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Tuesday, August 4, 2020 | History

1 edition of Trailing vortex free-surface interaction found in the catalog.

Trailing vortex free-surface interaction

Donald E. Neubert

Trailing vortex free-surface interaction

by Donald E. Neubert

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  • 9 Currently reading

Published by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


Edition Notes

Statementby Donald E. Neubert, Jr
ContributionsSarpkaya, Turgut, 1928-
The Physical Object
Pagination70 p. ;
Number of Pages70
ID Numbers
Open LibraryOL25485767M

Wingtip vortices are circular patterns of rotating air left behind a wing as it generates lift. One wingtip vortex trails from the tip of each wing. Wingtip vortices are sometimes named trailing or lift-induced vortices because they also occur at points other than at the wing tips. Indeed, vorticity is trailed at any point on the wing where the lift varies span-wise (a fact described and. The characteristics of the surface signatures resulting from the interaction of the trailing vortices with the free surface have been investigated both theoretically and experimentally. The vortices were created through the use of three lifting surfaces of different shape and aspect ratio (two Delta wings and a rectangular foil).

of constant-strength vortex elements from one or both edges of the airfoil.1,5,6,12,14 The models can be based on either discrete vortices or on vortex sheets, which, when discretized, are essentially point vortices whose interconnectivity has been maintained. As the number of vortex elements increases, their interaction. In case 4, the primary vortex (P1) is formed during a period of TE acceleration (0. 50 trailing secondary vortices (S1 and S2). Unlike the previous three cases where the primary vortices are shed during periods of TE deceleration, the primary vortex in.

The present study reveals that periodic interaction between the tip leakage vortex and the trailing edge vortex initially creates a local low pressure point about 15% blade chord downstream. As the tip leakage vortex flows downstream, it is bent and stretched by the interaction between the shed trailing edge vortex and the tip leakage vortex. BLADE-VORTEX INTERACTION NOISE CONTROLLER. SUITED FOR MINIATURE TRAILING EDGE EFFECTORS. Blade aeroelasticity. Tip transonic flows. Aerodynamic stall. of the retreating blade. Blade Vortex Interaction (BVI) • Fully nonlinear boundary conditions for the free surface.


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Trailing vortex free-surface interaction by Donald E. Neubert Download PDF EPUB FB2

Trailing vortex free-surface interaction Item Preview remove-circle Share or Embed This Item. some content may be lost due to the binding of the book. Addeddate Call number o Camera Canon EOS 5D Mark II r Sarpkaya linePages: Trailing vortex free-surface interaction.

By Jr. Donald E. Neubert. Download PDF (4 MB) Abstract. Approved for public release; distribution is unlimitedAn investigation of the interaction of a trailing vortex with a free surface has been undertaken for the purpose of understanding the origin and scars and striations.

Author: Jr. Donald E. Neubert. An investigation of the interaction of a trailing vortex with a free surface has been undertaken for the purpose of understanding the origin of scars and striations. Vortex Ring Interaction with a Free Surface M.

Song, N. Kachman, I. Kwon, L. Bernal, G. Tryggvason (The University of Michigan, USA) ABSTRACT The results of numerical and experimental studies on the interaction of vortex rings with a free surface are presented.

The trailing vortices generated by the control planes of submarines give rise to surface signatures in the form of scars and striations. Two counter-rotating vortices were generated in a novel experimental system and their interaction with the free surface Cited by: 3. Sarpkaya, T.

Trailing-vortex wakes on the free surface In Proc. 16th Symp. on Naval Hydrodynamics, Berkeley, pp. 38 –   Self-similarity of trailing vortices 28 February | Physics of Fluids, Vol. 24, No.

2 Effects of Perpendicular Blade-Vortex Interaction. Measurement and Computations of Vortex Pair Interaction with a Clean or Contaminated Free Surface A. Hirsa, G. Tryggvason, I. Abdollahi-Alibeik, W.W. Willmarth (The University of Michigan, USA) Observations of surface deformations produced by the interaction of trailing vortices with a free surface, behind a submerged delta wing at negative.

The study of vorticity interactions with a free surface is concerned with the dynamics of a vorticity field bounded by a deformable surface.

and Ohring, S. Three-dimensional vortex ring-free-surface interaction in a viscous fluid. Free surface scars and striations due to trailing vortices generated by a submerged.

The characteristics of three-dimensional flow structures (scars and striations) resulting from the interaction between a heterostrophic vortex pair in vertical ascent and a clean free surface are described. The flow features at the scar-striation interface (a constellation of whirls or coherent vortical structures) are investigated through the use of flow visualization, a motion analysis.

free surface, and Sarpkaya () gives experimental results for the interaction of trailing vortex pairs with a free surface. Such Sree-surface interactions have also been addressed computationally (e.g. Tryggvason ~). Interaction of a Fin Trailing Vortex with a Downstream Control Surface.

United States. Copy to clipboard. Beresh, Steven J, Smith, Justin, Henfling, John F., Grasser, Thomas W., and Spillers, Russell Wayne.

Tue. "Interaction of a Fin Trailing Vortex with. Briefing: Interaction of a counter-rotating vortex pair with the ground Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics, Vol.

No. 4 A consistent boundary condition for vorticity–streamfunction simulation of wall-bounded vortex flow. Approval for public release; distribution is unlimitedThe interaction of a single Lamb vortex with a free surface is analyzed numerically through the use of a finite-difference technique.

The individual effects of gravity, viscosity, and surface tension are investigated within the range of the applicability of the phenomenon and the code used. The interaction between a pair of trailing vortices and a free surface was studied.

The vortices were produced by a submerged delta wing at a negative angle of attack. In order to isolate and study the interaction, an apparatus was built to generate reproducible vortex pairs with the same Reynolds number and Froude number as the trailing vortices.

Fluid Vortices is a comprehensive, up-to-date, research-level overview covering all salient flows in which fluid vortices play a significant role. The various chapters have been written by specialists from North America, Europe and Asia, making for unsurpassed depth and breadth of coverage.

Topics addressed include fundamental vortex flows (mixing layer vortices, vortex rings, wake 3/5(2). Numerical Analysis of Hull-Propeller and Free Surface Interaction at Model-and Full-Scale. propeller unsteady force and trailing vortex transportation.

This book. This vortex sheet becomes unstable, separates, and rolls up to form a secondary vortex. The secondary vortex induces an upward motion to the primary vortex in an inviscid-like fash-ion. Boldes and Ferreri9 examined a vortex ring approaching a wall.

The ring was created by a drop of colored water impacting the free surface of a quiescent body of. Topics addressed include fundamental vortex flows (mixing layer vortices, vortex rings, wake vortices, vortex stability, etc.), industrial and environmental vortex flows (aero-propulsion system vortices, vortex-structure interaction, atmospheric vortices, computational methods with vortices, etc.), and multiphase vortex flows (free-surface.

Nikolaos D. Katopodes, in Free-Surface Flow, Abstract. Chapter 7 presents the dynamics of vorticity and its relation to turbulence. Vortex lines, tubes, sheets, and concentrated vortices are analyzed, and the fundamental vorticity theorems are formulated.

Concentrated vortex models are discussed, including the forced, free, and Rankine. At a vortex ring Reynolds number Γ/ν≈, the interaction with a contaminated free surface results in the generation of secondary and tertiary vortex rings that limited the outward motion of.Collision of a viscous, two‐dimensional vortex pair with a contaminated, free surface is studied numerically.

The Froude number is assumed to be small, so the surface remains flat. The full Navier–Stokes equations and a conservation equation for the surface contaminant are solved numerically by a finite difference method.

The shear stress at the free surface is proportional .J. R. Spreiter and A. H. Sachs, “ The rolling up of the trailing vortex sheet and its effect on the downwash behind wings,” J.

Aeronaut. Sci. 18, 21 (). Google Scholar Crossref; D, G. Dommermuth and D. K. P. Yue, “A numerical study of three-dimensional viscous interactions of vortices with a free surface,” in Ref.

4, pp. –