学術雑誌論文 Regeneration cycle and the covariant Lyapunov vectors in a minimal wall turbulence.

Inubushi, Masanobu  ,  Takehiro, Shin-Ichi  ,  Yamada, Michio

92 ( 2 ) 2015-08-24 , American Physical Society
ISSN:1539-3755
NII書誌ID(NCID):AA11558033
内容記述
Considering a wall turbulence as a chaotic dynamical system, we study regeneration cycles in a minimal wall turbulence from the viewpoint of orbital instability by employing the covariant Lyapunov analysis developed by [F. Ginelli et al. Phys. Rev. Lett. 99, 130601 (2007)PRLTAOPRLTAO0031-900710.1103/PhysRevLett.99.130601]. We divide the regeneration cycle into two phases and characterize them with the local Lyapunov exponents and the covariant Lyapunov vectors of the Navier-Stokes turbulence. In particular, we show numerically that phase (i) is dominated by instabilities related to the sinuous mode and the streamwise vorticity, and there is no instability in phase (ii). Furthermore, we discuss a mechanism of the regeneration cycle, making use of an energy budget analysis.
本文を読む

http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/201954/1/PhysRevE.92.023022.pdf

このアイテムのアクセス数:  回

その他の情報