Gotowe bibliografie tematyczne / Vortex instability

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Gotowa bibliografia na temat „Vortex instability”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Vortex instability"

Koshel, Konstantin V., i Eugene A. Ryzhov. "Parametric resonance in the dynamics of an elliptic vortex in a periodically strained environment". Nonlinear Processes in Geophysics 24, nr 1 (12.01.2017): 1–8. http://dx.doi.org/10.5194/npg-24-1-2017.

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Abstract. The model of an elliptic vortex evolving in a periodically strained background flow is studied in order to establish the possible unbounded regimes. Depending on the parameters of the exterior flow, there are three classical regimes of the elliptic vortex motion under constant linear deformation: (i) rotation, (ii) nutation, and (iii) infinite elongation. The phase portrait for the vortex dynamics features critical points which correspond to the stationary vortex not changing its form and orientation. We demonstrate that, given superimposed periodic oscillations to the exterior deformation, the phase space region corresponding to the elliptic critical point experiences parametric instability leading to locally unbounded dynamics of the vortex. This dynamics manifests itself as the vortex nutates along the strain axis while continuously elongating. This motion continues until nonlinear effects intervene near the region associated with the steady-state separatrix. Next, we show that, for specific values of the perturbation parameters, the parametric instability is effectively suppressed by nonlinearity in the primal parametric instability zone. The secondary zone of the parametric instability, on the contrary, produces an effective growth of the vortex's aspect ratio.

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MacKay, R. S. "Instability of vortex streets". Dynamics and Stability of Systems 2, nr 1 (styczeń 1987): 55–71. http://dx.doi.org/10.1080/02681118708806027.

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Acheson, D. J. "Instability of vortex leapfrogging". European Journal of Physics 21, nr 3 (1.05.2000): 269–73. http://dx.doi.org/10.1088/0143-0807/21/3/310.

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Marxen, Olaf, Matthias Lang i Ulrich Rist. "Vortex formation and vortex breakup in a laminar separation bubble". Journal of Fluid Mechanics 728 (1.07.2013): 58–90. http://dx.doi.org/10.1017/jfm.2013.222.

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AbstractThe convective primary amplification of a forced two-dimensional perturbation initiates the formation of essentially two-dimensional large-scale vortices in a laminar separation bubble. These vortices are then shed from the bubble with the forcing frequency. Immediately downstream of their formation, the vortices get distorted in the spanwise direction and quickly disintegrate into small-scale turbulence. The laminar–turbulent transition in a forced laminar separation bubble is dominated by this vortex formation and breakup process. Using numerical and experimental data, we give an in-depth characterization of this process in physical space as well as in Fourier space, exploiting the largely periodic character of the flow in time as well as in the spanwise direction. We present evidence that a combination of more than one secondary instability mechanism is active during this process. The first instability mechanism is the elliptic instability of vortex cores, leading to a spanwise deformation of the cores with a spanwise wavelength of the order of the size of the vortex. Another mechanism, potentially an instability of flow in between two consecutive vortices, is responsible for three-dimensionality in the braid region. The corresponding disturbances possess a much smaller spanwise wavelength as compared to those amplified through elliptic instability. The secondary instability mechanisms occur for both fundamental and subharmonic frequency, respectively, even in the absence of continuous forcing, indicative of temporal amplification in the region of vortex formation.

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SCHAEFFER, NATHANAËL, i STÉPHANE LE DIZÈS. "Nonlinear dynamics of the elliptic instability". Journal of Fluid Mechanics 646 (8.03.2010): 471–80. http://dx.doi.org/10.1017/s002211200999351x.

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In this paper, we analyse by numerical simulations the nonlinear dynamics of the elliptic instability in the configurations of a single strained vortex and a system of two counter-rotating vortices. We show that although a weakly nonlinear regime associated with a limit cycle is possible, the nonlinear evolution far from the instability threshold is, in general, much more catastrophic for the vortex. In both configurations, we put forward some evidence of a universal nonlinear transition involving shear layer formation and vortex loop ejection, leading to a strong alteration and attenuation of the vortex, and a rapid growth of the vortex core size.

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LEWEKE, T., i C. H. K. WILLIAMSON. "Cooperative elliptic instability of a vortex pair". Journal of Fluid Mechanics 360 (10.04.1998): 85–119. http://dx.doi.org/10.1017/s0022112097008331.

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In this paper, we investigate the three-dimensional instability of a counter-rotating vortex pair to short waves, which are of the order of the vortex core size, and less than the inter-vortex spacing. Our experiments involve detailed visualizations and velocimetry to reveal the spatial structure of the instability for a vortex pair, which is generated underwater by two rotating plates. We discover, in this work, a symmetry-breaking phase relationship between the two vortices, which we show to be consistent with a kinematic matching condition for the disturbances evolving on each vortex. In this sense, the instabilities in each vortex evolve in a coupled, or ‘cooperative’, manner. Further results demonstrate that this instability is a manifestation of an elliptic instability of the vortex cores, which is here identified clearly for the first time in a real open flow. We establish a relationship between elliptic instability and other theoretical instability studies involving Kelvin modes. In particular, we note that the perturbation shape near the vortex centres is unaffected by the finite size of the cores. We find that the long-term evolution of the flow involves the inception of secondary transverse vortex pairs, which develop near the leading stagnation point of the pair. The interaction of these short-wavelength structures with the long-wavelength Crow instability is studied, and we observe significant modifications in the longevity of large vortical structures.

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Barnes, C. J., M. R. Visbal i P. G. Huang. "On the effects of vertical offset and core structure in streamwise-oriented vortex–wing interactions". Journal of Fluid Mechanics 799 (21.06.2016): 128–58. http://dx.doi.org/10.1017/jfm.2016.320.

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This article explores the three-dimensional flow structure of a streamwise-oriented vortex incident on a finite aspect-ratio wing. The vertical positioning of the incident vortex relative to the wing is shown to have a significant impact on the unsteady flow structure. A direct impingement of the streamwise vortex produces a spiralling instability in the vortex just upstream of the leading edge, reminiscent of the helical instability modes of a Batchelor vortex. A small negative vertical offset develops a more pronounced instability while a positive vertical offset removes the instability altogether. These differences in vertical position are a consequence of the upstream influence of pressure gradients provided by the wing. Direct impingement or a negative vertical offset subject the vortex to an adverse pressure gradient that leads to a reduced axial velocity and diminished swirl conducive to hydrodynamic instability. Conversely, a positive vertical offset removes instability by placing the streamwise vortex in line with a favourable pressure gradient, thereby enhancing swirl and inhibiting the growth of unstable modes. In every case, the helical instability only occurs when the properties of the incident vortex fall within the instability threshold predicted by linear stability theory. The influence of pressure gradients associated with separation and stall downstream also have the potential to introduce suction-side instabilities for a positive vertical offset. The influence of the wing is more severe for larger vortices and diminishes with vortex size due to weaker interaction and increased viscous stability. Helical instability is not the only possible outcome in a direct impingement. Jet-like vortices and a higher swirl ratio in wake-like vortices can retain stability upon impact, resulting in the laminar vortex splitting over either side of the wing.

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Mounce, A. M., S. Oh, S. Mukhopadhyay, W. P. Halperin, A. P. Reyes, P. L. Kuhns, K. Fujita, M. Ishikado i S. Uchida. "Charge-induced vortex lattice instability". Nature Physics 7, nr 2 (28.11.2010): 125–28. http://dx.doi.org/10.1038/nphys1835.

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Tophøj, Laust, i Hassan Aref. "Instability of vortex pair leapfrogging". Physics of Fluids 25, nr 1 (styczeń 2013): 014107. http://dx.doi.org/10.1063/1.4774333.

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Sukhanovskii, A., A. Evgrafova i E. Popova. "Instability of cyclonic convective vortex". IOP Conference Series: Materials Science and Engineering 208 (czerwiec 2017): 012040. http://dx.doi.org/10.1088/1757-899x/208/1/012040.

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Rozprawy doktorskie na temat "Vortex instability"

Mao, Xuerui. "Vortex instability and transient growth". Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6442.

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The dynamics of vortex flow is studied theoretically and numerically. Starting from a local analysis, where the perturbation in the vortex flow is Fourier decomposed in both radial and azimuthal directions, a modified Chebyshev polynomial method is used to discretize the linearized governing operator. The spectrum of the operator is divided into three groups: discrete spectrum, free-stream spectrum and potential spectrum. The first can be unstable while the latter two are always stable but highly non-normal. The non-normality of the spectra is quantitatively investigated by calculating the transient growth via singular value decomposition of the operator. It is observed that there is significant transient energy growth induced by the non-normality of continuous spectra. The non-normality study is then extended to a global analysis, in which the perturbation is decomposed in the radial or azimuthal direction. The governing equations are discretized through a spectral/hp element method and the maximum energy growth is calculated via an Arnoldi method. In the azimuthally-decomposed case, the development of the optimal perturbation drives the vortex to vibrate while in the stream-wise-decomposed case, the transient effects induce a string of bubbles along the axis of the vortex. A further transient growth study is conducted in the context of a co-rotating vortex pair. It is noted that the development of optimal perturbations accelerates the vortex merging process. Finally, the transient growth study is extended to a sensitivity analysis of the vortex flow to inflow perturbations. An augmented Lagrangian function is built to optimize the inflow perturbations which maximize the energy inside the domain over a fixed time interval.

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Altay, Hurrem Murat. "Vortex driven flame dynamics and combustion instability". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32379.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
Includes bibliographical references (leaves 87-93).
Combustion instability in premixed combustors mostly arises due to the coupling between heat release rate dynamics and system acoustics. It is crucial to understand the instability mechanisms to design reliable, high efficiency, low emission gas turbine combustors. In this thesis, elementary processes acting as a source of unsteady heat release rate are described. These elementary processes are acoustic wave-flame interactions, flame-vortex interactions, equivalence ratio fluctuations, flame-wall interactions and the unsteady stretch rate. To investigate the flame- vortex interaction mechanism, a parametric study is performed in single and double expansion dump combustors. 2-D simulations are performed using the random vortex method combined with thin flame model of premixed combustion. The inlet velocity of the combustor is forced sinusoidally at various amplitudes and frequencies, and the heat release rate response is evaluated. It is shown that the heat release rate dynamics are governed by the cyclical formation of a large wake vortex and its interaction with the flame. Maximum heat release rate in a cycle is reached a short time after the breakup of the vortex, which causes rapid burning of the reactants trapped within the structure. The geometry and operating conditions of the combustor control the mechanism by which the vortex breakup is initiated. For short cavities, the impingement of the large wake vortex onto the forward facing step is responsible from the vortex breakup.
(cont.) On the other hand, in long cavities, the vortex breakup is initiated as the wake vortex impinges on the upper cavity wall in single expansion dump combustor, or the vortex forming in the other half of the combustor in double expansion dump combustor. Furthermore, the effect of the air injection in the cross stream direction close to the dump plane on equivalence ratio is investigated. It is shown experimentally that high amplitude pressure oscillation in the combustor during unstable operation causes fluctuation in the injected jet velocity. The oscillatory jet velocity affects the incoming equivalence ratio depending on the momentum ratio of the jet to the primary stream. A critical momentum ratio is defined at which the amplitude of the equivalence ratio oscillations reaches a maximum.
by Hurrem Murat Altay.
S.M.

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Rostami, Masoud. "Dynamical influence of diabatic processes upon developing instabilities of Earth and planetary jets and vortices". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066186.

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Le but de la thèse est de comprendre l'influence dynamique des effets diabatiques, comme la convection humide, sur les instabilités des vortex atmosphériques terrestres et planétaires. Un modèle verticalement intégré, avec les paramétrisations type relaxation des transitions de phase et de dégagement de la chaleur latente, le modèle de St-Venant avec la convection humide, a été utilisé. La version précédente du modèle a été améliorée pour inclure l'eau précipitable, sa vaporisation et son entrainement. L'approche consiste en 1) analyse détaillée de stabilité des profils idéalisés, ou extraits des données, des vortex, 2) étude de saturation non-linéaire des instabilités à l'aide de schéma numérique de haute résolution aux volumes finis. Les résultats principaux de la thèse sont : 1. Démonstration et quantification d'une forte influence des effets humides sur les instabilités des vortex synoptiques, y compris asymétrie cyclone-anticyclone des vortex de faible intensité aux latitudes moyennes, et de l'intensification des vortex type cyclones tropicaux, avec formation des nuages caractéristiques. 2. Explication de l'origine dynamique de l'hexagone au pôle Nord de Saturne, et de l'absence de structure similaire au pôle Sud, en termes d'instabilité du système vortex polaire - jet circumpolaire, et sa saturation non-linéaire. 3. Explication de la structure observée du vortex polaire hivernal sur Mars en termes d'instabilité et sa saturation en présence de réchauffement /refroidissement radiatif et de déposition de CO2 (transition de phase gaz - solide). Une nouvelle paramétrisation simple a été proposée pour ce processus, incluant l'influence des noyaux de déposition
The thesis is devoted to understanding dynamical influence of diabatic effects, like moist convection, on instabilities of vortices in Earth and planetary atmospheres. A vertically integrated atmospheric model with relaxational parameterisation of phase transitions and related heat release, and with convective fluxes included in mass and momentum equations, the moist-convective rotating shallow water model, was used for this purpose. The previous version of the model was improved to include precipitable water and its vaporisation and entrainment. The approach consists in 1)detailed stability analysis of idealised, or extracted from the data, vortex profiles, 2)study of nonlinear saturation of the instabilities with the help of finite-volume high-resolution numerical code. The main results of the thesis are: 1. Demonstration and quantification of strong influence of moist effects upon instabilities of synoptic vortices, including cyclone-anticyclone asymmetry of mid-latitude vortices of weak intensity, and intensification of tropical-cyclone like vortices with formation of typical cloud patterns. 2. Explanation of the dynamical origin of the Saturn's North Polar hexagon, and of the lack of similar structure at the South Pole, in terms of instability of the coupled polar vortex and circumpolar jet, and their nonlinear saturation.3. Explanation of the observed structure of Mars' winter polar vortex in terms of instability of the latter, and its saturation in the presence of radiative heating/cooling and CO2 deposition (gas-solid phase transition). A new simple parameterisation of the latter process, including the influence of deposition nuclei, was developed in the thesis

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Amirante, Daria. "A numerical study of instability and vortex breakdown of swirling flow". Thesis, University of Southampton, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485518.

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Direct numerical simulations ofboth axisymmetric and three-dimensional highly swirling flows are conducted to study the vortex breakdown phenomenon and the onset of helical instabilities. The enduring debate on the physical reasons underlying the breakdown of slender v9rtices has widely involved theoretical, experimental and computational studies. In the present investigation, we are motivated by the necessity to evaluate the range of applicability of recent studies which have correlated the global response of this class of flows to their local stability characteristics. In synthesis, the dynamics of the unsteady structures developing in swirling flows are explained according to simplified theories which assume the flow to be locally parallel. These results, which might be considereg as the Cnatural extension of concepts well established for two-dimensional jets and wakes, appear to be quite surprising if applied to swirling flows in breakdown configuration. In fact, the presence of one or more large regions of recirculating flow (the vortex bubbles) renders the assumption ofnear parallelism strongly violated. Inspired by this observation, we have carried out a numerical investigation in order to study the evolution of self-sustained oscillations. For this purpose, a finite difference code has been developed and later adapted to perform linear analysis around a given parallel swirling flow. Successively, a comparative study between the global and local analysis methodologies has been conducted. The novelty of the work is rep~esented by the use of simple filtering techniques which can be implicitly activated if the cylindrical coordinates are employed. These have made possible to focus on the nonlinear evolution . of higher order modes. Following this strategy, we have identified an instability mechanism which cannot be explained by the local theory and whose existence is clearly associated with the presence of recirculating flow. The result is considered important since it provides a further contribution to the general understanding of the global modes. Throughout this thesis we have followed a bottom-up approach in terms ofthe assumptions undertaken. The general stability properties of swirling flows are initially revisited based on 1D models. The hypothesis of one-dimensionality has been later replaced by that ofaxisymmetry. Real swirling flows are examined in the final chapter for Reynolds numbers in the range of those generally employed in the physical experiments.

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Quaranta, Hugo. "Instabilities in a swirling rotor wake". Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0052.

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Cette thèse est consacrée à l'étude des instabilités du sillage tourbillonnaire des rotors, largement utilisés dans l'industrie pour la conversion d'énergie mécanique. Leur sillage peut être modélisé par un ensemble de vortex hélicoïdaux entrelacés, au sein duquel de nombreuses instabilités peuvent émerger. Ces mécanismes ont un impact significatif sur l'évolution intermédiaire du sillage et peuvent influencer les performances du rotor. Ce travail, plus particulièrement dédié aux hélicoptères, s'est tout d'abord attaché à caractériser expérimentalement l'écoulement derrière trois rotors conçus pour des régimes de vols différents. Ces conditions de bases ont ensuite servi à étudier les différents modes instables de grande longueur d'onde pouvant apparaître dans le sillage. Une bonne correspondance est trouvée entre les prédictions théoriques et les mesures expérimentales des taux de croissance associés. Une rapide analyse de l'évolution spatio-temporelle de ces perturbations a permis d'étudier la propagation d'une perturbation localisée dans le plan rotor. Il est en effet envisagé que dans certaines configurations de vol de descente, les instabilités provoquent la transition du sillage vers un état spécifique connu sous le nom d'état d'anneau tourbillonnaire, potentiellement dangereux pour l'appareil. Il se caractérise par une stagnation du sillage au voisinage du plan rotor qui en dégrade les performances
This work studies the instabilities associated with the wake of a rotor. These devices are used in many applications such as energy harvesting or propulsion,and their optimisation is crucial for both industry and the environment. The wakebehind a rotor is broadly defined as a system of interlaced helical vortices, whose dynamics governs the transition from the near-wake to the far-wake regime. In our first study, we investigate the wake behind different small-scale rotors in their design operating condition. We use the resulting flows in a subsequent linear stability analysis, aiming at predicting long-wavelength instability modes in the helical vortex. We find that the theoretical prediction of the modes growth-rates matches our experimental measurements. We also show that the dynamics of helical vortex filaments can be predicted from simple two-dimensional theory. In more critical flow configurations, instabilities are suspected to promote the transition to hazardous regimes such as the so called Vortex-Ring State, characterised by large-scale recirculating structures.The second part of this work is thus dedicated to the spatio-temporal evolution of localised perturbations in the rotor plane, and their potential tendency to propagate upstream in the flow

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Pang, Bin. "Active suppression of vortex-driven combustion instability using controlled liquid-fuel injection". College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2958.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.
Thesis research directed by: Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Waleffe, Fabian. "The 3D instability of a strained vortex and its relation to turbulence". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14221.

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MEN'SHOV, Igor, i Yoshiaki NAKAMURA. "On Instability of Acoustic Waves Propagating in Stratified Vortical Flows". The Japan Society of Mechanical Engineers, 2002. http://hdl.handle.net/2237/9091.

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Khan, Md Abdul Hakim. "Singularity analysis by summing power series". Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368391.

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Kim, Inchul. "Numerical study of the onset of instability in the flow past a sphere". Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184809.

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Experiment shows that the steady axisymmetric flow past a sphere becomes unstable in the range 120 < Re < 300. The resulting time-dependent nonaxisymmetric flow gives rise to nonaxisymmetric vortex shedding at higher Reynolds numbers. The present work reports a computational investigation of the linear stability of the axisymmetric base flow. When the sphere is towed, fixed, or otherwise constrained, stability is determined solely by the Reynolds number. On the other hand, when the sphere falls due to gravity, the present work shows that a additional parameter, the ratio of fluid density to sphere density (β = ρ(f)/ρ(s)) is involved. We use a spectral technique to compute the steady axisymmetric flow, which is in closer agreement with experiment than previous calculations. We then perform a linear stability analysis of the base flow with respect to axisymmetric and nonaxisymmetric disturbances. A spectral technique similar to that employed in the base flow calculation is used to solve the linear disturbance equations in streamfunction form for axisymmetric disturbances, and in a modified primitive variable form for nonaxisymmetric disturbances. For the density ratio β = 0, which corresponds to a fixed sphere, the analysis shows that the axisymmetric base flow undergoes a Hopf bifurcation at Re = 175.1, with the critical disturbance having azimuthal wavenumber m = 1. The results are favorably compared to previous experimental work.

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Książki na temat "Vortex instability"

Hall, Philip. On the Gortler vortex instability mechanism at hypersonic speeds. Hampton, Va: ICASE, 1989.

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Hall, Philip. On the Goertler vortex instability mechanism at hypersonic speeds. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1989.

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Otto, S. R. On the secondary instability of the most dangerous Gortler vortex. Hampton, Va: Institute for Computer Applications in Science and Engineering, 1993.

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P, Bassom Andrew, i Institute for Computer Applications in Science and Engineering., red. On the instability of Görtler vortices to nonlinear travelling waves. Hampton, Va: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1990.

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Otto, S. R. On the secondary instability of the most dangerous Go rtler vortex. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1993.

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Denier, James P. The effect of wall compliance on the Gortler vortex instability. Hampton, Va: Institute for Computer Applications in Science and Engineering, 1990.

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Hall, Philip. The inviscid secondary instability of fully nonlinear longitudinal vortex structures in growing boundary layers. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Michalke, Alfons. A note on the instability of a vortex sheet leaving a semi-infinite plate. Koln: DFVLR, 1987.

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Arbic, Brian K. Generation of mid-ocean eddies: The local baroclinic instability hypothesis. Cambridge, Mass: Massachusetts Institute of Technology, 2000.

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Arbic, Brian K. Generation of mid-ocean eddies: The local baroclinic instability hypothesis. Cambridge, Mass: Massachusetts Institute of Technology, 2000.

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Części książek na temat "Vortex instability"

Tang, S. J., F. G. Zhuang i T. D. Hsing. "The Nonlinear Stability of Vortex Flows and Vortex Breakdown". W Nonlinear Instability of Nonparallel Flows, 300–309. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85084-4_25.

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Drazin, P. G., W. H. H. Banks i M. B. Zaturska. "The Instability of Long’s Vortex". W Nonlinear Instability of Nonparallel Flows, 281–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85084-4_23.

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Berger, Stanley A. "Ellipticity in the Vortex Breakdown Problem". W Instability, Transition, and Turbulence, 96–106. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2956-8_11.

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Fisher, L. M., P. E. Goa, M. Baziljevich, T. H. Johansen, A. L. Rakhmanov i V. A. Yampol’skii. "The Hydrodynamic Instability in the Vortex-Anti-Vortex System". W New Trends in Superconductivity, 385–93. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0544-9_34.

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Singer, Bart A. "The Formation and Growth of a Hairpin Vortex". W Instability, Transition, and Turbulence, 367–76. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2956-8_36.

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Bernard, Peter S., Siva Thangam i Charles G. Speziale. "The Role of Vortex Stretching In Turbulence Modeling". W Instability, Transition, and Turbulence, 563–74. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2956-8_54.

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Anderson, Christopher, Claude Greengard i Michael Henderson. "Instability, vortex shedding, and numerical convergence". W Lecture Notes in Mathematics, 42–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/bfb0089770.

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Eloy, C., i S. Le Dizès. "Instability of Non-Axisymmetric Vortex Flows". W Fluid Mechanics and Its Applications, 357–60. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5118-4_88.

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Walton, A. G., R. I. Bowles i F. T. Smith. "Vortex-Wave Interaction in a Strong Adverse Pressure Gradient". W Instability, Transition, and Turbulence, 79–91. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2956-8_9.

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Meunier, Patrice, i Thomas Leweke. "Merging and Three-dimensional Instability in a Corotating Vortex Pair". W Vortex Structure and Dynamics, 241–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-44535-8_15.

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Streszczenia konferencji na temat "Vortex instability"

Rebours, Renaud, i Kamran Rokhsaz. "Flap Sizing for Wake Vortex Instability". W General Avaition Technology Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1693.

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Abu-Irshaid, Esam, Joseph Majdalani i Gregoire Casalis. "Hydrodynamic Instability of the Bidirectional Vortex". W 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-4531.

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Gallaire, Francois, i Philippe Meliga. "Global instability of helical vortex breakdown". W 6th AIAA Theoretical Fluid Mechanics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-3604.

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Zhu, Fanglin, Xieyuan Yin i Jiezhi Wu. "Short-wave instability of strained swirling vortex". W 37th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-139.

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Yu, Ken H., K. J. Wilson i Klaus C. Schadow. "Active Instability Suppression Using Vortex-Droplet Interaction". W ICLASS 97. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/iclass-97.460.

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ZUKOSKI, E. "Combustion instability sustained by unsteady vortex combustion". W 21st Joint Propulsion Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-1248.

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Wang, Junrong, Qi Xiao, Hanbing Ke, Xu Hu, Shaodan Li i Zhiguo Wei. "Numerical Simulation of Flow Instability in Vortex Diodes". W 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66512.

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Streszczenie:

A vortex diode is used as a highly reliable check-valve in nuclear applications, where it mainly benefits from the intrinsic properties of no moving parts and no leakage. Its basic principle is similar to the diode in an electric circuit. The typical structure of a vortex diode consists of a chamber with axial and tangential ports. When the fluid is injected through the axial port, a simple radial flow in the chamber leads to a relatively low flow resistance. On the other hand, in the reverse flow mode, a strongly swirling vortex can be set up in the chamber, resulting in a very high flow resistance. Several experimental studies found vortex-induced vibration of a vortex diode in the reverse flow mode, where it indicated that the flow was unstable in the vortex diode. This phenomenon may affect the reliability of the vortex diode. However, the mechanism has not been investigated systematically and profoundly. In this paper, 3-D simulations are carried out to help understand the related flow characteristics in the vortex diode. Standard k-ε model was selected for forward flow, while Reynolds stress model was selected for reverse flow. We have found that the results from transient simulations are in good agreement with experimental data. The transient simulations also capture the periodic pressure fluctuation in the vortex diode. Vortex diodes with different structures and geometrical parameters are simulated at different Reynolds number conditions. It is found that the characteristics of the pressure fluctuation are determined by the structure parameters and working conditions of the vortex diode. The flow instability is mainly caused by the asymmetry of the vortex diode. The work presented in this paper will be useful to give better understanding of flows in vortex diodes and to provide some guidance for optimizing the vortex diode.

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Ruprecht, Albert, Ralf Neubauer i Thomas Helmrich. "Simulation of Vortex Instability in a Pipe Trifurcation". W ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45438.

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The vortex instability in a spherical pipe trifurcation is investigated by applying a Very Large Eddy Simulation (VLES). For this approach an new adaptive turbulence model based on an extended version of the k-ε model is used. Applying a classical Reynolds-averaged Navier-Stokes-Simulation with the standard k-ε model is not able to forecast the vortex instability. However the prescribed VLES method is capable to predict this flow phenomenon. The obtained results show a reasonable agreement with measurements in a model test.

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Xu, Guoliang, Gang Liu i Xiong Jiang. "The nonlinear instability of the supersonic crossflow vortex". W 44th AIAA Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-2637.

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Hussain, Mukkarum, Shamoon Jamshed i Maryam Ozair. "Simulations and Analysis of Vortex Driven Combustion Instability". W 2022 19th International Bhurban Conference on Applied Sciences and Technology (IBCAST). IEEE, 2022. http://dx.doi.org/10.1109/ibcast54850.2022.9990249.

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Raporty organizacyjne na temat "Vortex instability"

Wang, Hong Yun. A study of short wave instability on vortex filaments. Office of Scientific and Technical Information (OSTI), grudzień 1996. http://dx.doi.org/10.2172/451206.

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Gordnier, Raymond E. Computation of a Kelvin-Helmholtz Instability for Delta Wing Vortex Flows. Fort Belvoir, VA: Defense Technical Information Center, listopad 1991. http://dx.doi.org/10.21236/ada244320.

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