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MISU guest seminar | S. Ravichandran

Numerical Simulations of Cumulus and Mammatus clouds

by S. Ravichandran, Nordita

Time: 26 February 2019, 11h15–12h00
Venue: Rossbysalen C609, Arrhenius Laboratory, 6th floor

Abstract
Clouds are fascinating fluid mechanical phenomena, encompassing length- and time-scales spanning several orders of magnitude. I will talk about ongoing work on two kinds of clouds, each more interesting than the other!

Cumulus (Latin: heap-like) clouds are tall, tower-like clouds, and are significant in the transport of energy and water vapour in the atmosphere. Their evolution is fluid-dynamical in nature, since it is governed by the rate at which the turbulent flow that makes up the cloud entrains ambient air. Entrainment is an incompletely understood phenomenon even in canonical shear flows. The study of entrainment is significantly more complicated in the transient multi-phase flows that are cumulus clouds.

Mammatus (Latin: mammary clouds) are blob-like clouds that are sometimes found hanging from cumulonimbus anvils. Their origins and dynamics are not fully understood. We propose a minimal model for these mysterious clouds, showing how their formation depends on the number and size of the water droplets they contain.


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