Title**: **Physics and mathematics behind solid-liquid impact phenomena

Speaker**: **Dr. Rouslan Krechetnikov, Department of Mathematical and Statistical Sciences, University of Alberta (http://www.math.ualberta.ca/~rkrechet/files/people/PI/index.html)

Location**: **HP 4351 (MacPhail Room) – Carleton University

Date: Friday January 26, 2024

Time: (3:30 pm – 4:30 pm)

**Abstract: **The celebrated photograph of milk drop coronet by Harold Edgerton serves as a sole source of inspiration for the work to be presented. The effort to dissect the physics underlying the coronet formation led to an ongoing journey through various, seemingly disparate, phenomena, which the author and his students have been studying both experimentally and theoretically. Among the problems to be discussed are Rayleigh-Taylor instability of curved interfaces, disintegration of a retracting soap film, rectangular plate impact on water, impulse-driven drop on a membrane, acoustic reflection and refraction at fluid interfaces, and Faraday waves on time-varying spatial domains. Via establishing a relation between these studies and the coronet problem, we will elucidate the rich multiple scale physics with a variety of mathematical approaches.

**Brief biographical sketch:** Dr. Rouslan Krechetnikov (Ph.D. 2004, Moscow Institute of Physics and Technology) is a Professor of Mathematics at the University of Alberta. Prior to joining the University of Alberta as a tenured Associate Professor, he was an Assistant Professor of Mechanical Engineering at UCSB (2009-2013), and spent a year (2007-2008) as an Assistant Professor of Mathematics at the University of Alberta (Edmonton, Canada) and a year (2006-2007) at Carleton University (Ottawa, Canada). Before that, Dr. Krechetnikov was a Postdoctoral Fellow at the California Institute of Technology (2004-2006) with Jerry Marsden and UCSB (2002-2004) with Bud Homsy.

Please contact Dr. Dave Amundsen (dave@math.carleton.ca) if you would like to set up an individual meeting with the speaker.