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In recent years, the decay-less regime of standing transverse oscillations incoronal loops has been the topic of many observational and numerical studies,focusing on their physical characteristics, as well as their importance forcoronal seismology and wave heating. However, no definitive answer has yet beengiven on the driving mechanism behind these oscillations, with most studiesfocusing on the use of periodic footpoint drivers as a means to excite them. Inthis paper, our goal is to explore the concept of these standing waves beingself-sustained oscillations, driven by a constant background flow. To that end,we use the PLUTO code, to perform $3$D magnetohydrodynamic simulations of agravitationally stratified straight flux tube in a coronal environment, in thepresence of a weak flow around the loop, perpendicular to its axis. Once thisflow is firmly set up, a transverse oscillation is initiated, dominated by thefundamental kink mode of a standing wave, while the existence of a secondharmonic is revealed, with a frequency ratio to the fundamental mode near theobserved ones in decay-less oscillations. The presence of vortex shedding isalso established in our simulations, which is connected to the "slippery"interaction between the oscillator and its surrounding plasma. We thus presenta proof-of-concept of a self-oscillation in a coronal loop, and we propose itas a mechanism that could interpret the observed decay-less transverseoscillations of coronal loops.

Generating transverse loop oscillations through a steady-flow driver