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G422_SIM_DYNAMICS.cpp
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230 lines (146 loc) · 7.28 KB
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#include "G422.h"
//
// from stock DG - blame dr. Martin
// ==============================================================
// Airfoil coefficient functions
// Return lift, moment and zero-lift drag coefficients as a
// function of angle of attack (alpha or beta)
// ==============================================================
// 1. vertical lift component (wings and body) | alpha
void VLiftCoeff (VESSEL *v, double aoa, double M, double Re, void *context, double *cl, double *cm, double *cd)
{
int i;
const int nabsc = 9;
static const double AOA[nabsc] = {-180*RAD, -60*RAD, -30*RAD, -2*RAD, 15*RAD, 20*RAD, 25*RAD, 60*RAD, 180*RAD};
for (i = 0; i < nabsc-1 && AOA[i+1] < aoa; i++);
double f = (aoa-AOA[i]) / (AOA[i+1]-AOA[i]);
static const double CL_sbsc[nabsc] = { 0, 0, -0.5, -0.1, 0.8, 0.72, 0.35, 0, 0};
static const double CM_sbsc[nabsc] = { 0, 0, 0.014, 0.0042, -0.006, -0.008, -0.010, .004, 0};
*cl = CL_sbsc[i] + (CL_sbsc[i+1]-CL_sbsc[i]) * f; // aoa-dependent lift coefficient
*cm = CM_sbsc[i] + (CM_sbsc[i+1]-CM_sbsc[i]) * f; // aoa-dependent moment coefficient
double wingPos = (static_cast<G422*>( v ))->wingTipWvrd->pos;
if (wingPos > 0.01)
{
*cl = (*cl) * (wingPos * ( 6.0* (M+2.0) )) * WAVERIDER_FACTOR;
//
}
wingPos = (static_cast<G422*>( v ))->wingTipFthr->pos;
if (wingPos > 0.01)
{
*cl = (*cl) * (1.0 - wingPos * WINGFTHR_LIFTDMP);
}
double saoa = sin(aoa);
double pd = 0.015 + 0.4*saoa*saoa; // profile drag
double wd = oapiGetWaveDrag (M, 0.75, 1.0, 1.1, 0.04);
*cd = pd + oapiGetInducedDrag (*cl, 1.5, 0.7) + wd;
// profile drag + (lift-)induced drag + transonic/supersonic wave (compressibility) drag
// ground effect lift
//
double agl = v->GetAltitude(); // prehaps this could be more precise
//
if (agl < MAXHEIG_GROUNDEFFECT && M > 0.1)
{
double gndFX = 1-((agl) * MAXHINV_GROUNDEFFECT);
*cl += ((gndFX * gndFX * saoa) * MAXLIFT_GROUNDEFFECT);
}
}
// 2. horizontal lift component (vertical stabilisers and body) | beta
void HLiftCoeff (VESSEL *v, double beta, double M, double Re, void *context, double *cl, double *cm, double *cd)
{
int i;
const int nabsc = 8;
static const double BETA[nabsc] = {-180*RAD,-135*RAD,-90*RAD,-45*RAD,45*RAD,90*RAD,135*RAD,180*RAD};
static const double CL[nabsc] = { 0, +0.3, 0, -0.3, +0.3, 0, -0.3, 0};
for (i = 0; i < nabsc-1 && BETA[i+1] < beta; i++);
*cl = CL[i] + (CL[i+1]-CL[i]) * (beta-BETA[i]) / (BETA[i+1]-BETA[i]);
*cm = 0.0;
*cd = 0.015 + oapiGetInducedDrag (*cl, 1.5, 0.6) + oapiGetWaveDrag (M, 0.75, 1.0, 1.1, 0.04);
}
void RAMX_FxModel(VESSEL *vessel, G422::RAMCASTER &ramx)
{
// very much shameless ripoff from DG code... no re-inventing the wheel for us this time....
// -- thanks again, Martin!
const OBJHANDLE hBody = vessel->GetAtmRef();
const ATMCONST *atm = (hBody ? oapiGetPlanetAtmConstants (hBody) : 0);
if (atm) // atmospheric parameters available
{
double M, Fs, T0, Td, Tb, Tb0, Te, p0, pd, D, rho, cp, v0, ve, tr, lvl, dma, dmf, precov, dmafac;
const double eps = 1e-4;
const double dma_scale = 2.7e-4;
M = vessel->GetMachNumber(); // Mach number
T0 = vessel->GetAtmTemperature(); // freestream temperature
p0 = vessel->GetAtmPressure(); // freestream pressure
rho = vessel->GetAtmDensity(); // freestream density
cp = atm->gamma * atm->R / (atm->gamma-1.0); // specific heat (pressure)
v0 = M * sqrt (atm->gamma * atm->R * T0); // freestream velocity
tr = (1.0 + 0.5*(atm->gamma-1.0) * M*M); // temperature ratio
Td = T0 * tr; // diffuser temperature
pd = p0 * pow (Td/T0, atm->gamma/(atm->gamma-1.0)); // diffuser pressure
precov = max (0.0, 1.0-0.075*pow (max(M,1.0)-1.0, 1.35)); // pressure recovery
dmafac = dma_scale*precov*pd;
}
}
FXMapRef fxRef;
#define HEX_2_SCALAR 0.00392156862745098039
double FXMapRedChannel(BMP &tex, double u, double v)
{
u = clamp(0.0, u, 1.0) * 256; v = clamp(0.0, v, 1.0) * 256;
int x = floor(u);
int y = floor(v);
double u_ratio = u - x;
double v_ratio = v - y;
double u_opposite = 1 - u_ratio;
double v_opposite = 1 - v_ratio;
double p00, p10, p01, p11;
p00 = double(tex(x, y)->Red) * HEX_2_SCALAR; p10 = double(tex(x+1, y)->Red) * HEX_2_SCALAR;
p01 = double(tex(x+1,y)->Red) * HEX_2_SCALAR; p11 = double(tex(x+1,y+1)->Red) * HEX_2_SCALAR;
return (p00 * u_opposite + p10 * u_ratio) * v_opposite + (p01 * u_opposite + p11 * u_ratio) * v_ratio;
}
double FXMapGreenChannel(BMP &tex, double u, double v)
{
u = clamp(0.0, u, 1.0) * 256; v = clamp(0.0, v, 1.0) * 256;
int x = floor(u);
int y = floor(v);
double u_ratio = u - x;
double v_ratio = v - y;
double u_opposite = 1 - u_ratio;
double v_opposite = 1 - v_ratio;
double p00, p10, p01, p11;
p00 = double(tex(x, y)->Green) * HEX_2_SCALAR; p10 = double(tex(x+1, y)->Green) * HEX_2_SCALAR;
p01 = double(tex(x+1,y)->Green) * HEX_2_SCALAR; p11 = double(tex(x+1,y+1)->Green) * HEX_2_SCALAR;
return (p00 * u_opposite + p10 * u_ratio) * v_opposite + (p01 * u_opposite + p11 * u_ratio) * v_ratio;
}
double FXMapBlueChannel(BMP &tex, double u, double v)
{
u = clamp(0.0, u, 1.0) * 256; v = clamp(0.0, v, 1.0) * 256;
int x = floor(u);
int y = floor(v);
double u_ratio = u - x;
double v_ratio = v - y;
double u_opposite = 1 - u_ratio;
double v_opposite = 1 - v_ratio;
double p00, p10, p01, p11;
p00 = double(tex(x, y)->Blue) * HEX_2_SCALAR; p10 = double(tex(x+1, y)->Blue) * HEX_2_SCALAR;
p01 = double(tex(x+1,y)->Blue) * HEX_2_SCALAR; p11 = double(tex(x+1,y+1)->Blue) * HEX_2_SCALAR;
return (p00 * u_opposite + p10 * u_ratio) * v_opposite + (p01 * u_opposite + p11 * u_ratio) * v_ratio;
}
void FXMapAll(FXMapRef &fxr, BMP &tex, double u, double v)
{
u = clamp(0.0, u, 1.0) * 256; v = clamp(0.0, v, 1.0) * 256;
int x = floor(u);
int y = floor(v);
double u_ratio = u - x;
double v_ratio = v - y;
double u_opposite = 1 - u_ratio;
double v_opposite = 1 - v_ratio;
double p00, p10, p01, p11;
p00 = double(tex(x, y)->Red) * HEX_2_SCALAR; p10 = double(tex(x+1, y)->Red) * HEX_2_SCALAR;
p01 = double(tex(x+1,y)->Red) * HEX_2_SCALAR; p11 = double(tex(x+1,y+1)->Red) * HEX_2_SCALAR;
fxr.channelRed = (p00 * u_opposite + p10 * u_ratio) * v_opposite + (p01 * u_opposite + p11 * u_ratio) * v_ratio;
p00 = double(tex(x, y)->Green) * HEX_2_SCALAR; p10 = double(tex(x+1, y)->Green) * HEX_2_SCALAR;
p01 = double(tex(x+1,y)->Green) * HEX_2_SCALAR; p11 = double(tex(x+1,y+1)->Green) * HEX_2_SCALAR;
fxr.channelGreen = (p00 * u_opposite + p10 * u_ratio) * v_opposite + (p01 * u_opposite + p11 * u_ratio) * v_ratio;
p00 = double(tex(x, y)->Blue) * HEX_2_SCALAR; p10 = double(tex(x+1, y)->Blue) * HEX_2_SCALAR;
p01 = double(tex(x+1,y)->Blue) * HEX_2_SCALAR; p11 = double(tex(x+1,y+1)->Blue) * HEX_2_SCALAR;
fxr.channelBlue = (p00 * u_opposite + p10 * u_ratio) * v_opposite + (p01 * u_opposite + p11 * u_ratio) * v_ratio;
}