Abstract

Nonlinear relaxation oscillations of flow-shear induced transport barriers can be qualitatively reproduced using a phenomenological critical-gradient model [Leconte et al., Contrib. Plasma Phys. 56, 736 (2016)]. Here, we perform a more in-depth analysis of the mechanism of these nonlinear oscillations, associated with nonlinear phase synchronization, in an extended version of the model including random fluctuations.

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