Subgrid scale structure of turbulence subject to surface wave straining
ORAL
Abstract
The subgrid-scale (SGS) stresses and energy fluxes of a turbulent flow underneath a surface wave are investigated with direct numerical simulation. The SGS stresses is decomposed into three parts: the wave induced stress, the cross-interaction stress and the turbulent SGS stress. The turbulent SGS stress and other purely turbulence-related statistics are found to be weakly dependent on the wave shape range. Decomposition of the energy flux shows that an eddy-viscosity model is suitable for the turbulent SGS stress but is incapable of modeling the wave induced stress due to its different wavenumber with the wave induced straining. The budget equations for the filtered kinetic energy and the SGS kinetic energy are subdivided through the velocity partition, showing that direct energy transfer between scales only occurs within the same type of motion (wave induced motion or turbulence). The transport terms play an important role in the budget equation for the turbulent SGS kinetic energy.
*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
Kuanyu Chen
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
Kuanyu Chen
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
Lian-ping Wang
Univ of Delaware, Southern University of Science and Technology, China
Univ of Delaware , Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
University of Delaware
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
