2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/122857The question of whether the zero viscosity limit $ν\to 0$ is identical to the no viscosity $ν\equiv 0$ case is investigated in a simple shell (GOY) model with only three shells. We find that it is possible to express two velocities in terms of Bessel functions. The third velocity function acts as a background. The relevant Bessel functions are infinitely oscillating as $ν\to 0$ and do not have a limiting value. Therefore two of the velocity functions of this three-shell model are not analytic functions of $ν$ at the point $ν=0$. We also mention a perturbative method which may be used to improve the model.10 pages. Some formulas have been simplified and clarifying remarks have been addedHigh Energy Physics - TheoryAstrophysicsExactly Solvable and Integrable Systemstext