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Tuesday, July 14, 2020 | History

3 edition of A distributed vortex method for computing the vortex field of a missile found in the catalog.

A distributed vortex method for computing the vortex field of a missile

Raymond L. Barger

A distributed vortex method for computing the vortex field of a missile

by Raymond L. Barger

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Published by National Aeronautics and Space Administration, Scientific and Technical Information Office, for sale by the National Technical Information Service in [Washington], Springfield, Va .
Written in English

    Subjects:
  • Vortex-motion,
  • Guided missiles,
  • Wakes (Aerodynamics)

  • Edition Notes

    StatementRaymond L. Barger
    SeriesNASA technical paper ; 1183
    ContributionsUnited States. National Aeronautics and Space Administration. Scientific and Technical Information Office
    The Physical Object
    Pagination16 p. :
    Number of Pages16
    ID Numbers
    Open LibraryOL14931999M

    Water forms a spiraling, funnel-shaped vortex as it drains from a 2-liter soda bottle. A simple connector device allows the water to drain into a second bottle. The whole assembly can then be inverted and the process repeated. Tools and Materials. Two-inch length of 1/2-inch PVC pipe, Schedule 40 (PVC pipe can be cut with a PVC cutter or hacksaw). Most of these studies used a discrete vortex method with a Trefftz plane analysis to determine the load distribution corresponding to the minimum induced drag of the configuration. The four main developers of this method are Blackwell 1, Lamar 2, Kuhlman 3, and Kroo 4. In order to provide this capability at Virginia Tech, a code wasFile Size: KB.

    The method is designed for subsonic flow and single or coupled plane, thin wings with or without vortex separation at the sharp wing edges. Potential flow effects (e.g. primary vortex) and their influence on the wing loads and the velocity field are reproduced in Cited by: 2.   The present study reports the effect of several operating parameters on the thermal performance of the vortex tube. The experimental results indicate that the inlet pressure and the cold fraction are the most significant parameters influencing the vortex tube performance. The experimental data point out that insulation has minimal effect on the vortex tube Cited by:

    approaches: vortex wake approximation with vortex filaments, vortex lattices, vortex points (vortons) of different types etc. The vortex fragmenton model for vortex wake simulation is developed by authors and it has been applied to some FSI-problems [2]. As to vorticity flux simulation, one of the most important problems is vortex sheet. – Vortex lattice method • Be able to treat swept wings – Other advanced numerical methods. Basic Concepts Design requirements stability and handling low drag high maximum lift coef. field performance maneuver requirements Aero. characteristics Aerodynamic centerFile Size: KB.


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A distributed vortex method for computing the vortex field of a missile by Raymond L. Barger Download PDF EPUB FB2

Distributed vortex method for computing the vortex field of a missile. [Washington]: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: For sale by the National Technical Information Service, This book aims to provide a comprehensive study of the mathematical theory of the vortex method, from its origins in the s, through the developments of the '70s when the use of computers made advanced research possible, to current work on Brand: Springer.

A distributed vortex method for computing the vortex field of a missile / ([Washington]: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: For sale by the National Technical Information.

A concept of the Vortex Lift of sharp edge delta wings based on a leading edge suction analogy", (). A distributed vortex method for computing the vortex field of a : Howard Smith. Keywords: Discrete Vortex Method, particle methods, Lagrangian methods, viscous ow 1 Introduction Discrete Vortex Methods (DVM’s) are Lagrangian methods for solving for rotational uid ow in which the vorticity eld is partitioned into a nite number of discrete vortex elements, and the evolution of theAuthor: O.

Tutty. NUMERICAL SIMULATION OF VORTEX BREAKDOWN BY THE VORTEX-FILAMENT METHOD Y. Nakamura, A. Leonard, and P. Spalart NASA Ames Research Center, Moffett Field, CaliforniaU.S.A.

SUMMARY The vortex-filament method was applied to the simulation of vortex breakdown. The principal vortexFile Size: 6MB. Studies of Vortex Interference Associated with Missile Configurations Daniel J. Lesieutre 1 and Omar Quijano 2 Nielsen Engineering & Research, Inc., Santa Clara, CA, Studies of vortex-induced aerodynamic nonlinearities associated with body and fin vortices for missile configurations have been performed.

Vortex Computing L.L.C. Long Beach Blvd. Suite # Lynwood, CA, [email protected] In physics, a quantum vortex represents a quantized flux circulation of some physical quantity. In most cases quantum vortices are a type of topological defect exhibited in superfluids and existence of quantum vortices was first predicted by Lars Onsager in in connection with superfluid r reasoned that quantisation of vorticity is a direct.

Key words: Vortex Method, Boundary Integral Equation, Angle Point, Non-Uniform Discretization. Cite this Article: Kseniia S. Kuzmina, Ilia K. Marchevsky and Victoria S. Moreva, On Vortex Sheet Intensity Computation For Airfoils with Angle Point In Vortex Methods, International Journal of Mechanical Engineering and Technology 9(2), pp.

Mathematical Analysis of Vortex Sheets SIJUE WU University of Michigan Abstract We consider the motion of the interface separating two domains of the same fluid that moves with different velocities along the tangential direction of the interface. The evolution of the interface (the vortex sheet) is governed by the Birkhoff-Rott (BR) equations.

In every Vortex-N, N - 1 maps to itself. If N = 2x + 1, there are no loops (Vortex-9, Vortex). If N = 3x + 1, there is a loop of length 2 (Vortex, Vortex). If there is a loop of length 2, it is always represented by a horizontal line (note that this is not necessarily true for multipliers other than 2: Vortex!).

Vortex Particle Method for Aerodynamic Analysis: Parallel Scalability and Efficiency Khaled Ibrahim*, Guido Morgenthal velocity field and the free stream velocity.

The vorticity field can be computed as superposition of the local vorticity created by each particle. Based on the Bio-Savart law the induced velocity field is. A vortex tube is the surface in the continuum formed by all vortex lines passing through a given (reducible) closed curve in the continuum.

The 'strength' of a vortex tube (also called vortex flux) is the integral of the vorticity across a cross-section of the tube, and is the same everywhere along the tube (because vorticity has zero divergence).

Studies of vortex-induced aerodynamic nonlinearities associated with body and fin vortices for missile configurations have been performed. As part of this effort, the vortex and fin modeling. Vorticity plays a key role in determining fluid flow dynamics, especially in vortex-dominated flows.

Vortex methods, which are based on the vorticity-based formulation of the Navier-Stokes equations, have provided deeper insight into physical reality in a variety of flows using vorticity as a primary variable.

The penalized vortex-in-cell (VIC) method is a state-of-the-art variant of Cited by: 3. potential-vortex, the vortex of the electric field. In addition, the experimental proof of a vortex transmission as a longitu d inal wave throu g h air or a vacuum, as accomplished.

A discrete-vortex method has been developed to model the vortex flow over a delta wing and to investigate the wing rock problem associated with highly swept wings. The method uses two logarithmic vortices placed above the wing to represent the vortex flow field, but instead of the boundary conditionsCited by: 3.

Basically, it is fitting of some velocity field described by conditions on velocity at some control points using basis functions placed in other points.

horse-shoe vortex: In order to fullfill Helmholdz theorem that vortex filaments $\Gamma$ are closed loops (does not end in the air) horse-shoe vortex is used as basis function.

Abstract This paper presents an introduction to the discrete vortex method of calculating separated flows and jet flows. A discussion of the problems associated with using this method is given and some applications of the technique are described. We study the dynamics of vortex-antivortex (VA) pairs in an infinitely thin ferromagnetic film with easy-plane anisotropy.

These are localized excitations with finite energy that are characterized by a topological (skyrmion) number N = 0,+1, Topologically trivial (N=0) VA pairs undergo Kelvin motion analogous to that encountered in fluid dynamics.

In contrast, topologically nontrivial (N Cited by: 5.As mentioned earlier, vortex pinning is extremely important in superfluid helium and superconductors.

We study vortex pinning in light to gain greater insight into the phenomena of vortex pinning in the other quantum fluids. Additionally, studying vortex pinning and tunneling is important because of its links to the ‘manipulation’ of vortices.

Vortex provides researchers with the ability to load datasets with millions of datapoints, create high quality graphs, and produce visualisations ready for presentation or publication.

In addition, Vortex can consume data from Browser, Dotmatics’ flexible data query and federation platform.