mirror of
https://github.com/deater/dos33fsprogs.git
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54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
#include <stdio.h>
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#include <math.h>
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int main(int argc, char **argv) {
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double v0=0;
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double g=9.8;
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double mass=700;
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double coeff=0.5;
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double area=3.0*1000.0;
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double density=0.1;
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double time=0.0;
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double a=0.0;
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double altitude=20000.0;
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double deltat=1.0;
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double pressure,pressure0=101325.0;
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double temperature=273.0;
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double v_dir;
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double ga,da;
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double terminal_velocity;
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#define KERBIN_RADIUS 600000.0
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while(1) {
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terminal_velocity=sqrt( (2*mass*g)/(density*area*coeff));
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if (v0>0) v_dir=-1; else v_dir=1;
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ga=-g;
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da=v_dir*(1.0/(2.0*mass))*coeff*density*area*v0*v0;
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a=ga+da;
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// v0=v0+(a*deltat);
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v0=-terminal_velocity;
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altitude=altitude+(v0*deltat);
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time+=deltat;
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pressure=pressure0*exp(-(altitude)/5600);
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density=pressure/(287*temperature);
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g=9.8/(
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((altitude+KERBIN_RADIUS)/KERBIN_RADIUS)*
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((altitude+KERBIN_RADIUS)/KERBIN_RADIUS));
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printf("t=%lf ga=%lf da=%lf a=%lf v=%lf y=%lf tv=%lf\n",time,ga,da,a,v0,altitude,
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terminal_velocity);
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if ((altitude<0) || (altitude>21000)) break;
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}
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return 0;
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}
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