Development of the spiral structure

 
 
 
 
Image computed for every third unit of time ranging from 0 to 175.
We have suppressed the time independent average vorticity represented by w0 in the fourier coefficients to better visualize the roll-up of the vorticity sheets.
The distortion of the contours for small values of t is due to a lack of sufficient convergence for the truncated Fourier series.
The series is not uniformly convergent and we have chosen to concentrate on values of t larger than 50.

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