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 Subjects -> PHILOSOPHY (Total: 396 journals)
 'Ilu. Revista de Ciencias de las Religiones       (Followers: 2) ACME : Annali della Facoltà di Studi Umanistici dell'Università degli Studi di Milano Agone Aisthema, International Journal Aisthesis Aisthesis. Pratiche, linguaggi e saperi dell’estetico       (Followers: 1) Al-Jami'ah : Journal of Islamic Studies       (Followers: 5) Algemeen Nederlands Tijdschrift voor Wijsbegeerte Alpha (Osorno) American Journal of Theology & Philosophy       (Followers: 27) American Society for Aesthetics Graduate E-journal       (Followers: 3) Analecta Hermeneutica Anales del Seminario de Historia de la Filosofía Análisis filosófico Analysis       (Followers: 15) Analytic Philosophy       (Followers: 11) Annales UMCS. Sectio I (Filozofia, Socjologia) Annali del Dipartimento di Filosofia       (Followers: 1) Annuaire du Collège de France       (Followers: 2) Anthropological Measurements of Philosophical Research Apuntes Universitarios       (Followers: 1) Araucaria. Revista Iberoamericana de Filosofía, Política y Humanidades       (Followers: 1) Archai : revista de estudos sobre as origens do pensamento ocidental Archiv fuer Rechts- und Sozialphilosphie       (Followers: 2) Archiv für Geschichte der Philosophie       (Followers: 4) Areté : Revista de Filosofia Argos       (Followers: 2) Assuming Gender       (Followers: 3) Astérion       (Followers: 2) Australasian Catholic Record, The       (Followers: 5) Australasian Journal of Philosophy       (Followers: 218) Australian Humanist, The       (Followers: 2) Australian Journal of Parapsychology       (Followers: 1) Axiomathes       (Followers: 4) Between the Species       (Followers: 2) Bijdragen       (Followers: 1) Bioethics Research Notes       (Followers: 11) BioéthiqueOnline       (Followers: 1) Biology and Philosophy       (Followers: 12) Bochumer Philosophisches Jahrbuch für Antike und Mittelalter       (Followers: 2) Bollettino Filosofico British Journal for the History of Philosophy       (Followers: 24) British Journal for the Philosophy of Science       (Followers: 25) British Journal of Aesthetics       (Followers: 18) Bulletin de Philosophie Medievale       (Followers: 4) Bulletin of Symbolic Logic, The       (Followers: 3) Cadernos do PET Filosofia Cadernos Nietzsche Cadernos Zygmunt Bauman Canadian Journal of Philosophy       (Followers: 12) Childhood & Philosophy       (Followers: 2) Chisholm Health Ethics Bulletin       (Followers: 1) Church Heritage       (Followers: 7) Cinta de Moebio Circe de clásicos y modernos Coactivity: Philosophy, Communication / Santalka: Filosofija, Komunikacija Cognitive Semiotics       (Followers: 1) Collingwood and British Idealism Studies       (Followers: 1) Comparative and Continental Philosophy       (Followers: 7) Comparative Philosophy       (Followers: 8) Conceptus : zeitschrift für philosophie CONJECTURA : filosofia e educação Constellations       (Followers: 8) Contagion : Journal of Violence, Mimesis, and Culture       (Followers: 8) Contemporary Chinese Thought       (Followers: 6) Contemporary Political Theory       (Followers: 22) Contemporary Pragmatism       (Followers: 1) Continental Philosophy Review       (Followers: 16) Contributions to the History of Concepts       (Followers: 3) Conversations : The Journal of Cavellian Studies Cosmos and History : The Journal of Natural and Social Philosophy       (Followers: 5) CR : The New Centennial Review       (Followers: 1) Critical Horizons       (Followers: 2) Cuadernos de Bioetica Cuestiones de Filosofía Cultura. International Journal of Philosophy of Culture and Axiology       (Followers: 3) Cuyo Anuario de Filosofía Argentina y Americana Dao       (Followers: 4) Décalages : An Althusser Studies Journal Design Philosophy Papers       (Followers: 4) Deutsche Zeitschrift für Philosophie       (Followers: 1) Dialogue Canadian Philosophical Review/Revue canadienne de philosophie       (Followers: 1) Diánoia Dilemata Diogenes       (Followers: 7) Doctor virtualis       (Followers: 2) EarthSong Journal: Perspectives in Ecology, Spirituality and Education       (Followers: 1) Eidos       (Followers: 1) Eleutheria       (Followers: 1) Empedocles : European Journal for the Philosophy of Communication       (Followers: 1) Endeavour       (Followers: 4) Environmental Ethics Episteme       (Followers: 9) Erasmus of Rotterdam Society Yearbook       (Followers: 3) Ergo, an Open Access Journal of Philosophy Erkenntnis       (Followers: 13) Escritos Essays in Philosophy       (Followers: 1) Estudios de Filosofía Estudios de Filosofía Práctica e Historia de las Ideas

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 Eidos   [SJR: 0.101]   [3 followers]  Follow       Open Access journal    ISSN (Print) 1692-8857 - ISSN (Online) 2011-7477    Published by SciELO  [789 journals]
• Trapped vortices in multiply connected domains

• Authors: Rhodri B Nelson; Takashi Sakajo
First page: 061402
Abstract: This paper details a generalized method to, within some numerical tolerance, compute vortex equilibria in the presence of many obstacles. Given a conformal mapping ##IMG## [http://ej.iop.org/images/1873-7005/46/6/061402/fdr495152ieqn1.gif] {$z\left( \zeta \right)$} between a pre-image circular domain and the physical domain, stationary conditions for the point vortices and the desired Kutta conditions are constructed and then solved using a Brownian Ratchets scheme. The method is applied to a Kasper Wing (three plate) configuration and results are compared to those of a single plate. The lift experienced by the main plate is seen to be sensitive to the placement of the two additional plates but their presence can be force enhancing for certain configurations.
Citation: Fluid Dynamics Research
PubDate: 2014-10-03T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

• Splitting of a turbulent puff in pipe flow

• Authors: Masaki Shimizu; Paul Manneville, Yohann Duguet Genta Kawahara
First page: 061403
Abstract: The transition to turbulence of the flow in a pipe of constant radius is numerically studied over a range of Reynolds numbers where turbulence begins to expand by puff splitting . We first focus on the case ##IMG## [http://ej.iop.org/images/1873-7005/46/6/061403/fdr495356ieqn1.gif] {$\operatorname{Re}=2300$} where splitting occurs as discrete events. Around this value only long-lived pseudo-equilibrium puffs can be observed in practice, as typical splitting times become very long. When ##IMG## [http://ej.iop.org/images/1873-7005/46/6/061403/fdr495356ieqn2.gif] {$\operatorname{Re}$} is further increased, the flow enters a more continuous puff splitting regime where turbulence spreads faster. Puff splitting presents itself as a two-step stochastic process. A splitting puff first emits a chaotic pseudopod made of azimuthally localized streaky structures at the downstream (leading) laminar–turbulent interface. This structure can later...
Citation: Fluid Dynamics Research
PubDate: 2014-10-03T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

• Theoretical prediction of a bright pattern of reflective flakes in a
precessing sphere

• Authors: Shigeo Kida
First page: 061404
Abstract: Non-trivial bright patterns of reflective flakes recently observed experimentally and numerically in a precessing sphere are reproduced theoretically by the use of a small flat-plate model of flakes with diffusion effects of Brownian motion and the asymptotic velocity field in the double limit of large Reynolds numbers and small Poincaré numbers. It is shown that what is visualized by flakes is not the local flow field but the overall contribution of the velocity gradient, induced by the conical shear layers, over the whole orbit of flakes. It is suggested that Brownian motion plays a significant role to the orientation distribution of flakes.
Citation: Fluid Dynamics Research
PubDate: 2014-10-03T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

• Vortical flow structure of thermoacoustic oscillations in a closed tube

• Authors: Katsuya Ishii; Shyun Kitagawa, Masahiro Ishigaki Shizuko Adachi
First page: 061408
Abstract: Spontaneous thermoacoustic oscillations of a gas in a closed cylindrical tube are studied. Numerical simulations of the flow field in the tube on which a temperature gradient along the axis is imposed are performed by solving the axisymmetric compressible Navier–Stokes equations. The wall temperature of the hot part near both ends (300 K) and that of the cold part near the center (20 K) are fixed. The computations are done for various values of the length ratio ξ of the hot part to the cold part between 0.3 and 1.0, and steady oscillatory states are obtained. These states are divided into three groups according to the magnitude of the pressure amplitude. The state in each group has distinguished features of the flow field. We analyze the effect of vortices on the structure of the temperature distribution. The difference of the boundary layer thickness between the hot part and the cold part is shown to play an important role.
Citation: Fluid Dynamics Research
PubDate: 2014-10-03T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

• A parametrization of two-dimensional turbulence based on a maximum entropy
production principle with a local conservation of energy

• Authors: Pierre-Henri Chavanis
First page: 061409
Abstract: In the context of two-dimensional (2D) turbulence, we apply the maximum entropy production principle (MEPP) by enforcing a local conservation of energy. This leads to an equation for the vorticity distribution that conserves all the Casimirs, the energy, and that increases monotonically the mixing entropy ( H -theorem). Furthermore, the equation for the coarse-grained vorticity dissipates monotonically all the generalized enstrophies. These equations may provide a parametrization of 2D turbulence. They do not generally relax towards the maximum entropy state. The vorticity current vanishes for any steady state of the 2D Euler equation. Interestingly, the equation for the coarse-grained vorticity obtained from the MEPP turns out to coincide, after some algebraic manipulations, with the one obtained with the anticipated vorticity method. This shows a connection between these two approaches when the conservation of energy is treated locally. Furthermore, the newly derived equat...
Citation: Fluid Dynamics Research
PubDate: 2014-10-03T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

• On point vortex models of exotic bluff body wakes

• Authors: Mark A Stremler; Saikat Basu
First page: 061410
Abstract: Exotic vortex wakes, in which three or more vortices are generated during each shedding cycle, are frequently found in the wake of an oscillating bluff body. Two common examples are P+S wakes (with 3 vortices) and 2P wakes (with 4 vortices). We consider mathematical models of these wakes consisting of N = 3 or 4 point vortices with constant strengths in an inviscid fluid that is otherwise at rest in a singly-periodic domain. By enforcing constraints on the vortex strengths and, in the case of N = 4, on the symmetry of the vortex locations, the mathematical models reduce to integrable Hamiltonian systems. We compare the point vortex trajectories with two exotic wake patterns reported in the literature. Results support the use of point vortex modeling to investigate vortex dynamics in exotic wakes and suggest the need for additional classification of experimental wake patterns.
Citation: Fluid Dynamics Research
PubDate: 2014-10-16T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

• Interaction between compressible fluid and sound in a flue instrument

• Authors: Taizo Kobayashi; Takahiro Akamura, Yuki Nagao, Takuya Iwasaki, Kenʼichiro Nakano, Kinʼya Takahashi Mutsumi Aoyagi
First page: 061411
Abstract: In order to study the generation of (aerodynamic) sound in flue instruments, we numerically apply Howeʼs energy corollary for a two-dimensional model of a flue instrument. Howeʼs energy corollary enables us to estimate the energy transfer between the fluid flow and acoustic field. To implement it, separating the acoustic field from the fluid flow is needed. However the complete method to numerically achieve it has not been established yet. In this work, we develop an approximate method, which has been recently proposed in their experimental studies by Yoshikawa et al (2012 J. Sound Vib. 331 [http://dx.doi.org/10.1016/j.jsv.2012.01.026] 2558–77 ) and others, and we apply it to the simulation of the model instrument. We first calculate fluid flow and acoustic oscillation simultaneously by a compressible fluid solver. Next referring to the information on the acoustic oscillation obtained we set up a pressure source on an acoustic solver and reproduce ...
Citation: Fluid Dynamics Research
PubDate: 2014-10-16T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

• The Jones polynomial as a new invariant of topological fluid dynamics

• Authors: Renzo L Ricca; Xin Liu
First page: 061412
Abstract: A new method based on the use of the Jones polynomial, a well-known topological invariant of knot theory, is introduced to tackle and quantify topological aspects of structural complexity of vortex tangles in ideal fluids. By re-writing the Jones polynomial in terms of helicity, the resulting polynomial becomes then function of knot topology and vortex circulation, providing thus a new invariant of topological fluid dynamics. Explicit computations of the Jones polynomial for some standard configurations, including the Whitehead link and the Borromean rings (whose linking numbers are zero), are presented for illustration. In the case of a homogeneous, isotropic tangle of vortex filaments with same circulation, the new Jones polynomial reduces to some simple algebraic expression, that can be easily computed by numerical methods. This shows that this technique may offer a new setting and a powerful tool to detect and compute topological complexity and to investigate relations with e...
Citation: Fluid Dynamics Research
PubDate: 2014-10-16T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

• Quasi-cyclic evolution of turbulence driven by a steady force in a
periodic cube

• Authors: Tatsuya Yasuda; Susumu Goto Genta Kawahara
First page: 061413
Abstract: The quasi-cyclic evolution of turbulence driven by a steady force in a periodic cube is investigated by means of large-eddy simulations with vanishing kinematic viscosity. By constraining the domain size so that only a single series of energy cascade events can take place, quasi-cyclic motions of multi-scale coherent vortices with a period of about 20 T are realized. (Here, T denotes the turnover time of the largest eddies.) The observed cycle is composed of four periods characterized by activities of the largest- and smallest-resolvable-scale eddies. Vigorous energy cascade events, which last for about 2 T , are observed between the two moments when large- and small-scale eddies are active. Even though we have examined only a special case of steady forces, such cyclic behavior of turbulence is likely to capture the essential dynamics of the regeneration cycle of multi-scale coherent structures, that is, the energy cascade in homogeneous isotropic turbulence at ...
Citation: Fluid Dynamics Research
PubDate: 2014-10-16T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

• Vortex particle method in parallel computations on graphical processing
units used in study of the evolution of vortex structures

• Authors: Henryk Kudela; Andrzej Kosior
First page: 061414
Abstract: Understanding the dynamics and the mutual interaction among various types of vortical motions is a key ingredient in clarifying and controlling fluid motion. In the paper several different cases related to vortex tube interactions are presented. Due to problems with very long computation times on the single processor, the vortex-in-cell (VIC) method is implemented on the multicore architecture of a graphics processing unit (GPU). Numerical results of leapfrogging of two vortex rings for inviscid and viscous fluid are presented as test cases for the new multi-GPU implementation of the VIC method. Influence of the Reynolds number on the reconnection process is shown for two examples: antiparallel vortex tubes and orthogonally offset vortex tubes. Our aim is to show the great potential of the VIC method for solutions of three-dimensional flow problems and that the VIC method is very well suited for parallel computation.
Citation: Fluid Dynamics Research
PubDate: 2014-10-16T00:00:00Z
Issue No: Vol. 46, No. 6 (2014)

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