grillkol/FluidSim
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

tuff

Browse Source
This commit is contained in:
grillkol
2026-05-05 19:39:11 +02:00
parent 608dabff12
commit d6b1d214f5
11 changed files with 493 additions and 277 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
Core/NozzleFlow.cs
View File

@@ -9,7 +9,6 @@ namespace FluidSim.Core
out double massFlow, out double rhoFace, out double uFace, out double pFace,
double gamma = 1.4)
{
// Default fallback (no flow)
massFlow = 0.0;
rhoFace = 0.0;
uFace = 0.0;
@@ -29,16 +28,43 @@ namespace FluidSim.Core
double pr = downstreamPressure / p0;
double choked = Math.Pow(2.0 / (gamma + 1.0), gamma / (gamma - 1.0));
if (pr < choked) pr = choked;
double M = Math.Sqrt((2.0 / (gamma - 1.0)) * (Math.Pow(pr, -(gamma - 1.0) / gamma) - 1.0));
if (double.IsNaN(M)) return;
// If pr > 1, flow is INTO the cylinder (reverse), so we swap the roles.
bool reverse = (pr > 1.0);
if (reverse)
{
// Treat the cylinder as the downstream, the pipe as the upstream.
double p_up = downstreamPressure;
double T_up = 300.0; // pipe temperature (ambient)
double rho_up = downstreamPressure / (R * T_up);
uFace = M * Math.Sqrt(gamma * R * T0);
rhoFace = rho0 * Math.Pow(pr, 1.0 / gamma);
pFace = p0 * pr;
double pr_rev = p0 / p_up; // now cylinder / pipe
if (pr_rev < choked) pr_rev = choked;
double M = Math.Sqrt((2.0 / (gamma - 1.0)) * (Math.Pow(pr_rev, -(gamma - 1.0) / gamma) - 1.0));
if (double.IsNaN(M)) return;
// Flow from pipe INTO cylinder (positive mass flow into volume)
uFace = M * Math.Sqrt(gamma * R * T_up);
rhoFace = rho_up * Math.Pow(pr_rev, 1.0 / gamma);
pFace = p_up * pr_rev;
massFlow = rhoFace * uFace * area;
// massFlow is positive = into cylinder
}
else
{
// Normal flow out of cylinder
if (pr < choked) pr = choked;
double M = Math.Sqrt((2.0 / (gamma - 1.0)) * (Math.Pow(pr, -(gamma - 1.0) / gamma) - 1.0));
if (double.IsNaN(M)) return;
uFace = M * Math.Sqrt(gamma * R * T0);
rhoFace = rho0 * Math.Pow(pr, 1.0 / gamma);
pFace = p0 * pr;
massFlow = -rhoFace * uFace * area; // negative = out of cylinder
}
massFlow = rhoFace * uFace * area;
if (double.IsNaN(massFlow) || double.IsInfinity(massFlow))
massFlow = 0.0;
}