Results 221 to 230 of about 18,315 (267)
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The Structure of Turbulent Flows
1977Figure 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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On the structure of turbulent channel flow
Journal of Fluid Mechanics, 1982Hot-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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Turbulence Structure of Mixing Swirling Flows.
1987Abstract : 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, 1988Abstract 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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Structure of turbulent flows of incompressible fluids and the parametrization of turbulence
Journal of Experimental and Theoretical Physics, 1999The 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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The Structure of Turbulence of a Corner Flow
1983The 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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Structurally nonlinear fluttering airfoil in turbulent flow
AIAA Journal, 2001The dynamics and response of a structurally nonlinear two-dimensional airfoil in turbulent flow are investigated numerically. The solution is analyzed in terms of probability density function (PDF), response mean square, power spectral density, and Lyapunov exponent. Both the longitudinal and vertical components of turbulence are considered.
Dominique C. Poirel, Stuart J. Price
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Turbulent Flow in the Micro Structures of Porous Media
ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels, 2015Some 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 +3 more
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Tracking space-filling structures in turbulent flows
2015 IEEE 5th Symposium on Large Data Analysis and Visualization (LDAV), 2015We present a novel approach for tracking space-filling features, i.e. a set of features which covers the entire domain. In contrast to previous work, we determine the assignment between features from successive time steps by computing a globally optimal, maximum-weight, maximal matching on a weighted, bi-partite graph.
Andrea Schnorr +3 more
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Entrainment and the structure of turbulent flow
Journal of Fluid Mechanics, 1970Although the entrainment of non-turbulent fluid into a turbulent flow occurs across sharply defined boundaries, its rate is not determined solely by the turbulent motion adjacent to the interface but depends on overall properties of the flow, in particular, on those that control the energy balance.
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