Abstract
| Language | English |
|---|---|
| Pages | 563–572 |
| Number of pages | 10 |
| Journal | Comptes Rendus Mécanique |
| Volume | 339 |
| DOIs | |
| Publication status | Published - 2011 |
Fingerprint
Keywords
- computational fluid mechanics
- fluid mechanics
- thermal convection
- transitions
Cite this
}
Some considerations about the symmetry and evolution of chaotic Rayleigh–Bénard convection : the flywheel mechanism and the “wind” of turbulence. / Lappa, Marcello.
In: Comptes Rendus Mécanique , Vol. 339, 2011, p. 563–572.Research output: Contribution to journal › Article
TY - JOUR
T1 - Some considerations about the symmetry and evolution of chaotic Rayleigh–Bénard convection
T2 - Comptes Rendus Mécanique
AU - Lappa, Marcello
PY - 2011
Y1 - 2011
N2 - Rayleigh-Bénard convection in finite-size enclosures exhibits really intricate features when turbulent states are reached and thermal plumes play a crucial role in a number of them. This complex mechanism may be regarded as a “machine” containing many different working parts: boundary layers, mixing zones, jets, and a relatively free and isothermal central region. These parts are generally regarded as the constitutive “ingredients” whose interplay leads to the emergence of a macroscopic pattern with well-defined properties. Like the Lorenz model (but with the due differences) such a complex structure has a prevailing two-dimensional nature and can be oriented clockwise or anticlockwise (both configurations are equally likely to occur and the flow can exhibit occasional and irregular "reversals" from one to the other without a change in magnitude). It is usually referred to in the literature as "wind of turbulence” or “flywheel”. The present article provides insights into the possible origin of such dynamics and related patterning behavior (supported by “ad hoc” novel numerical simulations carried out for Pr=15 and O(10^3)<=Ra<=O(10^10)) together with a short exposition of existing theories, also illustrating open points and future directions of research.
AB - Rayleigh-Bénard convection in finite-size enclosures exhibits really intricate features when turbulent states are reached and thermal plumes play a crucial role in a number of them. This complex mechanism may be regarded as a “machine” containing many different working parts: boundary layers, mixing zones, jets, and a relatively free and isothermal central region. These parts are generally regarded as the constitutive “ingredients” whose interplay leads to the emergence of a macroscopic pattern with well-defined properties. Like the Lorenz model (but with the due differences) such a complex structure has a prevailing two-dimensional nature and can be oriented clockwise or anticlockwise (both configurations are equally likely to occur and the flow can exhibit occasional and irregular "reversals" from one to the other without a change in magnitude). It is usually referred to in the literature as "wind of turbulence” or “flywheel”. The present article provides insights into the possible origin of such dynamics and related patterning behavior (supported by “ad hoc” novel numerical simulations carried out for Pr=15 and O(10^3)<=Ra<=O(10^10)) together with a short exposition of existing theories, also illustrating open points and future directions of research.
KW - computational fluid mechanics
KW - fluid mechanics
KW - thermal convection
KW - transitions
U2 - 10.1016/j.crme.2011.05.002
DO - 10.1016/j.crme.2011.05.002
M3 - Article
VL - 339
SP - 563
EP - 572
JO - Comptes Rendus Mécanique
JF - Comptes Rendus Mécanique
SN - 1631-0721
ER -