Understanding the sub-critical transition to turbulence in wall flows
arXiv:0811.2929 · doi:10.1007/s12043-008-0105-1
Abstract
Contrasting with free shear flows presenting velocity profiles with inflection points which cascade to turbulence in a relatively mild way, wall bounded flows are deprived of (inertial) instability modes at low Reynolds numbers and become turbulent in a much wilder way, most often marked by the coexistence of laminar and turbulent domains at intermediate Reynolds numbers, well below the range where (viscous) instabilities can show up. There can even be no unstable mode at all, as for plane Couette flow (pCf) or for Poiseuille pipe flow (Ppf) that currently are the subject of intense research. Though the mechanisms involved in the transition to turbulence in wall flows are now better understood, statistical properties of the transition itself are yet unsatisfactorily assessed. A review of the situation is given. An alternative to the temporal theory of the transition to turbulence in terms of chaotic transients in such globally subcritical flows is proposed, which invokes spatio-temporal intermittence and the theory of first order (thermodynamic) phase transitions.
15 pages, 7 figures; proceedings of the Conference and Workshop on Perspectives in Nonlinear Dynamics, Trieste, 2007
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Cited by in corpus (5)
- Transient Turbulence in Taylor-Couette Flow
- Spatiotemporal perspective on the decay of turbulence in wall-bounded flows
- Extended localized structures and the onset of turbulence in channel flow
- Energy dynamics in a simulation of LAPD turbulence
- Nonlinear instability in simulations of Large Plasma Device turbulence