public static GasCell InitGasCell1(double t, double x)
{
var answ = new GasCell(gc);
answ.ro = 40;
answ.u = 0;
answ.p = 4e5;
answ.X = x;
answ.V = 0;
return(answ);
}
/// <summary>
/// Согласно AUSMp.f90
/// </summary>
/// <param name="nodeL"></param>
/// <param name="nodeR"></param>
/// <param name="vbi"></param>
/// <returns>flux</returns>
public static WBVec AUSMp(GasCell nodeL, GasCell nodeR, double vbi)
{
double r1 = nodeL.ro;
double u1 = nodeL.u;
double e1 = nodeL.e;
double r2 = nodeR.ro;
double u2 = nodeR.u;
double e2 = nodeR.e;
double p1 = nodeL.p;
double p2 = nodeR.p;
double H1 = nodeL.H;
double H2 = nodeR.H;
double c1 = nodeL.CSound;
double c2 = nodeR.CSound;
double cs = 0.5 * (c1 + c2);
double Mr1 = (u1 - vbi) / cs;
double Mr2 = (u2 - vbi) / cs;
double du = u2 - u1;
double M4p = Abs(Mr1) >= 1d
? 0.5 * (Mr1 + Abs(Mr1))
: 0.25 * ((Mr1 + 1.0) * (Mr1 + 1.0)) * (1.0 + 2.0 * 0.25 * (Mr1 - 1.0) * (Mr1 - 1.0));
double P5p = Abs(Mr1) >= 1d
? 0.5 * (Mr1 + Abs(Mr1)) / Mr1
: 0.25 * ((Mr1 + 1.0) * (Mr1 + 1.0)) * ((2.0 - Mr1) + 3.0 * Mr1 * 0.25 * (Mr1 - 1.0) * (Mr1 - 1.0));
double M4m = Abs(Mr2) >= 1d
? 0.5 * (Mr2 - Abs(Mr2))
: -0.25 * ((Mr2 - 1.0) * (Mr2 - 1.0)) * (1.0 + 2.0 * 0.25 * (Mr2 + 1.0) * (Mr2 + 1.0));
double P5m = Abs(Mr2) >= 1d
? 0.5 * (Mr2 - Abs(Mr2)) / Mr2
: 0.25 * ((Mr2 - 1.0) * (Mr2 - 1.0)) * ((2.0 + Mr2) - 3.0 * Mr2 * 0.25 * (Mr2 + 1.0) * (Mr2 + 1.0));
double Mrf = M4p + M4m;
double pf = P5p * p1 + P5m * p2;
double flux1 = 0.5 * (cs * Mrf * (r1 + r2) - cs * Abs(Mrf) * (r2 - r1));
double flux2 = 0.5 * (cs * Mrf * (r1 * u1 + r2 * u2) - cs * Abs(Mrf) * (r2 * u2 - r1 * u1)) + pf;
double flux3 = 0.5 * (cs * Mrf * (r1 * H1 + r2 * H2) - cs * Abs(Mrf) * (r2 * H2 - r1 * H1)) + pf * vbi;
return(new WBVec(flux1, flux2, flux3));
}
public static GasCell InitGasCell(double t, double x)
{
var answ = new GasCell(gc);
if (x <= 0d)
{
answ.ro = 1;
answ.u = 0;
answ.p = 1;
}
else
{
answ.ro = 0.125;
answ.u = 0;
answ.p = 0.1;
}
answ.X = x;
answ.V = 0;
return(answ);
}