[Soft-matter] Soft Matter & Complex Systems Seminar on 16 Jan 2026

[Maciej Lisicki]

Dear Soft Matter & Complex Systems Colleagues and Friends,

On Friday 16 January 2026 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar, during which 

Piotr Zdybel (IPPT PAN)

will give a talk
Three-Dimensional Buckling of Slender Filaments in Shear Flow

Abstract

We study the onset of 3D buckling of a slender elastic filament in a viscous shear flow at low Reynolds number and high Péclet number. Using the Euler–Bernoulli (elastica) description linearized about a straight configuration of arbitrary orientation, we show that the 3D stability problem can be reduced to a universal spectral problem governed by an orientation-dependent combination of the elastoviscous number and the shear geometry. Building on earlier in-plane eigenmodes, we solve the 3D eigenproblem and propose a simple analytic approximation of the unstable eigenfunctions as Gaussian wave packets. This yields the central scaling result: for highly flexible filaments, the characteristic wavenumber of the most unstable mode grows proportionally to the square root of this elastoviscous measure. Finally, we validate the predicted eigenshapes by numerical simulations of finite-thickness filaments using a bead model and the HYDROMULTIPOLE codes. The talk is based on our paper: P. Sznajder, P. Zdybel, L. Liu, and M. L. Ekiel-Jeżewska, Phys. Rev. E 110, 025104 (2024).

We warmly welcome everyone to attend the talk and the Soft Matter Coffee Break after the seminar, held in room 2.63 (2nd floor).

Maria Ekiel-Jeżewska
Maciej Lisicki
Piotr Szymczak
Panagiotis Theodorakis

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