[Soft-matter] Soft Matter & Complex Systems Seminar on 14 June 2024

[Piotr Szymczak]

Dear Soft Matter & Complex Systems Colleagues and Friends,

On Friday 14 June 2024 at 9:30 AM at the UW Faculty of Physics (Pasteura 
5, Warsaw; room 1.40) we are hosting four short student presentations:

1)  Jerzy Denisiewicz

Diffusion of reciprocal swimmers

Abstract: Although scallop theorem states that in low Reynolds numbers 
swimming requires movements that are not time-reversible, in fluctuating 
fluid such a motion may cause large increase of diffusion coefficient. 
Consequently, time-reversible movements may be useful for some organisms 
despite low Reynold number.
---
The presentation will be based mainly on Eric Lauga article “Enhanced 
Diffusion by Reciprocal Swimming”


2) Norbert Nieścior

Hele-Shaw cell – a student experiment

Abstract: Hele-Shaw cell is a device for studying fluid flow in narrow 
gaps between two parallel plates. I will describe in detail the 
experimental setup designed with other students, using which we've 
performed the experiment. In the experiment, we observed Saffman-Taylor 
instability also called viscous fingering. Getting these patterns was 
the goal of our experiment and proves that our experimental setup we've 
designed worked. I will present results of the experiment show patterns 
we've got. Additionally, I will discuss potential research of the 
results of our experiment and mention existing research regarding 
Hele-Shaw cell and Saffman-Taylor instabilities.

3) Błażej Rozwoda

Mapping of two-dimensional Laplacian growths

Abstract: Laplacian growths are both simple to formulate and describing 
multiple phenomena found in the nature. In the talk I will shortly 
summarize Raphael Blumenfeld's results on description of those systems 
with Hamiltonian dynamics, including important step of conformal 
transformation.

4) Jan Turczynowicz

Marine snow growth process: study on the advective-diffusive encounter 
rate

Abstract: The main focus of the presentation is study of how the size of 
a small particles, such as bacteria, affect the encounter rate between 
them and some bigger sinking object, e.g. marine snow. I will start with 
giving a short summary of past research in this subject and show that 
considering the non-zero size of the particles is crucial in a study of 
cases when the advection is stronger than the diffusion. This is done by 
studying the asymptotics of known solutions when Peclet number is large. 
Our aim is to add consideration of radius of a particles into the 
advective-diffusive encounter rate to allow for a transition from the 
diffusion dominated to the advection dominated regime. Numerical results 
we have obtained so far show good potential and are allowing for a 
nonzero flux when Peclet number goes to infinity.



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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