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hybridoDomain    = scene.get_HY_GridDomain("HY_Domain01")
hybridoEmitter   = scene.get_HY_Emitter("HY_Emitter01")
hybridoParticles = hybridoDomain.getParticles()
emitterSpeed     = hybridoEmitter.getParameter("@ Speed")
numOfParticles   = len(hybridoParticles)
currentVelocity  = 0.0
maxSpeed         = 5.0

# Sum up all velocities
for particle in hybridoParticles:
	currentVelocity += particle.getVelocity().module()

# Calculate average velocity and avoid illegal division by zero:  
if (numOfParticles > 0):
	averageVelocity = currentVelocity / float(numOfParticles)
# Check, if average velocity greater than current emitter speed and smaller than the given speed limit "maxSpeed" 
if (averageVelocity > emitterSpeed and averageVelocity <= maxSpeed):
	hybridoEmitter.setParameter("@ Speed", averageVelocity)