A continuum-based multiphase DNS method for studying the Brownian dynamics of soot particles in a rarefied gas
Journal article, 2019

In the mitigation of particulate matter (PM) using filters, the interplay between particle motion, geometry and flow conditions determines the overall performance. In such flows, molecular effects on the particle motion manifest as impeded momentum transfer and a meandering Brownian motion. Other particles and walls induce hydrodynamic interactions, which may further influence PM nucleation, growth and aggregation. Here, we formulate a multiphase direct numerical simulation framework to investigate these complex flows by including the molecular interactions in a consistent manner.

The basis for this framework is a coupling between the Langevin description of particle motion with a mirroring immersed boundary method. We show that the method is able to capture the diffusion dynamics of a Brownian particle, including its transition from a particle-inertia dominated, correlated ballistic regime to a non-correlated diffusive one, and that the method also can be used to reproduce the meandering motion of realistic soot particles.

Langevin dynamics



Rarefied flow

Immersed boundary method

Brownian dynamics


Ananda Subramani Kannan

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Vasilis Naserentin

Chalmers, Mathematical Sciences, Applied Mathematics and Statistics

Aristotle University of Thessaloniki

Fraunhofer-Chalmers Centre

Andreas Mark

Fraunhofer-Chalmers Centre

Dario Maggiolo

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Gaetano Sardina

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Srdjan Sasic

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Henrik Ström

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Chemical Engineering Science

0009-2509 (ISSN)

Vol. 210 115229

A continuum model for Brownian motion in rarefied gas-solid flows

Swedish Research Council (VR) (2015-04809), 2016-01-01 -- 2019-12-31.

Driving Forces

Sustainable development

Subject Categories

Energy Engineering

Chemical Engineering

Other Physics Topics

Nano Technology

Fluid Mechanics and Acoustics


Basic sciences



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