grillkol/FluidSim
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Helmholtz test, sod shock tube

Browse Source
This commit is contained in:
max
2026-05-03 20:33:30 +02:00
parent 7dfc8fa2d2
commit ff4c4aef23
6 changed files with 503 additions and 133 deletions
Download Patch File Download Diff File Expand all files Collapse all files

78
Core/Solver.cs
View File

@@ -1,4 +1,5 @@
using System.Collections.Generic;
using System;
using System.Collections.Generic;
using FluidSim.Components;
using FluidSim.Interfaces;
@@ -10,93 +11,90 @@ namespace FluidSim.Core
private readonly List<Pipe1D> _pipes = new();
private readonly List<Connection> _connections = new();
private double _dt; // global time step
private double _dt;
public void AddVolume(Volume0D v) => _volumes.Add(v);
public void AddPipe(Pipe1D p) => _pipes.Add(p);
public void AddConnection(Connection c) => _connections.Add(c);
/// <summary>Set the global time step (called from Simulation).</summary>
public void SetTimeStep(double dt) => _dt = dt;
/// <summary>
/// Convenient method to set the boundary type of a pipe end.
/// Set boundary type for a pipe end. isA = true for port A (left), false for port B (right).
/// </summary>
public void SetPipeBoundary(Pipe1D pipe, bool isLeft, BoundaryType type, double ambientPressure = 101325.0)
public void SetPipeBoundary(Pipe1D pipe, bool isA, BoundaryType type, double ambientPressure = 101325.0)
{
if (isLeft)
if (isA)
{
pipe.SetLeftBoundaryType(type);
pipe.SetABoundaryType(type);
if (type == BoundaryType.OpenEnd)
pipe.SetLeftAmbientPressure(ambientPressure);
pipe.SetAAmbientPressure(ambientPressure);
}
else
{
pipe.SetRightBoundaryType(type);
pipe.SetBBoundaryType(type);
if (type == BoundaryType.OpenEnd)
pipe.SetRightAmbientPressure(ambientPressure);
pipe.SetBAmbientPressure(ambientPressure);
}
}
public float Step()
{
// 1. Volumes publish state to ports (only needed if any volume exists)
// 1. Volumes publish state
foreach (var v in _volumes)
v.PushStateToPort();
// 2. Set initial pipe boundary conditions ONLY for volume‑coupled ends
// 2. Set volume BCs for volume‑coupled ends
foreach (var conn in _connections)
{
if (IsPipePort(conn.PortA) && IsVolumePort(conn.PortB))
{
var pipe = GetPipe(conn.PortA);
bool isLeft = pipe.PortA == conn.PortA;
BoundaryType bc = isLeft ? pipe.LeftBCType : pipe.RightBCType;
if (bc == BoundaryType.VolumeCoupling)
bool isA = pipe.PortA == conn.PortA;
if ((isA && pipe.ABCType == BoundaryType.VolumeCoupling) ||
(!isA && pipe.BBCType == BoundaryType.VolumeCoupling))
SetVolumeBC(conn.PortA, conn.PortB);
}
else if (IsVolumePort(conn.PortA) && IsPipePort(conn.PortB))
{
var pipe = GetPipe(conn.PortB);
bool isLeft = pipe.PortB == conn.PortB;
BoundaryType bc = isLeft ? pipe.LeftBCType : pipe.RightBCType;
if (bc == BoundaryType.VolumeCoupling)
bool isA = pipe.PortB == conn.PortB;
if ((isA && pipe.ABCType == BoundaryType.VolumeCoupling) ||
(!isA && pipe.BBCType == BoundaryType.VolumeCoupling))
SetVolumeBC(conn.PortB, conn.PortA);
}
}
// 3. Determine number of sub‑steps
// 3. Sub‑steps
int nSub = 1;
foreach (var p in _pipes)
nSub = Math.Max(nSub, p.GetRequiredSubSteps(_dt));
double dtSub = _dt / nSub;
// 4. Sub‑step loop
for (int sub = 0; sub < nSub; sub++)
{
foreach (var p in _pipes)
p.SimulateSingleStep(dtSub);
// Transfer flows only for volume‑coupled connections
foreach (var conn in _connections)
{
if (IsPipePort(conn.PortA) && IsVolumePort(conn.PortB))
{
var pipe = GetPipe(conn.PortA);
bool isLeft = pipe.PortA == conn.PortA;
if (pipe.LeftBCType == BoundaryType.VolumeCoupling || pipe.RightBCType == BoundaryType.VolumeCoupling)
bool isA = pipe.PortA == conn.PortA;
if ((isA && pipe.ABCType == BoundaryType.VolumeCoupling) ||
(!isA && pipe.BBCType == BoundaryType.VolumeCoupling))
TransferAndIntegrate(conn.PortA, conn.PortB, dtSub);
}
else if (IsVolumePort(conn.PortA) && IsPipePort(conn.PortB))
{
var pipe = GetPipe(conn.PortB);
bool isLeft = pipe.PortB == conn.PortB;
if (pipe.LeftBCType == BoundaryType.VolumeCoupling || pipe.RightBCType == BoundaryType.VolumeCoupling)
bool isA = pipe.PortB == conn.PortB;
if ((isA && pipe.ABCType == BoundaryType.VolumeCoupling) ||
(!isA && pipe.BBCType == BoundaryType.VolumeCoupling))
TransferAndIntegrate(conn.PortB, conn.PortA, dtSub);
}
}
// Update BCs for volume‑coupled ends between sub‑steps
if (sub < nSub - 1)
{
foreach (var v in _volumes)
@@ -107,24 +105,24 @@ namespace FluidSim.Core
if (IsPipePort(conn.PortA) && IsVolumePort(conn.PortB))
{
var pipe = GetPipe(conn.PortA);
bool isLeft = pipe.PortA == conn.PortA;
if ((isLeft && pipe.LeftBCType == BoundaryType.VolumeCoupling) ||
(!isLeft && pipe.RightBCType == BoundaryType.VolumeCoupling))
bool isA = pipe.PortA == conn.PortA;
if ((isA && pipe.ABCType == BoundaryType.VolumeCoupling) ||
(!isA && pipe.BBCType == BoundaryType.VolumeCoupling))
SetVolumeBC(conn.PortA, conn.PortB);
}
else if (IsVolumePort(conn.PortA) && IsPipePort(conn.PortB))
{
var pipe = GetPipe(conn.PortB);
bool isLeft = pipe.PortB == conn.PortB;
if ((isLeft && pipe.LeftBCType == BoundaryType.VolumeCoupling) ||
(!isLeft && pipe.RightBCType == BoundaryType.VolumeCoupling))
bool isA = pipe.PortB == conn.PortB;
if ((isA && pipe.ABCType == BoundaryType.VolumeCoupling) ||
(!isA && pipe.BBCType == BoundaryType.VolumeCoupling))
SetVolumeBC(conn.PortB, conn.PortA);
}
}
}
}
// 5. Audio samples from SoundConnections (if any)
// 5. Audio samples (none for now, but placeholder)
var audioSamples = new List<float>();
foreach (var conn in _connections)
{
@@ -132,7 +130,7 @@ namespace FluidSim.Core
audioSamples.Add(sc.GetAudioSample());
}
// 6. Clear volume BC flags
// 6. Clear BC flags
foreach (var p in _pipes)
p.ClearBC();
@@ -148,11 +146,11 @@ namespace FluidSim.Core
{
var pipe = GetPipe(pipePort);
if (pipe == null) return;
bool isLeft = pipe.PortA == pipePort;
if (isLeft)
pipe.SetLeftVolumeState(volPort.Density, volPort.Pressure);
bool isA = pipe.PortA == pipePort;
if (isA)
pipe.SetAVolumeState(volPort.Density, volPort.Pressure);
else
pipe.SetRightVolumeState(volPort.Density, volPort.Pressure);
pipe.SetBVolumeState(volPort.Density, volPort.Pressure);
}
private void TransferAndIntegrate(Port pipePort, Port volPort, double dtSub)
@@ -164,7 +162,7 @@ namespace FluidSim.Core
{
volPort.SpecificEnthalpy = pipePort.SpecificEnthalpy;
}
// else: volume’s own enthalpy (set by PushStateToPort) is used
// else volume’s own enthalpy (from PushStateToPort) is used
GetVolume(volPort)?.Integrate(dtSub);
}