Removed unused orifice class

Components/Orifice.cs

@@ -1,73 +0,0 @@
-using System;
-using FluidSim.Interfaces;
-
-namespace FluidSim.Components
-{
-    public class Orifice
-    {
-        public Port PortA { get; }
-        public Port PortB { get; }
-
-        public double Area { get; set; }
-        public double DischargeCoeff { get; set; } = 0.62;
-        public double Gamma { get; set; } = 1.4;
-
-        public Orifice(double area)
-        {
-            Area = area;
-            PortA = new Port();
-            PortB = new Port();
-        }
-
-        public void Simulate()
-        {
-            double pA = PortA.Pressure, pB = PortB.Pressure;
-            double dp = pA - pB;
-            double rho = dp >= 0 ? PortA.Density : PortB.Density;
-            if (rho <= 0) rho = 1.225;
-
-            double massFlow;
-            double absDp = Math.Abs(dp);
-            double critical = 1e-3 * pA;   // blend threshold
-
-            if (absDp < critical)
-            {
-                // Linearised region for numerical stability
-                massFlow = Area * DischargeCoeff * Math.Sqrt(2 * rho * critical) * dp / critical;
-            }
-            else
-            {
-                double sign = Math.Sign(dp);
-                double pratio = Math.Min(pA, pB) / Math.Max(pA, pB);
-                double choked = Math.Pow(2.0 / (Gamma + 1.0), Gamma / (Gamma - 1.0));
-
-                if (pratio < choked)
-                {
-                    double term = Math.Sqrt(Gamma * Math.Pow(2.0 / (Gamma + 1.0), (Gamma + 1.0) / (Gamma - 1.0)));
-                    massFlow = DischargeCoeff * Area * Math.Sqrt(rho * Math.Max(pA, pB)) * term;
-                }
-                else
-                {
-                    double exp = 1.0 - Math.Pow(pratio, (Gamma - 1.0) / Gamma);
-                    massFlow = DischargeCoeff * Area *
-                        Math.Sqrt(2.0 * rho * Math.Max(pA, pB) * (Gamma / (Gamma - 1.0)) * pratio * pratio * exp);
-                }
-                massFlow *= sign;
-            }
-
-            PortA.MassFlowRate = -massFlow;   // outflow from A
-            PortB.MassFlowRate = massFlow;    // inflow to B
-
-            if (massFlow > 0) // A->B
-            {
-                PortA.SpecificEnthalpy = PortA.SpecificEnthalpy;
-                PortB.SpecificEnthalpy = PortA.SpecificEnthalpy;
-            }
-            else
-            {
-                PortA.SpecificEnthalpy = PortB.SpecificEnthalpy;
-                PortB.SpecificEnthalpy = PortB.SpecificEnthalpy;
-            }
-        }
-    }
-}