An algebraic closure model for the DNS of turbulent drag reduction by Brownian microfiber additives in a channel flow

Amin Moosaie, Niloufar Shekouhi, N. M. Nouri, Michael Manhart

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

An algebraic closure for the non-Newtonian Navier-Stokes equations is presented which accounts for the effect of a dilute suspension of Brownian fibers. The model is intended to be used in simulations of turbulent drag reduction by Brownian fiber additives. It is based on a blending between an existing algebraic model for non-Brownian fibers and an analytical result for strongly Brownian fibers. Two-way coupled simulations of turbulent drag reduction in a channel flow demonstrate that the model predicts flow statistics that are in very good agreement with those obtained by the direct Monte-Carlo approach. Using the proposed model, the cost of simulating a drag-reduced flow in terms of CPU-time is slightly more than that of a Newtonian flow.

Original languageEnglish
Pages (from-to)60-66
Number of pages7
JournalJournal of Non-Newtonian Fluid Mechanics
Volume226
DOIs
StatePublished - 1 Dec 2015

Keywords

  • Algebraic closure model
  • Brownian fiber suspension
  • Channel flow
  • Direct numerical simulation
  • Turbulent drag reduction

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