TY - JOUR
T1 - An algebraic closure model for the DNS of turbulent drag reduction by Brownian microfiber additives in a channel flow
AU - Moosaie, Amin
AU - Shekouhi, Niloufar
AU - Nouri, N. M.
AU - Manhart, Michael
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - 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.
AB - 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.
KW - Algebraic closure model
KW - Brownian fiber suspension
KW - Channel flow
KW - Direct numerical simulation
KW - Turbulent drag reduction
UR - http://www.scopus.com/inward/record.url?scp=84946915768&partnerID=8YFLogxK
U2 - 10.1016/j.jnnfm.2015.10.005
DO - 10.1016/j.jnnfm.2015.10.005
M3 - Article
AN - SCOPUS:84946915768
SN - 0377-0257
VL - 226
SP - 60
EP - 66
JO - Journal of Non-Newtonian Fluid Mechanics
JF - Journal of Non-Newtonian Fluid Mechanics
ER -