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DY: Fachverband Dynamik und Statistische Physik
DY 41: Poster: Nonlinear Dynamics, Granular Matter, and Machine Learning
DY 41.5: Poster
Mittwoch, 11. März 2026, 15:00–18:00, P5
Transition to Turbulence via Synchronization and Interacting Wakes — •Urantuya Batsuuri1,2, Michael Hölling1,2, Matthias Wächter1,2, and Joachim Peinke1,2 — 1School of Mathematics and Science, Institute of Physics, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany — 2ForWind - Center for Wind Energy Research, Küpkersweg 70, 26129 Oldenburg, Germany
The study investigates the dynamics of wake interactions under periodic perturbations using an active grid with two independently driven shafts, which are excited with different frequencies. Downstream velocity field is measured with constant-temperature anemometry to resolve the flow response.
For the single-shaft excitation case, a nonlinear synchronization effect is observed: the wake meandering synchronizes to the small-amplitude shaft motion, and this synchronized behavior grows downstream until it collapses into turbulence. Through this synchronization mechanism, the transition to turbulence appears to be accelerated.
For the two-shaft excitation case, an incipient interaction of the vortices leads to a low-dimensional quasi-periodic state. Further downstream, increasing nonlinear dynamics generate enhanced higher harmonics and interharmonics (mixing components). Eventually, the spectrum broadens into a fully turbulent state that follows the classical -5/3 power-law decay.
Keywords: Nonlinear Interactions; Transition to Turbulence; Wake Dynamics