86 lines
3.2 KiB
C#
86 lines
3.2 KiB
C#
using System;
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using FluidSim.Components;
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using FluidSim.Utils;
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namespace FluidSim.Core
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{
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public static class Simulation
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{
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private static Pipe1D pipe;
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private static Connection leftConn, rightConn; // dummy connections for orifice params
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private static double time;
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private static double dt;
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private static int stepCount;
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public static void Initialize(int sampleRate)
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{
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dt = 1.0 / sampleRate;
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double length = 150 * Units.mm;
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double diameter = 25 * Units.mm;
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double area = Units.AreaFromDiameter(25, Units.mm);
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int nCells = 10;
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pipe = new Pipe1D(length, area, nCells, sampleRate);
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pipe.SetUniformState(1.2, 0.0, 1.0 * Units.atm); // start at 1 atm
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pipe.FrictionFactor = 0.02;
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// Dummy connections – only used for orifice parameters
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leftConn = new Connection(null, null) { Area = area, DischargeCoefficient = 1.0, Gamma = 1.4 };
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rightConn = new Connection(null, null) { Area = area, DischargeCoefficient = 1.0, Gamma = 1.4 };
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}
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public static float Process()
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{
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// Fixed boundary reservoirs
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double pLeft = 1.1 * Units.atm;
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double rhoLeft = 1.2;
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double uLeft = 0.0;
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double pRight = 1.0 * Units.atm;
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double rhoRight = 1.2;
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double uRight = 0.0;
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// Compute boundary fluxes via orifice model
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OrificeBoundary.PipeVolumeFlux(
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pipe.GetLeftPressure(), pipe.GetLeftDensity(), 0.0,
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pLeft, rhoLeft, uLeft,
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leftConn, pipe.Area, true,
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out double leftMassFlux, out double leftMomFlux, out double leftEnergyFlux);
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OrificeBoundary.PipeVolumeFlux(
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pipe.GetRightPressure(), pipe.GetRightDensity(), 0.0,
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pRight, rhoRight, uRight,
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rightConn, pipe.Area, false,
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out double rightMassFlux, out double rightMomFlux, out double rightEnergyFlux);
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pipe.SetLeftBoundaryFlux(leftMassFlux, leftMomFlux, leftEnergyFlux);
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pipe.SetRightBoundaryFlux(rightMassFlux, rightMomFlux, rightEnergyFlux);
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pipe.Simulate();
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time += dt;
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stepCount++;
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Log();
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return 0f;
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}
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public static void Log()
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{
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if (stepCount <= 20 || stepCount % 50 == 0)
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{
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Console.WriteLine($"Step {stepCount:D4} t = {time * 1e3:F3} ms");
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for (int i = 0; i < pipe.GetCellCount(); i++)
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{
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double rho = pipe.GetCellDensity(i);
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double p = pipe.GetCellPressure(i);
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double u = pipe.GetCellVelocity(i);
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Console.WriteLine($" Cell {i}: ρ={rho:F4} kg/m³ p={p / 1e5:F6} bar u={u:F3} m/s");
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}
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double leftFlow = pipe.PortA.MassFlowRate;
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double rightFlow = pipe.PortB.MassFlowRate;
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Console.WriteLine($" Left flow = {leftFlow * 1e3:F4} g/s Right flow = {rightFlow * 1e3:F4} g/s");
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Console.WriteLine();
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}
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}
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}
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} |