Cascades of temperature and entropy fluctuations in three-dimensional compressible turbulence
ORAL
Abstract
Cascades of temperature and entropy fluctuations are studied by numerical simulations of stationary three-dimensional compressible turbulence. The -5/3 scaling behavior is identified for the fluctuation spectra of temperature and entropy, with the Obukhov-Corrsin constants close to that of a passive scalar spectrum. The average subgrid-scale (SGS) fluxes of temperature and entropy normalized by the total dissipation rates are close to 1 in the inertial range. The average SGS fluxes conditioned on the filtered velocity divergence exhibit the scale-invariant property in the inertial range. Moreover, strong compression motions enhance the direct SGS fluxes of temperature and entropy from large scales to small scales.
*This work was supported by NSFC Grant Nos. 11702127, 91752201, and 11672123; the Thousand Talents Plan for Young Professionals; Grant No. JCYJ20170412151759222; Grant No. 2016QNRC001.
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Presenters
Jianchun Wang
Southern University of Science and Technology, China
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
Authors
Jianchun Wang
Southern University of Science and Technology, China
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
Minping Wan
Department of Mechanics and Aerospace Engineering Southern University of Science and Technology
Department of Mechanics and Aerospace Engineering Southern University of Science and Technology, Shenzhen 518055, China
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
Song Chen
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
Chenyue Xie
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
Lian-Ping Wang
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
Shiyi Chen
Department of Mechanics and Aerospace Engineering Southern University of Science and Technology, State Key Laboratory for Turbulence and Complex Systems and Center for Applie
Department of Mechanics and Aerospace Engineering Southern University of Science and Technology, Shenzhen 518055, China, State Key Laboratory for Turbulence and Complex Syste
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China, State Key Laboratory of Turbulence and Complex
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China, State Key Laboratory of Turbulence
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China, State Key Laboratory for Turbulence and Comple
