Results 1 to 10 of about 95,705 (207)

Aging and memory of transitional turbulence [PDF]

Nature Communications
The recent classification of the onset of turbulence as a directed percolation (DP) phase transition has been applied to all major shear flows including pipe, channel, Couette and boundary layer flows.
Vasudevan Mukund, Chaitanya S. Paranjape, Michael Philip Sitte, Gökhan Yalnız, Björn Hof   +4 more
doaj   +2 more sources

Turbulence and Particle Acceleration in Shearing Flows [PDF]

The Astrophysical Journal Letters, 2021
Abstract We explore constraints imposed by shear-driven instabilities on the acceleration of energetic particles in relativistic shearing flows. We show that shearing layers in large-scale AGN jets are likely to encompass a sizeable fraction (≳0.1) of the jet radius, requiring seed injection of GeV electrons for efficient acceleration ...
Frank M. Rieger, Peter Duffy
openaire   +3 more sources

Numerical Simulation of Supersonic Turbulent Separated Flows Based on k–ω Turbulence Models with Different Compressibility Corrections

Aerospace, 2023
The accurate prediction of supersonic turbulent separated flows involved in aerospace vehicles is a great challenge for current numerical simulations.
Dahai Luo
doaj   +1 more source

Nocturnal atmospheric conditions and their impact on air pollutant concentrations in the city of Stuttgart

Meteorological Applications, 2021
Meteorological and air pollutant measurements were conducted in the area of Stuttgart during winter and summer seasons. Stuttgart is situated in moderate mountainous terrain in southwestern Germany.
Olga Kiseleva, Norbert Kalthoff, Bianca Adler, Meinolf Kossmann, Andreas Wieser, Rayk Rinke   +5 more
doaj   +1 more source

Shear flow generation and energetics in electromagnetic turbulence [PDF]

Physics of Plasmas, 2005
Zonal flows are recognized to play a crucial role for magnetized plasma confinement. The genesis of these flows out of turbulent fluctuations is therefore of significant interest. Here the relative importance of zonal flow generation mechanisms via the Reynolds stress, Maxwell stress, and geodesic acoustic mode (GAM) transfer in drift-Alfvén turbulence
Naulin, V., Kendl, A., Garcia, O. E., Nielsen, A. H., Rasmussen, J. Juul   +4 more
openaire   +2 more sources

Shear Effects in Non-Homogeneous Turbulence [PDF]

, 2000
Motivated by recent experimental and numerical results, a simple unifying picture of intermittency in turbulent shear flows is suggested. Integral Structure Functions (ISF), taking into account explicitly the shear intensity, are introduced on ...
A. N. Kolmogorov, A. N. Kolmogorov, A. N. Kolmogorov, A. N. Kolmogorov, E. Gaudin, F. Chillá, F. Toschi, H. Schlichting, H. Tennekes, J. Smagorinski, M. Onorato, O. J. Hinze, R. Benzi, R. Benzi, U. Frisch   +14 more
core   +12 more sources

Large-scale instability in a sheared nonhelical turbulence: formation of vortical structures [PDF]

, 2007
We study a large-scale instability in a sheared nonhelical turbulence that causes generation of large-scale vorticity. Three types of the background large-scale flows are considered, i.e., the Couette and Poiseuille flows in a small-scale homogeneous ...
A. A. Townsend, A. D. Chernin, A. J. Chorin, A. S. Monin, G. S. Golitsyn, G. S. Golitsyn, H. J. Lugt, Igor Rogachevskii, Ilia Golubev, J. Pedlosky, L. Prandtl, L. S. Hodgson, N. Kleeorin, N. Kleeorin, Nathan Kleeorin, P. Barge, P. G. Drazin, P. H. Chavanis, P. J. E. Peebles, P. J. Schmid, S. S. Moiseev, S. S. Moiseev, Tov Elperin, W. D. McComb, W. O. Criminale, Ya. B. Zeldovich   +25 more
core   +4 more sources

Sustained turbulence and magnetic energy in nonrotating shear flows [PDF]

Physical Review E, 2017
From numerical simulations, we show that non-rotating magnetohydrodynamic shear flows are unstable to finite amplitude velocity perturbations and become turbulent, leading to the growth and sustenance of magnetic energy, including large scale fields. This supports the concept that sustained magnetic energy from turbulence is independent of the driving ...
Nauman, Farrukh, Blackman, Eric G.
openaire   +4 more sources

Impact of turbulence on aeolian particle entrainment: results from wind-tunnel experiments [PDF]

Atmospheric Chemistry and Physics, 2022
We hypothesize that large eddies play a major role in the entrainment of aeolian particles. To test this, wind-tunnel experiments are carried out to measure the particle entrainment rate for various sizes and flow conditions.
J. Zhang, J. Zhang, G. Li, G. Li, L. Shi, L. Shi, N. Huang, N. Huang, Y. Shao   +8 more
doaj   +1 more source

Investigations of hydraulic transient flows in pressurized pipeline based on 1D traditional and 3D weakly compressible models

Journal of Hydroinformatics, 2021
Transient flow characteristics and dissipation mechanism in pressurized pipeline were investigated based on 1D friction models and 3D turbulence models, where the pressure–density model was combined into the 3D continuity equation allowing for the ...
Guohong Wu, Xiangyu Duan, Jianghui Zhu, Xiaoqin Li, Xuelin Tang, Hui Gao   +5 more
doaj   +1 more source