When the amplitude of the wave is sufficiently large, mean flow appears and starts the cyclic reversal. This situation is
shown in animation 2.
It can be seen that the direction of the mean flow begins to reverse from the far side,
the bottom, and then spreads to the top, near the wave source; and as a result the whole
flow completes the reversal. However, because there are not enough floaters near the
membrane, the exact motion could not be determined.
This reversal of the mean flow is shown in Figure 5. The horizontal axis is the time.
This is similar to the situation in the real QBO2).
The period of the oscillation is 1 to 2 hours, but
there is no apparent correlation with the experimental parameters.
