1. Periodic orbits in large eddy simulation of box turbulence
- Author
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Alberto Vela-Martín, Tatsuya Yasuda, Genta Kawahara, and Lennaert van Veen
- Subjects
Fluid Flow and Transfer Processes ,Physics ,Turbulence ,Mechanical Engineering ,Fluid Dynamics (physics.flu-dyn) ,FOS: Physical sciences ,General Physics and Astronomy ,Physics - Fluid Dynamics ,Mechanics ,01 natural sciences ,010305 fluids & plasmas ,Physics::Fluid Dynamics ,0103 physical sciences ,Periodic orbits ,010306 general physics ,76F05, 76F20 ,Large eddy simulation - Abstract
We describe and compare two time-periodic flows embedded in Large Eddy Simulation (LES) of turbulence in a three-dimensional, periodic domain subject to constant external forcing. One of these flows models the regeneration of large-scale structures that was observed in this geometry by Yasuda et al. ({\sl Fluid Dyn. Res.} {\bf 46}, 061413, 2014), who used a smaller LES filter length and thus obtained a greater separation of scales of coherent motion. We speculate on the feasibility of modelling the regenerative dynamics with time-periodic solutions in such a flow, which may require novel techniques to deal with the extreme ill-conditioning of the associated boundary value problems.
- Published
- 2019