[Soft-matter] Soft Matter & Complex Systems Seminar on 17 May 2024

[Piotr Szymczak]

Dear Soft Matter & Complex Systems Colleagues and Friends, 

On Friday 17 April 2024 at 9:30 AM at the UW Faculty of Physics
(Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which 

YEVGEN MELIKHOV (IPPT PAN) 

will give a talk 

SEDIMENTATION DYNAMICS AND PHASE DIAGRAM OF ATTRACTING MODES FOR HIGHLY
DEFORMABLE FIBERS IN VISCOUS MEDIA 

ABSTRACT 

Sedimentation of elastic objects of different shapes in viscous fluids
remains an active research topic due to the importance of such phenomena
in numerous biological systems and technological processes. However,
even the sedimentation of basic objects, such as fibers or loops, can
display rich dynamics if structural flexibility is allowed. This study
presents a numerical investigation of the sedimentation of a highly
elastic fiber under gravity in a very viscous fluid. We employ the bead
model and multipole expansion of the Stokes equations, corrected for
lubrication that is implemented in the precise Hydromultipole numerical
codes. A dimensionless elasto-gravitation number B, which relates the
gravitation and bending forces acting on the fiber, and the fiber aspect
ratio N are used to describe the fiber's flexibility. The fiber
evolution is monitored over an extended period to identify the
attracting modes by systematically varying B and N in a wide range. An
analysis of the characteristic features, such as characteristic time
scales and fiber deformation patterns, of all the identified attracting
modes is presented. The created phase diagram of these modes clearly
illustrates that the existence of each mode depends not only on the
elasto-gravitation number B but also on the fiber's aspect ratio N. 

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 

Marek Trippenbach 

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