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Littérature scientifique sur le sujet « Rossby waves »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 30 juillet 2024

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Articles de revues sur le sujet "Rossby waves"

Knessl, Charles, et Joseph B. Keller. « Rossby Waves ». Studies in Applied Mathematics 94, n^o 4 (mai 1995) : 359–76. http://dx.doi.org/10.1002/sapm1995944359.

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Müller, Detlev. « Trapped Rossby waves ». Physical Review E 61, n^o 2 (1 février 2000) : 1468–85. http://dx.doi.org/10.1103/physreve.61.1468.

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Cheverry, Christophe, Isabelle Gallagher, Thierry Paul et Laure Saint-Raymond. « Trapping Rossby waves ». Comptes Rendus Mathematique 347, n^o 15-16 (août 2009) : 879–84. http://dx.doi.org/10.1016/j.crma.2009.05.007.

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Biancofiore, L., et F. Gallaire. « Counterpropagating Rossby waves in confined plane wakes ». Physics of Fluids 24, n^o 7 (juillet 2012) : 074102. http://dx.doi.org/10.1063/1.4729617.

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Avalos-Zuniga, R., F. Plunian et K. H. Rädler. « Rossby waves andα-effect ». Geophysical & ; Astrophysical Fluid Dynamics 103, n^o 5 (octobre 2009) : 375–96. http://dx.doi.org/10.1080/03091920903006099.

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Miles, John. « Resonantly Forced Rossby Waves ». Journal of Physical Oceanography 15, n^o 4 (avril 1985) : 467–74. http://dx.doi.org/10.1175/1520-0485(1985)015<0467:rfrw>2.0.co;2.

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Fedotova, Maria, Dmitry Klimachkov et Arakel Petrosyan. « Resonant interactions of magneto-Poincaré and magneto-Rossby waves in quasi-two-dimensional rotating astrophysical plasma ». Monthly Notices of the Royal Astronomical Society 509, n^o 1 (14 octobre 2021) : 314–26. http://dx.doi.org/10.1093/mnras/stab2957.

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ABSTRACT Increased interest in research of non-linear resonant interactions of waves in rotating astrophysical plasma has taken place in recent years. This is due to the discovering solar magneto-Rossby waves and the emergence of new data on the effect of three-wave interactions of magneto-Rossby waves on solar activity. In context of large-scale magnetohydrodynamic flows in presence of rotation, magneto-Poincaré waves and magneto-Rossby waves are highlighted. The β-plane approximation is developed to simplify the theory of spherical Rossby waves. Nevertheless, the representation of the Coriolis force in this approximation contains a latitude-independent term that ensures the existence of magneto-Poincaré waves on β-plane along with magneto-Rossby waves. In this paper, it is shown that they satisfy the phase matching condition, which leads to emergence of new non-linear interactions mechanisms of waves: two magneto-Poincaré waves and one magneto-Rossby wave; two magneto-Rossby waves and one magneto-Poincaré. Complete dispersion equations on β-plane in quasi-two-dimensional magnetohydrodynamic approximation is analysed both for homogeneous and stratified astrophysical plasma with vertical magnetic field. New dispersion relations for magneto-Poincaré waves on β-plane are obtained. Detailed qualitative analysis of the phase matching condition is carried out, and new types of three-wave interactions of magneto-Poincaré waves and magneto-Rossby waves are found. Three-wave interactions are studied and instabilities of the decay and amplification type are investigated.

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Song, Jian, et ShaoXia Liu. « The barotropic Rossby waves with topography on the earth’s δ-surface ». International Journal of Nonlinear Sciences and Numerical Simulation 21, n^o 7-8 (18 novembre 2020) : 781–88. http://dx.doi.org/10.1515/ijnsns-2019-0178.

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AbstractThe Rossby solitary waves in the barotropic vorticity model which contains the topography on the earth’s δ-surface is investigated. First, applying scale analysis method, obtained the generalized quasi-geostrophic potential vorticity equation (QGPVE). Using The Wentzel–Kramers–Brillouin (WKB) theory, the evolution equation of Rossby waves is the variable-coefficient Korteweg–de Vries (KdV) equation for the barotropic atmospheric model. In order to study the Rossby waves structural change to exist in some basic flow and topography on the δ-surface approximation, the variable coefficient of KdV equation must be explicitly, Chebyshev polynomials is used to solve a Sturm-Liouville-type eigenvalue problem and the eigenvalue Rossby waves, these solutions show that the parameter δ usually plays the stable part in Rossby waves and slow down the growing or decaying of Rossby waves with the parameter β.

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Dikpati, Mausumi, Peter A. Gilman, Gustavo A. Guerrero, Alexander G. Kosovichev, Scott W. McIntosh, Katepalli R. Sreenivasan, Jörn Warnecke et Teimuraz V. Zaqarashvili. « Simulating Solar Near-surface Rossby Waves by Inverse Cascade from Supergranule Energy ». Astrophysical Journal 931, n^o 2 (1 juin 2022) : 117. http://dx.doi.org/10.3847/1538-4357/ac674b.

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Abstract Rossby waves are found at several levels in the Sun, most recently in its supergranule layer. We show that Rossby waves in the supergranule layer can be excited by an inverse cascade of kinetic energy from the nearly horizontal motions in supergranules. We illustrate how this excitation occurs using a hydrodynamic shallow-water model for a 3D thin rotating spherical shell. We find that initial kinetic energy at small spatial scales inverse cascades quickly to global scales, exciting Rossby waves whose phase velocities are similar to linear Rossby waves on the sphere originally derived by Haurwitz. Modest departures from the Haurwitz formula originate from nonlinear finite amplitude effects and/or the presence of differential rotation. Like supergranules, the initial small-scale motions in our model contain very little vorticity compared to their horizontal divergence, but the resulting Rossby waves are almost all vortical motions. Supergranule kinetic energy could have mainly gone into gravity waves, but we find that most energy inverse cascades to global Rossby waves. Since kinetic energy in supergranules is three or four orders of magnitude larger than that of the observed Rossby waves in the supergranule layer, there is plenty of energy available to drive the inverse-cascade mechanism. Tachocline Rossby waves have previously been shown to play crucial roles in causing seasons of space weather through their nonlinear interactions with global flows and magnetic fields. We briefly discuss how various Rossby waves in the tachocline, convection zone, supergranule layer, and corona can be reconciled in a unified framework.

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KALADZE, T. D., D. J. WU, O. A. POKHOTELOV, R. Z. SAGDEEV, L. STENFLO et P. K. SHUKLA. « Rossby-wave driven zonal flows in the ionospheric E-layer ». Journal of Plasma Physics 73, n^o 1 (février 2007) : 131–40. http://dx.doi.org/10.1017/s0022377806004351.

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Abstract.A novel mechanism for the generation of large-scale zonal flows by small-scale Rossby waves in the Earth's ionospheric E-layer is considered. The generation mechanism is based on the parametric excitation of convective cells by finite amplitude magnetized Rossby waves. To describe this process a generalized Charney equation containing both vector and scalar (Korteweg–de Vries type) nonlinearities is used. The magnetized Rossby waves are supposed to have arbitrary wavelengths (as compared with the Rossby radius). A set of coupled equations describing the nonlinear interaction of magnetized Rossby waves and zonal flows is obtained. The generation of zonal flows is due to the Reynolds stresses produced by finite amplitude magnetized Rossby waves. It is found that the wave vector of the fastest growing mode is perpendicular to that of the magnetized Rossby pump wave. Explicit expression for the maximum growth rate as well as for the optimal spatial dimensions of the zonal flows are obtained. A comparison with existing results is carried out. The present theory can be used for the interpretation of the observations of Rossby-type waves in the Earth's ionosphere.

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Thèses sur le sujet "Rossby waves"

Cotto, Amaryllis. « Intermittently Forced Vortex Rossby Waves ». FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/553.

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Wavelike spiral asymmetries are an intriguing aspect of Tropical Cyclone dynamics. Previous work hypothesized that some of them are Vortex Rossby Waves propagating on the radial gradient of mean–flow relative vorticity. In the Intermittently Forced Vortex Rossby Wave theory, intermittent convection near the eyewall wind maximum excites them so that they propagate wave energy outward and converge angular momentum inward. The waves’ energy is absorbed as the perturbation vorticity becomes filamented near the outer critical radii where their Doppler–shifted frequencies and radial group velocities approaches zero. This process may initiate outer wind maxima by weakening the mean–flow just inward from the critical radius. The waves are confined to a relatively narrow annular waveguide because of their slow tangential phase velocity and the narrow interval between the Rossby wave cut–off frequency, where the radial wavenumber is locally zero, and the zero frequency, where it is locally infinite.

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Proehl, Jeffrey A. « Equatorial wave-mean flow interaction : the long Rossby waves / ». Thesis, Connect to this title online ; UW restricted, 1988. http://hdl.handle.net/1773/10960.

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Murphy, Darryl Guy. « Rossby waves in the Southern Ocean ». Thesis, University of Exeter, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303178.

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Wood, R. G. « Rossby waves in mid-latitude oceans ». Thesis, University of Essex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379474.

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Kovalam, Sujata. « MF radar observations of tides and planetary waves ». Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phk878.pdf.

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Copies of previously published articles inserted. Bibliography: p. 185-200. Data obtained from six radar stations covering a wide latitude range has been used to determine the global distribution of planetary waves and tides. In the process a number of data analyses techniques were considered for their characterisation.

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Fyfe, John. « A barotropic stability study of free and forced planetary waves / ». Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75433.

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The stability of free and forced planetary waves in a $ beta$-channel is investigated with a barotropic model. The forced waves at equilibrium result from a constant mean-zonal wind interacting with a finite-amplitude topography.
The frequencies of all infinitesimal perturbations to the equilibrium flows are determined numerically as a function of the flow parameters. The results are interpreted using a truncated spectral model and related to those of previous studies with infinite $ beta$-planes. In contrast to some earlier analytical studies we find that unstable long waves $(L sb{x}$ $>$ $L sb{y})$ exist under superresonant conditions. We also report on the existence of an interesting travelling topographic instability.
The linear instability of a weakly non-zonal flow is investigated numerically and analytically (via WKB theory). The theory reproduces the qualitative nature of the numerically-determined fastest-growing mode.
Nonlinear integrations, involving many degrees of freedom, reveal that initially-infinitesimal disturbances may grow explosively to finite-amplitude. The longer-term integrations are interpreted using a statistical mechanical model.

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Giannitsis, Constantine 1971. « Non-linear saturation of vertically propagating Rossby waves ». Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/53043.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, February 2001.
Includes bibliographical references (p. 203-208).
Linear quasi-geostrophic theory predicts an exponential amplitude increase with height for Rossby waves propagating vertically through a stratified atmosphere, as a result of wave activity density conservation. At the same time layer-wise conservation of potential enstrophy constrains wave amplitudes, given the limited amount of potential enstrophy available in the initial mean flow. A break down of linear theory is thus expected above a certain critical wave amplitude, raising the question of how the non-linear flow reacts to limit the vertical penetration of waves. Keeping in mind the potential importance for the dynamics of the winter stratosphere, where strong wave penetration and amplitude growth are often observed, the issue of wave saturation in a non-linear flow is examined in a generally abstract context, through a variety of simple model studies. We thus consider the cases of a topographically forced barotropic beta plane channel model, of vertical propagation through a three-dimensional beta plane channel model, and of a polar coordinate model with realistic basic state and geometry. In the barotropic model transient wave growth is forced through the use of bottom topography and the deviations of the non-linear flow evolution from the predictions of both a linear and a quasi-linear analytical solution are examined for strong topographic anomalies. The growth of the forced wave is found to decelerate the zonal mean flow which in turn reduces the topographic forcing. Wave-mean flow interactions are thus found to be sufficient in leading to saturation of the eddy amplitudes. Interestingly it is the formation of zonal mean easterlies, rather than the depletion of mean available potential enstrophy, that is found to be the crucial factor in the saturation dynamics. Similar results are obtained for the case of vertical propagation through a three dimensional beta plane channel. The vertical penetration of the forced wave is shown to cause a reduction of the zonal mean winds and mean potential vorticity gradients in the center of the channel, eventually leading to the formation of either a critical line or a refractive index turning surface. In both cases the penetration of the wave to high altitudes is prohibited, thus constraining wave amplitudes. While signs of non-linear behaviour are clear in synoptic maps of potential vorticity, wave-wave interactions are found to play a secondary role in the saturation process. The results of the three-dimensional beta plane channel model are then extended to a more realistic set-up, using a polar coordinate model with a basic state based on the observed winter stratosphere climatology. The basic conclusions of the idealized study are shown to remain unchanged.
by Constantine Giannitsis.
Ph.D.

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Ash, Ellis R. « Rossby waves and mean currents in the Southern Ocean ». Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/11542.

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Dynamics in the Southern Ocean are dominated by the Antarctic Circumpolar Current (ACC), and this large eastward current has an important influence on the earth's climate. Output from the last six years of the Fine Resolution Antarctic Model, where the mean flow is known, is used to develop techniques for quantifying Rossby waves and eddy activity. Some eastward jets in the mean flow are found to act as waveguides for Rossby waves. Phase speeds are found to increase linearly with frequency, but do not vary with the strength of mean flow. The reason for this is demonstrated using the dispersion relation, but it is shown that Rossby waves cannot be used to measure mean flows in the ACC without a further understanding of the theory involved. A property of the time-average eddy activity, known as the eddy orientation angle, is shown to indicate the axes of the prominent eastward jets in the mean flow. This shows that eddies are acting to force these jets. Five yeas of measurements from the TOPEX/POSEIDON satellite mission are used to identify Rossby waves in the real ocean. Coherent Rossby wave propagation is again confined to localised regions, some of which act as waveguides. Phase speeds are measured in these regions, and shown to be consistent with previous measurements of Rossby waves. An improved resolution dataset, combining TOPEX/POSEIDON and ERS altimetry measurements, is used to analyse the time-average eddy activity and associated forcing on the mean flow in unprecedented detail. Current data from cruises of the World Ocean Circulation Experiment are used in conjunction with altimetry data to estimate the mean flow at locations along ship tracks. Using these estimates, and the position of temperature fronts as an indication of prominent jets in the mean flow, the eddy forcing is shown to be different to that observed in FRAM. Instead of forcing the mean flow, eddies are being generated within the jets which are likely to be maintained by topographic forcing.

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Yang, Gui-Ying. « Propagation of nonstationary Rossby waves and extratropical-tropical interaction ». Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.646005.

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The propagation of Rossby waves with positive and negative frequency, corresponding to eastward and westward phase speeds respectively, is investigated. The techniques used are theoretical analysis, ray tracing, and initial value problems in barotropic and baroclinic numerical models. It is found that the characteristics of positive and negative frequency Rossby waves can differ significantly from each other andfrom those of stationary, zero frequency Rossby waves. However, general deductions from studies of stationary Rossby waves are still found to be valid. Using an analytic Gill-type model and a dry primitive equation model with only idealised vorticity or thermal forcing, a possible trigger mechanism for the Madden Julian Oscillation (MJO) has been studied. The results show that eastward moving forcing in the subtropics or extratropics can lead to a significant equatorial Kelvin wave response which tends to be a maximum in the African/Indian Ocean sector, and is enhanced by easterly winds in the upper troposphere. It is suggested . that one mechanism for initiating the MJO is for eastward moving extratropical waves to excite a large equatorial response, sufficient to trigger large-scale convection, in the presence of favourable easterly winds in the upper troposphere. The dry primitive equation model is used to study the possible interaction of atmospheric flow in the two hemispheres and the triggering of other equatorial waves. It is found that stationary and westward moving forcing in the Northern Hemisphere extratropics can give a significant Southern Hemisphere response. A westward moving forcing in the subtropics, with a period of several days, can trigger the equatorial mixed Rossby-gravity and n=l Rossby waves. The zonal basic flow is found to have a significant effect on these equatorial wave responses.

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Jonsson, Eskil. « Modelling the Formation and Propagation of Orographic Rossby Waves ». Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325188.

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Orographic Rossby waves are the main mechanism by which the jet streams meander aroundthe Earth and have possibly far-reaching impacts on weather and climate (chapter 1). Hence,they are of particular importance to study and this project should serve as a starting point inwhat to consider when trying to model these waves. For example, we have to account forpressure gradients, Coriolis effect, orography, potential vorticity conservation and also Earth’scurvature at this scale. These are covered in detail in ch. 2 and adapted to the Shallow WaterEquations. In addition, some entry-level numerical techniques for solving these equations arepresented throughout ch. 2.4 and then implemented for the global-scale Shallow WaterEquations with conserved potential vorticity in ch. 3. The model is validated to work for typicalshallow water flows in a bath tub and passes common tests like the Gaussian curve test (ch.4.1). However, when considering atmospheric flows (ch. 4.2) it becomes evident that ourmodel, as well as our numerical methods are lacking and cannot reproduce Rossby waves ina stable manner. Hence, a heavily modified version of Hogan’s model (Hogan, n.d) isemployed with a simplified numerical scheme. With these corrections, orographic Rossbywaves appear to naturally form at appropriate locations. However, they do not fully exhibit theexpected behaviours discussed in ch. 2.2. Even Hogan’s model appears to have severelimitations as waves propagate in the wrong direction. Hence, this study is not complete andwarrants further development in order to be useful.
Orografiska Rossby-vågor är den huvudsakliga mekanismen genom vilken jetströmmarnaslingrar runt jorden och kan ha en omfattande inverkan på väder och klimat (kapitel 1). Därförär de av särskild betydelse att studera och detta projekt bör fungera som en utgångspunkt förvad man måste överväga när man försöker modellera dessa vågor. Till exempel så måste vi tahänsyn till tryckgradienter, Coriolis-effekten, orografi, potentiell vorticitetsbevarande och ävenjordens krökning på denna skala. Dessa beskrivs i detalj i kap. 2 och anpassas tillrörelseekvationerna för grunt vatten (Saint-Venant-ekvationerna). Därefter presenteras någranumeriska tekniker på grundläggande nivå för att lösa dessa ekvationer i kap. 2.4, varvid desedan implementeras för de globala Saint-Venant-ekvationerna med bevarad potentiellvorticitet i kap 3. Modellen är validerad för typiska grunda vattenflöden i ett badkar ochpasserar vanliga numeriska tester så som Gauss-kurvtestet (kap. 4.1) och bore-testet. Mennär vi överväger atmosfäriska flöden (kap. 4.2) blir det tydligt att våra modeller och numeriskametoder är primitiva och inte kan reproducera Rossby-vågor på ett stabilt sätt. Därmed,modifierar vi Hogans modell (Hogan, n.d) för att passa vår modell vilket resulterar orografiskaRossby-vågor. Dock så är dessa förskjutna och stämmer inte riktigt överens med teorin i kap.2.2. Även Hogans modell visar sig ha allvarliga begränsningar då vågorna propagerar i felriktning. Därmed är denna studie ej komplett och kräver ytterligare utveckling för att varaanvändbar.

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Livres sur le sujet "Rossby waves"

United States. National Aeronautics and Space Administration., dir. Waves and instability in the atmosphere of Mars : Final report, July 1, 1987 - December 31, 1990. [Washington, DC : National Aeronautics and Space Administration, 1990.

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John, Stanford. Rossby-gravity waves in tropical total ozone data. [Washington, DC : National Aeronautics and Space Administration, 1993.

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John, Stanford. Rossby-gravity waves in tropical total ozone data. [Washington, DC : National Aeronautics and Space Administration, 1993.

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R, Ziemke J., et United States. National Aeronautics and Space Administration., dir. Rossby-gravity waves in tropical total ozone data. [Washington, DC : National Aeronautics and Space Administration, 1993.

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Volland, Hans. Atmospheric tidal and planetary waves. Dordrecht : Kluwer Academic Publishers, 1988.

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Chiu, Ching-Sang. Estimation of planetary wave parameters from the data of the 1981 Ocean Acoustic Tomography Experiment. Woods Hole, Mass : Woods Hole Oceanographic Institution, 1985.

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R, Reiter Elmar, et United States. National Aeronautics and Space Administration., dir. Atmospheric planetary wave response to external forcing : Final technical report, NASA grant NAG 5-136. [Washington, D.C : National Aeronautics and Space Administration, 1985.

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United States. National Aeronautics and Space Administration., dir. Large-scale dynamics and transport in the stratosphere. [Washington, D.C : National Aeronautics and Space Administration, 1990.

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United States. National Aeronautics and Space Administration., dir. Large-scale dynamics and transport in the stratosphere. [Washington, D.C : National Aeronautics and Space Administration, 1990.

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Chapitres de livres sur le sujet "Rossby waves"

Zeytounian, Radyadour. « Rossby Waves ». Dans Asymptotic Modeling of Atmospheric Flows, 44–62. Berlin, Heidelberg : Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-73800-5_4.

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Monin, A. S. « Rossby Waves ». Dans Theoretical Geophysical Fluid Dynamics, 237–75. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1880-1_7.

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Pedlosky, Joseph. « Rossby Waves ». Dans Waves in the Ocean and Atmosphere, 149–58. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05131-3_14.

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Kamenkovich, V. M., M. N. Koshlyakov et A. S. Monin. « Theory of Rossby Waves ». Dans Synoptic Eddies in the Ocean, 34–130. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4502-9_2.

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Pedlosky, Joseph. « Rossby Waves (Continued), Quasi-Geostrophy ». Dans Waves in the Ocean and Atmosphere, 159–71. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05131-3_15.

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Dolzhansky, Felix V. « The Obukhov–Charney Equation ; Rossby Waves ». Dans Fundamentals of Geophysical Hydrodynamics, 61–70. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31034-8_7.

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Skiba, Yuri N. « Stability of Rossby-Haurwitz (RH) Waves ». Dans Mathematical Problems of the Dynamics of Incompressible Fluid on a Rotating Sphere, 109–33. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65412-6_5.

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Boyd, John P. « Kelvin, Yanai, Rossby and Gravity Waves ». Dans Dynamics of the Equatorial Ocean, 35–67. Berlin, Heidelberg : Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-55476-0_3.

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Pedlosky, Joseph. « Energy and Energy Flux in Rossby Waves ». Dans Waves in the Ocean and Atmosphere, 173–82. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05131-3_16.

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Sardeshmukh, Prashant, Cécile Penland et Matthew Newman. « Rossby waves in a stochastically fluctuating medium ». Dans Stochastic Climate Models, 369–84. Basel : Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8287-3_17.

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Actes de conférences sur le sujet "Rossby waves"

Zaqarashvili, T. V., et Ivan Zhelyazkov. « Rossby Waves in Rotating Magnetized Fluids ». Dans SPACE PLASMA PHYSICS : School of Space Plasma Physics. AIP, 2009. http://dx.doi.org/10.1063/1.3137937.

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Sukoriansky, Semion, Nadejda Dikovskaya, Roger Grimshaw et Boris Galperin. « Rossby waves and zonons in zonostrophic turbulence ». Dans WAVES AND INSTABILITIES IN SPACE AND ASTROPHYSICAL PLASMAS. AIP, 2012. http://dx.doi.org/10.1063/1.3701355.

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Chen, Y. N., U. Haupt, U. Seidel et M. Rautenberg. « Experimental Investigation of the Longitudinal-Vortex-Nature of Rotating Stall in Vaneless Diffusers of Centrifugal Compressors ». Dans ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-099.

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Rotating stall in a vaneless diffuser of a centrifugal compressor has been found to be guided by Rossby waves, which are composed of branches of high and low pressures (Chen, Haupt and Rautenberg, 1990a). The branch of the high pressure leads the unstalled region and that of the low pressure leads the stalled region. The phase velocity of the Rossby waves is then the pattern speed of the stall cell. We report here an additional experimental result, according to which the flow of rotating stall is composed of a longitudinal spiral vortex pair. The vorticity and the axis of the longitudinal vortex were measured by means of two pressure transducers fixed at a distance of 2 mm to the opposite walls of the diffuser downstream of its inlet. The analysis of the experimental result of Tsurusaki, Imaichi and Miyake (1987) about the fields of the total and fluctuating velocities of rotating stall in the vaneless diffuser reveals furthermore that the longitudinal spiral vortex is centred on the through flow. The two vortices of the pair stay side by side in touch but without mixing because of their opposite rotational sense. The longitudinal vortices make about 1 1/4 turns from the inlet to the outlet of the diffuser under the guidance of the Rossby waves. The vorticity of the longitudinal vortex is determined from the experimental result. Furthermore, the experimental result reveals that the fronts along the high pressure ridges and the low pressure troughs of the Rossby wave pattern are themselves longitudinal vortices. Then these fronts possess a behaviour of the jet stream, which is associated with the Rossby waves of the atmosphere in the midlatitude. Finally, the origin of the vorticity of the longitudinal vortices along the through flow and the Rossby-wave front is derived based on the experimental results obtained by Hergt and Jaberg (1988), and Hide (1958).

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Shevkar, Prafulla P., Anoop M V, Philippe Odier et Manikandan Mathur. « Video : Experimental visualization of Rossby waves as transport barriers ». Dans 76th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2023. http://dx.doi.org/10.1103/aps.dfd.2023.gfm.v0009.

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Campbell, L. J. « Nonlinear dynamics of Rossby waves in a western boundary current ». Dans ADVANCES IN FLUID MECHANICS 2006. Southampton, UK : WIT Press, 2006. http://dx.doi.org/10.2495/afm06045.

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Chu, Peter C., et Chin-Lung Fang. « Observed Rossby waves in the South China Sea from satellite altimetry data ». Dans Remote Sensing, sous la direction de Charles R. Bostater, Jr. et Rosalia Santoleri. SPIE, 2004. http://dx.doi.org/10.1117/12.509064.

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del-Castillo-Negrete, D., J. M. Finn et D. C. Barnes. « The modified drift-Poisson model : Analogies with geophysical flows and Rossby waves ». Dans Non-neutral plasma physics III. AIP, 1999. http://dx.doi.org/10.1063/1.1302113.

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KALADZE, T. D., D. J. WU, O. A. POKHOTELOV, R. Z. SAGDEEV, L. STENFLO et P. K. SHUKLA. « ZONAL FLOW GENERATION BY MAGNETIZED ROSSBY WAVES IN THE IONOPHERIC E-LAYER ». Dans Proceedings of the 12th Regional Conference. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812770523_0026.

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Morey, Steve, Dmitry Dukhovskoy et Cortis K. Cooper. « SS : Metocean : Measurements and Modeling Measurements of Topographic Rossby Waves along the Sigsbee Escarpment ». Dans Offshore Technology Conference. Offshore Technology Conference, 2010. http://dx.doi.org/10.4043/20694-ms.

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Dai, Yuqiang, Fengxia Liu, Jintao Wu, Wei Wei, Dapeng Hu et Xuewu Liu. « Influence of Skewing of Contact Face on Performance of Wave Rotor Refrigerators and Superchargers ». Dans ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63449.

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As a novel generation of rotational gas wave machines, wave rotor machines such as wave rotor refrigerators (WRR) and wave rotor superchargers (WRS) are unsteady flow devices. In their passages two gas streams (with different pressure or even different phases) comes into direct contact can exchange energy due to the movement of shock waves and expansion waves. A detailed study shows that, when rotor channels open to the high pressure port gradually, the contact face in rotor channels inevitably skews, which is always accompanied with reflection of shockwaves. This causes very large energy dissipation and influences adversely on the refrigeration performance of WRR or the supercharging performance of WRS. In this work, factors such as centrifugal forces, Coriolis forces, gradual channel opening and gradual channel closing, etc, which influence the wave transportation and skewing of shock waves and contact faces are studied by means of computational fluid dynamics and experiments. The skewing of contact faces causes uneven distribution of velocity and large local loss. With rotation Mach number smaller than 0.3, the skewing of contact face can be alleviated. To reduce the adverse influence of rotation Mach number, a smaller rotor channel width or higher rotational speed is necessary. The rotation effect plays an important role for the skewing of gas discontinuities. Both the centrifugal and Coriolis forces of wave rotor cannot be ignored with the Rossby number of 1.3∼3.5. To reduce the skewing loss of contact face, a lower rotational speed seems necessary. The rotation speed of wave rotors has dialectical influences on the skewing of shock waves and contact faces. The jetting width of high pressure port is the key factor of the gradual opening of rotor channels. A feasible way to reduce skewing losses of gas waves is to optimize the ratio between high pressure port width and channel width. The validation experiments have got at least 3∼5% rise of isentropic efficiency for WRRs.

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Rapports d'organisations sur le sujet "Rossby waves"

Peng, Melinda S. Role of Vortex Rossby Waves on Tropical Cyclone Intensity. Fort Belvoir, VA : Defense Technical Information Center, septembre 2008. http://dx.doi.org/10.21236/ada532809.

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Peng, Melinda S. Role of Vortex Rossby Waves on Tropical Cyclone Intensity. Fort Belvoir, VA : Defense Technical Information Center, septembre 2007. http://dx.doi.org/10.21236/ada541436.

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Peng, Melinda S. Role of Vortex Rossby Waves on Tropical Cyclone Intensity. Fort Belvoir, VA : Defense Technical Information Center, septembre 2006. http://dx.doi.org/10.21236/ada631046.

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Montgomery, Michael T., et Lloyd J. Shapiro. Vortex Rossby Waves and Hurricane Evolution in the Presence of Convection and Potential Vorticity and Hurricane Motion. Fort Belvoir, VA : Defense Technical Information Center, septembre 1997. http://dx.doi.org/10.21236/ada628370.

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