private void MultiplyByScalar()
{
float[] a = new[]
{
1f,
0f,
0.01f,
2f,
10f,
0.1f,
1234f,
678.234f,
};
const float b = 50f;
float[] r = new[]
{
50f,
0f,
0.5f,
100f,
500f,
5f,
61700f,
33911.7f,
};
Span <float> s = stackalloc float[r.Length];
NumericsHelpers.Multiply(a, b, s);
EqualsApprox(r, s);
}
public float GetHeatCapacity(GasMixture mixture)
{
Span <float> tmp = stackalloc float[mixture.Moles.Length];
NumericsHelpers.Multiply(mixture.Moles, GasSpecificHeats, tmp);
return(MathF.Max(NumericsHelpers.HorizontalAdd(tmp), Atmospherics.MinimumHeatCapacity));
}
private float GetHeatCapacityCalculation(float[] moles, bool immutable)
{
// Little hack to make space gas mixtures have heat capacity, therefore allowing them to cool down rooms.
if (immutable && MathHelper.CloseTo(NumericsHelpers.HorizontalAdd(moles), 0f))
{
return(Atmospherics.SpaceHeatCapacity);
}
Span <float> tmp = stackalloc float[moles.Length];
NumericsHelpers.Multiply(moles, GasSpecificHeats, tmp);
return(MathF.Max(NumericsHelpers.HorizontalAdd(tmp), Atmospherics.MinimumHeatCapacity));
}
/// <summary>
/// Divides a source gas mixture into several recipient mixtures, scaled by their relative volumes. Does not
/// modify the source gas mixture. Used for pipe network splitting. Note that the total destination volume
/// may be larger or smaller than the source mixture.
/// </summary>
public void DivideInto(GasMixture source, List <GasMixture> receivers)
{
var totalVolume = 0f;
foreach (var receiver in receivers)
{
if (!receiver.Immutable)
{
totalVolume += receiver.Volume;
}
}
float?sourceHeatCapacity = null;
var buffer = new float[Atmospherics.AdjustedNumberOfGases];
foreach (var receiver in receivers)
{
if (receiver.Immutable)
{
continue;
}
var fraction = receiver.Volume / totalVolume;
// Set temperature, if necessary.
if (MathF.Abs(receiver.Temperature - source.Temperature) > Atmospherics.MinimumTemperatureDeltaToConsider)
{
// Often this divides a pipe net into new and completely empty pipe nets
if (receiver.TotalMoles == 0)
{
receiver.Temperature = source.Temperature;
}
else
{
sourceHeatCapacity ??= GetHeatCapacity(source);
var receiverHeatCapacity = GetHeatCapacity(receiver);
var combinedHeatCapacity = receiverHeatCapacity + sourceHeatCapacity.Value * fraction;
if (combinedHeatCapacity > 0f)
{
receiver.Temperature = (GetThermalEnergy(source, sourceHeatCapacity.Value * fraction) + GetThermalEnergy(receiver, receiverHeatCapacity)) / combinedHeatCapacity;
}
}
}
// transfer moles
NumericsHelpers.Multiply(source.Moles, fraction, buffer);
NumericsHelpers.Add(receiver.Moles, buffer);
}
}
private void Multiply()
{
float[] a = new[]
{
1f,
0f,
1f,
2f,
10f,
0.1f,
1234f,
678.234f,
};
float[] b = new[]
{
1f,
0f,
0f,
2f,
10f,
1f,
4321f,
567.123f,
};
float[] r = new[]
{
1f,
0f,
0f,
4f,
100f,
0.1f,
5332114f,
384642.101f,
};
Span <float> s = stackalloc float[r.Length];
NumericsHelpers.Multiply(a, b, s);
EqualsApprox(r, s);
}