public BoltzmannGenerator(ParticleContainer cont, double temperature, ParticleInfo info,
int projectedCalls = 10000, int nDivisions = 10000) :
base(cont, projectedCalls, nDivisions)
{
this.temperature = temperature;
mass = info.Mass;
Setup();
}
protected override double GetSpeed(ParticleInfo info)
{
double ran = RandomGen.NextDouble();
double speed = minVal;
double cumulative = 0;
while (cumulative < ran)
{
speed += increment;
cumulative += increment * normalization * Function(speed);
}
return(speed);
}
protected override double GetSpeed(ParticleInfo info)
{
bool returnedValue = false;
double randomSpeed = 0;
while (returnedValue == false)
{
double boltzmannConstant = 1.38 * Math.Pow(10, -23);
// Pick speed between min and max
randomSpeed = RandomGen.NextDouble(min, max);
// Find probability of getting that speed
double probability = 4 * Math.PI * Math.Pow((info.Mass / (2 * Math.PI * boltzmannConstant * temperature)), 1.5);
probability *= randomSpeed * randomSpeed * Math.Pow(Math.E, -(info.Mass * randomSpeed * randomSpeed) / (2 * boltzmannConstant * temperature));
// generate random double between 0,1. If <= probability, use that velocity. If not try again.
double randNum = RandomGen.NextDouble();
if (randNum <= probability)
{
returnedValue = true;
}
}
return(randomSpeed);
}
protected override double GetSpeed(ParticleInfo info)
{
double counter = 0;
double mass = info.Mass;
double temperature = 293.15;
double result = 0;
double velo;
while (counter < 1)
{
velo = RandomGen.NextDouble(minSpeed, maxSpeed);
double equation = BoltzmannFunction(velo, mass, temperature);
double rand = RandomGen.NextDouble();
if (rand < equation)
{
result = velo;
counter++;
}
}
return(result);
}
/// <summary> /// Choose a speed at random for a new particle /// </summary> abstract protected double GetSpeed(ParticleInfo info);
public Particle(Vector position, Vector velocity, ParticleInfo info)
{
Position = position;
Velocity = velocity;
Info = info;
}
override protected double GetSpeed(ParticleInfo info)
{
return(RandomGen.NextDouble(min, max));
}
/// <summary>
/// Create a new particle by name
/// </summary>
/// <param name="name">The name of the particle type to be created, as a string</param>
public Particle MakeParticle(Vector position, Vector velocity, string name)
{
ParticleInfo info = Map[name];
return(new Particle(position, velocity, info));
}
/// <summary>
/// Adds a particle type to the dictionary
/// </summary>
public void AddParticle(ParticleInfo info)
{
Map.Add(info.Name, info);
}