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UID:0-1188@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20251105T133000

DTEND;TZID=Asia/Jerusalem:20251105T143000

DTSTAMP:20251019T123915Z

URL:https://aerospace.technion.ac.il/events/a-computational-study-of-polyd
 isperse-particle-laden-turbulent-channel-flows/

SUMMARY:A Computational Study of Polydisperse Particle-laden Turbulent Chan
 nel Flows
DESCRIPTION:Lecturer:Ajay Dhankarghare\n Faculty:Department of Aerospace En
 gineering\n Institute:Technion – Israel Institute of Technology\n Locati
 on:Classroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: https:/
 /technion.zoom.us/j/93549691766\n Abstract: \n\n\nThe introduction of disp
 ersed particles into a clean flow significantly influences fluid character
 istics such as turbulent fluctuations\, mass flow rate\, and Reynolds shea
 r stress. These effects are governed by particle inertia\, mass fraction\,
  and dispersity. Conventional Lagrangian approaches\, which track individu
 al particles\, become computationally intensive for large particle numbers
 . To address this\, we propose a novel Eulerian framework for simulating p
 olydisperse particles in compressible turbulent flows. This approach resol
 ves particles as a continuum field using the quadrature-based moment metho
 d\, enabling the simulation of extremely large number of particles. By two
 -way coupling this framework with a modified low-dissipation upwind scheme
  for the gas phase\, we perform Direct Numerical Simulations of turbulent 
 particle-laden channel flows at moderate Reynolds numbers.\n\nOur simulati
 ons consider different Stokes numbers\, particle mass fractions\, and disp
 erities. The results show that the method accurately captures key flow phe
 nomena\, including turbulent statistics\, kinetic energy\, skin friction d
 rag\, turbophoresis\, interphase momentum exchange\, and particle mass tra
 nsport. In the near-wall region\, particles tend to cluster in low-speed s
 treaks\, thereby organizing and modulating fluid turbulence. We further ex
 tend the framework by introducing a small fraction of secondary particles 
 with different inertia into a monodisperse system. We show that this bidis
 perse distribution of particles alters the turbulence near the wall but ha
 s a negligible impact in the channel core. This is attributed to different
 ial particle migration rates along the channel height. Finally\, the frame
 work is extended to simulate heat transfer between the fluid and dispersed
  phases\, demonstrating its broad applicability for multiphase turbulent f
 lows.\n\n\n\n Details: \n 
CATEGORIES:Seminars,סמינרים
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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