Fast Methods for Cosmological Simulations
FastSim serves as a tool for quick N-body simulations in modified gravity.
frozen_flow.cpp
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1 
9 #include "frozen_flow.hpp"
10 #include "core_app.h"
11 #include "core_mesh.h"
12 #include "integration.hpp"
13 #include "params.hpp"
14 
15 App_Var_FF::App_Var_FF(const Sim_Param &sim):
16  App_Var<Particle_v<FTYPE_t>>(sim, "FF", "Frozen-flow approximation") {}
17 
18 void App_Var_FF::upd_pos()
19 {// Leapfrog method for frozen-flow
20  auto kick_step = [&](){ kick_step_no_momentum(sim.cosmo, a_half(), particles, app_field); };
21  stream_kick_stream(da(), particles, kick_step, sim.box_opt.mesh_num);
22 }
App_Var
class containing core variables and methods for approximations
Definition: app_var.hpp:41
stream_kick_stream
void stream_kick_stream(const double da, std::vector< Particle_v< double >> &particles, std::function< void()> kick_step, size_t per)
Definition: integration.cpp:24
Particle_v
class handling particles (position only)
Definition: class_particles.hpp:55
Sim_Param::box_opt
Box_Opt box_opt
Definition: params.hpp:202
Sim_Param
: class storing simulation parameters
Definition: params.hpp:193
kick_step_no_momentum
void kick_step_no_momentum(const Cosmo_Param &cosmo, const double a, std::vector< Particle_v< double >> &particles, const std::vector< Mesh > &vel_field)
Definition: integration.cpp:32
integration.hpp
functions for integration of particle trajectories
App_Var< Particle_v< double > >::app_field
std::vector< Mesh > app_field
Definition: app_var.hpp:63
Sim_Param::cosmo
Cosmo_Param cosmo
Definition: params.hpp:206
core_app.h
interface for common functions for all types of approximations
frozen_flow.hpp
frozen-flow approximation interface
params.hpp
various simulation parameters
App_Var< Particle_v< double > >::particles
std::vector< Particle_v< double > > particles
Definition: app_var.hpp:65
App_Var_FF::upd_pos
void upd_pos() override
Definition: frozen_flow.cpp:18
App_Var_FF::App_Var_FF
App_Var_FF(const Sim_Param &sim)
Definition: frozen_flow.cpp:15
core_mesh.h
basic functions to work with mesh
App_Var< Particle_v< double > >::a_half
double a_half()
App_Var< Particle_v< double > >::da
double da()
Box_Opt::mesh_num
size_t mesh_num
Definition: params.hpp:58
App_Var< Particle_v< double > >::sim
const Sim_Param & sim
Definition: app_var.hpp:59