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This animation if picture with a 0.025s time step show the evolution of the x-velocity. Unfortunately colors may designate different speeds from one picture to another. Notice the growth of a transition zone (in green and yellow) and the spreading of the hot spots that a turning into wide and diffuse zones. It is also interesting to monitor the peek velocity that vary from 1,36 m/s at t=0.05s  to 1.11 m/s at t=0.225s that confirms the global evolution towards small speed gradients after the period where the vortex is rapidly growing.

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