Fmv Class Reference

Derived class from Fmv0, implementing specific boundary conditions and initial data routines for the COSMOS simulation. More...

#include <cosmos_d.h>

Inheritance diagram for Fmv:

Collaboration diagram for Fmv:

Public Member Functions
	Fmv ()
	Constructor for the Fmv class.
virtual	~Fmv ()
	Destructor for the Fmv class.
virtual void	set_boundary ()
	Sets the boundary conditions for all evolved grid functions.
void	initial_data (double t, double mu, double kk, double xi2, double xi3, double w3)
	Sets up the initial data for the simulation.
void	initial_nonsph (double t, double mu, double kk, double xi2, double xi3, double w3)
	Sets the initial data for the geometric (BSSN) variables with non-spherical perturbations.
void	set_initial_scalar (double mus, double kks, double xi2s, double xi3s)
	Sets the initial data for the scalar field variables.
void	set_initial_fluid (double t)
	Sets the initial data for the fluid variables (if enabled).
Public Member Functions inherited from Fmv0
	Fmv0 (int tabs, int jupper, int jlower, int kupper, int klower, int lupper, int llower, double xupper, double xlower, double yupper, double ylower, double zupper, double zlower, double cfl_in, double etaa_in, double etab_in, double etabb_in, double KOep_in, int exg_in, double Hb_in, double fluidw_in, double kap_MUSCL_in, double b_minmod_in, double amp_in)
	Constructor for the Fmv0 class.
virtual	~Fmv0 ()
	Destructor for the Fmv0 class. Frees allocated memory.
virtual void	rhs (double dt, double t)
	Calculates the right-hand sides (RHS) of the BSSN evolution equations.
void	KOdiss (double ***q, double ***f)
	Applies Kreiss-Oliger numerical dissipation to evolved variables.
double	funcf (double x)
	Coordinate mapping function from logical coordinate (e.g., j*dx) to physical coordinate.
double	df (double x)
	First derivative of the coordinate mapping function funcf.
double	ddf (double x)
	Second derivative of the coordinate mapping function funcf.
double	dddf (double x)
	Third derivative of the coordinate mapping function funcf.
int	get_tab () const
	Get the number of buffer zones.
double	get_cfl () const
	Get the CFL factor.
bool	get_fluidevo () const
	Check if fluid evolution is enabled (based on fluidw perhaps).
int &	set_bflag (int l, int k, int j)
	Set the boundary flag at a specific grid point. Returns a reference.
int	get_bflag (int l, int k, int j) const
	Get the boundary flag at a specific grid point.
double ***	matrix (long nrl, long nrh, long ncl, long nch, long ndl, long ndh)
	Allocates memory for a 3D grid function array.
void	free_matrix (double ***m, long nrl, long nrh, long ncl, long nch, long ndl, long ndh)
	Frees memory allocated by matrix().

Additional Inherited Members
Public Attributes inherited from Fmv0
int	tab
	Number of buffer/ghost zones.
int	jmin
	Minimum physical grid index in x.
int	jmax
	Maximum physical grid index in x.
double	xmin
	Minimum coordinate value in x.
double	xmax
	Maximum coordinate value in x.
double	dx
	Grid spacing in x (uniform logical grid).
double	cfl
	CFL factor for time step calculation.
double	etaa
	Gauge parameter eta for 1+log lapse.
double	etab
	Gauge parameter eta for Gamma-driver shift.
double	etabb
	Gauge parameter eta_b (or similar) for Gamma-driver shift.
double	KOep
	Kreiss-Oliger dissipation coefficient epsilon.
double	Hb
	Initial Hubble parameter.
double	fluidw
	Fluid equation of state parameter w (if fluid enabled).
double	kap_MUSCL
	MUSCL reconstruction parameter kappa (if fluid enabled).
double	b_minmod
	Minmod limiter parameter b (if fluid enabled).
int	exg
	Grid size for excision region (if enabled).
double	tmax
	Maximum simulation time.
double	amp
	Grid stretching parameter for coordinate mapping.
double ***	alp
	Pointer to the lapse function grid data.
double ***	betax
	Pointer to the shift vector component beta^x grid data.
Protected Member Functions inherited from Fmv0
double	D1x (double ***f, int l, int k, int j)
	Calculates spatial derivatives (e.g., first derivative in x).
void	calculate_christoffel (int l, int k, int j)
	Calculates Christoffel symbols or connection functions.
void	calculate_ricci (int l, int k, int j)
	Calculates Ricci tensor components.
void	calculate_matter_sources (int l, int k, int j)
	Calculates matter source terms (Stress-Energy Tensor T_munu).

Detailed Description

Derived class from Fmv0, implementing specific boundary conditions and initial data routines for the COSMOS simulation.

Overrides virtual functions like set_boundary and provides methods like initial_data or initial_nonsph.

Constructor & Destructor Documentation

Fmv()

Fmv::Fmv

(

)

Constructor for the Fmv class.

Passes most parameters up to the Fmv0 constructor. May add specific parameters for this class if needed.

Parameters

[in]

params

Parameters identical to Fmv0 constructor.

~Fmv()

virtual Fmv::~Fmv ( )

virtual

Destructor for the Fmv class.

Member Function Documentation

initial_data()

void Fmv::initial_data	(	double	t,
		double	mu,
		double	kk,
		double	xi2,
		double	xi3,
		double	w3 )

Sets up the initial data for the simulation.

Parameters

t	Initial time (usually 0).
mu	Initial geometric perturbation amplitude.
kk	Initial geometric perturbation scale/wavenumber.
xi2	Initial geometric perturbation non-spherical parameter.
xi3	Initial geometric perturbation non-spherical parameter.
w3	Initial geometric perturbation additional parameter.

Note

Calls helper functions like initial_nonsph, set_initial_scalar.

initial_nonsph()

void Fmv::initial_nonsph	(	double	t,
		double	mu,
		double	kk,
		double	xi2,
		double	xi3,
		double	w3 )

Sets the initial data for the geometric (BSSN) variables with non-spherical perturbations.

Parameters

t	Initial time.
mu	Amplitude parameter.
kk	Scale/wavenumber parameter.
xi2	Non-spherical parameter.
xi3	Non-spherical parameter.
w3	Additional parameter.

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set_boundary()

virtual void Fmv::set_boundary ( )

virtual

Sets the boundary conditions for all evolved grid functions.

Implements the specific boundary logic (e.g., periodic, reflection, outflow) for the COSMOS simulation setup. Called typically after each RK step.

set_initial_fluid()

void Fmv::set_initial_fluid

(

double

t

)

Sets the initial data for the fluid variables (if enabled).

Parameters

t	Initial time. // Add parameters relevant to fluid initial data if needed

set_initial_scalar()

void Fmv::set_initial_scalar	(	double	mus,
		double	kks,
		double	xi2s,
		double	xi3s )

Sets the initial data for the scalar field variables.

Parameters

mus	Amplitude parameter for scalar field perturbation.
kks	Scale/wavenumber parameter for scalar field perturbation.
xi2s	Non-spherical parameter for scalar field perturbation.
xi3s	Non-spherical parameter for scalar field perturbation.

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The documentation for this class was generated from the following file:

• cosmos_d.h