Add project files.

2026-05-02 16:58:40 +02:00
parent edc3fd9b48
commit 9fc45224af
17 changed files with 915 additions and 0 deletions
--- a/Components/Volume0D.cs
+++ b/Components/Volume0D.cs
@@ -0,0 +1,71 @@
+using System;
+using FluidSim.Interfaces;
+using FluidSim.Utils;
+
+namespace FluidSim.Components
+{
+    public class Volume0D
+    {
+        public Port Port { get; private set; }
+
+        public double Mass { get; private set; }
+        public double InternalEnergy { get; private set; }
+
+        public double Gamma { get; set; } = 1.4;
+        public double GasConstant { get; set; } = 287.0;
+
+        public double Volume { get; set; }
+        public double dVdt { get; set; }
+
+        private double _dt;
+
+        public double Density => Mass / Volume;
+        public double Pressure => (Gamma - 1.0) * InternalEnergy / Volume;
+        public double Temperature => Pressure / (Density * GasConstant);
+        public double SpecificEnthalpy => Gamma / (Gamma - 1.0) * Pressure / Density;
+
+        public Volume0D(double initialVolume, double initialPressure,
+                        double initialTemperature, int sampleRate,
+                        double gasConstant = 287.0, double gamma = 1.4)
+        {
+            GasConstant = gasConstant;
+            Gamma = gamma;
+            Volume = initialVolume;
+            dVdt = 0.0;
+            _dt = 1.0 / sampleRate;
+
+            double rho0 = initialPressure / (GasConstant * initialTemperature);
+            Mass = rho0 * Volume;
+            InternalEnergy = (initialPressure * Volume) / (Gamma - 1.0);
+
+            Port = new Port();
+            PushStateToPort();
+        }
+
+        public void PushStateToPort()
+        {
+            Port.Pressure = Pressure;
+            Port.Density = Density;
+            Port.Temperature = Temperature;
+            Port.SpecificEnthalpy = SpecificEnthalpy;
+        }
+
+        public void Integrate()
+        {
+            double mdot = Port.MassFlowRate;
+            double h_in = Port.SpecificEnthalpy;
+
+            double dm = mdot * _dt;
+            double dE = (mdot * h_in) * _dt - Pressure * dVdt * _dt;
+
+            Mass += dm;
+            InternalEnergy += dE;
+
+            // Hard physical bounds – prevent NaN and unphysical states
+            if (Mass < 1e-12) Mass = 1e-12;
+            if (InternalEnergy < 1e-12) InternalEnergy = 1e-12;
+
+            PushStateToPort();
+        }
+    }
+}