TY - GEN
T1 - Near-wall turbulence in a localized puff in a pipe
AU - Yakhot, Alexander
AU - Feldman, Yuri
AU - Moxey, David
AU - Sherwin, Spencer
AU - Karniadakis, George Em
N1 - Publisher Copyright:
© Springer Nature Switzerland AG 2019.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - We have performed direct numerical simulations of a transitional flow in a pipe for Rem=2250 when turbulence manifests in the form of fleshes (puffs). From experiments and simulations, Rem ≈ 2250 has been estimated as a threshold when the average speeds of upstream and downstream fronts of a puff are identical (Song et al. in J Fluid Mech 813:283–304, 2017, [1]). The flow regime upstream of its trailing edge and downstream of its leading edge is almost laminar. To collect the velocity data, at each time instance, we followed a turbulent puff by a three-dimensional moving window centered at the location of the maximum energy of the transverse (turbulent) motion. In the near-wall region, despite the low Reynolds number, the turbulence statistics, in particular, the distribution of turbulence intensities and Reynolds shear stress becomes similar to a fully-developed turbulent pipe flow.
AB - We have performed direct numerical simulations of a transitional flow in a pipe for Rem=2250 when turbulence manifests in the form of fleshes (puffs). From experiments and simulations, Rem ≈ 2250 has been estimated as a threshold when the average speeds of upstream and downstream fronts of a puff are identical (Song et al. in J Fluid Mech 813:283–304, 2017, [1]). The flow regime upstream of its trailing edge and downstream of its leading edge is almost laminar. To collect the velocity data, at each time instance, we followed a turbulent puff by a three-dimensional moving window centered at the location of the maximum energy of the transverse (turbulent) motion. In the near-wall region, despite the low Reynolds number, the turbulence statistics, in particular, the distribution of turbulence intensities and Reynolds shear stress becomes similar to a fully-developed turbulent pipe flow.
UR - http://www.scopus.com/inward/record.url?scp=85072825002&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-22196-6_3
DO - 10.1007/978-3-030-22196-6_3
M3 - Conference contribution
AN - SCOPUS:85072825002
SN - 9783030221959
T3 - Springer Proceedings in Physics
SP - 15
EP - 20
BT - Progress in Turbulence VIII - Proceedings of the iTi Conference in Turbulence 2018
A2 - Örlü, Ramis
A2 - Talamelli, Alessandro
A2 - Peinke, Joachim
A2 - Oberlack, Martin
PB - Springer Science and Business Media, LLC
T2 - 8th iTi Conference on Turbulence, 2018
Y2 - 3 September 2018 through 7 September 2018
ER -