refactoring (broken right now)

Interfaces/Connection.cs

@@ -1,15 +0,0 @@
-namespace FluidSim.Interfaces
-{
-    /// <summary>Pure data link between two ports, with orifice parameters.</summary>
-    public class Connection
-    {
-        public Port PortA { get; }
-        public Port PortB { get; }
-
-        public double Area { get; set; } = 1e-5;          // effective orifice area (m²)
-        public double DischargeCoefficient { get; set; } = 0.62;
-        public double Gamma { get; set; } = 1.4;
-
-        public Connection(Port a, Port b) => (PortA, PortB) = (a, b);
-    }
-}

Interfaces/IComponent.cs

@@ -0,0 +1,19 @@
+using System.Collections.Generic;
+
+namespace FluidSim.Interfaces
+{
+    /// <summary>
+    /// Minimal interface for all simulation components that have ports.
+    /// </summary>
+    public interface IComponent
+    {
+        /// <summary>All ports exposed by this component.</summary>
+        IReadOnlyList<Port> Ports { get; }
+
+        /// <summary>
+        /// Called once per global time step to update the component's internal state
+        /// using the port flow data accumulated during sub‑steps.
+        /// </summary>
+        void UpdateState(double dt);
+    }
+}

Interfaces/Port.cs

@@ -1,18 +1,28 @@
 namespace FluidSim.Interfaces
 {
+    /// <summary>
+    /// A fluid port that belongs to a component. The solver writes mass flow,
+    /// enthalpy, etc. here, and reads pressure, density, etc.
+    /// </summary>
     public class Port
     {
+        // Set by the solver during coupling resolution
+        public double MassFlowRate;         // kg/s, positive INTO the component that owns this port
+        public double SpecificEnthalpy;     // J/kg, enthalpy of the fluid crossing the port (inflow direction)
+
+        // Set by the owning component after integration to reflect its current state
         public double Pressure;             // Pa
-        public double MassFlowRate;         // kg/s, positive INTO the component
-        public double SpecificEnthalpy;     // J/kg, enthalpy of fluid entering this port
         public double Density;              // kg/m³
         public double Temperature;          // K
 
+        // Link back to owner (optional, but handy for debugging)
+        public object? Owner { get; set; }
+
         public Port()
         {
-            Pressure = 101325.0;
             MassFlowRate = 0.0;
             SpecificEnthalpy = 0.0;
+            Pressure = 101325.0;
             Density = 1.225;
             Temperature = 300.0;
         }

Interfaces/SoundConnection.cs

@@ -1,25 +0,0 @@
-namespace FluidSim.Interfaces
-{
-    /// <summary>
-    /// A Connection that also produces an audio sample from the pressure drop across it.
-    /// </summary>
-    public class SoundConnection : Connection
-    {
-        /// <summary>Gain applied to the normalised pressure difference.</summary>
-        public float Gain { get; set; } = 1.0f;
-
-        /// <summary>Reference pressure used for normalisation (Pa). Default: 1 atm.</summary>
-        public double ReferencePressure { get; set; } = 101325.0;
-
-        public SoundConnection(Port a, Port b) : base(a, b) { }
-
-        /// <summary>
-        /// Returns a normalised audio sample proportional to the pressure difference.
-        /// </summary>
-        public float GetAudioSample()
-        {
-            double dp = PortA.Pressure - PortB.Pressure;
-            return (float)(dp / ReferencePressure) * Gain;
-        }
-    }
-}