RT Book, Section
T1 Buoyancy effects on low-Reynolds-number turbulent flow in a horizontal square duct
A1 Sekimoto, Atshushi
A1 Sekiyama, K.
A1 Kawahara, Genta
A1 Uhlmann, Markus
A1 Pinelli, Alfredo
AB Direct numerical simulations of fully developed low-Reynolds-number turbulent flow in a horizontal square duct heated from below are performed at Richardson numbers 0 ≤ Ri ≤ 1.03 to investigate the buoyancy effects on the coherent structures near the walls, i.e. streamwise vortices and associated streaks, and on turbulence-driven secondary flow of Prandtl's second kind. It is found that cross-streamwise thermal convection which is represented by single large-scale circulation appears to affect the coherent structures and the mean secondary flow for Ri ≥ 0.02. As Ri is increased, the nearwall coherent structures are observed to appear more frequently in the region near one of the two corners on the wall, since they are swept along the wall towards the corner by the large-scale convection. The localization of the near-wall structures affects the profile of skin friction and heat transfer rate on the wall.
PB Begell House
YR 2009
FD 2009
LK https://hdl.handle.net/20.500.14352/53264
UL https://hdl.handle.net/20.500.14352/53264
DS Docta Complutense
RD 29 abr 2024