RT Journal Article
ID 4a8ec1c738e66943
A1 Suto, Hitoshi
A1 Hattori, Yasuo
T1 LARGE-EDDY SIMULATION OF A BUOYANT PLUME PAST A BLUFF BODY: EFFECTS OF FLOW STRUCTURES ON ENTRAINMENT CHARACTERISTICS
JF Computational Thermal Sciences: An International Journal
JO CTS
YR 2013
FD 2013-03-06
VO 5
IS 1
SP 1
OP 10
K1 buoyant plume
K1 bluff body
K1 large-eddy simulation
K1 flow structure
K1 entrainment
AB A large-eddy simulation of a buoyant plume past a bluff body (BB) is performed. The modified Rayleigh number based on the total heat input and the diameter of a BB is set at 1.2×1010. Distributions of basic statistics showed that the existence of a BB greatly varies the spatial structures of momentum and energy transport, although they gradually approached distributions corresponding to the similarity law for a fully developed plume when z/D > 2.5 (z: vertical position from a heat source, D: BB diameter) since the influence of a BB becomes weaker there. Then, the relationship between entrainment and flow structures was investigated and the entrainment coefficient was found to be locally large right above a BB owing to stationary horizontal flows and azimuthal vortices. Moreover, in the case of an insulated BB, some azimuthal vortices were formed in the process of developing a plume, 1.0 < z/D < 2.0, owing to both weak buoyancy and BB effects, and it is suggested that they are linked to the increase of entrainment there.
PB Begell House
LK https://www.dl.begellhouse.com/journals/648192910890cd0e,518df3e64719fefc,4a8ec1c738e66943.html