Results 11 to 20 of about 34,613 (317)

The minimal seed of turbulent transition in the boundary layer [PDF]

, 2011
This paper describes a scenario of transition from laminar to turbulent flow in a spatially developing boundary layer over a flat plate. The base flow is the Blasius non-parallel flow solution; it is perturbed by optimal disturbances yielding the largest
DE PALMA, Pietro, CHERUBINI, Stefania, ROBINET, Jean-Christophe, J.-C. Robinet, BOTTARO, Alessandro, A. Bottaro, J. C. Robinet, S. Cherubini, P. De Palma   +8 more
core   +1 more source

A Note on the bottom shear stress in oscillatory planetary boundary layer flow [PDF]

Modeling, Identification and Control, 1988
A simple analytical theory is presented, which describes the motion in a turbulent oscillatory planetary boundary layer near a rough seabed using a two-layer, time-invariant eddy viscosity model.
Dag Myrhaug
doaj   +1 more source

Unsteady Motion of Shock Wave for a Supersonic Compression Ramp Flow Based on Large Eddy Simulation

Frontiers in Energy Research, 2022
A large eddy simulation (LES) is conducted to investigate shock wave/turbulent boundary layer interaction in a 24° compression ramp at a high inlet Mach number of Ma=2.9.
Xing Huang, Li-Xu Wang, Dong-Dong Zhong, Ning Ge   +3 more
doaj   +1 more source

The flow structure behind vortex generators embedded in a decelerating turbulent boundary layer [PDF]

, 2009
The objective of the present work is to analyse the behaviour of a turbulent decelerating boundary layer under the effect of both passive and active jets vortex generators (VGs).
Braud, Caroline, Godard, Gilles, Cathalifaud, Patricia, Stanislas, Michel   +3 more
core   +1 more source

Spatial DNS of an Isothermal Flat Plate Supersonic Turbulent Boundary Layer with/out Impinging Shock Wave

Journal of Fluid Science and Technology, 2011
Spatial direct numerical simulation results are presented for transitional/turbulent supersonic isothermal flat plate boundary layers at M = 2.0 and impinging shock wave-boundary layer interactions.
Yusuke TOKURA, Hiroshi MAEKWA
doaj   +1 more source

Identification of Thermally-Tagged Coherent Structures in the Zero Pressure Gradient Turbulent Boundary Layer [PDF]

, 2013
A zero pressure gradient boundary layer over a flat plate is subjected to step changes in thermal condition at the wall, causing the formation of internal, heated layers.
Rought, Rebecca Lynn
core   +1 more source

Laminar-Turbulent Transition of an Inlet Boundary Layer in a Circular Pipe Induced by Periodic Injection (Shape of Isolated Turbulent Patches and Their Growth)

Journal of Fluid Science and Technology, 2013
The laminar-turbulent transition of a boundary layer induced by a jet injection in the inlet region of a circular pipe was experimentally investigated.
Masashi ICHIMIYA, Hayato MATSUDAIRA, Hayato FUJIMURA, Hideki OHNO   +3 more
doaj   +1 more source

Tracking of vortices in a turbulent boundary layer

Journal of Fluid Mechanics, 2011
AbstractThe motion of spanwise vortical elements and large-scale bulges has been tracked in the outer region between wall-normal distance $z/ \delta = 0. 11$ and 0.30 of a turbulent boundary layer at ${\mathit{Re}}_{\theta } = 2460$. The experimental dataset of time-resolved three-dimensional velocity fields used has been obtained by tomographic ...
Elsinga, Gerrit, Poelma, Christian, Schröder, Andreas, Geisler, Reinhard, Scarano, Fulvio, Westerweel, Jerry   +5 more
openaire   +6 more sources

Structure of the Turbulent Boundary Layer under Static and Dynamic Impulsive Roughness Perturbation [PDF]

, 2013
The zero-pressure gradient turbulent boundary layer at Reynolds numbers (based on momentum thickness) ranging from 2700--4100 was perturbed using an impulsively short patch of two-dimensional, spanwise roughness elements.
Jacobi, Ian
core   +1 more source

Minimalist turbulent boundary layer model [PDF]

Physical Review E, 2009
We introduce an elementary model of a turbulent boundary layer over a flat surface, given as a vertical random distribution of spanwise Lamb-Oseen vortex configurations placed over a non-slip boundary condition line. We are able to reproduce several important features of realistic flows, such as the viscous and logarithmic boundary sublayers, and the ...
openaire   +3 more sources