refactoring (broken right now)

Components/Atmosphere.cs

@@ -0,0 +1,43 @@
+using FluidSim.Interfaces;
+
+namespace FluidSim.Components
+{
+    /// <summary>
+    /// Represents the ambient atmosphere – constant pressure/temperature reservoir.
+    /// </summary>
+    public class Atmosphere : IComponent
+    {
+        public double Pressure { get; set; } = 101325.0;
+        public double Temperature { get; set; } = 300.0;
+        public double GasConstant { get; set; } = 287.0;
+        public double Gamma => 1.4;
+
+        public double Density => Pressure / (GasConstant * Temperature);
+        public double SpecificEnthalpy => Gamma / (Gamma - 1.0) * Pressure / Density;
+
+        public Port Port { get; }
+
+        public Atmosphere()
+        {
+            Port = new Port { Owner = this };
+            UpdatePort();
+        }
+
+        public IReadOnlyList<Port> Ports => new[] { Port };
+
+        public void UpdateState(double dt)
+        {
+            // Atmosphere is static – just ensure the port reflects current values
+            UpdatePort();
+        }
+
+        private void UpdatePort()
+        {
+            Port.Pressure = Pressure;
+            Port.Density = Density;
+            Port.Temperature = Temperature;
+            Port.SpecificEnthalpy = SpecificEnthalpy;
+            // MassFlowRate is set by the solver connector
+        }
+    }
+}