JFM/DAMTP/LIFD/UKFN webinar

SPEAKER:
Laurette Tuckerman

TALK TITLE:
Turbulent-laminar patterns

ABSTRACT:
Experiments and numerical simulations have shown that turbulence in
transitional wall-bounded shear flows such as plane Couette and Poiseuille flow
frequently takes the form of long oblique bands, if the domains are sufficiently
large to accommodate them. At their upper Reynolds-number threshold,
laminar regions carve out gaps in otherwise uniform turbulence, thereby forming
regular oblique turbulent-laminar patterns with a large spatial wavelength.
At the lower threshold, isolated turbulent bands sparsely populate otherwise
laminar domains and complete laminarization takes place via their disappearance
characterized by the 2D directed percolation scenario.

SPEAKER BIO:
Laurette Tuckerman is a senior researcher at PMMH (Physique et
Mecanique des Milieux Heterogenes), an institute affiliated with the
CNRS (Centre National de la Recherche Scientifique), ESPCI and
Sorbonne University.  Prior to this, she was at the University of
Texas at Austin and she obtained her bachelors and PhD degrees from
Princeton and MIT.  She studies hydrodynamic instabilities (such as
those in Couette flows, thermal convection, and Faraday waves) using
the methods of computational fluid dynamics and of bifurcation theory.
She also studies the laminar-turbulent patterns which occur
during transition to turbulence in wall-bounded shear flows.
She is a Fellow of the American Physical Society and of Euromech.