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Dr Sotos Generalis

Turbulence, chaos or order? - Their source and role in dynamics
British Science Festival event: Find out about the complicated world of turbulent flow. See how we try to unravel its secrets and what we can learn about its structure from simulations.

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Key publication

Hairpin vortex solution in planar Couette flow: A tapestry of knotted voices, made the front page of the Physical Review Letters, which is the publication of choice to announce the most important findings in high-energy physics from the whole world.
View the press release

Research

Dr Sotos Generalis's research concentrates on the numerical solution of the strongly non-linear Navier-Stokes equations as applied to the stability problems concerning incompressible plane-parallel shear flows.

The non-linear Navier-Stokes equations are solved with the aid of a Galerkin-type technique in order to identify the hierarchical transition to turbulence. The (generalized) case of transition of fluid flow patterns from the laminar stage to the early stages of the turbulent regime in plane parallel shear flows is a major subject in the fluid dynamics research because of its considerable importance to applications in engineering and geophysics.

Theoretical investigations aided by the advance of powerful hardware coupled by parallel experimental studies of plane parallel shear flows have provided significant insights in identifying the transition mechanisms from laminar to turbulent flow. Recent work on the strongly non-linear studies of Couette flow have appeared on the cover issue of the Physical Review Letters.

Dr Generalis has also worked in the application of computational fluid dynamical techniques to a variety of problems in polymer processing, complex reaction mechanisms and reactor design.

Postdoctoral Fellowship enquiries

I welcome enquiries from PhD-qualified researchers from all countries outside the UK that wish to apply for a Marie Curie Fellowship to come and work with me at Aston; the next call opens on 14th March 2013 with a deadline of 14th August 2013. There are two Fellowship Schemes available:

  • One for early- to mid-career researchers of any nationality currently working in Europe (Intra-European fellowship, IEF)
  • One for researchers at mid-career plus working in any country outside of Europe (International Incoming Fellowship, IIF)

Subject areas include transition to turbulence for shear flow, probing the structure of turbulence in shear flows and bifurcation sequences of (coupled) canonical flows. Please contact me directly for further details.

Recent invited talks 

The role of streaks in transition and turbulent shear flows - Imperial College London

Towards Understanding the Structure of Turbulence - Southampton University AFM Series Talk

Recent awards

Project Acronym: T2T-VDG 
Project status: Indicative start date December 2012
Programme type: Seventh Framework Programme 
Subprogramme Area:Marie-Curie Action: "International Incoming Fellowship" 
Contract type:International Incoming Fellowships (IIF) 
Marie-Curie Intra-European Fellow: Dr Takeshi Akinaga.

Project Acronym: T2T-VHF
Project status: Commencing January 2012
Programme type: Seventh Framework Programme
Subprogramme Area:Marie-Curie Action: "Intra-European fellowships for career development"
Contract type:Intra-European Fellowships (IEF)
Marie-Curie Intra-European Fellow: Dr Gregory Cartland Glover.

Leverhulme Trust Research Grant

The intermediate particle flow: multiscale experiments and modelling

with Dr Yassir Makkawi (PI) and Professor Rafaela Ocone (CI)


Royal Academy of Engineering Distinguished Fellowship Scheme

Professor Fujimura, (Tottori University, Japan)

Duration: One month (March 2012)
Prof Fujimura has developed techniques for establishing bifurcating secondary flow, responsible for the momentum and mass transfer in the channel of fluid flow, that are powerful devices applicable in the vicinity of the stability boundary of the laminar shear flow.
This technique will be combined with the fully non-linear programmes that exist at the involved.host Institution. This will create a new generation of programmes that will in turn incubate graduates to become engineers that have intimate knowledge of the mechanisms.

The Leverhulme Trust Visiting Professorship

Professor Friederich Busse

VP1-2012–017 (Period: 2013 - 2014)

The main aim of this proposal is to understand the structure of turbulence in shear fluid flow. Professor Busse is a world leading authority in the field and will closely interact with the Dr Generalis and the wider Aston Mathematics Department in order to unravel the structure of turbulence, offering the possibility for widespread practical engineering benefits. An additional aim is to bring together two authorities in their field - Professor Busse (fluid dynamics) and from Aston Electronic Enginering Department Professor Turitsyn (photonics) - and through mutual interaction and drawing from fluid dynamical analogies adapt, enhance and extend existing theoretical approaches and numerical tools to the problem of optical wave turbulence.

View the press release >>

View video of Prof Friedrich Busse's lecture on Turbulence >>



Selected publications


T. Itano, S. Generalis, T. Akinaga & M.Sugihara-Seki, Transition of Planar Couette Flow at infinite Reynoldsnumbers, American Physical Society, Physical Review Letters v111, (2013) 184502.

T. Itano, S. Generalis, T. Akinaga & M.Sugihara-Seki, http://arxiv.org/abs/1306.2702 (2013).

S.C. Generalis and T. Itano, 2010. Characterization of the hairpin vortex solution in plane Couette flow, Physical Review E, volume 82, 066308.


Symmetry of coherent Vortices in Plane Couette Flow, September 2009
By T. Itano, S. Generalis, S.Toh, J. Fletcher, European Turbulence Conference, Springer Verlag.

Range of validity of weakly nonlinear theory in the Rayleigh-Benard problem,

By Sotos Constantinou Generalis and Kaoru Fujimura, Journal of the Physical Society of Japan
Volume 78, no8, August 2009, 084401

Transition in Inclined Internally Heated Fluid Layers, 2008
By SC Generalis and FH Busse
Eurotherm 74, H.C.de Lange and A.A.Steenhoven, editors, FCV10

Pattern competition in homogeneously heated fluid layers,
By Gregory Cartland Glover and Sotos Constantinou Generalis, Engineering Applications of Computational Fluid Mechanics
Volume 3, No. 2, pp. 164–174, March 2009.

Generalis, S. & CartlandGlover, G. 2008, ”Homogeneously Heated Shear Flows”, Eurotherm 74, H.C.de Lange and A.A.Steenhoven, editors, FCV5.

Generalis, S. C., Cartland Glover, G. M. (2005). Modelling a biochemical reaction with computational fluid dynamics, International Journal of Chemical Reactor Engineering, Vol. 3: A50

Cartland Glover, G. M., Generalis, S. C., (2004). The modelling of buoyancy driven flow in bubble columns, Chemical Engineering and Processing 43(2), 101-115.

Cartland Glover, G. M., Generalis, S. C., (2004). Gas–liquid–solid flow modelling in a bubble column, Chemical Engineering and Processing 43(2), 117-126.

Blazej, M.(a), Cartland Glover, G.M.(b), Generalis, S.C.(b), & Markos, J.(a)*.  "Gas-Liquid Simulation of an Airlift Bubble Column Reactor". (a) Slovak Technical University, Slovak Republic. (b) Aston University, UK.  Chemical Engineering & Processing, 43, 2004, 137-144. {rated (number 20) in the list of Top 25 Papers published in this journal}

Nagata, M (a) & Generalis, S (b).  "Transition in Homogeneously Heated Inclined Plane Parallel Shear Flows". (a) Kyoto University, Japan. (b) Aston University, UK. Journal of Heat Transfer, 125, 795-803.

Nagata, M (a) & Generalis, S (b).  "Transition in Plane Parallel Shear Flows Heated Internally".  (a) Kyoto University, Japan. (b) Aston University, UK.  C. R. Mecanique, 332, 2004, 9-16.

Cartland Glover, G.M. & Generalis, S.*.  "Gas-Liquid-Solid Flow Modelling in a bubble Column".  Aston University, UK.  Chemical Engineering & Processing, 43, 2004, 117-126.

Cartland Glover, G. M., Blažej, M., Generalis, S. C., Markoš, J., (2003). Three-dimensional gas-liquid simulation of an airlift bubble column reactor, Chemical Papers, 57, 387-392.

Nagata, M (a) & Generalis, S (b).  "Transition in Convective Flows Heated Internally". (a) Kyoto University, Japan. (b) Aston University, UK.  Journal of Heat Transfer, 124, 2002, 635-642.

Cartland Glover, G. M., Generalis, S. C., Thomas, N. H., (2001). Three-phase flow in bubble columns, Chemical Engineering Technology 73, 753.

Cartland Glover, G. M., Generalis, S. C., Thomas, N. H., (2000). CFD and bubble column reactors: simulation and experiment, Chemical Papers 54, 361.


Employable Graduates; Exploitable Research