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German Enrique Varas Siriany

Associate Professor

Pontificia UNIVERSIDAD CATOLICA DE VALPARAISO

Valparaiso, Chile

Out-of-equilibrium systems; Granular materials; Fluid Dynamics; three-phase flow systems; Crater formation

Physics, ECOLE NORMALE SUPERIEURE DE LYON. Francia, 2011
Physics, UNIVERSIDAD DE CHILE. Chile, 2007
Physics, UNIVERSIDAD DE CHILE. Chile, 2005

Assistant Professor Full Time

PONTIFICIA UNIVERSIDAD CATOLICA DE VALPARAISO

Science

Valparaiso, Chile

2011 - 2014
Associate Professor Full Time

PONTIFICIA UNIVERSIDAD CATOLICA DE VALPARAISO

Science

Valparaiso, Chile

2014 - A la fecha

Current Students

- René Zuñiga (Ph.D. in physics, Pontificia Universidad Catolica de Valparaiso, expected defense 2020).
- Elram Figueroa (Ph.D. in physics, Pontificia Universidad Catolica de Valparaiso, expected defense 2022).
- Cristobal Oliver (Ph.D. in physics, Pontificia Universidad Catolica de Valparaiso, expected defense 2019).

Former students
(2019) Cristian Villalobos - Msc thesis: Formación de un cráter en una capa granula que levita - [tesis]
(2018) Mauricio Housset - Msc thesis: Sincronización en la caída libre de objetos - [tesis]
(2015) Gabriel Ramos - Msc thesis: Dinámica de invasión de aire en un medio granular inmerso en agua

Visits
(2018) Antoine Parrenin (ENS Lyon) - Interaction of multiple Granular Jump - report
(2017-2018) Jérémy Vessaire (ENS Lyon) - PIV in immersed dunes
(2017) Florence Pollet (ENS Lyon) - Dunes formation by the impact of a liquid jet - report
(2015/2016) Raphael Poryles (ENS Lyon) - Characterization of air trapped in water-saturated sands

Guidance of undergraduate students (research internships)

- Roberto Rocco (UTFSM)

Summer research internship at PUCV (*=jointly supervised)

- From PUCV: Karin Alfaro, Mauricio Housset, Gabriel Ramos, Hector Ramos* (co-advised by F. Santibañez), Alexander Cruz.
- From U.Chile: Paul Silva*, Pablo Ugalde* (co-advised by C. Falcón).

Ph.D Fellowship, "Beca Gestion Propia para estudios de Doctorado en el extranjero"

CONICYT

Chile, 2007

Fellowship for 4 years (2007-2011)


3D morphology and timing of the giant fossil pockmark of Beauvoisin, SE Basin of France Vida, V; Varas, G; Favier, A; Tribovillard, N Article ISI SCOPUS JOURNAL OF THE GEOLOGICAL SOCIETY (2019)
Friction weakening by mechanical vibrations: A velocity-controlled process Lastakowski, H. Article ISI SCOPUS EUROPEAN PHYSICAL JOURNAL E (2019)
Influence of obstacles on bubbles rising in water-saturated sand Poryles, Raphaël; Radjai, F.; Nezamabadi, S.; Luding, S; Delenne, J.Y. Article SCOPUS EPJ Web of Conferences (2017)
Stability of gas channels in a dense suspension in the presence of obstacles Article ISI SCOPUS PHYSICAL REVIEW E (2017)
Bubbles trapped in a fluidized bed: Trajectories and contact area Poryles R.; Vidal, V; Varas, G Article ISI SCOPUS PHYSICAL REVIEW E (2016)
Gas-induced fluidization of mobile liquid-saturated grains Ramos, G; Varas, G; Geminard, JC; Vidal, V Article ISI SCOPUS Physical Review E - Statistical, Nonlinear, and Soft Matter Physics (2015)
Air invasion in a granular layer immersed in a fluid: morphology and dynamics Varas, G; Geminard, JC; Vidal, V Article ISI SCOPUS Granular Matter (2013)
Morphology of air invasion in an immersed granular layer Varas, G; Vidal, V; Geminard, JC Article ISI PHYSICAL REVIEW E (2011)
Venting dynamics of an immersed granular layer Varas, G; Vidal, V Article ISI PHYSICAL REVIEW E (2011)
Liquid-solid-like transition in quasi-one-dimensional driven granular media Clerc, MG; Cordero, P; Dunstan, J; Huff, K; Mujica, N; Risso D.; Varas, G Article ISI SCOPUS NATURE PHYSICS (2008)
Collective behavior in a granular jet: Emergence of a liquid with zero surface tension Cheng, X; Varas, G; Citron D.; Jaeger, H. M.; Nagel, S. R. Article SCOPUS PHYSICAL REVIEW LETTERS (2007)