Detailed Description

Models the MSIS-00 atmosphere.

This is a wrapper for the NRL-MSIS-00 model 2001:

This C++ format model uses the NRLMSISE-00 C source code package - release 20020503

The NRLMSISE-00 model was developed by Mike Picone, Alan Hedin, and Doug Drob. They also wrote a NRLMSISE-00 distribution package in FORTRAN which is available at http://uap-www.nrl.navy.mil/models_web/msis/msis_home.htm

Dominik Brodowski implemented and maintains this C version. You can reach him at devel.nosp@m.@bro.nosp@m.do.de. See the file "DOCUMENTATION" for details, and check http://www.brodo.de/english/pub/nrlmsise/index.html for updated releases of this package.

Author: David Culp

Definition at line 83 of file FGMSIS.h.

#include <FGMSIS.h>

Inheritance diagram for FGMSIS:

Collaboration diagram for FGMSIS:

Public Member Functions
	FGMSIS (FGFDMExec *)
	Constructor.

	~FGMSIS ()
	Destructor.

virtual double	GetDensity (double altitude) const
	Returns the density in slugs/ft^3 at a given altitude in ft.

double	GetDensity (double altitude) const override
	Returns the density in slugs/ft^3 at a given altitude in ft.

virtual double	GetDensity (void) const
	Returns the density in slugs/ft^3.

double	GetPressure (double altitude) const override
	Returns the pressure at a specified altitude in psf.

virtual double	GetPressure (double altitude) const=0
	Returns the pressure at a specified altitude in psf.

virtual double	GetPressure (void) const
	Returns the pressure in psf.

virtual double	GetSoundSpeed (double altitude) const
	Returns the speed of sound in ft/sec at a given altitude in ft.

double	GetSoundSpeed (double altitude) const override
	Returns the speed of sound in ft/sec at a given altitude in ft.

virtual double	GetSoundSpeed (void) const
	Returns the speed of sound in ft/sec.

virtual double	GetTemperature () const
	Returns the actual, modeled temperature at the current altitude in degrees Rankine.

double	GetTemperature (double altitude) const override
	Returns the actual modeled temperature in degrees Rankine at a specified altitude.

virtual double	GetTemperature (double altitude) const=0
	Returns the actual modeled temperature in degrees Rankine at a specified altitude.

bool	InitModel (void) override
	Runs the MSIS-00 atmosphere model; called by the Executive Can pass in a value indicating if the executive is directing the simulation to Hold.

bool	Load (Element *el) override

Public Member Functions inherited from FGStandardAtmosphere
	FGStandardAtmosphere (FGFDMExec *)
	Constructor.

virtual	~FGStandardAtmosphere ()
	Destructor.

bool	InitModel (void) override

double	GetTemperature (double altitude) const override
	Returns the actual modeled temperature in degrees Rankine at a specified altitude.

virtual double	GetStdTemperature (double altitude) const
	Returns the standard temperature in degrees Rankine at a specified altitude.

virtual double	GetStdTemperatureSL () const
	Returns the standard sea level temperature in degrees Rankine.

virtual double	GetStdTemperatureRatio (double h) const
	Returns the ratio of the standard temperature at the supplied altitude over the standard sea level temperature.

virtual double	GetTemperatureBias (eTemperature to) const
	Returns the temperature bias over the sea level value in degrees Rankine.

virtual double	GetTemperatureDeltaGradient (eTemperature to) const
	Returns the temperature gradient to be applied on top of the standard temperature gradient.

void	SetTemperatureSL (double t, eTemperature unit=eFahrenheit) override
	Sets the Sea Level temperature, if it is to be different than the standard.

void	SetTemperature (double t, double h, eTemperature unit=eFahrenheit) override
	Sets the temperature at the supplied altitude, if it is to be different than the standard temperature.

virtual void	SetTemperatureBias (eTemperature unit, double t)
	Sets the temperature bias to be added to the standard temperature at all altitudes.

virtual void	SetSLTemperatureGradedDelta (eTemperature unit, double t)
	Sets a Sea Level temperature delta that is ramped out by 86 km.

virtual void	SetTemperatureGradedDelta (double t, double h, eTemperature unit=eFahrenheit)
	Sets the temperature delta value at the supplied altitude/elevation above sea level, to be added to the standard temperature and ramped out by 86 km.

virtual void	ResetSLTemperature ()
	This function resets the model to apply no bias or delta gradient to the temperature.

double	GetPressure (double altitude) const override
	Returns the pressure at a specified altitude in psf.

virtual double	GetStdPressure (double altitude) const
	Returns the standard pressure at the specified altitude.

void	SetPressureSL (ePressure unit, double pressure) override
	Sets the sea level pressure for modeling an off-standard pressure profile.

virtual void	ResetSLPressure ()
	Resets the sea level to the Standard sea level pressure, and recalculates dependent parameters so that the pressure calculations are standard.

virtual double	GetStdDensity (double altitude) const
	Returns the standard density at a specified altitude.

void	SetDewPoint (eTemperature unit, double dewpoint)
	Sets the dew point.

double	GetDewPoint (eTemperature to) const
	Returns the dew point.

void	SetVaporPressure (ePressure unit, double Pv)
	Sets the partial pressure of water vapor.

double	GetVaporPressure (ePressure to) const
	Returns the partial pressure of water vapor.

double	GetSaturatedVaporPressure (ePressure to) const
	Returns the saturated pressure of water vapor.

void	SetRelativeHumidity (double RH)
	Sets the relative humidity.

double	GetRelativeHumidity (void) const
	Returns the relative humidity in percent.

void	SetVaporMassFractionPPM (double frac)
	Sets the vapor mass per million of dry air mass units.

double	GetVaporMassFractionPPM (void) const
	Returns the vapor mass per million of dry air mass units (ppm).

virtual void	PrintStandardAtmosphereTable ()
	Prints the U.S. Standard Atmosphere table.

Public Member Functions inherited from FGAtmosphere
	FGAtmosphere (FGFDMExec *)
	Constructor.

virtual	~FGAtmosphere ()
	Destructor.

bool	Run (bool Holding) override
	Runs the atmosphere forces model; called by the Executive.

virtual double	GetTemperatureSL () const
	Returns the actual, modeled sea level temperature in degrees Rankine.

virtual double	GetTemperatureRatio () const
	Returns the ratio of the at-current-altitude temperature as modeled over the sea level value.

virtual double	GetTemperatureRatio (double h) const
	Returns the ratio of the temperature as modeled at the supplied altitude over the sea level value.

virtual double	GetPressureSL (ePressure to=ePSF) const

virtual double	GetPressureRatio (void) const
	Returns the ratio of at-altitude pressure over the sea level value.

virtual double	GetDensitySL (void) const
	Returns the sea level density in slugs/ft^3.

virtual double	GetDensityRatio (void) const
	Returns the ratio of at-altitude density over the sea level value.

virtual double	GetSoundSpeedSL (void) const
	Returns the sea level speed of sound in ft/sec.

virtual double	GetSoundSpeedRatio (void) const
	Returns the ratio of at-altitude sound speed over the sea level value.

virtual double	GetAbsoluteViscosity (void) const
	Returns the absolute viscosity.

virtual double	GetKinematicViscosity (void) const
	Returns the kinematic viscosity.

virtual double	GetDensityAltitude () const

virtual double	GetPressureAltitude () const

Public Member Functions inherited from FGModel
	FGModel (FGFDMExec *)
	Constructor.

	~FGModel () override
	Destructor.

virtual SGPath	FindFullPathName (const SGPath &path) const

FGFDMExec *	GetExec (void) const

const std::string &	GetName (void) const

unsigned int	GetRate (void) const
	Get the output rate for the model in frames.

void	SetPropertyManager (std::shared_ptr< FGPropertyManager > fgpm)

void	SetRate (unsigned int tt)
	Set the ouput rate for the model in frames.

Public Member Functions inherited from FGModelFunctions
std::string	GetFunctionStrings (const std::string &delimeter) const
	Gets the strings for the current set of functions.

std::string	GetFunctionValues (const std::string &delimeter) const
	Gets the function values.

std::shared_ptr< FGFunction >	GetPreFunction (const std::string &name)
	Get one of the "pre" function.

bool	Load (Element el, FGFDMExec fdmex, std::string prefix="")

void	PostLoad (Element el, FGFDMExec fdmex, std::string prefix="")

void	PreLoad (Element el, FGFDMExec fdmex, std::string prefix="")

void	RunPostFunctions (void)

void	RunPreFunctions (void)

Public Member Functions inherited from FGJSBBase
	FGJSBBase ()
	Constructor for FGJSBBase.

virtual	~FGJSBBase ()
	Destructor for FGJSBBase.

void	disableHighLighting (void)
	Disables highlighting in the console output.

Protected Member Functions
void	Calculate (double altitude) override
	Calculate the atmosphere for the given altitude.

void	Compute (double altitude, double &pression, double &temperature, double &density, double &Rair) const

Protected Member Functions inherited from FGStandardAtmosphere
void	Calculate (double altitude) override
	Calculate the atmosphere for the given altitude.

void	CalculateLapseRates ()
	Recalculate the lapse rate vectors when the temperature profile is altered in a way that would change the lapse rates, such as when a gradient is applied.

void	CalculatePressureBreakpoints (double SLpress)
	Calculate (or recalculate) the atmospheric pressure breakpoints at the altitudes in the standard temperature table.

void	CalculateStdDensityBreakpoints ()
	Calculate the atmospheric density breakpoints at the altitudes in the standard temperature table.

double	GeopotentialAltitude (double geometalt) const
	Convert a geometric altitude to a geopotential altitude.

double	GeometricAltitude (double geopotalt) const
	Convert a geopotential altitude to a geometric altitude.

double	CalculateDensityAltitude (double density, double geometricAlt) override
	Calculates the density altitude given any temperature or pressure bias.

double	CalculatePressureAltitude (double pressure, double geometricAlt) override
	Calculates the pressure altitude given any temperature or pressure bias.

double	CalculateVaporPressure (double temperature)
	Calculate the pressure of water vapor with the Magnus formula.

void	ValidateVaporMassFraction (double geometricAlt)
	Validate the value of the vapor mass fraction.

void	CalculateSLDensity (void)
	Calculate the SL density.

void	CalculateSLSoundSpeedAndDensity (void)
	Calculate the SL density and sound speed.

void	bind (void) override

void	Debug (int from) override

Protected Member Functions inherited from FGAtmosphere
double	ConvertToRankine (double t, eTemperature unit) const
	Converts to Rankine from one of several unit systems.

double	ConvertFromRankine (double t, eTemperature unit) const
	Converts from Rankine to one of several unit systems.

double	ConvertToPSF (double t, ePressure unit=ePSF) const
	Converts to PSF (pounds per square foot) from one of several unit systems.

double	ConvertFromPSF (double t, ePressure unit=ePSF) const
	Converts from PSF (pounds per square foot) to one of several unit systems.

double	ValidatePressure (double p, const std::string &msg, bool quiet=false) const
	Check that the pressure is within plausible boundaries.

double	ValidateTemperature (double t, const std::string &msg, bool quiet=false) const
	Check that the temperature is within plausible boundaries.

Protected Member Functions inherited from FGModel
bool	Upload (Element *el, bool preLoad)
	Uploads this model in memory.

Protected Attributes
double	day_of_year = 1.0

struct nrlmsise_flags	flags

struct nrlmsise_input	input

double	seconds_in_day = 0.0

Protected Attributes inherited from FGStandardAtmosphere
double	StdSLtemperature
	Standard sea level conditions.

double	StdSLdensity

double	StdSLpressure

double	StdSLsoundspeed

double	TemperatureBias

double	TemperatureDeltaGradient

double	GradientFadeoutAltitude

double	VaporMassFraction

double	SaturatedVaporPressure

FGTable	StdAtmosTemperatureTable

FGTable	MaxVaporMassFraction

std::vector< double >	LapseRates

std::vector< double >	PressureBreakpoints

std::vector< double >	StdPressureBreakpoints

std::vector< double >	StdDensityBreakpoints

std::vector< double >	StdLapseRates

Protected Attributes inherited from FGAtmosphere
double	SLtemperature = 1.8

double	SLdensity = 1.0

double	SLpressure = 1.0

double	SLsoundspeed = 1.0

double	Temperature = 1.8

double	Density = 0.0

double	Pressure = 0.0

double	Soundspeed = 0.0

double	PressureAltitude = 0.0

double	DensityAltitude = 0.0

double	Viscosity = 0.0

double	KinematicViscosity = 0.0

SGPropertyNode_ptr	atmosphere_node

SGPropertyNode_ptr	override_node

SGPropertyNode_ptr	override_temperature_node

SGPropertyNode_ptr	override_pressure_node

SGPropertyNode_ptr	override_density_node

double	Reng = Reng0

Protected Attributes inherited from FGModel
unsigned int	exe_ctr

FGFDMExec *	FDMExec

std::string	Name

std::shared_ptr< FGPropertyManager >	PropertyManager

unsigned int	rate

Protected Attributes inherited from FGModelFunctions
FGPropertyReader	LocalProperties

std::vector< std::shared_ptr< FGFunction > >	PostFunctions

std::vector< std::shared_ptr< FGFunction > >	PreFunctions

Additional Inherited Members
Public Types inherited from FGAtmosphere
enum	ePressure { eNoPressUnit =0 , ePSF , eMillibars , ePascals , eInchesHg }
	Enums for specifying pressure units. More...

enum	eTemperature { eNoTempUnit =0 , eFahrenheit , eCelsius , eRankine , eKelvin }
	Enums for specifying temperature units. More...

Public Types inherited from FGJSBBase
enum	{ eL = 1 , eM , eN }
	Moments L, M, N. More...

enum	{ eP = 1 , eQ , eR }
	Rates P, Q, R. More...

enum	{ eU = 1 , eV , eW }
	Velocities U, V, W. More...

enum	{ eX = 1 , eY , eZ }
	Positions X, Y, Z. More...

enum	{ ePhi = 1 , eTht , ePsi }
	Euler angles Phi, Theta, Psi. More...

enum	{ eDrag = 1 , eSide , eLift }
	Stability axis forces, Drag, Side force, Lift. More...

enum	{ eRoll = 1 , ePitch , eYaw }
	Local frame orientation Roll, Pitch, Yaw. More...

enum	{ eNorth = 1 , eEast , eDown }
	Local frame position North, East, Down. More...

enum	{ eLat = 1 , eLong , eRad }
	Locations Radius, Latitude, Longitude. More...

enum	{ inNone = 0 , inDegrees , inRadians , inMeters , inFeet }
	Conversion specifiers. More...

Static Public Member Functions inherited from FGJSBBase
static const std::string &	GetVersion (void)
	Returns the version number of JSBSim.

static constexpr double	KelvinToFahrenheit (double kelvin)
	Converts from degrees Kelvin to degrees Fahrenheit.

static constexpr double	CelsiusToRankine (double celsius)
	Converts from degrees Celsius to degrees Rankine.

static constexpr double	RankineToCelsius (double rankine)
	Converts from degrees Rankine to degrees Celsius.

static constexpr double	KelvinToRankine (double kelvin)
	Converts from degrees Kelvin to degrees Rankine.

static constexpr double	RankineToKelvin (double rankine)
	Converts from degrees Rankine to degrees Kelvin.

static constexpr double	FahrenheitToCelsius (double fahrenheit)
	Converts from degrees Fahrenheit to degrees Celsius.

static constexpr double	CelsiusToFahrenheit (double celsius)
	Converts from degrees Celsius to degrees Fahrenheit.

static constexpr double	CelsiusToKelvin (double celsius)
	Converts from degrees Celsius to degrees Kelvin.

static constexpr double	KelvinToCelsius (double kelvin)
	Converts from degrees Kelvin to degrees Celsius.

static constexpr double	FeetToMeters (double measure)
	Converts from feet to meters.

static bool	EqualToRoundoff (double a, double b)
	Finite precision comparison.

static bool	EqualToRoundoff (float a, float b)
	Finite precision comparison.

static bool	EqualToRoundoff (float a, double b)
	Finite precision comparison.

static bool	EqualToRoundoff (double a, float b)
	Finite precision comparison.

static constexpr double	Constrain (double min, double value, double max)
	Constrain a value between a minimum and a maximum value.

static constexpr double	sign (double num)

Public Attributes inherited from FGAtmosphere
struct JSBSim::FGAtmosphere::Inputs	in

const double	StdDaySLsoundspeed

Static Public Attributes inherited from FGAtmosphere
static constexpr double	StdDaySLtemperature = 518.67

static constexpr double	StdDaySLpressure = 2116.228

static constexpr double	SHRatio = 1.4

static constexpr double	StdDaySLdensity = StdDaySLpressure / (Reng0 * StdDaySLtemperature)

Static Public Attributes inherited from FGJSBBase
static char	highint [5] = {27, '[', '1', 'm', '\0' }
	highlights text

static char	halfint [5] = {27, '[', '2', 'm', '\0' }
	low intensity text

static char	normint [6] = {27, '[', '2', '2', 'm', '\0' }
	normal intensity text

static char	reset [5] = {27, '[', '0', 'm', '\0' }
	resets text properties

static char	underon [5] = {27, '[', '4', 'm', '\0' }
	underlines text

static char	underoff [6] = {27, '[', '2', '4', 'm', '\0' }
	underline off

static char	fgblue [6] = {27, '[', '3', '4', 'm', '\0' }
	blue text

static char	fgcyan [6] = {27, '[', '3', '6', 'm', '\0' }
	cyan text

static char	fgred [6] = {27, '[', '3', '1', 'm', '\0' }
	red text

static char	fggreen [6] = {27, '[', '3', '2', 'm', '\0' }
	green text

static char	fgdef [6] = {27, '[', '3', '9', 'm', '\0' }
	default text

static short	debug_lvl = 1

Static Protected Member Functions inherited from FGJSBBase
static std::string	CreateIndexedPropertyName (const std::string &Property, int index)

Static Protected Attributes inherited from FGStandardAtmosphere
static constexpr double	EarthRadius = 6356766.0 / fttom
	Earth radius in ft as defined for ISA 1976.

static constexpr double	a = 611.2/psftopa
	Sonntag constants based on ref [2].

static constexpr double	b = 17.62

static constexpr double	c = 243.12

static constexpr double	Mwater = 18.016 * kgtoslug / 1000.0
	Mean molecular weight for water - slug/mol.

static constexpr double	Rdry = Rstar / Mair

static constexpr double	Rwater = Rstar / Mwater

Static Protected Attributes inherited from FGAtmosphere
static constexpr double	SutherlandConstant = 198.72

static constexpr double	Beta = 2.269690E-08

static constexpr double	Rstar = 8.31432 * kgtoslug / KelvinToRankine(fttom * fttom)
	Universal gas constant - ft*lbf/R/mol.

static constexpr double	Mair = 28.9645 * kgtoslug / 1000.0
	Mean molecular weight for air - slug/mol.

static constexpr double	g0 = 9.80665 / fttom
	Sea-level acceleration of gravity - ft/s^2.

static constexpr double	Reng0 = Rstar / Mair
	Specific gas constant for air - ft*lbf/slug/R.

Static Protected Attributes inherited from FGJSBBase
static constexpr double	radtodeg = 180. / M_PI

static constexpr double	degtorad = M_PI / 180.

static constexpr double	hptoftlbssec = 550.0

static constexpr double	psftoinhg = 0.014138

static constexpr double	psftopa = 47.88

static constexpr double	fttom = 0.3048

static constexpr double	ktstofps = 1852./(3600*fttom)

static constexpr double	fpstokts = 1.0 / ktstofps

static constexpr double	inchtoft = 1.0/12.0

static constexpr double	m3toft3 = 1.0/(fttomfttomfttom)

static constexpr double	in3tom3 = inchtoftinchtoftinchtoft/m3toft3

static constexpr double	inhgtopa = 3386.38

static constexpr double	slugtolb = 32.174049
	Note that definition of lbtoslug by the inverse of slugtolb and not to a different constant you can also get from some tables will make lbtoslug*slugtolb == 1 up to the magnitude of roundoff.

static constexpr double	lbtoslug = 1.0/slugtolb

static constexpr double	kgtolb = 2.20462

static constexpr double	kgtoslug = 0.06852168

static const std::string	needed_cfg_version = "2.0"

static const std::string	JSBSim_version = JSBSIM_VERSION " " __DATE__ " " __TIME__

Constructor & Destructor Documentation

◆ FGMSIS()

FGMSIS ( FGFDMExec * fdmex )

Constructor.

Definition at line 74 of file FGMSIS.cpp.

                               : FGStandardAtmosphere(fdmex)
{
  Name = "MSIS";
 
  for(unsigned int i=0; i<24; ++i)
    flags.switches[i] = 1;
  input.year = 0;  // Ignored by NRLMSIS
  input.f107A = 150.;
  input.f107 = 150.;
  input.ap = 4.;
  input.ap_a = nullptr;
 
  Debug(0);
}

◆ ~FGMSIS()

~FGMSIS ( )

Destructor.

Definition at line 91 of file FGMSIS.cpp.

{
  Debug(1);
}

Member Function Documentation

◆ Calculate()

void Calculate ( double altitude )

overrideprotectedvirtual

Calculate the atmosphere for the given altitude.

Reimplemented from FGAtmosphere.

Definition at line 125 of file FGMSIS.cpp.

{
  double SLRair = 0.0;
 
  Compute(0.0, SLpressure, SLtemperature, SLdensity, SLRair);
  Compute(altitude, Pressure, Temperature, Density, Reng);
 
  SLsoundspeed  = sqrt(SHRatio*SLRair*SLtemperature);
  Soundspeed  = sqrt(SHRatio*Reng*Temperature);
  PressureAltitude = CalculatePressureAltitude(Pressure, altitude);
  DensityAltitude = CalculateDensityAltitude(Density, altitude);
 
  Viscosity = Beta * pow(Temperature, 1.5) / (SutherlandConstant + Temperature);
  KinematicViscosity = Viscosity / Density;
  // SaturatedVaporPressure = CalculateVaporPressure(Temperature);
  // ValidateVaporMassFraction(altitude);
}

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◆ Compute()

void Compute	(	double	altitude,
		double &	pression,
		double &	temperature,
		double &	density,
		double &	Rair
	)		const

protected

Definition at line 145 of file FGMSIS.cpp.

{
  constexpr double fttokm = fttom / 1000.;
  constexpr double kgm3_to_slugft3 = kgtoslug / m3toft3;
  constexpr double gtoslug = kgtoslug / 1000.;
  // Molecular weight (g/mol)
  // N2 O2 O He H Ar N OA
  const double species_mmol[8] {28.0134, 31.9988, 31.9988/2.0, 4.0, 1.0, 39.948,
                                28.0134/2.0, 31.9988/2.0};
 
  double dn[10] {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
  double h = altitude*fttokm;
  double lat = in.GeodLatitudeDeg;
  double lon = in.LongitudeDeg;
 
  // Compute epoch
  double utc_seconds = seconds_in_day + FDMExec->GetSimTime();
  unsigned int days = utc_seconds / 86400.;
  utc_seconds -= days * 86400.;
  double today = day_of_year + days;
  unsigned int year = today / 365.;
  today -= year * 365.;
 
  struct nrlmsise_output output;
 
  input.doy = today;
  input.sec = utc_seconds;
  input.alt = h;
  input.g_lat = lat;
  input.g_long = lon;
  input.lst = utc_seconds/3600 + lon/15;  // Local Solar Time (hours)
  assert(flags.switches[9] != -1);        // Make sure that input.ap is used.
 
  gtd7(&input, &flags, &output);
 
  temperature = KelvinToRankine(output.t[1]);
  density = output.d[5] * kgm3_to_slugft3;
  dn[1] = output.d[2];  // N2
  dn[2] = output.d[3];  // O2
  dn[3] = output.d[1];  // O
  dn[4] = output.d[0];  // He
  dn[5] = output.d[6];  // H
  dn[6] = output.d[4];  // Ar
  dn[7] = output.d[7];  // N
  // SUBROUTINE GTD7 does NOT include anomalous oxygen so we drop it from
  // the molar mass computation as well for consistency.
  dn[8] = 0.0;          // OA
 
  // Compute specific gas constant for air
  double mmol = 0.0;
  double qty_mol = 0.0;
 
  for (unsigned int i=1; i<9; ++i) {
    mmol += dn[i]*species_mmol[i-1];
    qty_mol += dn[i];
  }
  double mair = mmol * gtoslug / qty_mol;
  Rair = Rstar / mair;
 
  pressure = density * Rair * temperature;
}

◆ GetDensity() [1/3]

double GetDensity ( double altitude ) const

virtual

Returns the density in slugs/ft^3 at a given altitude in ft.

Reimplemented from FGAtmosphere.

Definition at line 170 of file FGAtmosphere.cpp.

{
  return GetPressure(altitude)/(Reng * GetTemperature(altitude));
}

◆ GetDensity() [2/3]

double GetDensity ( double altitude ) const

inlineoverridevirtual

Returns the density in slugs/ft^3 at a given altitude in ft.

Reimplemented from FGAtmosphere.

Definition at line 117 of file FGMSIS.h.

                                                    {
    double t, p, rho, R;
    Compute(altitude, p, t, rho, R);
    return rho;
  }

◆ GetDensity() [3/3]

virtual double GetDensity ( void ) const

inlinevirtual

Returns the density in slugs/ft^3.

This function may only be used if Run() is called first.

Reimplemented from FGAtmosphere.

Definition at line 167 of file FGAtmosphere.h.

167{return Density;}

◆ GetPressure() [1/3]

double GetPressure ( double altitude ) const

inlineoverridevirtual

Returns the pressure at a specified altitude in psf.

Implements FGAtmosphere.

Definition at line 110 of file FGMSIS.h.

                                                     {
    double t, p, rho, R;
    Compute(altitude, p, t, rho, R);
    return p;
  }

◆ GetPressure() [2/3]

virtual double GetPressure ( double altitude ) const

virtual

Returns the pressure at a specified altitude in psf.

Implements FGAtmosphere.

◆ GetPressure() [3/3]

virtual double GetPressure ( void ) const

inlinevirtual

Returns the pressure in psf.

Reimplemented from FGAtmosphere.

Definition at line 144 of file FGAtmosphere.h.

144{return Pressure;}

◆ GetSoundSpeed() [1/3]

double GetSoundSpeed ( double altitude ) const

virtual

Returns the speed of sound in ft/sec at a given altitude in ft.

Reimplemented from FGAtmosphere.

Definition at line 186 of file FGAtmosphere.cpp.

{
  return sqrt(SHRatio * Reng * GetTemperature(altitude));
}

◆ GetSoundSpeed() [2/3]

double GetSoundSpeed ( double altitude ) const

inlineoverridevirtual

Returns the speed of sound in ft/sec at a given altitude in ft.

Reimplemented from FGAtmosphere.

Definition at line 124 of file FGMSIS.h.

                                                       {
    double t, p, rho, R;
    Compute(altitude, p, t, rho, R);
    return sqrt(FGAtmosphere::SHRatio*R*t);
  }

◆ GetSoundSpeed() [3/3]

virtual double GetSoundSpeed ( void ) const

inlinevirtual

Returns the speed of sound in ft/sec.

Reimplemented from FGAtmosphere.

Definition at line 183 of file FGAtmosphere.h.

183{return Soundspeed;}

◆ GetTemperature() [1/3]

virtual double GetTemperature ( ) const

inlinevirtual

Returns the actual, modeled temperature at the current altitude in degrees Rankine.

Returns: Modeled temperature in degrees Rankine.

Reimplemented from FGAtmosphere.

Definition at line 109 of file FGAtmosphere.h.

109{return Temperature;}

◆ GetTemperature() [2/3]

double GetTemperature ( double altitude ) const

inlineoverridevirtual

Returns the actual modeled temperature in degrees Rankine at a specified altitude.

Parameters

altitude The altitude above sea level (ASL) in feet.

Returns: Modeled temperature in degrees Rankine at the specified altitude.

Implements FGAtmosphere.

Definition at line 103 of file FGMSIS.h.

                                                        {
    double t, p, rho, R;
    Compute(altitude, p, t, rho, R);
    return t;
  }

◆ GetTemperature() [3/3]

virtual double GetTemperature ( double altitude ) const

virtual

Returns the actual modeled temperature in degrees Rankine at a specified altitude.

Parameters

altitude The altitude above sea level (ASL) in feet.

Returns: Modeled temperature in degrees Rankine at the specified altitude.

Implements FGAtmosphere.

◆ InitModel()

bool InitModel ( void )

overridevirtual

Runs the MSIS-00 atmosphere model; called by the Executive Can pass in a value indicating if the executive is directing the simulation to Hold.

Parameters

Holding if true, the executive has been directed to hold the sim from advancing time. Some models may ignore this flag, such as the Input model, which may need to be active to listen on a socket for the "Resume" command to be given.

Returns: false if no error

Reimplemented from FGAtmosphere.

Definition at line 98 of file FGMSIS.cpp.

{
  FGStandardAtmosphere::InitModel();
 
  Calculate(0.0);
 
  return true;
}

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◆ Load()

bool Load ( Element * el )

overridevirtual

Reimplemented from FGModel.

Definition at line 109 of file FGMSIS.cpp.

{
  if (!Upload(el, true)) return false;
 
  if (el->FindElement("day"))
    day_of_year = el->FindElementValueAsNumber("day");
  if (el->FindElement("utc"))
    seconds_in_day = el->FindElementValueAsNumber("utc");
 
  Debug(3);
 
  return true;
}

Member Data Documentation

◆ day_of_year

double day_of_year = 1.0

protected

Definition at line 135 of file FGMSIS.h.

◆ flags

struct nrlmsise_flags flags

protected

Definition at line 138 of file FGMSIS.h.

◆ input

struct nrlmsise_input input

protected

Definition at line 139 of file FGMSIS.h.

◆ seconds_in_day

double seconds_in_day = 0.0

protected

Definition at line 136 of file FGMSIS.h.

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

Detailed Description

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ FGMSIS()

◆ ~FGMSIS()

Member Function Documentation

◆ Calculate()

◆ Compute()

◆ GetDensity() [1/3]

◆ GetDensity() [2/3]

◆ GetDensity() [3/3]

◆ GetPressure() [1/3]

◆ GetPressure() [2/3]

◆ GetPressure() [3/3]

◆ GetSoundSpeed() [1/3]

◆ GetSoundSpeed() [2/3]

◆ GetSoundSpeed() [3/3]

◆ GetTemperature() [1/3]

◆ GetTemperature() [2/3]

◆ GetTemperature() [3/3]

◆ InitModel()

◆ Load()

Member Data Documentation

◆ day_of_year

◆ flags

◆ input

◆ seconds_in_day