Federico Toschi, Ph.D.

a research website on fluid dynamics

Author: toschi (page 3 of 8)

Pinaki Kumar

Earthquake dynamics - Understanding Their physics from modeling soft glassy materials

pinakiDeveloping a quantitative connection between the physics of complex soft-glassy materials below yield stress and the dynamics of stick-slip faulting events leading to earthquakes. A novel formulation based on the multicomponent Lattice Boltzmann method is used to investigate fundamental issues related to natural seismicity, to find the interaction between spatially and temporally separated faulting events, as well as to determining the response of faults to external perturbations (i.e. induced seismicity) mimicking natural gas extraction and activities in injection wells. This earthquake model will then be fine tuned using inversion of surface seismic recordings.

Life in a Turbulent Environment

Life in a Turbulent Environment: How the Dynamic Ocean Shapes the Distribution, Diversity and Growth of Microorganisms 
Workshop at the Radcliffe Institute for Advanced Study at Harvard University, February 19-20, 2015
Link: http://projects.iq.harvard.edu/life_in_a_turbulent_environment

Executive Summary

This two-day workshop convenes expertise from the physical, biological and ocean sciences to stimulate a multidisciplinary discussion on how the dynamics of the ocean environment shapes life — ranging from individual plankton and microbes, to their collective ecosystems. How can we scale up our understanding from micro-environments to large-scale distributions, and from individual plankton to populations? How do the growth, transformation and transport of these populations therein affect the large-scale oceanic distributions of carbon, oxygen and nutrients? How does physical variability affect biological growth and patchiness, and how are physical and biological processes coupled through multiple space- and time-scales? From turbulence to ocean eddies — how does the dynamic ocean homogenize and differentiate environments to support growth? How do bio-diversity, species-composition, and size relate to the physical environment? And importantly, what changes can we anticipate in the evolution of planktonic and microbial marine ecosystems in the future? These are some of the questions that we will tackle through a series of talks and discussions in the convivial setting of the Radcliffe Institute at Harvard University.

Workshop Leaders

Amala Mahadevan

Homepage:  http://www.radcliffe.harvard.edu/people/amala-mahadevan

Federico Toschi

Homepage:  http://www.tue.nl/en/employee/ep/e/d/ep-uid/20089361/

David Nelson

Homepage:  https://www.physics.harvard.edu/people/facpages/nelson

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Particles in shear flows

Particles in shear flow

Fluctuating hydrodynamics

[sz-video url="http://vimeo.com/86315883"/]

[vimeo 86315883]

Alumni postdoc

Calin Dan -

Prasad Perkelar - Now faculty at TIFR Hyderabad (India)

Roger Jeurissen - Now at ACFD Consultancy (NL)

Badr Kaoui - Now postdoc at Universität Bayreuth (Germany)

Oleksii Rudenko - Now at ASML (NL)

Valentina Lavezzo - Now at Philips (NL)

Andrea Scagliarini - Now Staff Scientist, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (Germany)

Matteo Lulli - Now postdoc at University of Tor Vergata (Italy)

Sasia Tympel -

Alumni Ph.D. students

Florian Janoschek (defended 11 December 2013)

Cover Florian Janoschek

Theo Driessen (defended 20 December 2013, at University of Twente co-supervised with Detlef Lohse)

Theo Driessen cover

Sudhir Srivastava (defended 7 May 2014)

Cover Sudhir Srivastava

Riccardo Scatamacchia (defended 29 January 2015)

Cover Riccardo Scatamacchia

Francesca Storti  (defended 8 December 2014)

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Alessandro Corbetta (defended 1 February 2016)

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Michel van Hinsberg (defended 20 June 2016)
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Francesca Tesser (defended 14 December 2016)

 

Sten Reijers

Compressible effects in drops impacted by a laser pulse

StenThe impact of a laser pulse onto a liquid droplet induces strong deformation and propulsion of the droplet. Here, we aim to understand the droplet dynamics by performing lattice-Boltzmann simulations and doing a theoretical analysis. In the simulations, we model the laser impact as a pressure pulse on the droplet surface. The lattice-Boltzmann method provides an ideal framework to do this, as it allows multiphase fluids where we can study: phase change, bubble nucleation and compressibility effects (e.g. shock waves traveling inside the drop) induced by the pressure pulse. On the theoretical side, we want to get key insight in how the pressure-waves propagate and how velocity-fields build up as function of different pressure conditions on the boundary of the droplet.

Daan van Vugt

Kim Alards

Lagrangian analysis of rotating Rayleigh-Bénard turbulence

KimAlards

Kim

Dynamics of particles in cylindrical rotating Rayleigh-Bénard convection (RRBC) is studied using DNS, not only to understand the physics of RRBC, but also to investigate whether particles with a feedback reaction on the flow can influence the dynamics within the cell.
Lagrangian statistics is used to characterise flow structures and heat transport and statistics obtained in the cell center and near the top- and bottom plates are compared to study the role of boundary layers in RRBC. The cylindrical set-up moreover allows us to compare results directly to particle-tracking experiments in RRBC.
On top of Lagrangian statistics also clustering dynamics of particles with different properties, such as thermal inertia and buoyancy, is investigated. By including both mechanical and thermal two-way coupling we can analyse the influence of particles on the flow and study whether we can trigger a transition to enhanced heat transport, which can be beneficial for industrial applications.

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