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The research was supported by the Okinawa Institute of Science and Technology Graduate University (OIST) with subsidy funding from the Cabinet Office, Government of Japan. This work has been partially done during the 2023 Madrid Turbulence Workshop, organized by Prof. J. Jimenez and made possible by the European Research Council under the Caust grant ERC-AdG-101018287. C.A., G.F.R. and M.E.R. acknowledge the computational resources provided by the Scientific Computing section of the Research Support Division at OIST, on Oakbridge-CX provided by the Information Technology Center (The University of Tokyo) through the HPCI System Research Project (Project ID: hp210246) and on SQUID provided by the Cybermedia Center (Osaka University) through the HPCI System Research Project (Project ID: hp220099). The authors also acknowledge Giovanni Soligo (OIST) for the DNS data. A.C. and S.L.C. acknowledge the grant PID2020-114173RB-I00, TED2021-129774B-C21 and PLEC2022-009235 funded by MCIN/AEI/10.13039/501100011033 and by the European Union "NextGenerationEU"/PRTR, and S.L.C. acknolwedges the support of Comunidad de Madrid through the call Research Grants for Young Investigators from Universidad Politecnica de Madrid.

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Coherent structures in elastic turbulent planar jets

Publicated to:Journal Of Physics: Conference Series. 2753 (1): 012020- - 2024-01-01 2753(1), DOI: 10.1088/1742-6596/2753/1/012020

Authors: Amor, C; Corrochano, A; Rota, GF; Rosti, ME; Le Clainche, S

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Abstract

At low Reynolds numbers, the flow of a Newtonian planar jet remains laminar, thus easy to characterize. In contrast, the presence of elasticity (e.g., attained dissolving polymers in a Newtonian solvent) enables a highly-complex turbulent-like behavior termed elastic turbulence. In this work, we run data-driven modal decomposition algorithms on high-fidelity data collected from the simulation of an elastic turbulent planar jet. The large-scale motions are expressed as a finite expansion of modes that condense the dominant dynamics. The modes associated with lower frequencies weight the most on the reconstruction of the original data, thus they are further decomposed in space to investigate their implications on the sustainment of the elastic turbulent state. Our findings suggest that slower dynamics are crucial for the sustainment of elastic turbulence, which is connected to the interaction of spanwise-coherent structures, steady in space, with spanwise-periodic traveling waves, causing the breakdown of the structures close to the inlet.

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