6 papers
Large-scale streak instabilities of transitional channel flow
Nicola Ciola, Yohann Duguet, Jean-Christophe Robinet +2
The emergence of large-scale spatial modulations of turbulent channel flow, as the Reynolds number is decreased, is addressed numerically using the framework of linear stability an…
From annular cavity to rotor-stator flow: nonlinear dynamics of axisymmetric rolls
Artur Gesla, Patrick Le Quéré, Yohann Duguet +1
Spatio-temporally complex flows are found at the onset of unsteadiness in (axisymmetric) rotor-stator turbulence in the shape of concentric rolls. The emergence of these rolls is r…
Computation and stability analysis of periodic orbits using finite differences, Fourier or Chebyshev spectral expansions in time
Artur Gesla, Yohann Duguet, Patrick Le Quéré +1
We analyse and compare several algorithms to compute numerically periodic solutions of high-dimensional dynamical systems and investigate their Floquet stability without building t…
The route to turbulence in magnetohydrodynamic square duct flow
Mattias Brynjell-Rahkola, Yohann Duguet, Thomas Boeck
The transition route from laminar to turbulent flow in a magnetohydrodynamic (MHD) duct with a square cross-section is investigated in the limit of low magnetic Reynolds number. In…
On the origin of circular rolls in rotor-stator flow
Artur Gesla, Yohann Duguet, Patrick Le Quéré +1
Rotor-stator flows are known to exhibit instabilities in the form of circular and spiral rolls. While the spirals are known to emanate from a supercritical Hopf bifurcation, the or…
Subcritical axisymmetric solutions in rotor-stator flow
Artur Gesla, Yohann Duguet, Patrick Le Quéré +1
Rotor-stator cavity flows are known to exhibit unsteady flow structures in the form of circular and spiral rolls. While the origin of the spirals is well understood, that of the ci…