Results 241 to 250 of about 9,758,243 (289)

On the structure of turbulent channel flow

Journal of Fluid Mechanics, 1982
Hot-film measurements of the streamwise velocity component were carried out in a fully developed turbulent water-channel flow for three different Reynolds numbers (13800, 34600 and 48900). The results for the first four statistical moments complement and extend the results from previous studies of turbulent channel flow. The VITA variance technique waa
Arne V. Johansson, P. Henrik Alfredsson
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Turbulent Structures in Canopy Flows

2014
A wind-tunnel experiment has been performed by means of a new forest canopy model. Hot-wire anemometry and Particle Image Velocimetry have been used to describe the flow from the statistical point of view together with a conditional sampling approach based on the Variable Interval Time Average method.
Antonio Segalini, Jens H. M. Fransson, P. Henrik Alfredsson   +2 more
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The Structure of Turbulent Flows

2019
Structural properties of turbulent flows are introduced and classified in the present chapter. They have been the subject of experimental and theoretical research for a long time, see the proceedings of the IUTAM symposium in Cambridge U.K. 1989 [1] for the topological and geometric aspects of flow structures.
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The Structure of Turbulent Flows

1977
Figure 22.1 shows four photographs of a turbulent boundary layer. Hydrogen bubble markers were released in small squares (as described in Section 23.4) from a fine wire parallel to the wall and perpendicular to the mean flow. The different pictures were taken with the wire at different distances from the wall, ranging from close to the wall to close to
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The Structure of Turbulence of a Corner Flow

1983
The present work was initiated in order to study the mechanism of turbulent contamination or the spread of turbulence into the boundary layer from the corner. Hot-wire measurements together with the flow visualization by smoke show that the turbulence in the corner flow is characterized by the streamwise vortices aligned along the surface and that it ...
Y. Kobashi, O. Mochizuki, K. Ogawara
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Turbulence Structure of Mixing Swirling Flows.

1987
Abstract : This study is an experimental investigation of a swirling inner flow which develops along a constant-diameter centerbody in the presence of an unconfined, axially-directed outer flow. The data which have been acquired include local mean velocity and static pressure profiles at six streamwise locations for different prescribed mass flow rate ...
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Coherent structures in turbulent flows

Progress in Aerospace Sciences, 1988
Abstract Coherent structures—loosely defined as regions of concentrated vorticity, characteristic and flow-specific organization, recurrence, appreciable lifetime and scale—have been the foremost object of scientific curiosity and dispute in turbulence research for more than ten years past.
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Turbulent Flow in the Micro Structures of Porous Media

ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels, 2015
Some fundamental issues with respect to turbulent flows through a porous matrix are addressed by analyzing DNS results (DNS: direct numerical simulation, i.e. no turbulence modeling). In a porous matrix with pore sizes of micro or even nano dimensions turbulent flow may occur when the (local) Reynolds number is sufficiently large.
Herwig, Heinz, Jin, Yan, Uth, Marc-Florian, Kuznetsov, Andrey V.   +3 more
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Structure of turbulent flows of incompressible fluids and the parametrization of turbulence

Journal of Experimental and Theoretical Physics, 1999
The structure of stationary isotropic, homogeneous turbulence in an incompressible fluid with Re ≫ 1 set into motion by a force with amplitude f 0 and spatial and temporal time scales of r 0 and τ 0, respectively, is examined. It is found that, depending on the magnitude of the force that sets the fluid into motion, three fundamentally different ...
S. N. Gordienko, S. S. Moiseev
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Flow Structure of Swirling Turbulent Propane Flames

Flow, Turbulence and Combustion, 2011
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Alekseenko, Sergey V., Dulin, Vladimir M., Kozorezov, Yuriy S., Markovich, Dmitriy M., Shtork, Sergey I., Tokarev, Mikhail P.   +5 more
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