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INTERPRETING FREE SURFACE SIGNATURES - FROM DROPLETS TO GLACIERS

Mercredi 9 juillet 2014 14:00 - Duree : 1 heure
Lieu : Conference room - LIPhy - Bât E - 140 Avenue de la Physique - St Martin d’Hères. Accès par interphone, appeler le secrétariat

Orateur : Mathieu SELLIER (University of Canterbury in Christchurch, New Zealand)

Free surface flows arise in many areas of engineering and science from micron scale droplets to large scale geophysical flows. Over the recent past, our understanding of such flows has considerably grown in part owing to the rapid combined development of numerical methods and computational resources. Such flows are often investigated in the usual cause to effect paradigm. For example, how would the free surface of a river respond to a topographic feature ? How is the motion of a contact line affected by the rheology of a fluid ? The inverse problem which explores the effect to cause relationship opens up many fascinating questions. In this seminar, a couple of recent examples of such inverse problems are presented. The first one is at a microscopic length scale and relates to the identification of the viscosity of atmospheric particles by means of a simple poke flow technique.

The idea behind this technique is to poke the fluid particles deposited on a surface with a sharp needle hence creating a dry patch and try to relate the hole relaxation time to the particle viscosity. Two simplified models will be presented to approach this problem. The second problem involves a much larger length scale and deals with glaciers. At present, the identification of the bedrock of a glacier is a tedious, expensive, and time consuming process. On the other hand measuring the free surface of a glacier can be achieved more readily using satellite imaging, for example. This talk will present possible approaches to reconstruct the bedrock of a glacier from the knowledge of its free surface.

Contact : claude.verdier@ujf-grenoble.fr

Discipline évènement : (Physique)
Entité organisatrice : (LIPhy)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire Mat. Molle/grise)
Site de l'évènement : Domaine Universitaire de St Martin d’Hères

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