Purpose: Models the atmosphere
Called by: FGSimExec
- ------------- Copyright (C) 1999 Jon S. Berndt (jsb@hal-pc.org) -------------
+ ------------- Copyright (C) 1999 Jon S. Berndt (jon@jsbsim.org) -------------
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
#include "FGAtmosphere.h"
-#include <FGState.h>
-#include <FGFDMExec.h>
+#include "FGState.h"
+#include "FGFDMExec.h"
#include "FGAircraft.h"
#include "FGPropagate.h"
#include "FGInertial.h"
-#include <input_output/FGPropertyManager.h>
+#include "input_output/FGPropertyManager.h"
+#include <iostream>
+#include <cstdlib>
+
+using namespace std;
namespace JSBSim {
h = 0.0;
psiw = 0.0;
htab[0]=0;
- htab[1]=36089.239;
- htab[2]=65616.798;
- htab[3]=104986.878;
- htab[4]=154199.475;
- htab[5]=170603.675;
- htab[6]=200131.234;
- htab[7]=259186.352; //ft.
+ htab[1]= 36089.0;
+ htab[2]= 65617.0;
+ htab[3]=104987.0;
+ htab[4]=154199.0;
+ htab[5]=167322.0;
+ htab[6]=232940.0;
+ htab[7]=278385.0; //ft.
MagnitudedAccelDt = MagnitudeAccel = Magnitude = 0.0;
- SetTurbType( ttCulp );
- TurbGain = 0.0;
- TurbRate = 1.7;
+// SetTurbType( ttCulp );
+ SetTurbType( ttNone );
+ TurbGain = 1.0;
+ TurbRate = 10.0;
Rhythmicity = 0.1;
spike = target_time = strength = 0.0;
wind_from_clockwise = 0.0;
+ SutherlandConstant = 198.72; // deg Rankine
+ Beta = 2.269690E-08; // slug/(sec ft R^0.5)
T_dev_sl = T_dev = delta_T = 0.0;
StandardTempOnly = false;
if (FGModel::Run()) return true;
if (FDMExec->Holding()) return false;
+ RunPreFunctions();
+
T_dev = 0.0;
- h = Propagate->Geth();
+ h = Propagate->GetAltitudeASL();
if (!useExternal) {
Calculate(h);
CalculateDerived();
}
+ RunPostFunctions();
+
Debug(2);
return false;
}
}
switch(i) {
- case 1: // 36089 ft.
+ case 0: // Sea level
+ slope = -0.00356616; // R/ft.
+ reftemp = 518.67; // in degrees Rankine, 288.15 Kelvin
+ refpress = 2116.22; // psf
+ //refdens = 0.00237767; // slugs/cubic ft.
+ break;
+ case 1: // 36089 ft. or 11 km
slope = 0;
- reftemp = 389.97;
- refpress = 472.452;
+ reftemp = 389.97; // in degrees Rankine, 216.65 Kelvin
+ refpress = 472.763;
//refdens = 0.000706032;
break;
- case 2: // 65616 ft.
+ case 2: // 65616 ft. or 20 km
slope = 0.00054864;
- reftemp = 389.97;
+ reftemp = 389.97; // in degrees Rankine, 216.65 Kelvin
refpress = 114.636;
//refdens = 0.000171306;
break;
- case 3: // 104986 ft.
- slope = 0.00153619;
- reftemp = 411.57;
- refpress = 8.36364;
+ case 3: // 104986 ft. or 32 km
+ slope = 0.001536192;
+ reftemp = 411.57; // in degrees Rankine, 228.65 Kelvin
+ refpress = 18.128;
//refdens = 1.18422e-05;
break;
- case 4: // 154199 ft.
+ case 4: // 154199 ft. 47 km
slope = 0;
- reftemp = 487.17;
- refpress = 0.334882;
+ reftemp = 487.17; // in degrees Rankine, 270.65 Kelvin
+ refpress = 2.316;
//refdens = 4.00585e-7;
break;
- case 5: // 170603 ft.
- slope = -0.00109728;
- reftemp = 487.17;
- refpress = 0.683084;
+ case 5: // 167322 ft. or 51 km
+ slope = -0.001536192;
+ reftemp = 487.17; // in degrees Rankine, 270.65 Kelvin
+ refpress = 1.398;
//refdens = 8.17102e-7;
break;
- case 6: // 200131 ft.
- slope = -0.00219456;
- reftemp = 454.17;
- refpress = 0.00684986;
+ case 6: // 232940 ft. or 71 km
+ slope = -0.00109728;
+ reftemp = 386.368; // in degrees Rankine, 214.649 Kelvin
+ refpress = 0.0826;
//refdens = 8.77702e-9;
break;
- case 7: // 259186 ft.
+ case 7: // 278385 ft. or 84.8520 km
slope = 0;
- reftemp = 325.17;
- refpress = 0.000122276;
+ reftemp = 336.5; // in degrees Rankine, 186.94 Kelvin
+ refpress = 0.00831;
//refdens = 2.19541e-10;
break;
- case 0:
default: // sea level
slope = -0.00356616; // R/ft.
- reftemp = 518.67; // R
+ reftemp = 518.67; // in degrees Rankine, 288.15 Kelvin
refpress = 2116.22; // psf
//refdens = 0.00237767; // slugs/cubic ft.
break;
intPressure = refpress*pow(intTemperature/reftemp,-Inertial->SLgravity()/(slope*Reng));
intDensity = intPressure/(Reng*intTemperature);
}
-
+
lastIndex=i;
}
T_dev = (*temperature) - GetTemperature(h);
density_altitude = h + T_dev * 66.7;
- if (turbType == ttStandard || ttCulp) Turbulence();
+ if (turbType != ttNone) Turbulence();
vTotalWindNED = vWindNED + vGustNED + vTurbulenceNED;
+ // psiw (Wind heading) is the direction the wind is blowing towards
if (vWindNED(eX) != 0.0) psiw = atan2( vWindNED(eY), vWindNED(eX) );
if (psiw < 0) psiw += 2*M_PI;
soundspeed = sqrt(SHRatio*Reng*(*temperature));
+
+ intViscosity = Beta * pow(intTemperature, 1.5) / (SutherlandConstant + intTemperature);
+ intKinematicViscosity = intViscosity / intDensity;
}
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+//
+// psi is the angle that the wind is blowing *towards*
void FGAtmosphere::SetWindspeed(double speed)
{
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+//
+// psi is the angle that the wind is blowing *towards*
void FGAtmosphere::SetWindPsi(double dir)
{
void FGAtmosphere::Turbulence(void)
{
+ double DeltaT = rate*State->Getdt();
+
switch (turbType) {
case ttStandard: {
- TurbGain = TurbGain * TurbGain * 100.0;
+ // TurbGain = TurbGain * TurbGain * 100.0; // what is this!?
vDirectiondAccelDt(eX) = 1 - 2.0*(double(rand())/double(RAND_MAX));
vDirectiondAccelDt(eY) = 1 - 2.0*(double(rand())/double(RAND_MAX));
// away from the peaks
MagnitudedAccelDt = ((MagnitudedAccelDt - Magnitude) /
(1 + fabs(Magnitude)));
- MagnitudeAccel += MagnitudedAccelDt*rate*TurbRate*State->Getdt();
- Magnitude += MagnitudeAccel*rate*State->Getdt();
+ MagnitudeAccel += MagnitudedAccelDt*TurbRate*DeltaT;
+ Magnitude += MagnitudeAccel*DeltaT;
Magnitude = fabs(Magnitude);
vDirectiondAccelDt.Normalize();
vDirectiondAccelDt(eX) = square_signed(vDirectiondAccelDt(eX));
vDirectiondAccelDt(eY) = square_signed(vDirectiondAccelDt(eY));
- vDirectionAccel += vDirectiondAccelDt*rate*TurbRate*State->Getdt();
+ vDirectionAccel += vDirectiondAccelDt*TurbRate*DeltaT;
vDirectionAccel.Normalize();
- vDirection += vDirectionAccel*rate*State->Getdt();
+ vDirection += vDirectionAccel*DeltaT;
vDirection.Normalize();
}
case ttBerndt: { // This is very experimental and incomplete at the moment.
- TurbGain = TurbGain * TurbGain * 100.0;
-
- vDirectiondAccelDt(eX) = 1 - 2.0*(double(rand())/double(RAND_MAX));
- vDirectiondAccelDt(eY) = 1 - 2.0*(double(rand())/double(RAND_MAX));
- vDirectiondAccelDt(eZ) = 1 - 2.0*(double(rand())/double(RAND_MAX));
-
-
- MagnitudedAccelDt = 1 - 2.0*(double(rand())/double(RAND_MAX)) - Magnitude;
- MagnitudeAccel += MagnitudedAccelDt*rate*State->Getdt();
- Magnitude += MagnitudeAccel*rate*State->Getdt();
+ vDirectiondAccelDt(eX) = GaussianRandomNumber();
+ vDirectiondAccelDt(eY) = GaussianRandomNumber();
+ vDirectiondAccelDt(eZ) = GaussianRandomNumber();
+/*
+ MagnitudedAccelDt = GaussianRandomNumber();
+ MagnitudeAccel += MagnitudedAccelDt * DeltaT;
+ Magnitude += MagnitudeAccel * DeltaT;
+*/
+ Magnitude += GaussianRandomNumber() * DeltaT;
vDirectiondAccelDt.Normalize();
- vDirectionAccel += vDirectiondAccelDt*rate*State->Getdt();
+ vDirectionAccel += TurbRate * vDirectiondAccelDt * DeltaT;
vDirectionAccel.Normalize();
- vDirection += vDirectionAccel*rate*State->Getdt();
+ vDirection += vDirectionAccel*DeltaT;
- // Diminish z-vector within two wingspans
- // of the ground
+ // Diminish z-vector within two wingspans of the ground
double HOverBMAC = Auxiliary->GetHOverBMAC();
- if (HOverBMAC < 2.0)
- vDirection(eZ) *= HOverBMAC / 2.0;
+ if (HOverBMAC < 2.0) vDirection(eZ) *= HOverBMAC / 2.0;
vDirection.Normalize();
vTurbulenceNED = TurbGain*Magnitude * vDirection;
vTurbulenceGrad = TurbGain*MagnitudeAccel * vDirection;
- vBodyTurbGrad = Propagate->GetTl2b()*vTurbulenceGrad;
- vTurbPQR(eP) = vBodyTurbGrad(eY)/Aircraft->GetWingSpan();
+ vBodyTurbGrad = Propagate->GetTl2b() * vTurbulenceGrad;
+ vTurbPQR(eP) = vBodyTurbGrad(eY) / Aircraft->GetWingSpan();
if (Aircraft->GetHTailArm() > 0)
- vTurbPQR(eQ) = vBodyTurbGrad(eZ)/Aircraft->GetHTailArm();
+ vTurbPQR(eQ) = vBodyTurbGrad(eZ) / Aircraft->GetHTailArm();
else
- vTurbPQR(eQ) = vBodyTurbGrad(eZ)/10.0;
+ vTurbPQR(eQ) = vBodyTurbGrad(eZ) / 10.0;
if (Aircraft->GetVTailArm() > 0)
- vTurbPQR(eR) = vBodyTurbGrad(eX)/Aircraft->GetVTailArm();
+ vTurbPQR(eR) = vBodyTurbGrad(eX) / Aircraft->GetVTailArm();
else
vTurbPQR(eR) = vBodyTurbGrad(eX)/10.0;
{
typedef double (FGAtmosphere::*PMF)(int) const;
typedef double (FGAtmosphere::*PMFv)(void) const;
+ typedef int (FGAtmosphere::*PMFt)(void) const;
typedef void (FGAtmosphere::*PMFd)(int,double);
+ typedef void (FGAtmosphere::*PMFi)(int);
PropertyManager->Tie("atmosphere/T-R", this, (PMFv)&FGAtmosphere::GetTemperature);
PropertyManager->Tie("atmosphere/rho-slugs_ft3", this, (PMFv)&FGAtmosphere::GetDensity);
PropertyManager->Tie("atmosphere/P-psf", this, (PMFv)&FGAtmosphere::GetPressure);
PropertyManager->Tie("atmosphere/sigma", this, &FGAtmosphere::GetDensityRatio);
PropertyManager->Tie("atmosphere/delta", this, &FGAtmosphere::GetPressureRatio);
PropertyManager->Tie("atmosphere/a-ratio", this, &FGAtmosphere::GetSoundSpeedRatio);
- PropertyManager->Tie("atmosphere/psiw-rad", this, &FGAtmosphere::GetWindPsi);
+ PropertyManager->Tie("atmosphere/psiw-rad", this, &FGAtmosphere::GetWindPsi, &FGAtmosphere::SetWindPsi);
PropertyManager->Tie("atmosphere/delta-T", this, &FGAtmosphere::GetDeltaT, &FGAtmosphere::SetDeltaT);
PropertyManager->Tie("atmosphere/T-sl-dev-F", this, &FGAtmosphere::GetSLTempDev, &FGAtmosphere::SetSLTempDev);
PropertyManager->Tie("atmosphere/density-altitude", this, &FGAtmosphere::GetDensityAltitude);
(PMFd)&FGAtmosphere::SetWindNED);
PropertyManager->Tie("atmosphere/wind-down-fps", this, eDown, (PMF)&FGAtmosphere::GetWindNED,
(PMFd)&FGAtmosphere::SetWindNED);
- PropertyManager->Tie("atmosphere/wind-from-cw", this, &FGAtmosphere::GetWindFromClockwise,
- &FGAtmosphere::SetWindFromClockwise);
PropertyManager->Tie("atmosphere/wind-mag-fps", this, &FGAtmosphere::GetWindspeed,
&FGAtmosphere::SetWindspeed);
PropertyManager->Tie("atmosphere/total-wind-north-fps", this, eNorth, (PMF)&FGAtmosphere::GetTotalWindNED);
PropertyManager->Tie("atmosphere/gust-down-fps", this, eDown, (PMF)&FGAtmosphere::GetGustNED,
(PMFd)&FGAtmosphere::SetGustNED);
+ PropertyManager->Tie("atmosphere/turb-north-fps", this, eNorth, (PMF)&FGAtmosphere::GetTurbNED,
+ (PMFd)&FGAtmosphere::SetTurbNED);
+ PropertyManager->Tie("atmosphere/turb-east-fps", this, eEast, (PMF)&FGAtmosphere::GetTurbNED,
+ (PMFd)&FGAtmosphere::SetTurbNED);
+ PropertyManager->Tie("atmosphere/turb-down-fps", this, eDown, (PMF)&FGAtmosphere::GetTurbNED,
+ (PMFd)&FGAtmosphere::SetTurbNED);
+
PropertyManager->Tie("atmosphere/p-turb-rad_sec", this,1, (PMF)&FGAtmosphere::GetTurbPQR);
PropertyManager->Tie("atmosphere/q-turb-rad_sec", this,2, (PMF)&FGAtmosphere::GetTurbPQR);
PropertyManager->Tie("atmosphere/r-turb-rad_sec", this,3, (PMF)&FGAtmosphere::GetTurbPQR);
+ PropertyManager->Tie("atmosphere/turb-type", this, (PMFt)&FGAtmosphere::GetTurbType, (PMFi)&FGAtmosphere::SetTurbType);
PropertyManager->Tie("atmosphere/turb-rate", this, &FGAtmosphere::GetTurbRate, &FGAtmosphere::SetTurbRate);
PropertyManager->Tie("atmosphere/turb-gain", this, &FGAtmosphere::GetTurbGain, &FGAtmosphere::SetTurbGain);
PropertyManager->Tie("atmosphere/turb-rhythmicity", this, &FGAtmosphere::GetRhythmicity,
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