ANR Chair of Excellence TUCOROM (20102015)
ANR Chair of Excellence TUCOROM (20102015) by
Bernd NOACK
The ANR Chair of Excellence
'Closedloop control of turbulent shear flows using reducedorder modelling (TUCOROM)'
has fueled and finally enabled a longterm dream of mine:
a generally applicable method for a feedback control logic for realworld turbulence.
We have termed this method
'Machine Learning Control (MLC)'.
Additional enablers for feedback turbulence control include
Clusterbased ReducedOrder Modelling (CROM)
and progresses on PODbased
ReducedOrder Modelling (ROM)
Exemplary publications include:
 Brunton, S. L. &
Noack, B. R. (2015)
"Closedloop turbulence control: Progress and challenges".
Applied Mechanics Reviews (online).
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 Gautier, N., Aider, J.L., Duriez, T., Noack, B. R.,
Segond, M. & Abel, M. W. (2015)
"Closedloop separation control using machine learning".
Journal of Fluid Mechanics 770, 242441
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 Kaiser, E.
Noack, B.R., Cordier, L., Spohn, A.,
Segond, M., Abel. M., Daviller, G.,
Östh, J., Krajnovic, S., & Niven, R.K. (2014)
"Clusterbased reducedorder modelling of a mixing layer".
J. Fluid Mech. 754, 365414.
 Noack, B.R., Morzynski, M. & Tadmor, G. (eds.) (2011)
"ReducedOrder Modelling for Flow Control,"
CISM Courses and Lectures 528,
SpringerVerlag.
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On this webpage, I want to acknowledge
the invaluable contributions of many friends and colleagues making this happen.
First of all, I am deeply grateful to the French
Agence Nationale de la Recherche (ANR)
for providing me such a Chair of Excellence
as generous flexible funding vehicle.
This was a warm welcome for my relocation to France.
Second, my employeer, the
French National Research Foundation (CNRS)
provides me all professorial rights and unparalleled academic freedom for my work.
A Director of Research CNRS is truly a dream position.
Third, I am indepted to Profs.
Markus ABEL,
Steven BRUNTON and
Rolf RADESPIEL
for providing us intellectual homes
for developping new control methods and experiments
in Potsdam (Germany), Brunswick (Germany) and Seattle (USA), respectively.
Early preparatory work (19882010)
The project was prepared more than two decades in advance.
I am deeply grateful to my mentors on the long journey.
 My PhD father Helmut ECKELMANN (MPI für Strömungsforschung)
has polished my talents
and deeply invested in me as my first living rolemodel, mentor and friend.
Under him, I have learned to appreciate a working experiment,
the exciting atmosphere of a familytype research group,
and the value of polished Journal publications.
 Andrzej BANASZUK (UTRC) has introduced me
to the exciting world of industrial applications and modern control theory.
He has always emphasized that the 'control theory of turbulence still needs to be invented'.
The joined work at UTRC has laid the road map for the following work until now.
 Andreas DILLMANN (TU Berlin 2003, now DLR)
and Rudibert KING (TU Berlin)
have mentored my career at TU Berlin under the excellent conditions
of the Collaborative Research Center (SFB 557) "Control of complex turbulent shear flows".
Our successful 'C5' project 'Lowdimensional modelling and control of turbulent shear flows'
laid the groundwork of much of our current work.
 William K GEORGE (Chalmers, Imperial, Princeton, ...)
has accompanied my career for almost a decade as an inspiring role model for turbulence research and networking "WikiThink" and as a friend.
Since the late 90's I have enjoyed a close collaboration with
Marek MORZYNSKI (Poznan, Poland)
and
Gilead TADMOR (Boston).
Day and night we have had discussion about many ideas and many joint projects,
leading to my most cited publications.
ANR Chair of Excellence (20102015)
The work of the Chair of Excellence has been shaped by many PhD students,
PostDocs, academic and industrial colleagues.
I count over 100 coauthors during 20102014.
I try to bring some order in my acknowledgments
by introducing contributors in terms of distance from Poitiers and in alphabetically order.
Poitevin TUCOROM team (local colleagues)
 JeanPaul BONNET and Yves GERVAIS
have supported my relocation and dream CNRS position in France.
JeanPaul has also pushed the TUCOROM mixinglayer demonstrator.
 Jacques BOREE has initiated the OpenLab PPRIME/PSA
enabling a fruitful collaboration with PeugeotCitroën
on open and closedloop drag reduction of car models.
 Laurent
CORDIER
was involved in many of my projects.
 Joel DELVILLE and Carine FOURMENT
have build up the TUCOROM mixinglayer control demonstrator.
Sadly, both have died in a tragic car accident,
too early to see the fruits and impact of their first feedback turbulence work.
 Tamir SHAQARIN is not from Poitiers,
but he has spend many months here.
He has invested his large expertize
in the actuation system of TUCOROM demonstrator and
explored a number of traditional control strategies
 Andreas SPOHN has supported all experimental activities
and has coinitiated the successful ANR SepaCoDe and PIRE projects.
Poitevin TUCOROM PostDocs
 Thomas DURIEZ
was an outstanding PostDoc.
Within few months he has developped the first showcases of machine learning control (MLC)
from dynamical systems, to direct numerical simulations and to several experiments in France.
He has lead the MLC implementations at PPRIME, PMMH, PRISM, LML.
 JeanCharles LAURENTIE has tamed the CONCURRENT data acquisition system and shaped the first MLC experiments.
 Vladimir PAREZANOVIC's role for our first TUCOROM mixing layer demonstrator can hardly be underestimated.
On the fireline between openloop protagonists and feedback control advocates,
he has improved the TUCOROM flagship experiment and lead our first MLC experiments to success.
 Michael SCHLEGEL's mathematical genius has lead to a number of exciting results,
e.g. the first criterion for boundedness of ROM and ROMbased control solutions (Schlegel & Noack 2015 JFM).
Poitevin PhD students in TUCOROM and offspring projects
 Diogo Barros (OpenLab PPRIME/PSA) has pioneered drag reduction of car models with highfrequency Coanda blowing.
The resulting drag reduction for the square Ahmed body were unprecedented 20%!
 Eurika KAISER
has developed clusterbased reducedorder modelling (CROM).
This is the first datadriven framework solving the Liouville equation, or, equivalently, the Hopf (1952) formalism.
We have first promising applications to strongly nonlinear control following Brocket's (1999) visionary paper.
 Kai von KRBEK has successfully worked on implementing MLC for separation control at
Institut PRISME, Orléns, France
and drag reduction at TU Braunschweig (under Dr. Richard SEMAAN).
He currently works on MLCbased drag reduction
under supervision of Prof. Robert MARTINUZZI (Calgary).
 Ruiying LI (OpenLab PPRIME/PSA) has joined us recently and pushes MLC in drag reduction of car models.
 Charles PIVOT (Region PoitouCharentes) has joined us recently working on reinforcement learning for control.
 Gilles TISSOT (Region+ENSMA 2014) has successfully
worked on ROMbased wake stabilization
with 4D VAR methods and DMD variants.
French TUCOROM collaborators
 JeanLuc AIDER and Nicolas GAUTIER (PMMH Paris)
have lead the first MLC experiment of a wallbounded shear layer (Gautier et al. 2015 JFM).
 Azeddine KOURTA, Nicolas MAZELLIER (PRISME, Orléns) and Michel STANISLAS (LML, Lille)
enabled two new MLC experiments via the ANR SepaCoDe project.
 Tony RUIZ and Fabien HARAMBAT (PSA, Velizy) cosupervise
MLC experiments for drag reduction of car models.
International TUCOROM team for
MLC

Markus ABEL (Potsdam) has introduced us to
the world of machine learning methods in 2013,
starting with the 'International Fori of Turbulence and Network Control (IFTNC1, IFTNC2)'.
Few months after the first ideas, we had the first feedback control demonstrations
of MLC in dynamical systems, DNS and the TUCOROM mixinglayer experiments
thanks to outstanding team of Poitevin and Potsdam PostDocs:
Thomas DURIEZ (now: CONICET),
JeanCharles LAURENTIE (now: U Montepellier),
Vladimir PAREZANOVIC (Poitiers)
and Marc SEGOND (now: Spain).
Another exciting IFTNC result was CROM
lead by Eurika KAISER (Poitiers/Florida).
 Steven BRUNTON (Seattle) has cosupervised the first control studies in the TUCOROM mixinglayer experiment
and Hydra II watertunnel. He has implemented various control theory approaches.
Since then, he has shaped the TUCOROM project
with a rich portefolio of control and machine learning methods
and giving us a new intellectual refuge for joint work in Seattle.

Rolf RADESPIEL,
Peter SCHOLZ and
Richard SEMAAN (TU Braunschweig)
are providing us a new platform and intellectual home
for feedback turbulence control experiments in Brunswick, Germany.
International TUCOROM team for
ROM
 Maciej BALAJEWICZ (now: UIUC) has introduced us to a new subgrid closure
based on a rotation of the subspace.
See, e.g. Balajewicz et al. 2013 JFM.
 With Zach BERGER, Mark GLAUSER, Jacques LEWALLE and Kerwin LOW (Syracuse U)
we have explored reducedorder modelling for jet noise control.
See, e.g. Berger et al. 2015 FTC.
 Sinisa KRAJNOVIC and Jan ÖSTH (Chalmers)
have accompanied our drag reduction experiments of cars with LES
and the first POD model of a highReynolds number flow around an Ahmed body
(Östh et al. 2014 JFM).
 Robert MARTINUZZI, Jason BOURGEOIS and Zara HOSSEINI (U Calgary)
have played a principal role in our experimental reducedorder modelling activities
(Bourgeois et al. 2014 JFM, Hosseini et al. 2015 EF).
Robert is now developping a new feedback wake stabilization experiment.
 Robert NIVEN (UNSW) has introduced us to the world of maximum entropy principles
and Bayesian inference.
One outcome is a MaxEnt closure of Galerkin systems (Noack & Niven 2012 JFM, 2013 CAM).
Control applications are explored in a joint ARC project.
 Bartosz PROTAS (McMaster) has pushed reducedorder modelling
with the first 4D VAR identification of constitutive equations (complete functions, not parameters).
The applications include dynamical systems (Protas et al. 2013 JNS)
and subgrid turbulence closures (Protas et al. 2014 JFM).
See the list of publication
for all published contributions.
TUCOROM collaborators and visitors
We have immensely profited from our many visitors.
Many ideas and publications were developed or at least initiated during their visit.
Visitors of 2014
 Yang WANG
(Invited researcher, 20141029..1101)
 Seminar: "Climate network reveals and predicts climate
variability and teleconnections"
 Kevin WEBSTER
(Invited researcher, 20141015..17)
 Seminar: "Approximation of Reachable Sets using Optimal Control and Support Vector Machines"
(20141016, 14:15h, CEAT)
 Thomas DURIEZ
(Invited researcher, 20141001..30)
 Steven Hendry Waldrip
(Invited researcher, 20140915..1130)
 Seminar: "Maximum Entropy Analysis of Hydraulic Pipe Networks"
(20141009, 1416h, CEAT)
 Florimond GUENIAT
(Invited speaker)
 Seminar: "Coherent structures, feature points and mixing"
(20140619, 1416h, CEAT)
 Gregg ABATE
(Invited researcher 20140613)
 Seminar: "International Science Program & EOARD Overview"
(20140614, 1011h, CEAT)
 Tamir SHAQARIN
(Invited Professor, 20140601..30)
 Bartek PROTAS
(Invited Professor, 20140421..27)
 Robert K. NIVEN
(Invited Professor, 20140308..1220)
 Seminar: "TBA"
(201405??, 1416h, CEAT)
 Jan ÖSTH
(Invited researcher, 20140210..19)
 Kai von Krbek
(Invited researcher, 20140203..0801)
 Seminar: "Machine learning control  a literature review"
(20140305, 1416h, CEAT)
 Seminar: "Wave transmission through a chain of nonlinear oscillators"
(20140306, 1416h, CEAT)
Visitors of 2013
 Olivier CADOT
(Invited speaker, 20131129)
 Seminar: "Reflectional symmetry breaking modes of the flow past parallelepiped bodies"
(20140422, 1416h, CEAT)
 Zachary Philip BERGER
(Invited researcher, 20130819..30)
 Helmut ECKELMANN
(Invited researcher, 20130715..19)
 Steven BRUNTON
(Invited researcher, 20130714..18)
 Luc PASTUR
(Invited seminar speaker, 20130709)
 Seminar:Timedelayed feedback control for experimental flows
(20130709, 1416h, LEA/SP2MI)
 Bartek PROTAS
(Invited researcher, 20120630..0705)
 Shervin BAGHERI
(Invited seminar speaker, 20130624..28)
 Seminar:Koopman modes for analysis of fluid flows
(20130625, 1416h, LEA/SP2MI)
 Marc SEGOND
(Invited researcher, 20130623..28)
 Steven BRUNTON
(Invited researcher, 20130623..27)
 Bartosz PROTAS
(Invited researcher, 20130614..16)
 Lutz LESSHAFT
(Invited seminar speaker, 20130611)
 Seminar:Instabilitybased approaches to aeroacoustic modeling.
(20130611, 1416h, LEA/SP2MI)
 Marc SEGOND
(Invited researcher, 20130602..8)
 Simone CAMARRI
(Invited seminar speaker, 20130604)
 Seminar:Global stability and sensitivity analysis of numerical and experimental flow fields with focus on flow control
(20130604, 1416h, LEA/SP2MI)
 Tamir SHAQARIN
(Invited researcher, 20130524..0710)
 Seminar: TBA
(201306??, 1416h, LEA/SP2MI)
 Maciej BALAJEWICZ
(Invited senior researcher, 20130511..0522)
 Seminar:Model order reduction of unsteady fluidstructure interactions
(20130514, 1416h, LEA/SP2MI)
 Sinisa KRAJNOVIC
(Invited senior researcher, 20130501..0730)
 Seminar: Numerical investigations of flow instabilities and passive flow control mechanism around generic vehicle bodies"
(20130521, 1416h, LEA/SP2MI)
 Jan ÖSTH
(Invited researcher, 20130501..0730)
 Steven BRUNTON
(Invited researcher, 20130413..21)
 Seminar: Reduced order unsteady aerodynamic models for closedloop feedback control
(20130417, 1416h, LEA/SP2MI)
Visitors of 2012
 Michael SCHLEGEL
(Invited researcher, 20121210..14)
 Robert NIVEN
(Invited senior researcher, 20121128..1216)
 Seminar:
Maximum Entropy Analysis of SteadyState Flow Systems
(20121207, 1416h, CEAT)
 Richard SEMAAN
(Invited seminar speaker, 20121122..24)
 Seminar: Fundamentals of highlift for future commercial aircraft, Overview of the Collaborative Research Centers SFB 880
(20121123, 1416h, CEAT)
 Sinisa KRAJNOVIC
(Invited senior researcher, 20121104..5)
 Jan HEILAND
(Invited researcher, 20121007..1014)
 Seminar: Two Approaches to Optimal Control of Linearized NavierStokes Equations  I. Direct Discretization of the Input to Output Behavior and II. Generalized Riccati Equations
(20121010, 1416h, CEAT)
 Razvan STEFANESCU
(Invited researcher, 20120903..09)
 Seminar: Trust region adaptive POD/DEIM 4DVar for a finiteelement shallow water equations model
(20120903, 1416h, LEA/SP2MI)
 Robert MARTINUZZI (Invited researcher, 20120715..0814)
 Marcin CHRUST (Invited speaker, 20120709..0711)
 Seminar: Direct Numerical Simulation of the dynamics of falling disks
(20120910, 1416h, LEA/SP2MI)
 Gregor GILKA (Invited researcher, 20120708..0715)
 Jason BOURGOIS (Invited researcher, 20120624..0706)
 Sinisa KRAJNOVIC
(Invited speaker, 20120624..26)
 Seminar: Large Eddy Simulation:
A tool for understanding of vehicle flows
(20120625 14:00, LEA/SP2MI)
 Thomas DURIEZ
(Invited speaker, 20120607..8)
 Seminar: Boundary layer and shear flow manipulation using DBD plasma actuator.
(20120608, 10:30, CEAT)
 Ionel Michael NAVON (and R. STEFANESCU) (Invited speaker, 20120601..0605)
 Seminar: POD/DEIM nonlinear model reduction and POD/4D VAR with TRUSTregion and dual weighting for models of the shallow water equations
(20120604, 1416h, LEA/SP2MI)
 Tamir SHAQARIN (Invited researcher, 20120601..0915)
 Seminar: Closed loop active separation control for a thick turbulent boundary layer
(20120619, 1415h, CEAT)
 Kerwin LOW
(Invited researcher, 20120601..0730)
 Seminar: Subsonic jet noise: Part I:
Progress towards the understanding of jet noise through shear layer excitation
(20120625, 14:0015:30, CEAT)
 Eurika KAISER
(Invited researcher, 20120601..0630)
 Jacques LEWALLE
(Invited researcher, 20120601..0630)
 Seminar: Subsonic jet noise: Part II: Progress toward the description of sources
(20120625, 15:3017:00h, CEAT)
 Nicholas KEVLAHAN (Invited speaker, 20120327)
 Seminar: A brief introduction to wavelet methods for the analysis and computation of turbulent flows
(20120327, 1416h, CEAT)
 JoseEduardo WESFREID (Invited speaker, 20120320)
 Seminar: Les structures cohérentes dans la transition à la turbulence et le contrôle des écoulements
(20120320, 1416h, LEA/SP2MI)
 Eurika KAISER
(Invited researcher, 20120313..16)
 Maciej BALAJEWICZ (Invited researcher, 20120301..31)
 Seminar: A new approach to model order reduction of the NavierStokes equations
(20120306, 1416h, CEAT)
 Bartek PROTAS (Invited researcher, 20120218..0331)
Visitors of 2011
 Vladimir PAREZANOVIC (Invited speaker, 20111208)
 Seminar: Experimental study of the sensitivity of global properties
of turbulent bluff body wakes using steady disturbance methods
(20111208, 1112h, CEAT)
 Jorge BAILONCUBA (Invited researcher, 20111128..1203)
 Seminar: POD models for turbulent convection in rectangular cells
(20111130, 1112h, CEAT)
 Michael SCHLEGEL (Invited researcher, 20111017..28)
 Ingrid HOTZ (Invited speaker, 20111017..19, CEAT)
 Seminar: Flow Feature Extraction from a Data Analysis Point of View
(20111018, 1416h, CEAT/Salle des Actes)
 Angelo IOLLO (Invited speaker, 20110920)
 Seminar: Modal representation for reduced order models
(20110920, 1416h, LEA/SP2MI)
 HansChristian HEGE (Invited researcher, 20110919..26, CEAT)
 Seminar: Visualising quantified uncertainty
(201109??, 1416h, LEA/SP2MI)
 Denis SIPP (Invited speaker)
 Seminar: Openloop control of instabilities in open flows
(20110913, 1416h, LEA/SP2MI)
 Jason BOURGOIS (Invited researcher, 20110901..30, CEAT)
 Aniruddha SINHA (Invited researcher, 20110619..26, CEAT)
 Seminar: Development of feedback control for high speed jets
(20110621, 1416h, LEA/SP2MI)
 Jens KASTEN (Invited researcher, 20110605..11, CEAT)
 Seminar: On the extraction and filtering of
Lagrangian features based on the acceleration
(20110607, 1416h, LEA/SP2MI)
 Gilead TADMOR (Invited researcher, 20110604..17, CEAT)
 Sergey OLADYSHKIN (Invited speaker, 20110515..17, CEAT)
 Seminar: Bayesian Updating on Arbitrary Polynomial Chaos Expansion:
Application to Carbon Dioxide Storage in Geological Formations
(20110516, 1416h, LEA/SP2MI)
 Michael SCHLEGEL (Invited researcher, 20110501..13, CEAT)
 Seminar 1: Kraichnan''s Direction Interaction Approximation.
Prelude: Renormalized Pertubation Theories
(20110504, 1417h, CEAT)
 Seminar 2: Kraichnan''s Direction Interaction Approximation.
Ideas, Failures and Successes.
(20110506, 1417h, CEAT)
 Seminar 3: Kraichnan''s Direction Interaction Approximation.
Epilogue: Extensions
(20110509, 1417h, CEAT)
 Jens KASTEN (Invited researcher, 20110424..30, CEAT)
 Seminar: On the extraction and filtering of Lagrangian features
(20110526, 14h CEAT)
 Marek MORZYNSKI (Invited researcher, 20110404..14, CEAT)
 Markus ABEL (Invited Professor, 20110401..0630, CEAT)
 Seminar 1: Dimension reduction tools
(20110502, 912h, CEAT)
 Seminar 2: Fluctuations of thermodynamic systems in finite time
(20110503, 912h, CEAT)
 Seminar 3: Turbulence characterization: Entropies, dimensions and in
how far they have reduced meaning for some applications
(20110504, 912h, CEAT)
 Robert NIVEN (Invited senior CNRS researcher, 20110305..0601, CEAT)
 Seminar 1: The Maximum Entropy Method of Jaynes
(20110321, 1417h, CEAT)
 Seminar 2: Application of MaxEnt to SteadyState Flow Systems
(and Extremum Entropy Production Principles)
(20110322, 1417h, CEAT)
 Seminar 3: Further Applications of MaxEnt to SteadyState Flow Systems
(20110323, 1417h, CEAT)