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SUMMARY:Lattice Boltzmann Simulations of Complex Wetting and Interfacial F
 low Dynamics  -  Prof Halim Kusumaatmaja\, University of Edinburgh\, UK
DTSTART:20251027T143000Z
DTEND:20251027T150000Z
UID:TALK239062@talks.cam.ac.uk
CONTACT:Alexander R Epstein
DESCRIPTION:In recent years the lattice Boltzmann method has increasingly 
 become a method of choice for simulating complex multiphase and interfacia
 l flows\, owing to its suitability for parallel computations and its flexi
 bility to incorporate different physical phenomena. Here\, I will illustra
 te the prowess of LBM by using two applications. First\, by coupling LBM a
 nd Discrete Element Method\, we elucidate salient mechanisms of how partic
 les can be captured and removed by liquid droplets\, which is key for desi
 gning self-cleaning surfaces. We can map out the different possible outcom
 es of the particle-droplet collision dynamics\, in good agreement compared
  to experiments\, and rationalise them by considering the competition bet
 ween capillary\, hydrodynamics\, and friction forces. We are also able to 
 identify a threshold parameter to predict particle capture. Second\, by 
 extending the LBM scheme to arbitrary N immiscible fluid components\, we c
 an explore spontaneous phase separation dynamics for up to 8 immiscible f
 luid components. In 2D (and thin 3D) systems\, droplet coalescence is stro
 ngly suppressed because of the four-colour theorem\, leading to diffusion
 -dominated coarsening dynamics that can be captured by a master scaling la
 w for N equal or larger than 4. In 3D\, the absence of four-color theore
 m (or its equivalent) means that the diffusive scaling law is only reached
  for asymptotically large N.
LOCATION:Lecture Theatre 5\, Department of Engineering\; https://zoom.us/j
 /92447982065?pwd=RkhaYkM5VTZPZ3pYSHptUXlRSkppQT09
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