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engine almost working, backup before adding gas types.

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max
2026-05-07 20:07:15 +02:00
parent 14f5ba925f
commit 92d84eacfe
18 changed files with 1236 additions and 587 deletions
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62
Core/OrificeLink.cs
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@@ -13,11 +13,12 @@ namespace FluidSim.Core
public double DischargeCoefficient { get; set; } = 0.62;
public double EffectiveLength { get; set; } = 0.001;
public bool UseInertance { get; set; } = true;
public bool UseInertance { get; set; } = false;
private double _mdot; // positive = volume → pipe
// Current mass flow (kg/s, positive = volume → pipe)
private double _mdot;
public double LastMassFlowRate { get; private set; }
public double LastMassFlowRate { get; private set; } // positive = into volume
public double LastFaceDensity { get; private set; }
public double LastFaceVelocity { get; private set; }
public double LastFacePressure { get; private set; }
@@ -41,10 +42,10 @@ namespace FluidSim.Core
}
// Gather states
double volP = VolumePort.Pressure;
double volP = VolumePort.Pressure;
double volRho = VolumePort.Density;
double volT = VolumePort.Temperature;
double volH = VolumePort.SpecificEnthalpy;
double volT = VolumePort.Temperature;
double volH = VolumePort.SpecificEnthalpy;
(double pipeRho, double pipeU, double pipeP) = IsPipeLeftEnd
? Pipe.GetInteriorStateLeft()
@@ -52,25 +53,34 @@ namespace FluidSim.Core
double pipeT = pipeP / Math.Max(pipeRho * 287.0, 1e-12);
double gamma = 1.4;
double R = 287.0;
double R = 287.0;
// ---- 1. Steady‑state nozzle solution (gives correct exit pressure) ----
double mdotSS;
// ---- Steady‑state nozzle solution (gives correct exit state) ----
double mdotSS; // positive = volume → pipe
double rhoFace0, uFace0, pFace0;
if (volP >= pipeP)
{
IsentropicOrifice.Compute(volP, volRho, volT, pipeP, gamma, R, area, DischargeCoefficient,
out double mdotUpToDown, out rhoFace0, out uFace0, out pFace0);
mdotSS = mdotUpToDown; // volume → pipe
mdotSS = mdotUpToDown;
}
else
{
IsentropicOrifice.Compute(pipeP, pipeRho, pipeT, volP, gamma, R, area, DischargeCoefficient,
out double mdotUpToDown, out rhoFace0, out uFace0, out pFace0);
mdotSS = -mdotUpToDown; // pipe → volume → negative for volume→pipe convention
mdotSS = -mdotUpToDown;
}
// ---- 2. Inertance dynamics ----
// ====== Hard physical cap: max sonic flow × 1.1 ======
double upRho = mdotSS >= 0 ? volRho : pipeRho;
double upT = mdotSS >= 0 ? volT : pipeT;
double upC = Math.Sqrt(gamma * R * upT);
double maxFlow = upRho * upC * area * 1.1;
if (Math.Abs(mdotSS) > maxFlow)
mdotSS = Math.Sign(mdotSS) * maxFlow;
// ====================================================
// ---- Dynamic update ----
if (UseInertance)
{
double rhoUp = _mdot >= 0 ? volRho : pipeRho;
@@ -85,39 +95,39 @@ namespace FluidSim.Core
_mdot = mdotSS;
}
// Clamp outflow to available mass
// Clamp outflow to available mass (if finite volume)
if (VolumePort.Owner is Volume0D vol)
{
double maxOut = vol.Mass / dtSub;
if (_mdot > maxOut) _mdot = maxOut;
}
// ---- 3. Ghost state (use nozzle‑exit pressure!) ----
double rhoFace = _mdot >= 0 ? volRho : pipeRho; // upstream density
double pFace = pFace0; // correct exit pressure (choked/subsonic)
// ---- Ghost state ----
double rhoFace = _mdot >= 0 ? volRho : pipeRho;
double pFace = pFace0;
double mdotMag = Math.Abs(_mdot);
double uFace = mdotMag / (rhoFace * area);
double uFace = mdotMag / (rhoFace * area);
if (IsPipeLeftEnd)
uFace = _mdot >= 0 ? uFace : -uFace; // left: +u into pipe
uFace = _mdot >= 0 ? uFace : -uFace;
else
uFace = _mdot >= 0 ? -uFace : uFace; // right: +u out of pipe
uFace = _mdot >= 0 ? -uFace : uFace;
if (IsPipeLeftEnd)
Pipe.SetGhostLeft(rhoFace, uFace, pFace);
else
Pipe.SetGhostRight(rhoFace, uFace, pFace);
// Store for monitoring
double mdotIntoVolume = -_mdot;
LastMassFlowRate = mdotIntoVolume;
LastFaceDensity = rhoFace;
// Store results (positive = into volume)
LastMassFlowRate = -_mdot;
LastFaceDensity = rhoFace;
LastFaceVelocity = uFace;
LastFacePressure = pFace;
VolumePort.MassFlowRate = mdotIntoVolume;
VolumePort.MassFlowRate = -_mdot;
if (mdotIntoVolume >= 0)
// Enthalpy transport
if (-_mdot >= 0) // inflow → pipe enthalpy
{
double hPipe = gamma / (gamma - 1.0) * pipeP / Math.Max(pipeRho, 1e-12);
VolumePort.SpecificEnthalpy = hPipe;
@@ -140,7 +150,7 @@ namespace FluidSim.Core
Pipe.SetGhostRight(rInt, -uInt, pInt);
LastMassFlowRate = 0.0;
LastFaceDensity = rInt;
LastFaceDensity = rInt;
LastFaceVelocity = 0.0;
LastFacePressure = pInt;
if (VolumePort != null)