Engineering and Materials Research Seminar Series

Localisation and chaos in doubly diffusive convection

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Seminars

As part of the School of Science and Technology's Engineering and Materials Research Seminar Series, Dr Cedric Beaume, University of Leeds presents: Localisation and chaos in doubly diffusive convection.

  • From: Wednesday 5 December 2018, 1 pm
  • To: Wednesday 5 December 2018, 2 pm
  • Location: 015, CELS, Nottingham Trent University, Clifton Campus, Clifton Lane, Nottingham, NG11 8NS

Past event

Event details

As part of the School of Science and Technology's Engineering and Materials Research Seminar Series, Dr Cedric Beaume, University of Leeds presents: Localisation and chaos in doubly diffusive convection.

Doubly diffusive convection in a closed vertically extended 3D container driven by horizontal temperature and concentration gradients is studied. When the buoyancy ratio N=-1, this configuration admits a conduction state where the fluid is stationary and the temperature and concentration fields are linear in space. This state is prone to a subcritical  instability that generates two families of spatially localised rolls known as convectons. Convectons are organised in a pair of intertwined solution branches within a well-defined range of Rayleigh numbers in a behavior known as homoclinic snaking. Secondary instabilities along the snaking are found to yield twisted convectons whose branches describe secondary snaking. The twist instability destabilises the primary convectons and is responsible for the absence of stable steady states, localised or otherwise, in the sub critical regime. As a result, for Rayleigh numbers beyond the threshold for primary instability, the system exhibits an abrupt transition to large amplitude spatio-temporal chaos. The origin of this chaos is traced back to a crisis bifurcation occurring in the vicinity of the primary bifurcation.

This seminar is hosted by Dr Lucas Goehring and Dr Ian Shuttlewoth

All Welcome

For any enquires please contact Dr Ian Shuttleworth

Location details

Room/Building:

015, CELS

Address:

Nottingham Trent University
Clifton Campus
Clifton Lane
Nottingham
NG11 8NS

Past event

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