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ksp: c: more drag

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This commit is contained in:
Vince Weaver 2016-06-02 00:59:28 -04:00
parent 944859e1df
commit 1004701ad5
1 changed files with 42 additions and 10 deletions
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52
ksp/c/ksp_launch.c
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@ -64,6 +64,18 @@ static void draw_ship(int stage, int thrusting, int rotation) {
"\033[12;39H/_\\");
if (thrusting) printf("\033[13;39H\\|/");
}
if (rotation==8) {
printf(
"\033[1;40;37m"
"\033[7;42H_"
"\033[8;41H/\\o\\"
"\033[9;40H/ R\\|"
"\033[10;39H/ /"
"\033[11;38H_\\ /"
"\033[12;38H/\\/\\/"
"\033[13;39H--"
);
}
if (rotation==16) {
printf("\033[1;40;37m");
if (thrusting) {
@ -163,6 +175,15 @@ _______________
\/|/\ |
-- |
---------------|
_______________
_ |
/\o\ |
/ R\| |
/ / |
_\ / |
/\/\/ |
-- |
---------------|
#endif
@ -237,6 +258,7 @@ int main(int argc, char **argv) {
double density=0; /* kg/m^3 */
double temperature=273; /* K */
double drag=0.0,drag_a=0.0;
double drag_angle,drag_x,drag_y,drag_a_x,drag_a_y;
int orbit_map_view=0,current_quadrant=0;
@ -406,17 +428,25 @@ int main(int argc, char **argv) {
/* d=1.05 for cube (wikipedia) */
/* d=0.8 for long cylinder */
/* d=0.5 for long cone */
drag_angle=atan(rocket_velocity_x/rocket_velocity_y);
if (rocket_velocity_y<0) drag_angle+=PI;
if (parachutes_deployed) {
drag=0.5*density*rocket_velocity_y*rocket_velocity_y*1.5*1000.0*parachutes;
drag_x=0.5*density*rocket_velocity_x*rocket_velocity_x*1.5*1000.0*parachutes;
drag_y=0.5*density*rocket_velocity_y*rocket_velocity_y*1.5*1000.0*parachutes;
/* sqrt ((2*m*g)/(rho*A*C)) */
terminal_velocity=sqrt( (2*total_mass[stage]*1000.0*-gravity)/(density*(4+500.0*parachutes)*1.5));
}
else {
drag=0.5*density*rocket_velocity_y*rocket_velocity_y*0.5*4.0;
drag_x=0.5*density*rocket_velocity_x*rocket_velocity_x*0.5*4.0;
drag_y=0.5*density*rocket_velocity_y*rocket_velocity_y*0.5*4.0;
terminal_velocity=sqrt( (2*total_mass[stage]*1000.0*-gravity)/(density*4.0*0.5));
}
drag_a=drag/(total_mass[stage]*1000.0);
if (rocket_velocity_y>0) drag_a=-drag_a;
drag_a_x=drag_x/(total_mass[stage]*1000.0);
drag_a_y=drag_y/(total_mass[stage]*1000.0);
if (rocket_velocity_y>0) drag_a_y=-drag_a_y;
if (rocket_velocity_x>0) drag_a_x=-drag_a_x;
@ -440,7 +470,8 @@ int main(int argc, char **argv) {
(rocket_acceleration_y>0)) {
rocket_acceleration_y+=gravity_y;
rocket_acceleration_x+=gravity_x;
rocket_acceleration_y+=drag_a;
rocket_acceleration_x+=drag_a_x;
rocket_acceleration_y+=drag_a_y;
/* v=v0+at */
rocket_velocity_y=v0_y+rocket_acceleration_y*deltat;
@ -454,7 +485,7 @@ int main(int argc, char **argv) {
// }
else {
rocket_velocity_y=-terminal_velocity;
rocket_velocity_x=0;
//rocket_velocity_x=0;
}
rocket_velocity=vector_magnitude(rocket_velocity_x,rocket_velocity_y);
@ -495,11 +526,12 @@ after_physics:
/* 5032 */
htabvtab(1,21);
printf("Time: %lfs\tStage: %d\t\t%s\n",time,3-stage,"Zurgtroyd");
printf("ALT: %lf km\tAngle=%lf\n",(rocket_altitude-KERBIN_RADIUS)/1000.0,
printf("Time: %.1lfs\tStage: %d\t\t%s\n",time,3-stage,"Zurgtroyd");
printf("ALT: %lf km\tAngle=%.1lf\n",(rocket_altitude-KERBIN_RADIUS)/1000.0,
angle*(180.0/PI));
printf("VEL: %lf m/s\tFuel: %lf%%\n",
rocket_velocity,
printf("VEL: %.0lf m/s (%.0lfx %.0lfy %.0lftv)\tFuel: %.1lf%%\n",
rocket_velocity,rocket_velocity_x,rocket_velocity_y,
terminal_velocity,
fuel_left);
#if 0