Relevant bibliographies by topics / Singular jets

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Singular jets'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Singular jets"

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Brenner, Michael P. "Jets from a singular surface." Nature 403, no. 6768 (2000): 377–78. http://dx.doi.org/10.1038/35000330.

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Müller, Livia, and Hubert Chanson. "Singular air entrapment at vertical and horizontal supported jets: plunging jets versus hydraulic jumps." Environmental Fluid Mechanics 20, no. 4 (2020): 1075–100. http://dx.doi.org/10.1007/s10652-020-09742-w.

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HEINZ, SEBASTIAN. "CLUES FOR THE COMPOSITION OF RELATIVISTIC MICROQUASAR JETS." International Journal of Modern Physics D 17, no. 10 (2008): 1947–52. http://dx.doi.org/10.1142/s0218271808013613.

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We discuss the evidence for proton loading in relativistic jets from microquasars in light of recent constraints on the jet power. We argue that, both in the case of the Cygnus X-1 jet and the entire ensemble of Galactic microquasars, the evidence points towards a significant contribution to the total kinetic energy flux from cold protons. However, as with all other methods of constraining jet composition (except for the singular case of SS 433), a number of alternative, though maybe less plausible, explanations exist. In light of this continued elusiveness of a single slam-dunk argument for proton loading, the best we can hope for is a continuing accumulation of bits of evidence such as these which will, on the whole, form a preponderance of evidence against pure pair jets.
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Papageorgiou, Demetrios T. "Analytical description of the breakup of liquid jets." Journal of Fluid Mechanics 301 (October 25, 1995): 109–32. http://dx.doi.org/10.1017/s002211209500382x.

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A viscous or inviscid cylindrical jet with surface tension in a surrounding medium of negligible density tends to pinch owing to the mechanism of capillary instability. We construct similarity solutions which describe this phenomenon as a critical time is encountered, for three distinct cases: (i) inviscid jets governed by the Euler equations, (ii) highly viscous jets governed by the Stokes equations, and (iii) viscous jets governed by the Navier-Stokes equations. We look for singular solutions of the governing equations directly rather than by analysis of simplified models arising from slender-jet theories. For Stokes jets implicitly defined closed-form solutions are constructed which allow the scaling exponents to be fixed. Navier-Stokes pinching solutions follow rationally from the Stokes ones by bringing unsteady and nonlinear terms into the momentum equations to leading order. This balance fixes a set of universal scaling functions for the phenomenon. Finally we show how the pinching solutions can be used to provide an analytical description of the dynamics beyond breakup.
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Larchenkova, Tatiana, Alexander Lutovinov, and Natalya Lyskova. "The image jets modeling of gravitationally lensed sources." Proceedings of the International Astronomical Union 6, S275 (2010): 106–7. http://dx.doi.org/10.1017/s1743921310015760.

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AbstractThe jets image modelling of gravitationally lensed sources have been performed. Several basic models of the lens mass distribution were considered, in particular, a singular isothermal ellipsoid, an isothermal ellipsoid with the core, different multi-components models with the galactic disk, halo and bulge. The obtained jet images were compared as with each other as with results of observations. A significant dependence of the Hubble constant on the model parameters was revealed for B0218+357, when the circular structure was took into account.
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HEWITT, RICHARD E., and PETER W. DUCK. "Pulsatile jets." Journal of Fluid Mechanics 670 (January 12, 2011): 240–59. http://dx.doi.org/10.1017/s0022112010005227.

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We consider the evolution of high-Reynolds-number, planar, pulsatile jets in an incompressible viscous fluid. The source of the jet flow comprises a mean-flow component with a superposed temporally periodic pulsation, and we address the spatiotemporal evolution of the resulting system. The analysis is presented for both a free symmetric jet and a wall jet. In both cases, pulsation of the source flow leads to a downstream short-wave linear instability, which triggers a breakdown of the boundary-layer structure in the nonlinear regime. We extend the work of Riley, Sánchez-Sans & Watson (J. Fluid Mech., vol. 638, 2009, p. 161) to show that the linear instability takes the form of a wave that propagates with the underlying jet flow, and may be viewed as a (spatially growing) weakly non-parallel analogue of the (temporally growing) short-wave modes identified by Cowley, Hocking & Tutty (Phys. Fluids, vol. 28, 1985, p. 441). The nonlinear evolution of the instability leads to wave steepening, and ultimately a singular breakdown of the jet is obtained at a critical downstream position. We speculate that the form of the breakdown is associated with the formation of a ‘pseudo-shock’ in the jet, indicating a failure of the (long-length scale) boundary-layer scaling. The numerical results that we present disagree with the recent results of Riley et al. (2009) in the case of a free jet, together with other previously published works in this area.
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MALAZA, E. D. "ASYMPTOTIC SCALING IN QUARK AND GLUON JET MULTIPLICITY DISTRIBUTIONS IN NEXT-TO-LEADING ORDER QCD." International Journal of Modern Physics A 04, no. 18 (1989): 4909–18. http://dx.doi.org/10.1142/s0217751x89002077.

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GOLDSTEIN, M. E., and S. J. LEIB. "The aeroacoustics of slowly diverging supersonic jets." Journal of Fluid Mechanics 600 (March 26, 2008): 291–337. http://dx.doi.org/10.1017/s0022112008000311.

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This paper is concerned with utilizing the acoustic analogy approach to predict the sound from unheated supersonic jets. Previous attempts have been unsuccessful at making such predictions over the Mach number range of practical interest. The present paper, therefore, focuses on implementing the refinements needed to accomplish this objective. The important effects influencing peak supersonic noise are found to be source convection, mean flow refraction, mean flow amplification, and source non-compactness. It appears that the last two effects have not been adequately dealt with in the literature. For the first of these this is because the usual parallel flow models produce most of the amplification in the so-called critical layer where the solution becomes singular and, therefore, causes the predicted sound field to become infinite. We deal with this by introducing a new weakly non-parallel flow analysis that eliminates the critical layer singularity. This has a strong effect on the shape of the peak noise spectrum. The last effect places severe demands on the source models at the higher Mach numbers because the retarded-time variations significantly increase the sensitivity of the radiated sound to the source structure in this case. A highly refined (non-separable) source model is, therefore, introduced in this paper.
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Stevens, Martha R., and Gregory J. Hakim. "Perturbation Growth in Baroclinic Waves." Journal of the Atmospheric Sciences 62, no. 8 (2005): 2847–63. http://dx.doi.org/10.1175/jas3502.1.

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Abstract Floquet theory is applied to the stability of time-periodic, nonparallel shear flows consisting of a baroclinic jet plus a neutral wave. This configuration is chosen as an idealized representation of baroclinic waves in a storm track, and the stability analysis may be helpful for understanding generic properties of the growth of forecast errors in such regions. Two useful attributes of Floquet theory relevant to this problem are that the period-average mode growth rate is norm independent, and the t→ ∞ stability limit is determined by the stability over one period. Exponentially growing Floquet modes are found for arbitrarily small departures from parallel flows. Approximately 70% of Floquet-mode growth in energy is due to barotropic conversion, with the remainder due to zonal heat flux. Floquet-mode growth rates increase linearly with neutral wave amplitude (i.e., the “waviness” of the jet) and also increase with neutral wave wavelength. Growth rates for meridionally localized jets are approximately 40% smaller than for comparable cases with linear vertical shear (the Eady jet). Singular vectors for these flows converge to the leading Floquet mode over one basic-state period, and the leading instantaneous optimal mode closely resembles the leading Floquet mode. Initial-value problems demonstrate that the periodic basic states are absolutely unstable, with Floquet modes spreading faster than the basic-state flow both upstream and downstream of an initially localized disturbance. This behavior dominates the convective instability of parallel-flow jets when the neutral baroclinic wave amplitude exceeds a threshold value of about 8–10 K. This result suggests that forecast errors in a storm track may spread faster, and affect upstream locations, for sufficiently wavy jets.
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Marheineke, Nicole, Björn Liljegren-Sailer, Maike Lorenz, and Raimund Wegener. "Asymptotics and numerics for the upper-convected Maxwell model describing transient curved viscoelastic jets." Mathematical Models and Methods in Applied Sciences 26, no. 03 (2016): 569–600. http://dx.doi.org/10.1142/s021820251650010x.

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This work deals with the modeling and simulation of non-Newtonian jet dynamics as it occurs in fiber spinning processes. Proceeding from a three-dimensional instationary boundary value problem of upper-convected Maxwell equations, we present a strict systematic derivation of a one-dimensional viscoelastic string model by using asymptotic analysis in the slenderness ratio of the jet. The model allows for the unrestricted motion and shape of the jet’s curve, and its deduction extends the hitherto existing uniaxial asymptotic approaches. However, the system of partial differential equations with algebraic constraint has a varying character (hyperbolic, hyperbolic–elliptic, parabolic deficiency). Its applicability range turns out to be limited depending on the physical parameters and the boundary conditions (i.e. singular perturbation). Numerical results are discussed for the hyperbolic regime of gravitational inflow–outflow set-ups which become relevant in drawing and extrusion processes. The simulations are performed with a normal form total upwind scheme in space and an implicit time-integration ensuring convergence of first order.
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Dissertations / Theses on the topic "Singular jets"

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Zhou, Zhengquan. "A theory and analysis of planing catamarans in calm and rough water." ScholarWorks@UNO, 2003. http://louisdl.louislibraries.org/u?/NOD,45.

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Thesis (Ph.D)--University of New Orleans, 2003.<br>Title from electronic submission form. "A dissertation ... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Engineering and Applied Science"--Dissertation t.p. Vita. Includes bibliographical references.
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Tian, Yuansi. "Experiments on Drop-impact Splashing, Singular Jets and Coalescence in Emulsions." Diss., 2020. http://hdl.handle.net/10754/664909.

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This dissertation describes experiments on drop dynamics. It is split into two main parts: The first investigates the breakup of liquid during the impact of a drop on a pool surface, with focus on the smallest and fastest splashed satellite droplets. The second part studies the much slower coalescence of two minute water droplets in oil inside a micro-channel, with applications to separation of water droplets from crude oil emulsions. First, we study drop-on-liquid impacts in high-speed experiments with extreme time and spatial resolutions using up to 5 million frames-per-second video imaging. This is used to identify and explain two primary mechanisms which produce the smallest and fastest splashed secondary droplets, i.e. ejecta sheets and singular jets. Using a novel 25-m-tall vacuum tube we generate very large impact velocities, to reach regimes in parameter-space never studied before. During the earliest stage of the impact a fast-moving horizontal ejecta sheet emerges from the neck between drop and pool. The breakup of this sheet forms a myriad of micron-size droplets. The ejecta bending is dominated by air resistance, which we investigate under reduced ambient pressures and successfully model based on Bernoulli suction which pulls down the ejecta to hit the pool surface. The ejecta can initially bend up or down depending on the relative viscosities of the drop and pool, bending up if the pool is less viscous. Singular jets are produced by the collapse of drop-impact craters for deep pools, when a dimple forms at the bottom of the crater focusing the energy into a micron-sized region, with jetting velocities over 100 m/s. We use Gerris to study the fine details, obscured in the experiments. In the second part, we study the coalescence of water droplets inside an oil emulsion, developing an empirical relation between the coalescence interaction time tc and the modified shear-rate. This is done by tracking 3-D drop trajectories inside a microchannel, with two perpendicular high-speed cameras. For droplets in crude oil, we implement near-infrared visualization in an innovative device to quantify demulsifier efficiency, using mono-disperse micro-droplets.
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Books on the topic "Singular jets"

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The singular beast: Jews, Christians & the pig. Columbia University Press, 1997.

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Mitch, Ginsburg, ed. Second person singular. Grove Press, 2012.

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Réflexions nouvelles sur des questions juives: Du singulier à l'universel. Maisonneuve & Larose, 2007.

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Fejtö, François. Hongrois et Juifs: Histoire millénaire d'un couple singulier (1000-1997) : contribution à l'étude de l'intégration et du rejet. Balland, 1997.

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Second Person Singular. Grove Press, 2013.

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(Translator), Carol Volk, ed. The Singular Beast. Columbia University Press, 1999.

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Lazar, Hadara. Six Singular Figures : Understanding the Conflict: Jews and Arabs Under the British Mandate. Mosaic Press, 2015.

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Ansell, Joseph P. Arthur Szyk. Liverpool University Press, 2004. http://dx.doi.org/10.3828/liverpool/9781874774945.001.0001.

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Artist and illustrator Arthur Szyk was a Polish Jew whose work was overwhelmingly Jewish in theme and content. The mission he set himself was to use his artistic talents to serve humanity and the Jewish people. His work as a political artist went well beyond a narrow definition of the Jewish cause. He is best known among Jews for his illustrated Haggadah, but the majority of his work deals with contemporary political themes and social causes. In Poland, Szyk promoted the causes of freedom, toleration, and human dignity. He believed that as a Jewish artist he had a responsibility to speak for all minorities. He worked for years on behalf of the Polish government in an effort to strengthen the Jews' position. Szyk left Europe in 1940 and arrived in the United States later the same year. Determined to use his art for political purposes, he crusaded against the Nazis. Convinced that Hitler would not stop with the Jews but would suppress all freedom-loving people, he supported the war effort through his striking propaganda images of the German and Japanese armies, to great effect. After the war he turned his efforts to promoting the idea of a Jewish homeland in Israel. In every phase of his career, one finds Szyk looking to the past but hoping for the future; he believed that art could make a difference in the world, politically and socially. This biography makes a singular contribution to the history of Jewish art and of Polish–Jewish relations in the first half of the twentieth century.
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Temkin, Sefton D. Creating American Reform Judaism. Liverpool University Press, 1998. http://dx.doi.org/10.3828/liverpool/9781874774457.001.0001.

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Isaac Mayer Wise (1819–1900), founder of the major institutions of Reform Judaism in America, was a man of his time — a pioneer in a pioneer’s world. When he came to America from his childhood Bohemia in 1846, he found fewer than 50,000 Jews and only two ordained rabbis. With his sense of mission and tireless energy, he set himself to tailoring the vehicle of Reform Judaism to meet the needs of the growing Jewish community. Wise strove for unity among American Jews, and for a college to train rabbis to serve them. The establishment of Hebrew Union College (1875) was the crowning achievement of his life. His quest for unity also led him to draw up an American Jewish prayer-book, Minhag America, to found the Central Conference of American Rabbis, and to edit two weeklies; their editorials, breathing fire and energy, were no less important in his quest for leadership. Here as elsewhere, it was his persistence that won him the war where his impetuosity lost him many battles. This book captures the vigour of Wise’s personality and the politics and concerns of contemporary Jewish life and leadership in America. The biography is a lively portrait of a rabbi whose singular efforts in many fields made him a pivotal figure in the naturalization of the Jew and Judaism in the New World.
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Book chapters on the topic "Singular jets"

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Swaters, G. E. "Evolution of Near-Singular Jet Modes." In IUTAM Symposium on Advances in Mathematical Modelling of Atmosphere and Ocean Dynamics. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0792-4_34.

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Kuhnert, Frieder, and Rolf Haftmann. "Numerical Solution of Singular Integral Equations and an Application to the Theory of Jet-Flapped Wings." In Constructive Methods for the Practical Treatment of Integral Equations. Birkhäuser Basel, 1985. http://dx.doi.org/10.1007/978-3-0348-9317-6_17.

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"A Strangely Plural Singular." In The Jews and the Bible. Stanford University Press, 2020. http://dx.doi.org/10.1515/9780804793216-004.

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Geller, Jay. "The Jewish Animot: Of Jews as Animals." In Jews and the Ends of Theory. Fordham University Press, 2018. http://dx.doi.org/10.5422/fordham/9780823282005.003.0007.

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This chapter addresses the famous joke on “the elephant and the Jewish question,” whose prominence is attested by its many iterations not only in collections of Jewish jokes but also in works of philosophy and theory. Drawing together two seemingly unrelated terms such as Jews and elephants and pointing at their close proximity, jokes do not merely comment on the preposterous character of the “rumor about the Jews” that there is an inherent relationship between Jews and nonhuman animals. The joke also points to what escapes theory and calls out its limitations, for theory takes the Jew as well as the animal as categories, singular as they might be, that can be comprehended only vis-à-vis universals. The chapter then looks at how Jewish authors have called into question the human-nonhuman animal divide in their struggle to think through European modernity.
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Tomaszewski, Jerzy. "Żydzi." In Polin: Studies in Polish Jewry Volume 12. Liverpool University Press, 1999. http://dx.doi.org/10.3828/liverpool/9781874774594.003.0026.

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This chapter considers a series of books, A to Polska właśnie (This is Indeed Poland). These books introduce their readers to various issues of interest to anyone studying Polish society. The chapter focuses on the volume Żydzi (The Jews), in particular, as it is the first to discuss an important group among Poland's population. The volume covers the period up to the second half of the eighteenth century, political and social problems from the second half of the eighteenth century until the end of the nineteenth, Jewish culture and religion in the nineteenth century, the period from the First World War until 1939, the Holocaust, and Jews in Poland after the Second World War. The chapter contends that this book should be regarded not as just one more study about Polish Jews, but as making a singular contribution to the promotion of knowledge about Jewish traditions, culture, and history in Poland.
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Nancy, Jean-Luc, and Jeff Fort. "4." In The Banality of Heidegger. Fordham University Press, 2017. http://dx.doi.org/10.5422/fordham/9780823275922.003.0004.

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Heidegger’s anti-Semitism is “historial” because it attributes to the Jewish people a task that is both world-historical and philosophically significant, having to do with the uprooting of beings. Why, according to Heidegger’s logic, must this be attributed to the Jews, since the process described involves multiple agents? Because the Jews are the racialized people that brings about a “deracialization” of humanity, a levelling and equivalence in indifference. This process can be compared by analogy with Marx’s analysis of money as the general equivalent, and of the proletariat as the agent and figure of revolution. For Heidegger, the new beginning of humanity requires a figure, a type, embodied in a people capable of hastening the end. For every singular beginning requires a people, as does every end.
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Neyrat, Frédéric. "Theory of the Trans-ject." In Atopias, translated by Walt Hunter and Lindsay Turner. Fordham University Press, 2017. http://dx.doi.org/10.5422/fordham/9780823277551.003.0003.

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This chapter considers the problem of thinking singular existences as they are formed from the outside. Existence can only be encountered by the mechanism of the double advance, a dual motion that depends on the relations of existences in an existential field. In a central polyvocal section called “Coalitions,” the concept of the adventurous coalition is proposed to explain the creation of trans-jects, or subjective trajectories, through relation. This chapter also considers the implications of this new atopian trans-ject for both freedom and language. Finally, this chapter takes up the question of the trans-ject in the case of animals: Posing the subject as the repetition of an existential trans-ject, Neyrat argues, offers a way of thinking existence in its multiplicity, unpredictability, and eccentricity.
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Rapoport-Albert, Ada, and Marcin Wodziński. "Introduction." In Polin: Studies in Polish Jewry Volume 33. Liverpool University Press, 2021. http://dx.doi.org/10.3828/liverpool/9781906764753.003.0001.

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This chapter describes Hasidism’s former reputation as a singular exception to the scarcity of scholarship on the religious dimension of Jewish life in eastern Europe. It cites the nineteenth-century liberal critique of the movement, which contributed to the disproportionate prominence of Hasidism in the scholarly literature about the religious life of east European Jews. It also explains liberal critique that originated in the militantly anti-Hasidic posture adopted by the early nineteenth-century maskilim, which left a deep imprint on the modern school of Jewish historiography. The chapter talks about the Jewish communities of eastern Europe that were divided into the opposing camps: Hasidic and anti-Hasidic. It analyzes the dichotomy that placed the movement at the very heart of an embattled arena and had the subsequent effect of harnessing Hasidism to a wide range of ideologically driven historiographical constructs.
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Feinstein, Amy. "Pariah Modernism." In Gertrude Stein and the Making of Jewish Modernism. University Press of Florida, 2020. http://dx.doi.org/10.5744/florida/9780813066318.003.0005.

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Chapter 4 considers the solely-metaphorical presence of Jews in the final text of The Making of Americans. Paralleling the evolution found in Stein’s notebooks, the novel’s narrator largely abandons storytelling in lieu of character study. Stein replaces the Jewish and Anglo-Saxon character types from the notebooks with a purely behavioral nomenclature and, as a result, the published volume contains no explicit references to Jews. The narrator nonetheless maintains a focus on a categorically Jewish and modern type: the pariah. He introduces several pariah figures, from servant girls and parvenus to avant-garde writers, who join him in a fraternity of what he calls “Brother Singulars.” With an eye to Hannah Arendt’s notion of the modern Jewish visionary or “conscious pariah,” the chapter argues that Stein’s narrator, with the characterological “plot” he is writing for himself and strangers, estranges narration by increasingly abstracting his characterology with indefinite pronouns as the novel progresses. Amidst the formal experimentation of ever-increasing repetition and abstraction, the narrator’s Jewish pariahs recede into textual indistinguishability while still differentiating themselves from others. Through this association, Stein sets the agenda for ethical authorship in the modern era.
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Geller, Jay. "Italian Lizards and Literary Politics I." In Bestiarium Judaicum. Fordham University Press, 2017. http://dx.doi.org/10.5422/fordham/9780823275595.003.0006.

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This chapter undertakes a philology-inspired genealogy of Kafka’s invocation of an exemplary lizard on an Italian footpath in his critique of Max Brod’s novel The Jewesses, wherein Kafka remarks upon its failure to counter the everyday practice of identifying Jewish individuals by the undifferentiated collective singular of “the Jew.” Against assumptions about allegedly common identifications of Jews and lizards and consequent allegations of Kafka’s abjection of Judentum, as in Judith Butler’s cavalier tossing of Kafka’s “lizard” into the pickle barrel of contemporary identity politics and the question of Israel-Palestine, this chapter first situates Kafka’s invocation within his actual encounters with lizards in Italy. It then constellates contemporary ressentiment-laden literary politics and Jewish-Gentile relations through the allusive mediations of Brod’s editing of Kafka’s diary and of Karl Kraus and his vicious denunciation of “Heine and the Consequences.” It then turns to two other possible influences on Kafka’s figuration: Goethe’s encounters with lizards during his Italian Journey and Heine’s in the opening chapters of The City of Lucca in his Travel Pictures. Combining allusions to Eduard Gans and Benedict Spinoza with various physical, genealogical, and mental traits Heine’s construction of the lizards may well be, as the Jew-as-Animal, articulating the Jewish animot.
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Conference papers on the topic "Singular jets"

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LePera, S. D., and U. Vandsburger. "On the Coupling Between Adjacent Turbulent Jets." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31061.

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A detailed examination of the coupling observed between adjacent turbulent jets, one of which was externally excited, is presented. The study is relevant to the active control of combustion and mixing devices; applications which demand maximum reliability and minimal power consumption by their active elements. To this end, it is desirable for each active component to affect several simple, non-active components in the system. An initial study of three collinear turbulent air jets was seen to enhance the mixing of adjacent, unforced jets with ambient fluid by 15–20%. The work presented here examines this phenomena using quantitative PLIF mixing measurements, three component and single-wire velocity measurements, qualitative flow visualization, and reduced singular value decomposition (SVD). This analysis of the data shows that the mixing improvement in the adjacent, unforced jets is primarily due to the low level perturbation at the exit of the unforced jets induced by the periodic forcing in the active center jet. This improved mixing is shown to be a result of amplification of the +/-1 spatial mode. Large scale structures in the central, forced jet are shown not to effect the behavior of the adjacent jets.
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Berger, Phillip A., and James A. Liburdy. "A Near-Field Investigation Into the Effects of Geometry and Compound Angle on the Flowfield of a Row of Film Cooling Holes." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-279.

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The goal of this study was to determine the effects that hole geometry and compound angle have on the near-field downstream from a row of jets injected into a crossflow. Velocity and vorticity fields are presented in cross-sectional planes oriented perpendicular to the mainstream flow. Instantaneous field measurements were obtained using particle image velocimetry (PIV). Data were recorded at locations of 0, 1, 2, and 3.5 hole diameters downstream of injection for three different hole geometries inclined at 35° to the mainstream flow. These geometries consisted of a cylindrical hole, a 12° laterally-diffused hole, and a 15° forward-expanded hole with compound angles of 0°, 45°, 60°, and 90. Data are presented for a blowing ratio of 1.25 and density ratio of 1. The influences on jet penetration, coverage width, flow structure elevation, and flow structure separation for each configuration are discussed. Vorticity is presented in terms of field distribution and peak magnitudes. These studies show the degradation of the counter-rotating vortex pair into a singular, recirculating structure as the compound angle increases. Peak levels of vorticity are not encountered until between one and two diameters downstream of injection.
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Josserand, Christophe. "The Dynamics of Drop Impact." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31444.

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Inkjet printing, rainfall, droplet collision in combustion chambers are different forms of drop impacts. The whole dynamics of these impacts is complex and remains far to be fully understood. In particular the role of the viscosity of the drop liquid is still hard to exhibit. In one hand, the early time of the impact should be considered inviscid, and viscous free calculation give a fair approximation of the short time dynamics. On the other hand, experimental evidences show that the transition between splashing dynamics and deposition is controlled by a so-called splashing parameter K = We · sqrt(Re), where the viscosity enter through the Reynolds number Re (We being the Weber number). Therefore the role of the viscosity for the early time of the impact needs to be elucidated. We will present numerical simulations of the impact of a drop on a liquid layer thanks to a volume of fluid technique (VOF), where the Navier-Stokes equations are solved for both liquid and gas phases. For a given Weber number, we will vary only the viscosity so that viscous effects can be emphasized. The calculation will also determine the relative spreading of the drop inside the liquid layer. For splashing behaviors, a jet is emitted soon after the initiation of the impact; contrarily, no jets are present when deposition happens. The pressure field and the velocity field are studied near the neck of the impact and show no specific dependance on the viscosity. However, viscous effects are observed through the diffusion of the vorticity from the interface into the liquid bulk. Therefore, the viscous length lv = sqrt(vt) controls the gradient fields at the impact and we observe that the width of the emitted jet is determined by this length. Therefore, applying mass conservation to a dynamical solution where a jet of width lv is created, we can estimate the balance between mass ejected by the falling drop with mass coming from a retracting jet. The growth of a jet is thus controlled by this mass balance and the splashing parameter law is retrieved. In particular, the viscous effects appear in the theory as a singular perturbation of the inviscid impact dynamics. Self-similar solutions of the impact are therefore considered in specific gometries. More information at http://www.lmm.jussieu.fr/MEMBRES/JOSSERAND/josserand.html.
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Yu, Roger Ho Zhen, Mohd Azmi bin Ismail, Muhammad Iftishah Ramdan, and Nur Musfirah binti Mustaffa. "Experimental study of cooling performance of pneumatic synthetic jet with singular slot rectangular orifice." In ENGINEERING INTERNATIONAL CONFERENCE (EIC) 2016: Proceedings of the 5th International Conference on Education, Concept, and Application of Green Technology. Author(s), 2017. http://dx.doi.org/10.1063/1.4976936.

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Lu, Tianfeng, Chun Yoo, Jacqueline Chen, and Chung Law. "Analysis of a Turbulent Lifted Hydrogen/Air Jet Flame from Direct Numerical Simulation with Computational Singular Perturbation." In 46th AIAA Aerospace Sciences Meeting and Exhibit. American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-1013.

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Rajeev, P. T., H. Murthy, and T. N. Farris. "Load History Effects on Fretting Contacts of Isotropic Materials." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30297.

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The load history that blade/disk contacts in jet engine attachment hardware are subject to can be very complex. Using Finite Element Method (FEM) to track changes in the contact tractions due to changing loads can be computationally very expensive. For 2D plane strain contact problems with friction involving similar/dissimilar isotropic materials, the contact tractions can be related to the initial gap function and the slip function using coupled Cauchy Singular Integral Equations (SIEs). The effect of load history on the contact tractions is illustrated by presenting results for an example fretting “mission”. For the case of dissimilar isotropic materials the misson results show the effect of the coupling between the shear traction and the contact pressure.
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Henriksson, M., S. Borguet, O. Le´onard, and T. Gro¨nstedt. "On Inverse Problems in Turbine Engine Parameter Estimation." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27756.

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This paper extends previous work on model order reduction based on singular value decomposition. It is shown how the decrease in estimator variance must be balanced against the bias on the estimate inevitably introduced by solving the inverse problem in a reduced order space. A proof for the decrease in estimator variance by means of multi-point analysis is provided. The proof relies on comparing the Cramer-Rao lower bound of the single point and the multi-point estimators. Model order selection is discussed in the presence of a varying degree of a priori parameter information, through the use of a regularization parameter. Simulation results on the SR-30 turbojet engine indicate that the theoretically attainable multi-point improvements are difficult to realize in practical jet engine applications.
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Chamoun, George C., Eva Kanso, and Paul K. Newton. "Single Vortex Streets on the Sphere." In ASME 2008 Dynamic Systems and Control Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/dscc2008-2401.

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We study arrangements of point vortices on a sphere in the form of a single von Ka´rma´n vortex street, with and without the addition of pole vortices using the configuration matrix approach recently introduced by (1) and (2) on the sphere. We derive the general form of the von Ka´rma´n matrix thereby obtaining all possible vortex strengths for which the configuration rotates rigidly, perpendicular to the axis of rotation of the sphere. The distribution of normalized singular values of the von Ka´rma´n matrices allows us to calculate their Shannon entropy (as a function of the vortex street parameters), which we interpret as a scalar measure of ‘disorder’ and robustness of the vortex street. We also study the streamline topologies associated with the vortex street and identify a number of distinct topologies which support a jet-stream passing through the street capable of transporting particles globally.
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