RT Book, Section
T1 Coherent structures in marginally turbulent square duct flow
A1 Uhlmann, Markus
A1 Pinelli, Alfredo
A1 Sekimoto, Atshushi
A1 Kawahara, Genta
A2 Kaneda, Yukio
AB Direct numerical simulation of fully developed turbulent flow in a straight square duct was performed in order to determine the minimal requirements for self-sustaining turbulence. It was found that turbulence can be maintained for values of the bulk Reynolds number above approximately 1100, corresponding to a friction-velocity-based Reynolds number of 80. The minimum value for the streamwise period of the computational domain measures around 190 wall units, roughly independently of the Reynolds number. Furthermore, we present a characterization of the marginal state, where coherent structures are found to have significant relevance to the appearance of secondary flow of Prandtl’s second kind.
PB Springer
SN 978-1-4020-6471-5
YR 2008
FD 2008
LK https://hdl.handle.net/20.500.14352/53265
UL https://hdl.handle.net/20.500.14352/53265
NO Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence, Nagoya University, Nagoya, Japan, September, 11-14, 2006
DS Docta Complutense
RD 9 abr 2025