old_contents: from phi.flow import *
  
  domain = Domain([64, 64], boundaries=PERIODIC)
  world.add(BurgersVelocity(domain, velocity=lambda s: math.randfreq(s) * 2), physics=Burgers())
  
  show(App('Burgers Equation in %dD' % len(domain.resolution), framerate=5))
  
new_contents: from phi.flow import *
  
  domain = Domain([64, 64], boundaries=PERIODIC, box=box[0:100, 0:100])
  world.add(BurgersVelocity(domain, velocity=Noise(channels=domain.rank) * 2), physics=Burgers())
  
  show(App('Burgers Equation in %dD' % len(domain.resolution), framerate=5))
  
subject: Use Noise in Burgers demo