ISTerre seminar

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Lagrangian diffusion in non homogeneous non isotropic turbulence

Tuesday 27 May 2025 - 11h00

Romain Volk - Ecole Normale Supérieure de Lyon, Laboratoire de Physique
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When particles are released from a localized source in a turbulent flow, they disperse due to flow fluctuations with a spreading rate dictated by the velocity variance and its Lagrangian timescale. This problem of Taylor diffusion is complex in a non homogeneous flow as all properties evolve with the distance to the source. We focus here to the situation of tracer particles released from the centre of a von Karman flow and investigate the non-stationary Lagrangian dynamics associated to the Eulerian inhomogeneity and anistropy. We will then analyze how small scales are affected by the large scale anisotropy of the flow and explain how the hierachy of timescales can be understood knowing the large scale properties of the flow.

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Organizing team : Géodynamo

Salle Dolomieu, Maison des Géosciences, 38400 Saint Martin d'Hères

Informations de visio :

https://univ-grenoble-alpes-fr.zoom.us/j/91690538748?pwd=buNDS0rAZw9rG4vS1rWxX53zHYdQaw.1