Fluctuating immersed material (FIMAT) dynamics for the direct simulation of the brownian motion of particles

Yong Chen, Nitin Sharma, Neelesh A Patankar

Research output: Chapter in Book/Report/Conference proceedingChapter

10 Scopus citations


In the paper a Direct Numerical Simulation (DNS) scheme, named Fluctuating Immersed MATerial (FIMAT) dynamics, for the Brownian motion of particles is presented. In this approach the thermal fluctuations are included in the fluid equations via random stress terms. Solving the fluctuating hydrodynamic equations coupled with the particle equations of motion results in the Brownian motion of the particles. There is no need to add a random force term in the particle equations. The particles acquire random motion through the hydrodynamic force acting on its surface from the surrounding fluctuating fluid. The random stresses in the fluid equations are easy to calculate unlike the random terms in the conventional Brownian Dynamics (BD) type approaches.

Original languageEnglish (US)
Title of host publicationIUTAM Symposium on Computational Approaches to Multiphase Flow
Number of pages11
StatePublished - Dec 1 2006

Publication series

NameFluid Mechanics and its Applications
ISSN (Print)0926-5112


  • Brownian motion
  • Direct numerical simulation (DNS)
  • Distributed lagrange multiplier (DLM) method
  • Fluctuating hydrodynamics
  • Mesoscopic scale

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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