Kick-Off Meeting for Phase 2 SPP 1881

Turbulent Superstructures

Ilmenau, 10th to 11th December 2019

Outline

• Review process• What is important for phase 2?• Next activities in 2020

Review for Phase 2

• Review in May 2019 in Bonn with an international panel of experts

• 33 new proposals submitted (22 old, 11 new)• 20 were funded (13 old, 7 new)• Mathematics projects nearly completely kicked out

(but the Lagrangian analysis of superstructures has tobe continued)

• 3 new experimental projects in convectionaddressing RBC in fluids at different Pr (air, water, liquid metals)

• 3 Mercator Fellows (Janet Scheel, Ramis Örlü, Juan Pedro Mellado)

Bruno Eckhardt(1960-2019)

Phase space analysis in complex systems - From quantum dynamics to turbulent flows

We also offer individual fellowships (phd, postdoc, sabbatical). Applications are accepted continuously. For details, please check www.pks.mpg.de/visitors

International Focus Workshop7 - 9 April 2020The focus of this workshop is on the current state of phase space analysis in complex nonlinear systems applied to transitional and turbulent flows, active living matter and quantum systems. The meeting is held in memoriam of Prof. Bruno Eckhardt, whose pioneering work over the past decades has led to significant developments in this field.

Applications are welcome and should be made by using the application form on the event‘s web page. The number of attendees is limited. The registration fee for the international focus workshop is 140 Euro and should be paid by all participants. Costs for accommodation and meals will be covered by the Max Planck Institute. Limited funding is available to partially cover travel expenses.

Topics:� Periodic orbit theory

� Chaotic repellors and strange saddles

� Simple quantum systems

� Synchronization phenomena

� Front propagation

� Patterns in active living matter

� Transition to turbulence

� Edge states in simple shear flows

� Exact coherent states

� Fluid turbulence

� Turbulent convection

� Turbulent superstructures

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For further information please contact:Visitors Program – Mandy LocharMPI for the Physics of Complex SystemsNöthnitzer Str. 38, D-01187 DresdenTel: +49-351-871-1933Fax: +49-351-871-2199quatur20@pks.mpg.dewww.pks.mpg.de/quatur20

Applications received before 15 December 2019 are considered preferentially.

Invited speakers:Mahesh M. Bandi (JP)Eberhard Bodenschatz (DE)Guido Boffetta (IT) Predrag Cvitanović (US)Charles R. Doering (US)Michael D. Graham (US)Björn Hof (AT)Rich Kerswell (UK)Daniel Lathrop (US) Peter Lenz (DE)Moritz Linkmann (DE)Detlef Lohse (NL) Valerio Lucarini (UK) Beverley J. McKeon (US)Bernhard Mehlig (SE)Jeff Moehlis (US)Alexander Morozov (UK)

Arkady Pikovsky (DE)Itamar Procaccia (IL)Katepalli R. Sreenivasan (US)Tamás Tél (HU)Laurette Tuckerman (FR)Holger Waalkens (NL)Jakub Zakrzewski (PL)Walter Zimmermann (DE)

Scientific coordinators:Jörg SchumacherIlmenau, GermanyTobias SchneiderLausanne, Switzerland

Organisation:Mandy Lochar MPIPKS Dresden

image courtesy of Johan J. Ingles-Le Nobel http://extreme-macro.co.uk/

a picture (square and preferably 300 dpi)

© Moehlis, Faisst & Eckhardt, New Journal of Physics, vol. 6, article no. 56 (2004)

Very Large Scale Motion in laboratory flow

Elongated superstructures are visualized with high-resolution 4d particle tracking systems at high Reynolds numbers

Schanz, Novara, Geisler, Agocs, Eich, Bross, Kähler & Schröder, ISPIV, accepted (2019)

Boundary layer at Ret=2000 at y =0.4 d

Fingerprint of Turbulent Superstructures (TSS)

Turbulent Pipe flow

0 1 2 3 4 5 6 7 8 9x/D

y/D

0

0.

5

1

Ret=15545

Zanoun, Öngüner, Egbers, Bellani& Tallamelli, arXiv:1902.08263

PIV Measurement in plane

Coherent sets

Coherent or nearly coherent sets in phase space, fluid volume, ...

How do we quantify Lagrangian coherence?

• We try to determine the coherent set itself→ Set – based methods

• We try to determine the manifold that surrounds the coherent set→ Manifold – based methods

• Both classes of methods are tied to material transport in the flow in contrast to the Eulerian analysis

0 1 2 3 4 5 6 7 8 9

x/D

y/D

0

0.

5

1

Peter Koltai, FU Berlin

Coherent

Double Gyre Flow Double Gyre Flow

Lagrangian coherent sets

Not coherent

Short- and long-term goals• 1st Period

• Identify joint activities between funded projects withinthe six work packages

• Identify benchmark problems for open and closedflows to apply the new methods and algorithms

What‘s next?

• Is spatial and/or temporal filtering also useful forlong-term Lagrangian analysis of superstructures?

• Which connection exists between Eulerian Exact CoherentStates and Lagrangian Coherent Sets and their bifurcations?

• Do near-wall structures provide the foundations for turbulent superstructures in the bulk?

• Does a variation of boundary scales affect the formation anddynamics of a turbulent superstructure?

Networking (Phase 1)Project PI Flow Work packages Networking Adams B F Karrasch

Avila B B,C,D,F Dellnitz,Egbers,Haller,Mellado

Dellnitz B A,B,F Avila,Eckhardt,Frohnapfel,Junge

Linkmann/Eckhardt C B,C Avila,Dellnitz,Junge,Oberlack,Rist

Egbers B A,D,F,B Avila,Kähler,Frohnapfel,Schröder

Frohnapfel B B,D,F Dellnitz,Egbers,Haller,Koltai,Rist,

Schröder

Haller A,C A,B Holzner,Karrasch

Holzner C D,E Haller,Mellado

Junge/Karrasch A D,E Adams,Dellnitz,Eckhardt,Haller,Koltai,

Schumacher

Kähler C A,B,C,D,E Egbers,Padberg-Gehle,Rist,Schröder,

Westermann

Koltai A,B,C A,D,F Frohnapfel,Karrasch,Padberg-Gehle,

Schumacher,Weiss

Lohse A,B A,B,C,D Egbers,Shishkina,Weiss

Project PI Flow Work packages Networking Mellado A,C A,B,C Avila,Holzner,WilczekOberlack B A,C EckhardtPadberg-Gehle A A Junge,Karrasch,Koltai,Schumacher,

Linkmann/EckhardtRist C A,F Frohnapfel,Kähler,WestermannSchröder A,C A,C,D,E Frohnapfel,Kähler,Karrasch,Rist,

WeissSchumacher A A,B Koltai, Padberg-

Gehle,Westermann,WilczekShishkina A,B A,C,D Egbers,Lohse,WeissWeiss A,C D Koltai,Lohse,Mellado,Schröder,

ShishkinaWestermann A A,C,D,E Junge,Kähler,Padberg-Gehle,

SchumacherWilczek A B,F Mellado,SchumacherValori/Schumacher (Z)

A A,B Kähler

Short- and long-term goals• 1st Period

• 2nd Period

• Identify joint activities between funded projects withinthe six work packages

• Identify benchmark problems for open and closedflows to apply the new methods and algorithms

• Setup of networking• Enhanced focus on experiments• Synergistic phase to get the deeper quantitative and

qualitative understanding of TSS• Scale up the problems to large Reynolds numbers

Next activities• SPP Minisymposium on 17 March 2020 at Annual GAMM Meeting in Kassel

(Avila, Cierpka, Egbers, Kähler, Padberg-Gehle, JS)

• International Focus Workshop in memoriam of Bruno Eckhardt from 07 to 09 April 2020 in Dresden

• Fall School for PhD students/Postdocs, from 21 to 25 September 2020 in Rothenburg ob der Tauber

• Next Annual Meeting from 08 to 10 December 2020 in Rastatt

• Long term: Application for IUTAM Symposium on Turbulent Superstructures in 2022(most probably planed in Weimar)

Program

• Two keynote speakers:

• Thanks to the local organizers (Philipp Vieweg, Dorothee Hering)

Dr. Basile GalletCEA Saclay

Prof. Alexander J. SmitsPrinceton University