TY - JOUR

T1 - Numerical computations of steady and unsteady, separating, buoyant flows - Part 1

T2 - Computations with the standard κ-ε model

AU - Seo, E.

AU - Parameswaran, S.

N1 - Funding Information:
Receievd 10 May 20;0acc1eptde16 Mrh c20a. 02 This paper was prepared with the support of the U.S. Departntmof Energey (DOE), Cooperative AgrmeenteNo. DE-FC0A485-3L58. Howe2ve, arny opinions, ®ndings, conclusions, or recommendations expserdsheerein are those of the author(s) and do not necersy irse¯leact the views of the DOE. This work was conductdethrough the Amarillo National Resource Center for Plutonium. Address correspondene tocDr. S. Paasmwra,aDeneptr. of Mechanical Engineer, Texains Tecgh Unievrs,iMtilyStopa12,0Lu1bboc, TXk79942-0, 1US1A0. E-mail: spmsarwern@coaaae.ttu.edu

PY - 2002/12

Y1 - 2002/12

N2 - A numerical investigation has been performed to determine qualitatively the influence of the buoyant effect on the mixed convection. The standard κ-ε model with standard wall functions is used to predict buoyancy flows through a backward-facing step for various Richardson numbers. The eddy-diffusivity concept is used in modeling for the buoyant term. The momentum equation for the velocity field and the energy equation for the temperature field are solved simultaneously because of strong coupling between temperature and velocity. The reattachment lengths for laminar and turbulent flows are calculated and the Nusselt numbers and drag coefficients are examined for each case. Various separation patterns as well as vortex shedding are observed after a critical Richardson number. A numerical solution showed that the buoyant-induced vortex shedding enhanced the heat transfer.

AB - A numerical investigation has been performed to determine qualitatively the influence of the buoyant effect on the mixed convection. The standard κ-ε model with standard wall functions is used to predict buoyancy flows through a backward-facing step for various Richardson numbers. The eddy-diffusivity concept is used in modeling for the buoyant term. The momentum equation for the velocity field and the energy equation for the temperature field are solved simultaneously because of strong coupling between temperature and velocity. The reattachment lengths for laminar and turbulent flows are calculated and the Nusselt numbers and drag coefficients are examined for each case. Various separation patterns as well as vortex shedding are observed after a critical Richardson number. A numerical solution showed that the buoyant-induced vortex shedding enhanced the heat transfer.

UR - http://www.scopus.com/inward/record.url?scp=0036912139&partnerID=8YFLogxK

U2 - 10.1080/10407780290059819

DO - 10.1080/10407780290059819

M3 - Article

AN - SCOPUS:0036912139

VL - 42

SP - 791

EP - 809

JO - Numerical Heat Transfer; Part A: Applications

JF - Numerical Heat Transfer; Part A: Applications

SN - 1040-7782

IS - 8

ER -