BEGIN:VCALENDAR
VERSION:2.0
PRODID:www.dresden-science-calendar.de
METHOD:PUBLISH
CALSCALE:GREGORIAN
X-MICROSOFT-CALSCALE:GREGORIAN
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VTIMEZONE
TZID:Europe/Berlin
X-LIC-LOCATION:Europe/Berlin
BEGIN:DAYLIGHT
TZNAME:CEST
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
DTSTART:19810329T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
DTSTART:19961027T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:DSC-12527
DTSTART;TZID=Europe/Berlin:20170216T150000
SEQUENCE:1487230880
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20170216T160000
URL:https://dresden-science-calendar.de/calendar/en/detail/12527
LOCATION:TUD\,    
SUMMARY:Ihle: Kinetic theory of active matter: coarse-graining and invasion
  waves
CLASS:PUBLIC
DESCRIPTION:Speaker: Thomas Ihle\nInstitute of Speaker: Ernst-Moritz-Arndt 
 University Greifswald\, Institute for Physics\nTopics:\nPhysik\, Informati
 k\n Location:\n  Name: TUD (Willersbau A317)\n  Street:   \n  City:  \n  P
 hone: \n  Fax: \nDescription: Models of self-driven agents similar to the 
 Vicsek model are studied by means of kinetic theory. In these models\, par
 ticles try to align their travel directions with the average direction of 
 their neighbors plus some noise. At low noise\, a globally ordered state o
 f collective motion forms. These models have a discrete time step\, consis
 t of a simple streaming and collision step and are easily implemented on a
  computer.<br /> A kinetic theory is derived from an exact equation for th
 e N-particle probability density using Boltzmann’s approximation of Mole
 cular Chaos. A coarse-graining procedure\, called Chapman-Enskog expansion
  is performed to derive hydrodynamic equations from the kinetic theory.<br
  /> The kinetic theory is also solved numerically by a Lattice-Boltzmann-l
 ike algorithm. Steep soliton-like waves are observed that lead to an abrup
 t jump of the global order parameter if the noise level is changed. The sh
 ape of the waves is shown to quantitatively agree within 3% with agent-bas
 ed simulations at large particle speeds. At small densities and realistic 
 particle speeds\, the mean-field assumption of Molecular<br /> Chaos is in
 valid near the onset of collective motion\, and correlation and memory eff
 ects become relevant.<br /> I will show how to self-consistently include c
 orrelation effects at the level of ring-kinetic theory. Instead of just on
 e kinetic equation\, an additional equation for the time evolution of the 
 two-particle correlations will be derived. This equation is solved numeric
 ally for a homogeneous system and shown to be in excellent agreement with 
 agent-based simulations in certain parameter ranges.<br /> Thomas Ihle stu
 dierte Physik an der Universität Leipzig\, wechselte 1991 als Diplomand a
 n das Forschungszentrum Jülich und promovierte 1996 an der RWTH Aachen. N
 ach Postdoc-Aufenthalten in Paris\, Grenoble\, Minneapolis und Stuttgart w
 urde Prof. Ihle 2004 an die North Dakota State University berufen\, wo er 
 2010 Tenure erhielt. 2015 erfolgte die Ernennung zum Professor an der Erns
 t-Moritz-Arndt Universität Greifswald. Hauptarbeitsgebiete sind kinetisch
 e Theorie und Computersimulation selbstgetriebener Teilchen\, Entwicklung 
 teilchenbasierter Algorithmen für komplexe Flüssigkeiten sowie Musterbil
 dung beim Kristallwachstum.
DTSTAMP:20260508T122222Z
CREATED:20170215T074056Z
LAST-MODIFIED:20170216T074120Z
END:VEVENT
END:VCALENDAR