3 edition of **Nonlinear axisymmetric and three-dimensional vorticity dynamics in a swirling jet model** found in the catalog.

Nonlinear axisymmetric and three-dimensional vorticity dynamics in a swirling jet model

- 222 Want to read
- 33 Currently reading

Published
**1996** by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, VA, [Springfield, Va .

Written in English

- Vorticity.,
- Aircraft models.,
- Three dimensional motion.,
- Swirling.,
- Computational fluid dynamics.

**Edition Notes**

Other titles | Nonlinear axisymmetric and three dimensional vorticity dynamics in a swirling jet model. |

Statement | J.E. Martin, E. Meiburg. |

Series | ICASE report -- no. 96-41., NASA contractor report -- 198343., NASA contractor report -- NASA CR-198343. |

Contributions | Meiburg, E., Institute for Computer Applications in Science and Engineering. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL15504912M |

We report recent studies have clearly shown the important role of swirl fluctuations (or, more precisely, fluctuations in axial vorticity) in the response of premixed flames to flow oscillations. An important implication of this mechanism is that the axial location of the swirler plays a key role in. Three-dimensional instability and state selection in an oscillatory axisymmetric swirling ﬂow H. M. Blackburna) CSIRO Manufacturing and Infrastructure Technology, P.O. Highett , Australia that they arise as a result of inﬂectional instability of the swirling wall-jet . The Nonlinear Evolution of Vortex Sheets with Surface Tension in Axisymmetric Flows Qing Nie Department of Mathematics, University of California at Irvine, Irvine, California E-mail: [email protected] Received Ma ; revised August 3, The presence of surface tension for interfacial ﬂows usually leads to severe stabil-.

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The mechanisms of vorticity concentration, reorientation, and stretching are investigated in a simplified swirling jet model, consisting of a line vortex along the jet axis surrounded by a jet shear layer with both azimuthal and streamwise vorticity.

Inviscid three‐dimensional vortex dynamics simulations demonstrate the nonlinear interaction and competition between a centrifugal instability and Kelvin–Helmholtz instabilities feeding on both components of the base flow by: Inviscid three-dimensional vortex dynamics simulations demonstrate the nonlinear interaction and competition between a centrifugal instability and Kelvin–Helmholtz instabilities feeding on both components of the base ﬂow vorticity.

Under axisymmetric ﬂow conditions, it is found that the swirl leads to the emergence of counter-rotating. The mechanisms of vorticity concentration, reorientation, and stretching are investigated in a simplified swirling jet model, consisting of a line vortex along the jet axis surrounded by a jet shear layer with both azimuthal and streamwise vorticity.

Inviscid three-dimensional vortex dynamics simulations demonstrate the nonlinear interaction and competition between a centrifugal instability and Kelvin-Helmholtz instabilities feeding on both components of the base flow vorticity. simpliﬁed swirling jet model, consisting of a line vortex along the jet axis surrounded by a jet shear layer with both azimuthal and streamwise vorticity.

Inviscid three-dimensional vortex dynamics. The mechanisms of vorticity concentration, reorientation, and stretching are investigated in a simpli ed swirling jet model, consisting of a line vortex along the jet axis surrounded by a jet shear layer with both azimuthal and streamwise vorticity.

Inviscid three-dimensional vortex dynamics simulations demonstrate the nonlinear interaction and competition between a centrifugal instability and Kelvin-Helmholtz instabilities feeding on both components of the base ow vorticity. Inviscid three-dimensional vortex dynamics simulations demonstrate the nonlinear interaction and competition between a centrifugal instability and Kelvin-Helmholtz instabilities feeding on both components of the base flow vorticity.

Under axisymmetric flow conditions, it is found that the swirl leads to the emergence of connterrotating. Inviscid three-dimensional vortex dynamics simulations demonstrate the nonlinear interaction and competition between a centrifugal instability and Kelvin-Helmholtz instabilities feeding on both components of the base flow vorticity.

Under axisymmetric flow conditions, it is found that the swirl leads to the emergence of counterrotating vortex rings, whose circulation, in the absence of viscosity Author: E. Meiburg and J. Martin. Inviscid three-dimensional vortex dynamics simulations demonstrate the nonlinear interaction and competition between a centrifugal instability and Kelvin-Helmholtz instabilities feeding on both components of the base ow vorticity.

Under axisymmetric ow conditions, it is found that the swirl leads to the emergence of counterrotating vortex rings, whose circulation, in the absence of viscosity Author: J. Martin and E. Meiburg. Publication Data. This work introduces a new class of steady solutions of the axisymmetric Euler equations for an incompressible inviscid fluid.

Each solution represents a three-dimensional vortex flow whose azimuthal components of vorticity and velocity are nonzero inside a Cited by: J.

Martinand E. Meiburg, “ Nonlinear axisymmetric and three-dimensional vorticity dynamics in a swirling model,” Phys. Fluids 8, (). Google Scholar Scitation; 3. Martinand E. Meiburg, “ The growth and nonlinear evolution of helical disturbances in a swirling jet model,” Eur.

Mech. B/Flu (). Google Scholar Cited by: The present computational study concerns the three-dimensional evolution of a nominally axisymmetric jet with swirl subject to axisymmetric and azimuthal perturbations. We employ an inviscid vortex filament technique to gain insight into the vorticity dynamics of the by: 1.

Direct numerical simulation (DNS) of a swirling jet near the outlet of a nozzle with axisymmetric and non-axisymmetric disturbances is performed to investigate the dynamic characteristics of the fl.

Using a three-dimensional, nonhydrostatic, but linear model, the dynamics of asymmetries to tropical-cyclone-like vortices caused by instantaneous symmetric and asymmetric temperature perturbations have been analyzed.

In Part I, these disturbances were shown to evolve through a two-part adjustment process. First, there is hydrostatic and Cited by: MARTIN, J.E.

and MEIBURG, E. Nonlinear Axisymmetric and Three-Dimensional Vorticity Dynamics in a Swirling Jet Model, Center for Modeling and Simulation Report No. CMS, University of Southern California. MARTIN, J.E. and MEIBURG, E.

The Three-Dimensional Evolution of an Axisymmetric Jet: A Numerical. Get this from a library. Nonlinear axisymmetric and three-dimensional vorticity dynamics in a swirling jet model.

[J E Martin; E Meiburg; Institute for Computer Applications in. The growth and nonlinear evolution of a helical perturbation is investigated in a simplified swirling jet model, consisting of a line vortex along the axis surrounded by a jet shear layer with both azimuthal and streamwise by: 6.

The temporal instability and nonlinear evolution of the swirling jet near a nozzle exit are studied by both normal-mode method and three dimensional direct numerical simulation (3D DNS).

It is found that the swirl enhances the maximum linear growth rates for negative helical modes, while decreases the growth rate for axisymmetric by: 4. We study the three-dimensional evolution of a nominally axisymmetric jet subject to helical perturbations. Our approach is a computational one, employing an inviscid vortex filament technique to gain insight into the vorticity dynamics of jets dominated by helical by: Nonlinear axisymmetric and three‐dimensional vorticity dynamics in a swirling jet model Physics of Fluids, Vol.

8, No. 7 Hypervelocity Scramjet Mixing Enhancement. Nonlinear axisymmetric and three‐dimensional vorticity dynamics in a swirling jet model Physics of Fluids, Vol.

8, No. 7 Hypervelocity Scramjet Mixing EnhancementCited by: Computed examples of flow dynamics demonstrate agreement with linear and nonlinear stability theories of vortex flows in a finite-length pipe.

Agreement is also found with theoretically predicted steady axisymmetric breakdown states in a pipe as flow evolves to a time-asymptotic by: 2. Helical perturbations in a swirling jet model I r Fig. - Simplified model of a swirling jet flow. The centerline vortex of strength I‘. is surrounded by a nominally axisymmetric jet shear layer containing helical vortex lines of pitch 4).

In this paper, we study the dynamic stability of the three-dimensional axisymmetric Navier-Stokes Equations with swirl. To this purpose, we propose a new one-dimensional model that approximates. The nonlinear evolution of the three-dimensional instability of a viscous unsteady swirling jet, namely, the Batchelor vortex, is addressed.

Two types of initial perturbations are considered: a. A numerical method is developed for nonlinear three-dimensional but axisymmetric free-surface problems using a mixed Eulerian-Lagrangian scheme under the assumption of potential flow.

Taking advantage of axisymmetry, Rankine ring sources are used in a Green's theorem boundary-integral formulation to solve the field equation; and the free. ELSEVIER Application of a nonlinear stress-strain model to axisymmetric turbulent swirling flows K. Wall and D. Taulbee Department of Mechanical and Aerospace Buffalo, Amherst, New York, USA Engineering, Jarvis Hall, State University of New York at A nonlinear stress-strain relation (NLSM) for the turbulence stresses is applied to axisymmetric free shear flows with and without by: In Wang's approach, the vorticity is represented by the sum of a linear function of the streamfunction and an assumed auxiliary function, such that the vorticity equation can be reduced to a quasi-linear partial differential equation, and exact solutions are obtainable for many choices of the auxiliary : Nolan J.

Dyck, Anthony G. Straatman. On the impact of swirl on the growth of coherent structures - Volume - K.

Oberleithner, C. Paschereit, I. WygnanskiCited by: AXIS SWITCHING AND SPREADING OF AN ASYMMETRIC JET - ROLE OF VORTICITY DYNAMICS by K. Zaman NASA Lewis Research Center Cleveland, OH Abstract The effects of vortex generators and periodic ex-citation on vorticity dynamics and the phenomenon of axis switching in a free asymmetric jet are studied Size: 1MB.

10 Three-Dimensional Flow Visualization and Vorticity Dynamics in 11 Revolving Wings 12 13 14 Authors: Bo Cheng1, Sanjay P.

Sane2, Giovanni Barbera1, Daniel R. Troolin3, Tyson Strand3 15 and Xinyan Deng1* 16 1School of Mechanical Engineering, Purdue University, West Lafayette, IN File Size: 3MB. Two-dimensional Vorticity Dynamics Simple dynamics: an integrable motion Triangle shape oscillates with a period T1 Triangle rotates with a period T2 T 1 T 2 is rational number (initial condition).

A special chapter is devoted to ‘swirling motion’, though this can be regarded as arising from a three-dimensional vorticity eld with curved (e.g. helical) vortex lines. The inviscid theory for steady axisymmetric ﬂow is rst developed, and then viscous modi cations are discussed, en route to discussing the important phenomenon of.

This is particularly significant for future modeling studies that make use of the outer flow conditions as lateral boundary conditions on a tornado vortex model. Retrieved Three‐Dimensional Winds [15] Figure 2 depicts the evolution of the axisymmetric horizontal winds of the tornado at 50 m AGL.

Initially, there is strong flow (∼20 m/s. In the present work, a new proposed VLES turbulence closure model, namely, VLES BSL k-ω, and other two models, denoted as VLES k-ε and VLES k-ω, are applied for the strong swirling flow simulation.

Two meshes containing about million and Author: Zhaoyang Xia, Xingsi Han, Junkui Mao. The vorticity dynamics in the near field of laminar (Re = ) co-flowing jets subjected to the single or combined effeets of axial and azimuthal forcing is analyzed.

It is shown that the interaction of the three-dimensional vortex structure resulting from the growth of the. nonlinear modeling and feedback control of vorticity behind an immersed circular cylinder system was developed. In this technique first a number of control input points over the cylinder and some measurement points for vorticity past the cylinder are assigned.

A type of nonlinear dynamic model. Frontiers of Fluid Mechanics documents the proceedings of the Beijing International Conference on Fluid Mechanics, held in Beijing, People's Republic of China, July The aims of the conference were to provide a forum for a cross-sectional review of the state-of-the-art and new advances in various branches of fluid mechanics, and to.

A new model of the axisymmetric body referred to in earlier studies as the “Iowa Body” was constructed with the tail truncated at a diameter of cm to accommodate a swirling jet of diameter D= cm issuing from the base, as shown in Figure jet diameter is smaller than the diameter, D p = cm, of the propeller used by Hyun and Patel ().

Many important phenomena in fluid motion are evident in vortex flow, i.e., flows in which vortical structures are significant in determining the whole flow.

This book, which consists of lectures given at a NATO ARW held in Grenoble (France) in Juneprovides an up-to-date account of. Nonlinear Axisymmetric and Three-dimensional Vorticity Dynamics in a Swirling Jet Model, with J.E. Martin, Phys.

Fluids 8, p. PDF. The Effect of Streamwise Braid Vortices on the Particle Dispersion in a Plane Mixing Layer. Part 2: Nonlinear Particle Dynamics, with B. Marcu and N. Raju, Phys. Fluids 8, p.

PDF. An explanation of the turbulent round-jet/plane-jet anomaly. S. B. Pope ; S. B. Pope. Imperial College, London, England vorticity dynamics.

Arash Zandian, A unified turbulence closure model for axisymmetric and planar free shear flows.appropriate to treat nonlinear stability of axisymmetric, swirling flows to axisymmetric perturbations. This makes the flows 'essentially'. two-dimensional, and avoids what seem to be insuperable problems in the application of the Arnol'd method to fully general three-dimensional flows (Holm et al.

I). Because vortex breakdowns of the bubble.numerically, in case of weak swirling flows standard model can successfully predict the flow. Numerical investigations in [19] showed that for low swirl, RNG model gives better prediction than Reynolds stress model, while for higher swirl, Reynolds stress models are more appropriate.