46 lines
1.5 KiB
C#
46 lines
1.5 KiB
C#
using System;
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using FluidSim.Components;
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namespace FluidSim.Core
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{
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public static class NozzleFlow
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{
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public static void Compute(Volume0D vol, double area, double downstreamPressure,
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out double massFlow, out double rhoFace, out double uFace, out double pFace,
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double gamma = 1.4)
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{
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// Default fallback (no flow)
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massFlow = 0.0;
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rhoFace = 0.0;
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uFace = 0.0;
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pFace = 0.0;
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if (vol == null || vol.Mass <= 0 || vol.Volume <= 0)
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return;
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double p0 = vol.Pressure;
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double T0 = vol.Temperature;
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double R = vol.GasConstant;
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double rho0 = vol.Density;
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if (double.IsNaN(p0) || double.IsNaN(T0) || double.IsNaN(rho0) ||
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p0 <= 0 || T0 <= 0 || rho0 <= 0)
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return;
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double pr = downstreamPressure / p0;
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double choked = Math.Pow(2.0 / (gamma + 1.0), gamma / (gamma - 1.0));
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if (pr < choked) pr = choked;
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double M = Math.Sqrt((2.0 / (gamma - 1.0)) * (Math.Pow(pr, -(gamma - 1.0) / gamma) - 1.0));
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if (double.IsNaN(M)) return;
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uFace = M * Math.Sqrt(gamma * R * T0);
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rhoFace = rho0 * Math.Pow(pr, 1.0 / gamma);
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pFace = p0 * pr;
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massFlow = rhoFace * uFace * area;
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if (double.IsNaN(massFlow) || double.IsInfinity(massFlow))
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massFlow = 0.0;
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}
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}
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} |