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Statistical analysis of global wind dynamics in vigorous Rayleigh-Bénard convection

Title data

Petschel, Klaus ; Wilczek, Michael ; Breuer, Martin ; Friedrich, Rudolf ; Hansen, Ulrich:
Statistical analysis of global wind dynamics in vigorous Rayleigh-Bénard convection.
In: Physical Review E. Vol. 84 (2011) Issue 2 . - No. 026309.
ISSN 1550-2376
DOI: https://doi.org/10.1103/PhysRevE.84.026309

Abstract in another language

Experimental and numerical studies of thermal convection have shown that sufficiently vigorous convective flows exhibit a large-scale thermal wind component sweeping along small-scale thermal boundary layer instabilities. A characteristic feature of these flows is an intermittent behavior in the form of irregular reversals in the orientation of the large-scale circulation. There have been several attempts toward a better understanding and description of the phenomenon of flow reversals, but so far most of these models are based on a statistical analysis of few-point measurements or on simplified theoretical assumptions. The analysis of long-term data sets (\textgreater5 × 105 turnover times τt \textequals d/urms) obtained by numerical simulations of turbulent two-dimensional Rayleigh-Benard convection allows us to get a more comprehensive view of the spatio-temporal flow behavior. ´ By means of a global statistical analysis of the characteristic spatial modes of the flow we extract information about the stability of dominant large-scale modes as well as the reversal paths in state subspace. We examine probability density functions and drift vector fields of two-dimensional state subspaces spanned by different large-scale spatial modes. This also provides information about the coexistence of dominant modes.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics I > Chair Theoretical Physics I - Univ.-Prof. Dr. Michael Wilczek
Profile Fields > Advanced Fields > Nonlinear Dynamics
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 24 Feb 2022 07:33
Last Modified: 24 Feb 2022 10:41
URI: https://eref.uni-bayreuth.de/id/eprint/67608