Periodic orbits in large eddy simulation of box turbulence
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 (2014 Fluid Dyn. Res. 46 061413), 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.
- Publication:
-
Fluid Dynamics Research
- Pub Date:
- February 2019
- DOI:
- 10.1088/1873-7005/aac7ec
- arXiv:
- arXiv:1802.00845
- Bibcode:
- 2019FlDyR..51a1411V
- Keywords:
-
- large eddy simulation;
- unstable periodic orbit;
- box turbulence;
- Physics - Fluid Dynamics;
- 76F05;
- 76F20
- E-Print:
- doi:10.1088/1873-7005/aac7ec