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Trajectory-based Lagrangian approaches for the extraction and characterization of coherent structures in turbulent convection

Project: Research

Project participants

Description

Turbulent fluid flows often exhibit large-scale, long-lived dynamical structures that have a crucial impact on global transport and mixing. The origin and dynamics of these superstructures, and their influence on turbulent flow properties are far from being understood. The Priority Programme aims at arriving at a comprehensive characterization and understanding of turbulent superstructures in an interdisciplinary effort. To this end, there is a need for mathematical descriptions of coherent structures in fluid motion and for corresponding efficient and reliable numerical methods for their identification, extraction and tracking, as well as for the quantification of the underlying transport processes. In this project, we will develop mathematically rigorous computational approaches to approximate and characterize coherent structures in turbulent flows. For this, we will make use of concepts from dynamical systems and ergodic theory as well as data mining. In particular, the computational methods will be tailored to directly work with Lagrangian particle trajectories, such as obtained from experiments involving particle tracking or from a particle model in direct numerical simulations. Central tools will be a transfer operator-based framework and spatio-temporal clustering schemes. They will allow us to analyze the emergence and dynamics of superstructures in three-dimensional turbulence. In cooperation with our interdisciplinary project partners within the Priority Programme, we will in particular study coherent behavior in turbulent convection, but also in other systems.
StatusFinished
Period01.09.16 → 31.12.19
Linkshttp://gepris.dfg.de/gepris/projekt/316204571
http://www.tu-ilmenau.de/de/turbspp/

Activities

Research outputs

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Publications

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  2. Neural network-based adaptive fault-tolerant control for strict-feedback nonlinear systems with input dead zone and saturation
  3. Effects of welding conditions on microstructural transformations and mechanical properties in AE42-HP friction welded joints
  4. Ein modifiziertes Newton-Verfahren zur Lösung des Hochrechnungsproblems nach dem Prinzip des minimalen Informationsverlustes
  5. Different approaches to learning from errors: Comparing the effectiveness of high reliability and error management approaches
  6. Impulsive Feedback Linearization for Decoupling of a Constant Disturbance with Low Relative Degree to Control Maglev Systems
  7. Intrinsic, instrumental and relational values behind nature’s contributions to people preferences of nature visitors in Germany
  8. Zuwanderungsbezogene Disparitäten bei der Diagnose eines sonderpädagogischen Förderbedarfs Lernen und der besuchten Schulart
  9. Chronological and sedimentological investigations of the Late Pleistocene succession in Osterbylund (Schleswig-Holstein, Germany)
  10. Mit Apps gegen den Tinnitus? Ein systematisches Review zu Qualität, Interventionselementen und Techniken der Verhaltensänderung
  11. Using Long-Duration Static Stretch Training to Counteract Strength and Flexibility Deficits in Moderately Trained Participants
  12. Random measurement and prediction errors limit the practical relevance of two velocity sensors to estimate the 1RM back squat
  13. Determination of rutin in green tea infusions using square-wave voltammetry with a rigid carbon-polyurethane composite electrode
  14. Effects of pesticide application and plant sexual identity on leaf physiological traits and phyllosphere bacterial communities
  15. Dynamische Modellierung der Sorption von Substanzen in einem hydrologischen Einzugsgebietsmodell anhand des Beispiels Phosphor
  16. Variability in leaf traits reveals contrasting strategies between forest and grassland woody communities across southern Brazil
  17. Functional trait similarity of native and invasive herb species in subtropical China-Environment-specific differences are the key
  18. CaO dissolution during melting and solidification of a Mg-10 wt.% CaO alloy detected with in situ synchrotron radiation diffraction
  19. The identification of up-And downstream industries using input-output tables and a firm-level application to minority shareholdings
  20. Fluorometer controlled apparatus designed for long-duration algal-feeding experiments and environmental effect studies with mussels
  21. Verification of measuring the bearing clearance using kurtosis, recurrences and neural networks and comparison of these approaches
  22. Reliability and validity of the self-report version of the Strengths and Difficulties Questionnaire (SDQ) in primary school children
  23. Do We Really Know The Benefit Of Machine Learning In Production Planning And Control? A Systematic Review Of Industry Case Studies
  24. Are Retirees More Satisfied? Anticipation and Adaptation Effects of Retirement on Subjective Well-Being: A Panel Analysis for Germany
  25. Performanznahe und videobasierte Messung von DaZ-Kompetenz bei Lehrkräften: Skalierung und dimensionale Struktur des Testinstruments