TY - JOUR
T1 - Numerical computations of steady and unsteady, separating, buoyant flows - Part II
T2 - Computations with a low-Reynolds-number κ-ε model
AU - Seo, E.
AU - Parameswaran, S.
N1 - Funding Information:
Recedi1v0 Maey 20; 0accep1tde16 March 20.02 This atlreiwacs prepared with the support of the U.S. Departtmof Energey (DnOE), Cooperative Agreement No. DE-5-FA3. Howe2CLver0,8any45opinion8s, ®ndins, congclu, or recsommioendationnss expressd eherein are those of the author(s) and do not necersy ires¯leact the views of the DOE. This work was conducdtthrouegh the Amarillo Ntionaal Resoue Centrcer for Plutonium. AddresscorrespondencetoDr.S.Praaswmr,aaDeeptn.ofMechnaaliEngineec ring,TexasTech University, Mail Stop. 101, 2Lubbock, TX 7904091 , 2USA-1. E-mail: sparamraoeen.ttu.eds@uwac
PY - 2002/12
Y1 - 2002/12
N2 - Numerical computation has been performed to determine the influence of buoyant effects on convective flows with the standard κ-ε and the low-Reynolds-number κ-ε models. Results obtained with both turbulent models are compared with the available experimental data. In this work, Kolmogorov velocity, uε = (vε)1/4 , is introduced instead of shear velocity, uτ = √τw/ρ, to avoid the singularity that appears at the separating and reattaching point for both turbulence models. Turbulent Prandtl numbers were allowed to vary in the low-Reynolds-number κ-ε model to mimic the experimental data. Buoyant effects have been investigated with various Richardson numbers for the backward-facing step flow. Various separation patterns as well as vortex shedding were observed beyond a critical Richardson number. In addition, the required grid configuration for accurate results for the low-Reynolds-number κ-ε model has been discussed for the backward-facing step flows.
AB - Numerical computation has been performed to determine the influence of buoyant effects on convective flows with the standard κ-ε and the low-Reynolds-number κ-ε models. Results obtained with both turbulent models are compared with the available experimental data. In this work, Kolmogorov velocity, uε = (vε)1/4 , is introduced instead of shear velocity, uτ = √τw/ρ, to avoid the singularity that appears at the separating and reattaching point for both turbulence models. Turbulent Prandtl numbers were allowed to vary in the low-Reynolds-number κ-ε model to mimic the experimental data. Buoyant effects have been investigated with various Richardson numbers for the backward-facing step flow. Various separation patterns as well as vortex shedding were observed beyond a critical Richardson number. In addition, the required grid configuration for accurate results for the low-Reynolds-number κ-ε model has been discussed for the backward-facing step flows.
UR - http://www.scopus.com/inward/record.url?scp=0036918054&partnerID=8YFLogxK
U2 - 10.1080/10407780290059828
DO - 10.1080/10407780290059828
M3 - Article
AN - SCOPUS:0036918054
VL - 42
SP - 811
EP - 832
JO - Numerical Heat Transfer; Part A: Applications
JF - Numerical Heat Transfer; Part A: Applications
SN - 1040-7782
IS - 8
ER -