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Transition to turbulence in shear flows [PDF]
Physica A: Statistical Mechanics and Its Applications, 2018 Pipe flow and many other shear flows show a transition to turbulence at flow rates for which the laminar profile is stable against infinitesimal perturbations. In this brief review the recent progress in the understanding of this transition will be summarized, with a focus on the linear and nonlinear states that drive the transitions, the extended and ...
Bruno Eckhardt
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The lift-up effect: The linear mechanism behind transition and turbulence in shear flows [PDF]
European Journal of Mechanics, B/Fluids, 2014 The formation and amplification of streamwise velocity perturbations induced by cross-stream disturbances is ubiquitous in shear flows. This disturbance growth mechanism, so neatly identified by Ellingsen and Palm in 1975, is a key process in transition ...
Luca Brandt
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Direct numerical simulation of statistically stationary and homogeneous shear turbulence and its relation to other shear flows [PDF]
Physics of Fluids, 2016 Statistically stationary and homogeneous shear turbulence (SS-HST) is investigated by means of a new direct numerical simulation code, spectral in the two horizontal directions and compact-finite-differences in the direction of the shear. No remeshing is
Atsushi Sekimoto +2 more
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Patterns in Wall-Bounded Shear Flows
Annual Review of Fluid Mechanics, 2020 Experiments and numerical simulations have shown that turbulence in transitional wall-bounded shear flows frequently takes the form of long oblique bands if the domains are sufficiently large to accommodate them.
Laurette Tuckerman +2 more
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On negative turbulence production phenomena in the shear layer of separating and reattaching flows
Physics Letters, Section A: General, Atomic and Solid State Physics, 2019 The analysis of Direct Numerical Simulation data of the separating and reattaching flow over a blunt bluff body with sharp edges, reveals the presence of negative turbulence production mechanisms in the leading-edge shear layer.
Andrea Cimarelli +2 more
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Aging and memory of transitional turbulence [PDF]
Nature CommunicationsThe 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 +4 more
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Finite lifetime of turbulence in shear flows
Nature, 2006 Generally, the motion of fluids is smooth and laminar at low speeds but becomes highly disordered and turbulent as the velocity increases. The transition from laminar to turbulent flow can involve a sequence of instabilities in which the system realizes progressively more complicated states, or it can occur suddenly. Once the transition has taken place,
Hof, Bjorn +4 more
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AN IMPROVED TURBULENCE MODEL FOR ROTATING SHEAR FLOWS
Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena, 2001 In the present study, we construct a turbulence model based on a low-Reynolds-number non-linear k–ϵ model for turbulent flows in a rotating channel. Two-equation models, in particular the non-linear k–ϵ model, are very effective for solving various flow problems encountered in technological applications.
HATTORI, Hirofumi, NAGANO, Yasutaka
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Development of turbulence models for shear flows by a double expansion technique
Physics of Fluids A, Fluid Dynamics, 1992 Thangam S, Gatski T B, Speziale C G
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Data-driven turbulence modeling in separated flows considering physical mechanism analysis [PDF]
International Journal of Heat and Fluid Flow, 2021 Accurate simulation of turbulent flow with separation is an important but challenging problem. In this paper, a data-driven Reynolds-averaged turbulence modeling approach, field inversion and machine learning is implemented to modify the Spalart–Allmaras
Chongyang Yan +3 more
semanticscholar +1 more source