Let's see how the grid may affect the results on Taylor number.
The new grid was made with Gambit too, but using four times more cells, with a configuration essentially thought for radial and vertical gradients.

New grid with 50000 cells

This grid refinement allowed to catch the instabilities for a Taylor about 1700, which is near the theoritical value of 1712:


So the lenght of cells seems to influence the apparition of the instabilities.

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