Three Dimensional Vortex Interactions In Turbulent Boundary Layers PDF Download
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Author | : C. R. Smith |
Publisher | : |
Total Pages | : 99 |
Release | : 1985 |
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Download Three-Dimensional Vortex Interactions in Turbulent Boundary Layers Book in PDF, ePub and Kindle
A combined analytical experimental program, which has as its continuing objective the detailed investigation of the three dimensional vortex interactions which take place in turbulent boundary layers, is described and the accomplishments detailed. The analytical and numerical studies have examined both the development and characteristics of loop and hairpin vortices in both uniform and shear flows; particular attention has been paid to the strong three dimensional, inviscid viscous interaction of these types of vortical flow structures with wall region fluid. The experimental studies have focussed on the creation & detailed examination of three dimensional hairpin vortices, developing flow visualization patterns for cross-comparison with both the analytical studies and fully turbulent boundary layer flows. A technique for developing quantitative data by image processing of the visualization patterns is also described. Keywords: Turbulent boundary layer; Coherent structure; Flow visualization; Numerical modelling; Vortex wall interactions; Computer aided analysis; Loop vortices; Hairpin vortices.
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Release | : 1969 |
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Download Legislazione e controllo igienico del latte in Svizzera Book in PDF, ePub and Kindle
Author | : Jeffrey S. Marshall |
Publisher | : |
Total Pages | : 50 |
Release | : 1999 |
Genre | : Fluid dynamics |
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Download Three-dimensional Vortex-body Interaction in a Viscous Fluid Book in PDF, ePub and Kindle
An experimental and computational study of the impact of a vortex with a body oriented normal to the vortex axis was performed. Particular focus was placed on understanding characteristics of the secondary vorticity ejected from the body and the interaction of the secondary vorticity with the primary vortex. Since both onset of boundary layer separation and the form of the secondary vorticity structures are sensitive to variation of the velocity normal to the body axis, the effect of normal velocity on vortex-body interaction was carefully examined. The physical features of the flow evolution were categorized in terms of an impact parameter and a thickness parameter, which respectively represent ratios of velocity and length scales associated with the vortex to those associated with the flow in the absence of the vortex. Experiments were performed using a combination of laser-induced fluorescence (LIF) flow visualization and particle-image velocimetry (PIV) in a water tank to examine the form of the secondary vorticity structures with both "high" and "low" values of the impact parameter for normal vortex interaction with a circular cylinder and with a thin blade. A new type of Lagrangian vorticity method based on a tetrahedral mesh was developed and applied to compute the secondary vorticity evolution during vortex-cylinder interaction. Computations were also performed for model problems to examine in detail wrapping of a vortex loop around a columnar vortex and impulsive cutting of a columnar vortex with finite axial flow.
Author | : O. Sendstad |
Publisher | : |
Total Pages | : 130 |
Release | : 1992 |
Genre | : Simulation methods |
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Download Three-dimensional Turbulent Boundary Layers Book in PDF, ePub and Kindle
Author | : Stanford University. Thermosciences Division. Thermosciences Division |
Publisher | : |
Total Pages | : 170 |
Release | : 1990 |
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Download Interaction of an Embedded Longitudinal Vortex with an Attached, Three-dimensional, Turbulent Boundary Layer Book in PDF, ePub and Kindle
Author | : J. P. Johnston |
Publisher | : |
Total Pages | : 62 |
Release | : 1976 |
Genre | : Boundary layer |
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Download Experimental Studies in Three-dimensional Turbulent Boundary Layers Book in PDF, ePub and Kindle
The various methods for measurement of the six components of the turbulence stress tensor are reviewed, and some of the data on the turbulent shear stress vector are presented to demonstrate the validity of current ideas for.
Author | : |
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Total Pages | : 52 |
Release | : 1987 |
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Download Interaction Between a Vortex and a Turbulent Boundary Layer. Part 1: Mean Flow Evolution and Turbulence Properties Book in PDF, ePub and Kindle
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Total Pages | : 226 |
Release | : 1990 |
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Download Two- and Three-dimensional Blade Vortex Interactions Book in PDF, ePub and Kindle
Author | : Dominic A. R. Davis |
Publisher | : |
Total Pages | : 30 |
Release | : 1993 |
Genre | : Eddies |
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Download On Nonlinear Tollmien-Schlichting/vortex Interaction in Three Dimensional Boundary Layers Book in PDF, ePub and Kindle
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Total Pages | : 16 |
Release | : 1991 |
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Download A Study of Three Dimensional Turbulent Boundary Layer Separation and Vortex Flow Control Using the Reduced Navier Stokes Equations Book in PDF, ePub and Kindle