}
private:
amrex::Real m_ux_m, m_uy_m, m_uz_m;
amrex::Real m_ux_th, m_uy_th, m_uz_th;
};
// struct whose getMomentum returns momentum for 1 particle, for
// radial expansion
struct InjectorMomentumRadialExpansion
{
InjectorMomentumRadialExpansion (amrex::Real a_u_over_r) noexcept
: u_over_r(a_u_over_r)
{}
AMREX_GPU_HOST_DEVICE
amrex::XDim3
getMomentum (amrex::Real x, amrex::Real y, amrex::Real z) const noexcept
{
return {x*u_over_r, y*u_over_r, z*u_over_r};
}
private:
amrex::Real u_over_r;
};
// struct whose getMomentumm returns local momentum computed from parser.
struct InjectorMomentumParser
{
InjectorMomentumParser (WarpXParser const& a_ux_parser,
WarpXParser const& a_uy_parser,
WarpXParser const& a_uz_parser) noexcept
: m_ux_parser(a_ux_parser), m_uy_parser(a_uy_parser),
m_uz_parser(a_uz_parser) {}
AMREX_GPU_HOST_DEVICE
amrex::XDim3
getMomentum (amrex::Real x, amrex::Real y, amrex::Real z) const noexcept
{
return amrex::XDim3{m_ux_parser(x,y,z),m_uy_parser(x,y,z),m_uz_parser(x,y,z)};
}
GpuParser m_ux_parser, m_uy_parser, m_uz_parser;
};
// Base struct for momentum injector.
// InjectorMomentum contains a union (called Object) that holds any one
// instance of:
// - InjectorMomentumConstant : to generate constant density;
// - InjectorMomentumGaussian : to generate gaussian distribution;
// - InjectorMomentumRadialExpansion: to generate radial expansion;
// - InjectorMomentumParser : to generate momentum from parser;
// The choice is made at runtime, depending in the constructor called.
// This mimics virtual functions, except the struct is stored in managed memory
// and member functions are made __host__ __device__ to run on CPU and GPU.
// This struct inherits from amrex::Gpu::Managed to provide new and delete
// operators in managed memory when running on GPU. Nothing special on CPU.
struct InjectorMomentum
: public amrex::Gpu::Managed
{
// This constructor stores a InjectorMomentumConstant in union object.
InjectorMomentum (InjectorMomentumConstant* t,
amrex::Real a_ux, amrex::Real a_uy, amrex::Real a_uz)
: type(Type::constant),
object(t, a_ux, a_uy, a_uz)
{ }
// This constructor stores a InjectorMomentumParser in union object.
InjectorMomentum (InjectorMomentumParser* t,
WarpXParser const& a_ux_parser,
WarpXParser const& a_uy_parser,
WarpXParser const& a_uz_parser)
: type(Type::parser),
object(t, a_ux_parser, a_uy_parser, a_uz_parser)
{ }
// This constructor stores a InjectorMomentumGaussian in union object.
InjectorMomentum (InjectorMomentumGaussian* t,
amrex::Real a_ux_m, amrex::Real a_uy_m, amrex::Real a_uz_m,
amrex::Real a_ux_th, amrex::Real a_uy_th, amrex::Real a_uz_th)
: type(Type::gaussian),
object(t,a_ux_m,a_uy_m,a_uz_m,a_ux_th,a_uy_th,a_uz_th)
{ }
// This constructor stores a InjectorMomentumCustom in union object.
InjectorMomentum (InjectorMomentumCustom* t,
std::string const& a_species_name)
: type(Type::custom),
object(t, a_species_name)
{ }
// This constructor stores a InjectorMomentumRadialExpansion in union object.
InjectorMomentum (InjectorMomentumRadialExpansion* t,
amrex::Real u_over_r)
: type(Type::radial_expansion),
object(t, u_over_r)
{ }
// Explicitly prevent the compiler from generating copy constructors
// and copy assignment operators.
InjectorMomentum (InjectorMomentum const&) = delete;
InjectorMomentum (InjectorMomentum&&) = delete;
void operator= (InjectorMomentum const&) = delete;
void operator= (InjectorMomentum &&) = delete;
~InjectorMomentum ();
std::size_t sharedMemoryNeeded () const noexcept;
// call getMomentum from the object stored in the union
// (the union is called Object, and the instance is called object).
AMREX_GPU_HOST_DEVICE
amrex::XDim3
getMomentum (amrex::Real x, amrex::Real y, amrex::Real z) const noexcept
{
switch (type)
{
case Type::parser:
{
return object.parser.getMomentum(x,y,z);
}
case Type::gaussian:
{
return object.gaussian.getMomentum(x,y,z);
}
case Type::constant:
{
return object.constant.getMomentum(x,y,z);
}
case Type::radial_expansion:
{
return object.radial_expansion.getMomentum(x,y,z);
}
case Type::custom:
{
return object.custom.getMomentum(x,y,z);
}
default:
{
amrex::Abort("InjectorMomentum: unknown type");
return {0.0,0.0,0.0};
}
}
}
private:
enum struct Type { constant, custom, gaussian, radial_expansion, parser };
Type type;
// An instance of union Object constructs and stores any one of
// the objects declared (constant or custom or gaussian or
// radial_expansion or parser).
union Object {
Object (InjectorMomentumConstant*,
amrex::Real a_ux, amrex::Real a_uy, amrex::Real a_uz) noexcept
: constant(a_ux,a_uy,a_uz) {}
Object (InjectorMomentumCustom*,
std::string const& a_species_name) noexcept
: custom(a_species_name) {}
Object (InjectorMomentumGaussian*,
amrex::Real a_ux_m, amrex::Real a_uy_m,
amrex::Real a_uz_m, amrex::Real a_ux_th,
amrex::Real a_uy_th, amrex::Real a_uz_th) noexcept
: gaussian(a_ux_m,a_uy_m,a_uz_m,a_ux_th,a_uy_th,a_uz_th) {}
Object (InjectorMomentumRadialExpansion*,
amrex::Real u_over_r) noexcept
: radial_expansion(u_over_r) {}
Object (InjectorMomentumParser*,
WarpXParser const& a_ux_parser,
WarpXParser const& a_uy_parser,
WarpXParser const& a_uz_parser) noexcept
: parser(a_ux_parser, a_uy_parser, a_uz_parser) {}
InjectorMomentumConstant constant;
InjectorMomentumCustom custom;
InjectorMomentumGaussian gaussian;
InjectorMomentumRadialExpansion radial_expansion;
InjectorMomentumParser parser;
};
Object object;
};
#endif
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