Open end working
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@@ -9,40 +9,41 @@ namespace FluidSim.Tests
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public class TestScenario : Scenario
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{
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private Solver solver;
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private Volume0D volume;
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private Pipe1D pipe;
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private Atmosphere atmosphere;
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private OrificeLink orificeLink;
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private OpenEndLink openEndLink;
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private OrificeLink closedEnd; // left end – closed wall
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private OpenEndLink openEndLink; // right end – atmosphere
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private SoundProcessor soundProcessor;
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private OutdoorExhaustReverb reverb;
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private int stepCount;
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private double simTime; // elapsed simulation time (seconds)
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private double pulseInterval = 0.1; // seconds between pulses
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private double nextPulseTime;
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private double dt;
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public override void Initialize(int sampleRate)
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{
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double dt = 1.0 / sampleRate;
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dt = 1.0 / sampleRate;
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soundProcessor = new SoundProcessor(sampleRate, 1);
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soundProcessor.Gain = 10;
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reverb = new OutdoorExhaustReverb(sampleRate);
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solver = new Solver();
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solver.SetTimeStep(dt);
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volume = new Volume0D(1e-3, 150000.0, 300.0);
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solver.AddComponent(volume);
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pipe = new Pipe1D(2.0, 1e-4, 20);
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// Pipe: 2 m long, 1 cm² area, 200 cells
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pipe = new Pipe1D(length: 2, area: 1e-4, cellCount: 100);
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solver.AddComponent(pipe);
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atmosphere = new Atmosphere();
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solver.AddComponent(atmosphere);
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// Initially pipe at ambient conditions
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pipe.SetUniformState(1.225, 0.0, 101325.0);
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// Volume → left pipe end (orifice)
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var volPort = volume.CreatePort();
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orificeLink = new OrificeLink(volPort, pipe, isPipeLeftEnd: true, areaProvider: () => 1e-5)
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{
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DischargeCoefficient = 0.62,
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Gamma = volume.Gamma,
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GasConstant = volume.GasConstant
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};
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solver.AddOrificeLink(orificeLink);
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// Left end: closed wall (area = 0 → reflective)
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closedEnd = new OrificeLink(null, pipe, isPipeLeftEnd: true, areaProvider: () => 0.0);
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solver.AddOrificeLink(closedEnd);
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// Right pipe end → atmosphere (characteristic open‑end)
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// Right end: open to atmosphere
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openEndLink = new OpenEndLink(pipe, isLeftEnd: false)
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{
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AmbientPressure = 101325.0,
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@@ -51,45 +52,82 @@ namespace FluidSim.Tests
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solver.AddOpenEndLink(openEndLink);
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stepCount = 0;
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Console.WriteLine("TestScenario initialized with sampleRate = " + sampleRate);
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simTime = 0.0;
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nextPulseTime = pulseInterval; // first pulse at 100 ms
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Console.WriteLine("Pulse reflection test – closed left, open right");
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Console.WriteLine("Pulse injected every 100 ms at left end (cell 0)");
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}
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public override float Process()
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{
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solver.Step();
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stepCount++;
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simTime += dt;
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if (stepCount % 100 == 0)
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// ---- Inject a pressure pulse at the closed end every 100 ms ----
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if (simTime >= nextPulseTime)
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{
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double volPressure = volume.Pressure;
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double volMass = volume.Mass;
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double pipeLeftPressure = pipe.GetCellPressure(0);
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double pipeRightPressure = pipe.GetCellPressure(pipe.CellCount - 1);
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double mdotOrifice = orificeLink.LastMassFlowRate;
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double mdotOpen = openEndLink.LastMassFlowRate;
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// Apply a Gaussian pulse to the first few cells
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double ambientPressure = 101325.0;
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double pulseAmplitude = 20 * ambientPressure; // 0.5 atm overpressure
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double pulseWidth = 0.05; // m (spread over a few cells)
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int n = pipe.CellCount;
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double dx = 2.0 / n;
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Console.WriteLine($"Step {stepCount}:");
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Console.WriteLine($" Vol Pressure = {volPressure:F1} Pa, Mass = {volMass:E4} kg");
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Console.WriteLine($" Pipe left P = {pipeLeftPressure:F1} Pa, right P = {pipeRightPressure:F1} Pa");
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Console.WriteLine($" Orifice mdot = {mdotOrifice:E4} kg/s, Open‑end mdot = {mdotOpen:E4} kg/s");
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Console.WriteLine();
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// Only modify cells within 2*pulseWidth from the left end
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int maxCell = Math.Min(5, n - 1); // at most the first 5 cells
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for (int i = 0; i <= maxCell; i++)
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{
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double x = (i + 0.5) * dx;
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double P = pulseAmplitude * Math.Exp(-x * x / (pulseWidth * pulseWidth));
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double currentP = pipe.GetCellPressure(i);
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double newP = P;
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// Update pressure, keeping density and velocity unchanged
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// We recompute total energy accordingly
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double rho = pipe.GetCellDensity(i);
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double u = pipe.GetCellVelocity(i);
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double e = newP / ((1.4 - 1.0) * rho);
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double E = rho * e + 0.5 * rho * u * u;
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pipe.SetCellState(i, rho, u, newP);
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}
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Console.WriteLine($"Pulse injected at t = {simTime:F3} s");
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nextPulseTime += pulseInterval;
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}
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// Audio sample from the open‑end mass flow
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return (float)openEndLink.LastMassFlowRate;
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// Audio from open‑end mass flow
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float sample = soundProcessor.Process(openEndLink);
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// Log every 200 steps
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if (stepCount % 1000 == 0)
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{
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int leftIdx = 0;
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int midIdx = pipe.CellCount / 2;
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int rightIdx = pipe.CellCount - 1;
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double pL = pipe.GetCellPressure(leftIdx);
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double pM = pipe.GetCellPressure(midIdx);
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double pR = pipe.GetCellPressure(rightIdx);
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Console.WriteLine($"Step {stepCount}: P_left={pL:F1} Pa, P_mid={pM:F1} Pa, P_right={pR:F1} Pa");
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}
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if (double.IsNaN(pipe.GetCellPressure(0)))
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{
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Console.WriteLine("NaN detected – stopping simulation.");
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return 0f;
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}
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return reverb.Process(sample);
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}
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public override void Draw(RenderWindow target)
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{
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float winWidth = target.GetView().Size.X;
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float winHeight = target.GetView().Size.Y;
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float pipeCenterY = winHeight / 2f;
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float margin = 60f;
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float pipeStartX = margin;
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float pipeEndX = winWidth - margin;
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// Use the shared pipe drawing from the base class
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DrawPipe(target, pipe, pipeCenterY, pipeStartX, pipeEndX);
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}
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}
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