The evolution of flow structures and energy exchange in forced rotating stratified turbulence

ORAL

Abstract

We investigate the long-time evolution of the rotating stratified turbulence, concerning the flow structures and the exchange between kinetic and potential energy eKtoP. Numerical simulations of forced three-dimensional homogeneous rotating stratified turbulence are performed at a high hyperviscous Reynolds number and low Rossby number for a sequence of Froude numbers. In the presence of stratification, with two box scale structures with opposite signs of vertical vorticity formed at later times, there are short and small vortices spreading over the flow field. Compared with anticyclonic vortices, cyclonic vortices are lack in number, easier to grow up or merge, and form the box-scale structure earlier. Moreover, the intense area of eKtoP is associated with the cyclonic structures. We also find a relation between vertical vorticity and the distribution of the density during the evolution of turbulence, which is serviceable for modeling density by velocity.

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Presenters

  • Tianyi Li

    State Key Laboratory for Turbulence and Complex Systems and Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing, 100871, P. R. China

Authors

  • Tianyi Li

    State Key Laboratory for Turbulence and Complex Systems and Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing, 100871, 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

  • 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