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Turbulence and Particles in Environmental Fluid Dynamics (TIPFluiD)

English title Turbulence and Particles in Environmental Fluid Dynamics (TIPFluiD)
Applicant Holzner Markus
Number 144645
Funding scheme SNSF Professorships
Research institution Institut für Umweltingenieurwissenschaften ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Fluid Dynamics
Start/End 01.06.2013 - 31.05.2017
Approved amount 1'568'799.00
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All Disciplines (4)

Discipline
Fluid Dynamics
Zoology
Biochemistry
Environmental Research

Keywords (11)

Interface; Chemotaxis; Hydrodynamics; Particles; Sediment; Turbulence; Environmental; Fluid; Stratification; Hyporheic; Biofilm

Lay Summary (German)

Lead
Strömungen in unserer Umwelt sind turbulent und durch eine hohe Transportfähigkeit von Partikeln gekennzeichnet. Der Geschiebetransport in Flüssen oder die Dispersion von Plankton im Ozean sind Beispiele solcher Transportprozesse. Strömung und Partikel stehen dabei in Wechselwirkung, d.h. Partikel werden nicht einfach passiv mittransportiert, sondern sind aktiv und reagieren ihrerseits auf die Strömung zurück.
Lay summary

Inhalt und Ziel des Forschungsprojektes

Während der Transport von passiven Partikeln durch eine Strömung einigermassen gut verstanden ist und auch entsprechend modelliert werden kann, ist dies für den Fall von aktiven Partikeln nicht der Fall. TIPFluiD ist ein interdisziplinäres Forschungsprogramm, das ein besseres Verständnis von Wechselwirkungen zwischen Strömungen und aktiven Partikeln zum Ziel hat. Die Erwartung ist, dass diese Forschung tiefere Einblicke in wichtige Prozesse ermöglicht, die in aquatischen Ökosystemen stattfinden.

Das primäre Ziel dieses Projektes ist es, eine Forschungsgruppe aufzubauen, die auf die Themen Hydromechanik, Umwelttransportprozesse und die Interaktion zwischen Strömung und Organismen fokussiert. TIPFluiD ist in folgende Teilprojekte aufgeteilt. Jedes dieser Teilprojekte steht für einen Schlüsselprozess an der Schnittstelle zwischen Strömung und Partikeltransport.

1. Die Untersuchung des Dispersionsverhaltens von trägen Partikeln in einer Dichte-geschichteten Strömung.

2. Die Analyse von kollektivem Schwimmverhalten von Kopepoden unter dem Einfluss von hydrodynamischen und chemischen Gradienten.

3. Die Studie von Biofilm-Strömungsinteraktionen in porösen Medien auf Poren-skala.

4. Die Erfassung von Nährstoff- und Geschiebetransport durch die Hyporheische Zone in einem Gerinne.

TIPFluiD's interdisziplinäres Profil wird existente und neue nationale und internationale wissenschaftliche Zusammenarbeiten konsolidieren und fördern, wobei die zu erwartenden Resultate sowohl Grundlagen- als auch angewandte Forschung ansprechen. Neue Erkenntnisse werden über wissenschaftliche Publikationen in anerkannten Zeitschriften, über Vorträge an internationalen Konferenzen, sowie an nationalen Foren und Treffen verbreitet. Vom praktischen Standpunkt wird TIPFluiD lokalen Entscheidungsträgern für das Management von Wasserkraftwerken, Flussrenaturierungen und dem Design von biologischen Reaktoren von Nutzen sein.

Direct link to Lay Summary Last update: 22.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Lagrangian coherent structures and entrainment near the turbulent/non-turbulent interface of a gravity current
Neamtu-Halic Marius M., Krug Dominik, Haller George, Holzner Markus (2019), Lagrangian coherent structures and entrainment near the turbulent/non-turbulent interface of a gravity current, in Journal of Fluid Mechanics, 877, 824-843.
Mixing and entrainment are suppressed in inclined gravity currents
van Reeuwijk Maarten, Holzner Markus, Caulfield C. P. (2019), Mixing and entrainment are suppressed in inclined gravity currents, in Journal of Fluid Mechanics, 873, 786-815.
Determination of the Effective Viscosity of Non-newtonian Fluids Flowing Through Porous Media
Eberhard Ursin, Seybold Hansjoerg J., Floriancic Marius, Bertsch Pascal, Jiménez-Martínez Joaquin, Andrade José S., Holzner Markus (2019), Determination of the Effective Viscosity of Non-newtonian Fluids Flowing Through Porous Media, in Frontiers in Physics, 7, 71.
Quantifying physical disintegration of faeces in sewers: Stochastic model and flow reactor experiments
Penn Roni, Maurer Max, Michalec François-Gaël, Scheidegger Andreas, Zhou Jiande, Holzner Markus (2019), Quantifying physical disintegration of faeces in sewers: Stochastic model and flow reactor experiments, in Water Research, 152, 159-170.
A Novel Approach for 3D-Structural Identification through Video Recording: Magnified Tracking
Harmanci Yunus, Gülan Utku, Holzner Markus, Chatzi Eleni (2019), A Novel Approach for 3D-Structural Identification through Video Recording: Magnified Tracking, in Sensors, 19(5), 1229-1229.
Counter-current swimming of lotic copepods as a possible mechanism for drift avoidanceBenthic copepods swim actively to reduce downstream drift
Sidler Daniel, Michalec François-Gaël, Holzner Markus (2018), Counter-current swimming of lotic copepods as a possible mechanism for drift avoidanceBenthic copepods swim actively to reduce downstream drift, in Ecohydrology, 11(7), e1992-e1992.
The influence of bileaflet prosthetic aortic valve orientation on the blood flow patterns in the ascending aorta
Gülan Utku, Holzner Markus (2018), The influence of bileaflet prosthetic aortic valve orientation on the blood flow patterns in the ascending aorta, in Medical Engineering & Physics, 60, 61-69.
Blood flow patterns and pressure loss in the ascending aorta: A comparative study on physiological and aneurysmal conditions
Gülan Utku, Calen Christelle, Duru Firat, Holzner Markus (2018), Blood flow patterns and pressure loss in the ascending aorta: A comparative study on physiological and aneurysmal conditions, in Journal of Biomechanics, 76, 152-159.
Inhomogeneous growth of fluctuations of concentration of inertial particles in channel turbulence
Fouxon Itzhak, Schmidt Lukas, Ditlevsen Peter, van Reeuwijk Maarten, Holzner Markus (2018), Inhomogeneous growth of fluctuations of concentration of inertial particles in channel turbulence, in Physical Review Fluids, 3(6), 064301-064301.
Biofilms in 3D porous media: Delineating the influence of the pore network geometry, flow and mass transfer on biofilm development
Carrel Maxence, Morales Verónica L., Beltran Mario A., Derlon Nicolas, Kaufmann Rolf, Morgenroth Eberhard, Holzner Markus (2018), Biofilms in 3D porous media: Delineating the influence of the pore network geometry, flow and mass transfer on biofilm development, in Water Research, 134, 280-291.
Behavioral response of the freshwater cyclopoid copepod Eucyclops serrulatus to hydropeaking and thermopeaking in a laboratory flume
Sidler Daniel, Michalec François-Gaël, Holzner Markus (2018), Behavioral response of the freshwater cyclopoid copepod Eucyclops serrulatus to hydropeaking and thermopeaking in a laboratory flume, in Journal of Freshwater Ecology, 33(1), 115-127.
Pore‐Scale Hydrodynamics in a Progressively Bioclogged Three‐Dimensional Porous Medium: 3‐D Particle Tracking Experiments and Stochastic Transport Modeling
Carrel M., Morales V. L., Dentz M., Derlon N., Morgenroth E., Holzner M. (2018), Pore‐Scale Hydrodynamics in a Progressively Bioclogged Three‐Dimensional Porous Medium: 3‐D Particle Tracking Experiments and Stochastic Transport Modeling, in Water Resources Research, 54(3), 2183-2198.
Small-scale entrainment in inclined gravity currents
van Reeuwijk Maarten, Krug Dominik, Holzner Markus (2018), Small-scale entrainment in inclined gravity currents, in Environmental Fluid Mechanics, 18(1), 225-239.
Zooplankton can actively adjust their motility to turbulent flow
Michalec François-Gaël, Fouxon Itzhak, Souissi Sami, Holzner Markus (2017), Zooplankton can actively adjust their motility to turbulent flow, in Proceedings of the National Academy of Sciences, 114(52), E11199-E11207.
Clogging of an Alpine streambed by silt-sized particles – Insights from laboratory and field experiments
Fetzer Jasmin, Holzner Markus, Plötze Michael, Furrer Gerhard (2017), Clogging of an Alpine streambed by silt-sized particles – Insights from laboratory and field experiments, in Water Research, 126, 60-69.
Stochastic dynamics of intermittent pore-scale particle motion in three-dimensional porous media: Experiments and theoryPARTICLE MOTION DYNAMICS IN POROUS MEDIA
Morales V. L., Dentz M., Willmann M., Holzner M. (2017), Stochastic dynamics of intermittent pore-scale particle motion in three-dimensional porous media: Experiments and theoryPARTICLE MOTION DYNAMICS IN POROUS MEDIA, in Geophysical Research Letters, 44(18), 9361-9371.
Short-term exposure to gold nanoparticle suspension impairs swimming behavior in a widespread calanoid copepod
Michalec François-Gaël, Holzner Markus, Barras Alexandre, Lacoste Anne-Sophie, Brunet Loïc, Lee Jae-Seong, Slomianny Christian, Boukherroub Rabah, Souissi Sami (2017), Short-term exposure to gold nanoparticle suspension impairs swimming behavior in a widespread calanoid copepod, in Environmental Pollution, 228, 102-110.
Biofilm Imaging in Porous Media by Laboratory X-ray Tomography: Combining a Non-Destructive Contrast Agent with Propagation-Based Phase-Contrast Imaging Tools.
Carrel Maxence, Beltran Mario A., Morales Veronica Lorena, Derlon Nicolas, Morgenroth Eberhard, Kaufmann Rolf, Holzner Markus (2017), Biofilm Imaging in Porous Media by Laboratory X-ray Tomography: Combining a Non-Destructive Contrast Agent with Propagation-Based Phase-Contrast Imaging Tools., in Plos One, 1-18.
Inertial particles distribute in turbulence as Poissonian points with random intensity inducing clustering and supervoiding
Schmidt Lukas, Fouxon Itzhak, Holzner Markus (2017), Inertial particles distribute in turbulence as Poissonian points with random intensity inducing clustering and supervoiding, in Physical Review Fluids, 074302.
Fractal scaling of the turbulence interface in gravity currents
Krug Dominik, Holzner Markus, Marusic Ivan, van Reeuwijk Maarten (2017), Fractal scaling of the turbulence interface in gravity currents, in Journal of Fluid Mechanics, 820, R3-R3.
Shear-scaling-based approach for irreversible energy loss estimation in stenotic aortic flow – An in vitro study
Gülan Utku, Binter Christian, Kozerke Sebastian, Holzner Markus (2017), Shear-scaling-based approach for irreversible energy loss estimation in stenotic aortic flow – An in vitro study, in Journal of Biomechanics, 56, 89-96.
Small-scale entrainment in inclined gravity currents
van Reeuwijk Maarten, Krug Dominik, Holzner Markus (2017), Small-scale entrainment in inclined gravity currents, in Environmental Fluid Mechanics, 1-15.
Three-dimensional tracking of the motion of benthic copepods in the free water and inside the transparent sediment bed of a laboratory flume3D tracking of benthic copepods
Sidler Daniel, Michalec François-Gaël, Detert Martin, Holzner Markus (2017), Three-dimensional tracking of the motion of benthic copepods in the free water and inside the transparent sediment bed of a laboratory flume3D tracking of benthic copepods, in Limnology and Oceanography: Methods, 15(2), 125-139.
The turbulent/nonturbulent interface in penetrative convection
Holzner Markus, van Reeuwijk Maarten (2017), The turbulent/nonturbulent interface in penetrative convection, in Journal of Turbulence, 18(3), 260-270.
Multiscale analysis of the topological invariants in the logarithmic region of turbulent channels at a friction Reynolds number of 932
Lozano-Durán A., Holzner M., Jiménez J. (2016), Multiscale analysis of the topological invariants in the logarithmic region of turbulent channels at a friction Reynolds number of 932, in Journal of Fluid Mechanics, 803, 356-394.
Solvable continuous-time random walk model of the motion of tracer particles through porous media
Fouxon Itzhak, Holzner Markus (2016), Solvable continuous-time random walk model of the motion of tracer particles through porous media, in Physical Review E, 94(2), 022132-022132.
Breakup of Finite-Size Colloidal Aggregates in Turbulent Flow Investigated by Three-Dimensional (3D) Particle Tracking Velocimetry
Saha Debashish, Babler Matthaus U., Holzner Markus, Soos Miroslav, Lüthi Beat, Liberzon Alex, Kinzelbach Wolfgang (2016), Breakup of Finite-Size Colloidal Aggregates in Turbulent Flow Investigated by Three-Dimensional (3D) Particle Tracking Velocimetry, in Langmuir, 32(1), 55-65.
Clustering of particles in turbulence due to phoresis
Schmidt Lukas, Fouxon Itzhak, Krug Dominik, van Reeuwijk Maarten, Holzner Markus (2016), Clustering of particles in turbulence due to phoresis, in Physical Review E, 93(6), 1-21.
High-Resolution Measurements of Turbulent Flow Close to the Sediment–Water Interface Using a Bistatic Acoustic Profiler
Brand Andreas, Noss Christian, Dinkel Christian, Holzner Markus (2016), High-Resolution Measurements of Turbulent Flow Close to the Sediment–Water Interface Using a Bistatic Acoustic Profiler, in Journal of Atmospheric and Oceanic Technology, 33(4), 769-788.
Lipid nanocapsules for behavioural testing in aquatic toxicology: Time–response of Eurytemora affinis to environmental concentrations of PAHs and PCB
Michalec François-Gaël, Holzner Markus, Souissi Anissa, Stancheva Stefka, Barras Alexandre, Boukherroub Rabah, Souissi Sami (2016), Lipid nanocapsules for behavioural testing in aquatic toxicology: Time–response of Eurytemora affinis to environmental concentrations of PAHs and PCB, in Aquatic Toxicology, 170, 310-322.
On the accuracy of viscous and turbulent loss quantification in stenotic aortic flow using phase-contrast MRIQuantification of Viscous and Turbulent Losses
Binter Christian, Gülan Utku, Holzner Markus, Kozerke Sebastian (2016), On the accuracy of viscous and turbulent loss quantification in stenotic aortic flow using phase-contrast MRIQuantification of Viscous and Turbulent Losses, in Magnetic Resonance in Medicine, 76(1), 191-196.
Characterization of intermittency in zooplankton behaviour in turbulence
Michalec François-Gaël, Schmitt François G., Souissi Sami, Holzner Markus (2015), Characterization of intermittency in zooplankton behaviour in turbulence, in The European Physical Journal E, 38(10), 108-115.
Intermittent Lagrangian velocities and accelerations in three-dimensional porous medium flow.
Holzner M., Morales V. L. M., Willmann M., Dentz M. (2015), Intermittent Lagrangian velocities and accelerations in three-dimensional porous medium flow., in Phys. Rev. E, 92, 013015.
Numerically accurate computation of the conditional trajectories of the topological invariants in turbulent flows
Lozano-Durán Adrián, Holzner Markus, Jiménez Javier (2015), Numerically accurate computation of the conditional trajectories of the topological invariants in turbulent flows, in Journal of Computational Physics, 295, 805-814.
The turbulent/non-turbulent interface in an inclined dense gravity current
Krug Dominik, Holzner Markus, Lüthi Beat, Wolf Marc, Kinzelbach Wolfgang, Tsinober Arkady (2015), The turbulent/non-turbulent interface in an inclined dense gravity current, in Journal of Fluid Mechanics, 765, 303-324.
Turbulence triggers vigorous swimming but hinders motion strategy in planktonic copepods
Michalec F. G., Souissi S., Holzner M. (2015), Turbulence triggers vigorous swimming but hinders motion strategy in planktonic copepods, in Journal of the Royal Society Interface, 12(106), 20150158.
The turbulence boundary of a temporal jet
van Reeuwijk Maarten, Holzner Markus (2014), The turbulence boundary of a temporal jet, in Journal of Fluid Mechanics, 739, 254-275.
Lipid nanocapsules for behavioural testing in aquatic toxicology: time-response of Eurytemora affinis to environmental concentrations of PAHs and PCB.
Michalec F. G., Holzner M., Souissi A., Stancheva S., Barras A., Boukherroub R., Souissi S., Lipid nanocapsules for behavioural testing in aquatic toxicology: time-response of Eurytemora affinis to environmental concentrations of PAHs and PCB., in Aquatic Toxicology.

Datasets

Biofilm Imaging in Porous Media by Laboratory X-ray Tomography: Combining a Non-Destructive Contrast Agent with Propagation-Based Phase-Contrast Imaging Tools.

Author Carrel, Maxence
Persistent Identifier (PID) 10.17612/P7Q07W
Repository Digital Rocks


Bioclogging in porous media - Particle Trajectory Data

Author Carrel, Maxence
Persistent Identifier (PID) 10.3929/ethz-b-000237865
Repository ETH Research Collection


Research Data supporting: "The influence of bileaflet prosthetic aortic valve orientation on the blood flow patterns in the ascending aorta"

Author Gülan, Utku
Persistent Identifier (PID) 10.3929/ethz-b-000264751
Repository ETH Research Collection


Collaboration

Group / person Country
Types of collaboration
Fluid Dynamics Group / Universidad Politecnica de Madrid Spain (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Weizmann Institute Israel (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Process Engineering in Urban Water Management / IfU, D-BAUG (ETH Zürich) and EAWAG Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Marine and Aquatic Sciences / Université de Lille and CNRS France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
River Engineering / VAW, D-BAUG (ETH Zürich) Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Fluid Mechanics Section / Department of Civil and Environmental Engineering, Imperial College London Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Complex Dynamics and Turbulence / Max Planck Institut for Dynamics and Selforganisation Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
EGU General Assembly 2019 Talk given at a conference Active response of freshwater invertebrates to hydro-and thermopeaking in a laboratory flume 07.04.2019 Vienna, Austria Holzner Markus;
ASLO Ocean Sciences Meeting Talk given at a conference Zooplankton can actively adjust their motility to turbulent flow 11.02.2018 San Diego, United States of America Holzner Markus;
Summer school "Turbulent flows" Individual talk Turbulent entrainment 24.07.2017 London, Great Britain and Northern Ireland Holzner Markus;
Environmental Fluid Mechanics Symposium Individual talk Turbulence and environmental transport: at the frontiers of fluid mechanics and ecohydraulics 26.06.2017 Pittsburgh, United States of America Holzner Markus;
Environmental Engineering Seminar Individual talk Bioclogging in porous media 08.06.2017 Davis, United States of America Carrel Maxence;
Hydraulics Symposium Individual talk Turbulence and environmental transport: at the frontiers of fluid mechanics and ecohydraulics 28.04.2017 Lausanne, Switzerland Holzner Markus;
AGU Fall Meeting Talk given at a conference Bioclogging in Porous Media: Preferential Flow Paths and Anomalous Transport 12.12.2016 San Francisco, United States of America Holzner Markus;
ICTAM Internation Congress of Theoretical and Applied Mechanics Talk given at a conference Copepod relocation and escape jumps in turbulence 21.08.2016 Montreal, Canada Holzner Markus;
River Flow 2016 Talk given at a conference 3D observation of the behavior of benthic copepods in a transparent gravel bed 12.07.2016 St. Louis, United States of America Sidler Daniel;
Biofilms 7 Talk given at a conference Bioclogging in porous media: preferential flow paths and anomalous transport 26.06.2016 Porto, Portugal Carrel Maxence;
Future Engineering Individual talk Fluid Mechanics in Future Engineering 01.03.2016 Newcastle Upon Tyne, Great Britain and Northern Ireland Holzner Markus;
American Physical Society 68th Annual Division of Fluid Dynamics Meeting Talk given at a conference Phoresis-induced clustering of particles in turbulence 22.11.2015 Boston, United States of America Schmidt Lukas;
SURF Seminar Individual talk Turbulence in environmental systems 02.11.2015 Luzern, Kastanienbaum, Switzerland Holzner Markus;
European Turbulence Conference 15 Individual talk CLUSTERING OF PARTICLES DRIVEN BY SALINITY GRADIENTS IN TURBULENCE 25.08.2015 Delft, Netherlands Holzner Markus; Schmidt Lukas;
Conditional statistics along lines and trajectories in turbulence Talk given at a conference Conditional statistics relative to the TNTI in a gravity current 24.08.2015 Aachen, Germany Holzner Markus;
IWA Specialized Conference: Biofilms in drinking water systems Poster Mesoscale investigation of the influence of turbulence on biofilm structures 23.08.2015 Arosa, Switzerland Carrel Maxence;
Summer school in Flow and Transport in Porous and Fractured Media Individual talk Biofilm growth in porous media investigated by 3D PTV 20.07.2015 Corsica, France Carrel Maxence;
LSTM Colloquium Individual talk Turbulence in biological and biomedical flow 12.06.2015 Erlangen, Germany Holzner Markus;
Interaction of microscopic structures and organisms with fluid flows Individual talk Biofilm-flow interactions in porous media 25.05.2015 Udine, Italy Carrel Maxence;
Flowing Matter Across the Scales Talk given at a conference Swimming behavior of zooplankton in turbulent flow 24.03.2015 Rome, Italy Holzner Markus;
Thermo & fluid dynamics Colloquium Individual talk Turbulence in environmental systems 18.03.2015 Zurich, Switzerland Holzner Markus;
Fluid flow and its applications Individual talk Turbulence in environmental systems 28.01.2015 Oslo, Norway Holzner Markus;
Hydromechanics symposium Individual talk Turbulence and particles in environmental flows 17.12.2014 Vienna, Austria Holzner Markus;
ZHydro: Hydrology Seminar Zurich Poster Behavioral response of benthic copepods to changes in turbulence and temperature 12.11.2014 Zurich, Switzerland Sidler Daniel;
iTi1024 Conference on Turbulence VI Poster Clustering of diffusiophoretic particles in turbulent flow 21.09.2014 Bertinoro, Italy Schmidt Lukas;
Fluid Mechanics Conference 2014 Individual talk Clustering of diffusiophoretic particles in turbulent flow 14.09.2014 Kopenhagen, Netherlands Schmidt Lukas;
Biofilms6 Poster Investigation of the biofilm-flow interactions with three-dimensional Particle Tracking Velocimetry, Optical Coherence Tomography and Confocal Laser Scanning Microscopy 11.05.2014 Vienna, Austria Carrel Maxence;
AGU Fall Meeting 2013 Talk given at a conference Intermittent behavior of Lagrangian velocity and acceleration in a three dimensional porous medium flow. 09.12.2013 San Francisco, United States of America Holzner Markus;
APS Division of Fluid Dynamics 66th Annual Meeting Talk given at a conference The turbulence boundary of a temporal jet 24.11.2013 Pittsburgh, United States of America Holzner Markus;


Self-organised

Title Date Place
Euromech Colloquium 590 03.07.2017 London, Great Britain and Northern Ireland
Lecture course Inertial Particles in Turbulence 06.06.2014 Zurich, Switzerland

Communication with the public

Communication Title Media Place Year
Media relations: print media, online media Plankton schwimmt gegen den Strom German-speaking Switzerland 2017
Media relations: print media, online media Ruderfusskrebse bewegen sich in turbulenter Strömung mit Sprüngen Blick Online German-speaking Switzerland 2017
Media relations: print media, online media Tierwelt - Ruderfusskrebse bewegen sich in turbulenter Strömung mit Sprüngen NZZ Online Western Switzerland 2017

Awards

Title Year
ETH Silver Medal for an Outstanding PhD thesis 2016

Use-inspired outputs


Start-ups

Name Year

Associated projects

Number Title Start Funding scheme
172916 Turbulence and Particles in Environmental Fluid Dynamics (TENACEOUS) 01.06.2017 SNSF Professorships
150794 Darwin Duo Laser 01.12.2013 R'EQUIP
159686 Novel approach for image-based estimation of stenosis severity and energy loss in aortic flow 01.09.2015 Interdisciplinary projects

Abstract

Turbulence is ubiquitous in nature and so is its ability to form interfaces and promote mixing and dispersion of species and particles across them. Sharp and strongly convoluted turbulence interfaces exist at the edges of free-shear flows such as effluent jets from waste-water outlets, atmospheric boundary layers and wakes of aircrafts. Interfaces appear at the boundaries of clouds in the atmosphere or in stratified flows in the ocean and lakes or between turbulent river flow and its sediment bed and they have a major importance on the flow dynamics because of their impact on transport of mass, heat and momentum. The dynamics of turbulence interfaces is intimately related to transport of particulate matter such as sediment grains or organic matter, which is of major significance for pollution dispersion in the atmosphere, sediment transport in rivers, formation of biofilms, and plankton dynamics - and they constitute an outstanding scientific research problem with immediate practical applications. TIPFluiD is an interdisciplinary professorship program aimed at understanding feedback mechanisms between fluid interfaces and transported particles for the case where particles are active, i.e. they react back to the flow due to inertia or motility. Up to now our understanding of such mechanisms is limited mainly because the interaction between fluid flow and active particles has received little attention and appropriate measurements are challenging to obtain. The expectation is that a better understanding of such feedback processes will significantly advance our understanding of environmental flows and important ecological processes occurring in aquatic ecosystems. Many aspects of turbulence interfaces and associated transport of particles have been studied extensively in the literature, but only recently have the technical and conceptual tools matured to a level that enables addressing fluid-particle interactions at a suitable range of spatial and temporal scales. In particular, experiments and numerical simulations that rely on the Lagrangian approach, i.e. based on a moving frame reference system that follows the motion of particles and interfaces, are available today at sufficient temporal and spatial resolutions. They allow studying key environmental problems such as turbulent folding of fluid interfaces in contaminant dispersion, re-suspension and deposition of sediment particles, collective motion of planktonic organisms, coupling between hydrodynamics and biofilm growth, in a most direct way. The aim of TIPFluiD is to establish a team that focuses on hydromechanics, environmental transport processes and flow-organism interactions with the following four objectives: 1. The study of the characteristics of turbulence interfaces in the presence of a density stratification and their effect on dispersion of inertial particles (PhD 1); 2. The analysis of collective swimming behaviour of copepods under the influence of hydrodynamic and chemical gradients (PhD 2); 3. The study of biofilm-flow interactions in porous media at pore scale (PhD 3); 4. The assessment of the transport of sediments and nutrients across the hyporheic region in open channel flow (Postdoc). In order to target these objectives, TIPFluiD is framed into 4 independent, but strongly interconnected research modules, involving 3 PhD students and one Postdoc. Each module stands for a key process at the interface between environmental fluid flow and particle transport. The module addressing transport of sediments and nutrients across the hyporheic interface covers the largest topical range and is designed as an integrative module where the strings are pulled together. For this reason the investigation of this part is assigned to a Postdoc with the ability to help the professorship with the coordination of the work of the PhD students. The project will be carried out in research modules by complementing laboratory experiments, numerical simulations and field measurements. TIPFLuiD’s multidisciplinary profile will favour and consolidate existing international and national scientific collaborations, with anticipated results meeting both basic and practical research questions. Diffusion of knowledge will hence be promoted by relevant publications in professional peer-reviewed international journals, presentations at relevant both international conferences (e.g. IAHR, EGU, AGU) and national scientific forums. From a practical viewpoint TIPFluiD will help local decision makers for the planning of dam operations, river management, restoration works and the design of biological reactors.
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