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Articoli di riviste sul tema "Analogie de Reynolds"

Autore: Grafiati

Pubblicato: 5 ottobre 2024

Ultima modifica: 31 luglio 2025

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1

Ghosh, Bikramaditya, Krishna M.C., Shrikanth Rao, Emira Kozarević, and Rahul Kumar Pandey. "Predictability and herding of bourse volatility: an econophysics analogue." Investment Management and Financial Innovations 15, no. 2 (2018): 317–26. http://dx.doi.org/10.21511/imfi.15(2).2018.28.

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Financial Reynolds number works as a proxy for volatility in stock markets. This piece of work helps to identify the predictability and herd behavior embedded in the financial Reynolds number (time series) series for both CNX Nifty Regular and CNX Nifty High Frequency Trading domains. Hurst exponent and fractal dimension have been used to carry out this work. Results confirm conclusive evidence of predictability and herd behavior for both the indices. However, it has been observed that CNX Nifty High Frequency Trading domain (represented by its corresponding financial Reynolds number) is more

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2

de Roode, Stephan R., Peter G. Duynkerke, and A. Pier Siebesma. "Analogies between Mass-Flux and Reynolds-Averaged Equations." Journal of the Atmospheric Sciences 57, no. 10 (2000): 1585–98. http://dx.doi.org/10.1175/1520-0469(2000)057<1585:abmfar>2.0.co;2.

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3

Deckelman, Steven, Jennifer Graetz, and Tyler Russell. "A multiplicative analogue of the Reynolds operator and construction of invariants." Rocky Mountain Journal of Mathematics 45, no. 4 (2015): 1107–18. http://dx.doi.org/10.1216/rmj-2015-45-4-1107.

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4

Gaviglio, J. "Reynolds analogies and experimental study of heat transfer in the supersonic boundary layer." International Journal of Heat and Mass Transfer 30, no. 5 (1987): 911–26. http://dx.doi.org/10.1016/0017-9310(87)90010-x.

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5

McKeon, B. J., and J. F. Morrison. "Asymptotic scaling in turbulent pipe flow." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 365, no. 1852 (2007): 771–87. http://dx.doi.org/10.1098/rsta.2006.1945.

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The streamwise velocity component in turbulent pipe flow is assessed to determine whether it exhibits asymptotic behaviour that is indicative of high Reynolds numbers. The asymptotic behaviour of both the mean velocity (in the form of the log law) and that of the second moment of the streamwise component of velocity in the outer and overlap regions is consistent with the development of spectral regions which indicate inertial scaling. It is shown that an ‘inertial sublayer’ in physical space may be considered as a spatial analogue of the inertial subrange in the velocity spectrum and such beha

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6

Radkevich, E. V., E. A. Lukashev, and O. A. Vasil’eva. "Hydrodynamic instabilities and nonequilibrium phase transitions." Доклады Академии наук 486, no. 5 (2019): 537–42. http://dx.doi.org/10.31857/s0869-56524865537-542.

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For laminar-turbulent transition model is built reconstruction of the initial stage of instability as a nonequilibrium phase transition, the mechanism of which is diffusion stratification. It is shown that the Gibbs free energy deviations from the homogeneous state (relative to the instability under consideration) is an analogue Ginzburg-Landau potentials. Numerical experiments were performed. Self-excitation of a homogeneous state by edge control condition of increasing speed. Under external influence (increase in speed at the input), there is a transition to chaos through bifurcations of per

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7

CHILDRESS, STEPHEN, SAVERIO E. SPAGNOLIE, and TADASHI TOKIEDA. "A bug on a raft: recoil locomotion in a viscous fluid." Journal of Fluid Mechanics 669 (January 12, 2011): 527–56. http://dx.doi.org/10.1017/s002211201000515x.

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The locomotion of a body through an inviscid incompressible fluid, such that the flow remains irrotational everywhere, is known to depend on inertial forces and on both the shape and the mass distribution of the body. In this paper we consider the influence of fluid viscosity on such inertial modes of locomotion. In particular we consider a free body of variable shape and study the centre-of-mass and centre-of-volume variations caused by a shifting mass distribution. We call this recoil locomotion. Numerical solutions of a finite body indicate that the mechanism is ineffective in Stokes flow b

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8

Zhao, Shuo, Xiaoping Chen, Yuting Yang, and Dengsong Huang. "Effects of Viscosity Law on High-Temperature Supersonic Turbulent Channel Flow for Chemical Equilibrium." Processes 12, no. 2 (2024): 256. http://dx.doi.org/10.3390/pr12020256.

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Direct numerical simulations of temporally evolving high-temperature supersonic turbulent channel flow for chemical equilibrium were conducted with a Mach number of 3.0, a Reynolds number of 4880, and a wall temperature of 1733.2 K to investigate the influence of the viscosity law. The mean and fluctuating viscosity for the mixture rule is higher than that for Sutherland’s law, whereas an opposite trend is observed in the mean temperature, mean pressure, and dissociation degree. The Trettel and Larsson transformed mean velocity, the Reynolds shear stress, the turbulent kinetic energy budget, a

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9

Yim, Eunok, and Paul Billant. "Analogies and differences between the stability of an isolated pancake vortex and a columnar vortex in stratified fluid." Journal of Fluid Mechanics 796 (May 11, 2016): 732–66. http://dx.doi.org/10.1017/jfm.2016.248.

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In order to understand the dynamics of pancake shaped vortices in stably stratified fluids, we perform a linear stability analysis of an axisymmetric vortex with Gaussian angular velocity in both the radial and axial directions with an aspect ratio of ${\it\alpha}$. The results are compared to those for a columnar vortex (${\it\alpha}=\infty$) in order to identify the instabilities. Centrifugal instability occurs when $\mathscr{R}>c(m)$ where $\mathscr{R}=ReF_{h}^{2}$ is the buoyancy Reynolds number, $F_{h}$ the Froude number, $Re$ the Reynolds number and $c(m)$ a constant which differs for

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10

JIMÉNEZ, JAVIER, SERGIO HOYAS, MARK P. SIMENS, and YOSHINORI MIZUNO. "Turbulent boundary layers and channels at moderate Reynolds numbers." Journal of Fluid Mechanics 657 (June 2, 2010): 335–60. http://dx.doi.org/10.1017/s0022112010001370.

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The behaviour of the velocity and pressure fluctuations in the outer layers of wall-bounded turbulent flows is analysed by comparing a new simulation of the zero-pressure-gradient boundary layer with older simulations of channels. The 99 % boundary-layer thickness is used as a reasonable analogue of the channel half-width, but the two flows are found to be too different for the analogy to be complete. In agreement with previous results, it is found that the fluctuations of the transverse velocities and of the pressure are stronger in the boundary layer, and this is traced to the pressure fluct

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11

HALL, PHILIP, and SPENCER SHERWIN. "Streamwise vortices in shear flows: harbingers of transition and the skeleton of coherent structures." Journal of Fluid Mechanics 661 (August 16, 2010): 178–205. http://dx.doi.org/10.1017/s0022112010002892.

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The relationship between asymptotic descriptions of vortex–wave interactions and more recent work on ‘exact coherent structures’ is investigated. In recent years immense interest has been focused on so-called self-sustained processes in turbulent shear flows where the importance of waves interacting with streamwise vortex flows has been elucidated in a number of papers. In this paper, it is shown that the so-called ‘lower branch’ state which has been shown to play a crucial role in these self-sustained processes is a finite Reynolds number analogue of a Rayleigh vortex–wave interaction with sc

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12

MYDLARSKI, L. "Mixed velocity–passive scalar statistics in high-Reynolds-number turbulence." Journal of Fluid Mechanics 475 (January 25, 2003): 173–203. http://dx.doi.org/10.1017/s0022112002002756.

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Statistics of the mixed velocity–passive scalar field and its Reynolds number dependence are studied in quasi-isotropic decaying grid turbulence with an imposed mean temperature gradient. The turbulent Reynolds number (using the Taylor microscale as the length scale), Rλ, is varied over the range 85 [les ] Rλ [les ] 582. The passive scalar under consideration is temperature in air. The turbulence is generated by means of an active grid and the temperature fluctuations result from the action of the turbulence on the mean temperature gradient. The latter is created by differentially heating elem

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13

Nyandeni, Zamashobane, and Tiri Chinyoka. "Computational aeroacoustic modeling using hybrid Reynolds averaged Navier–Stokes/large‐eddy simulations methods with modified acoustic analogies." International Journal for Numerical Methods in Fluids 93, no. 8 (2021): 2611–36. http://dx.doi.org/10.1002/fld.4990.

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14

Bayada, Guy, and Grzegorz Łkaszewicz. "On micropolar fluids in the theory of lubrication. Rigorous derivation of an analogue of the reynolds equation." International Journal of Engineering Science 34, no. 13 (1996): 1477–90. http://dx.doi.org/10.1016/0020-7225(96)00031-6.

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15

Colagrossi, Andrea, Emanuele Rossi, Salvatore Marrone, and David Le Touzé. "Particle Methods for Viscous Flows: Analogies and Differences Between the SPH and DVH Methods." Communications in Computational Physics 20, no. 3 (2016): 660–88. http://dx.doi.org/10.4208/cicp.150915.170316a.

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AbstractIn this work two particle methods are studied in the context of viscous flows. The first one is a Vortex Particle Method, called Diffused Vortex Hydrodynamics (DVH), recently developed to simulate complex viscous flows at medium and high Reynolds regimes. This method presents some similarities with the SPH model and its Lagrangian meshless nature, even if it is based on a different numerical approach. Advantages and drawbacks of the two methods have been previously studied in Colagrossi et al. [1] from a theoretical point of view and in Rossi et al. [2], where these particle methods ha

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16

Litvinenko, Yuri E. "Plasma Flows in Solar Filaments as Electromagnetically Driven Vortical Flows." Physics 3, no. 4 (2021): 1046–50. http://dx.doi.org/10.3390/physics3040065.

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Electromagnetic expulsion acts on a body suspended in a conducting fluid or plasma, which is subject to the influence of electric and magnetic fields. Physically, the effect is a magnetohydrodynamic analogue of the buoyancy (Archimedean) force, which is caused by the nonequal electric conductivities inside and outside the body. It is suggested that electromagnetic expulsion can drive the observed plasma counter-streaming flows in solar filaments. Exact analytical solutions and scaling arguments for a characteristic plasma flow speed are reviewed, and their applicability in the limit of large m

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17

Banerjee, I., M. E. Rosti, T. Kumar, L. Brandt, and A. Russom. "Analogue tuning of particle focusing in elasto-inertial flow." Meccanica 56, no. 7 (2021): 1739–49. http://dx.doi.org/10.1007/s11012-021-01329-z.

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AbstractWe report a unique tuneable analogue trend in particle focusing in the laminar and weak viscoelastic regime of elasto-inertial flows. We observe experimentally that particles in circular cross-section microchannels can be tuned to any focusing bandwidths that lie between the “Segre-Silberberg annulus” and the centre of a circular microcapillary. We use direct numerical simulations to investigate this phenomenon and to understand how minute amounts of elasticity affect the focussing of particles at increasing flow rates. An Immersed Boundary Method is used to account for the presence of

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18

Madden, J., and J. Vermeer. "Lindelöf locales and realcompactness." Mathematical Proceedings of the Cambridge Philosophical Society 99, no. 3 (1986): 473–80. http://dx.doi.org/10.1017/s0305004100064410.

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We show that a locale possesses the localic analogue of the property of realcompactness if and only if it is regular Lindelöf. Thus, the localic version of the Hewitt real-compactification, originally defined by G.Reynolds using σ-frames, is the regular Lindelöf reflection. An immediate consequence is that a space is realcompact if and only if it is the point space of a regular Lindelöf local (3·2). We point out a nice analogy between a theorem of Reynolds and Stone's classical representation theorem for boolean algebras. Finally, we show that the quasi-F cover of a compact Hausdorff space is

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19

SI, J., and K. ZHU. "NUMERICAL STUDY ON AERODYNAMIC CHARACTERISTICS OF BUNDLE CONDUCTOR FOR UHV BASED ON ALE METHOD." Latin American Applied Research - An international journal 44, no. 3 (2014): 237–45. http://dx.doi.org/10.52292/j.laar.2014.447.

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The bundle conductor is often threatened by the wind-excited or wake-induced vibration generated by vortex shedding. So as to simulate the common fluid–structure nonlinear interaction problems in Ultra-High Voltage (UHV) transmission lines, the N-S equations of incompressible viscous fluid with the ALE description has been adopted to formulate the fluid-solid governing equations in the analogue computation and the 2-bundle and 6bundle sectional models, as well as the deduced finite element discretization scheme of conductor displacement are introduced in the algorithm. Wind tunnel experimental

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20

Kerswell, R. R., and A. Davey. "On the linear instability of elliptic pipe flow." Journal of Fluid Mechanics 316 (June 10, 1996): 307–24. http://dx.doi.org/10.1017/s0022112096000559.

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The linear stability of elliptic pipe flow is considered for finite aspect ratios thereby bridging the gap between the small-aspect-ratio analysis of Davey & Salwen (1994) and the large-aspect-ratio asymptotics of Hocking (1977). The flow is found to become linearly unstable above an aspect ratio of about 10.4 to the spanwise-modulated analogue of the Orr-Sommerfeld mode to which plane Poiseuille flow first loses stability. This disturbance is found to possess a series of intense vortices along its critical layer at lateral stations far removed from the central minor axis. The critical Rey

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21

GONZÁLEZ, L. M., M. AHMED, J. KÜHNEN, H. C. KUHLMANN, and V. THEOFILIS. "Three-dimensional flow instability in a lid-driven isosceles triangular cavity." Journal of Fluid Mechanics 675 (March 22, 2011): 369–96. http://dx.doi.org/10.1017/s002211201100022x.

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Linear three-dimensional modal instability of steady laminar two-dimensional states developing in a lid-driven cavity of isosceles triangular cross-section is investigated theoretically and experimentally for the case in which the equal sides form a rectangular corner. An asymmetric steady two-dimensional motion is driven by the steady motion of one of the equal sides. If the side moves away from the rectangular corner, a stationary three-dimensional instability is found. If the motion is directed towards the corner, the instability is oscillatory. The respective critical Reynolds numbers are

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22

Manikantan, Harishankar, and Todd M. Squires. "Irreversible particle motion in surfactant-laden interfaces due to pressure-dependent surface viscosity." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 473, no. 2205 (2017): 20170346. http://dx.doi.org/10.1098/rspa.2017.0346.

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The surface shear viscosity of an insoluble surfactant monolayer often depends strongly on its surface pressure. Here, we show that a particle moving within a bounded monolayer breaks the kinematic reversibility of low-Reynolds-number flows. The Lorentz reciprocal theorem allows such irreversibilities to be computed without solving the full nonlinear equations, giving the leading-order contribution of surface pressure-dependent surface viscosity. In particular, we show that a disc translating or rotating near an interfacial boundary experiences a force in the direction perpendicular to that bo

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23

Liu, Yang, Dong-Chuan Mo, and Shu-Shen Lyu. "Vortex-Induced Turbulence Optimized Membrane Enthalpy Exchanger: Dynamic Humidity Modulation and Coupled Heat–Mass Transfer Enhancement." Energies 18, no. 11 (2025): 2892. https://doi.org/10.3390/en18112892.

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A bioinspired vortex-inducing architecture was engineered within the hydrodynamic focusing region of membrane-based enthalpy exchangers (MEEs) to generate controlled Kármán vortex shedding, strategically enhancing thermal–hygric coupling through boundary layer modulation. Computational simulations employing ANSYS Fluent 2024R1 and grid-convergence validation (GCI < 1.8%) demonstrated that at Re = 392 (2.57 m/s flow velocity), the vortex-integrated configuration achieved temperature exchange efficiency enhancements of 3.91% (summer) and 3.58% (winter), latent efficiency gains of 3.71% and 3.

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24

Artem, Khalatov, Kovalenko Glib, and Muliarchuk Mariia. "RESEARCH OF HYDRODYNAMICS AND HEAT TRANSFER DURING THE TRANSVERSE AIR FLOW OF A ROW OF CYLINDERS WITH SCREW GROOVES." Eastern-European Journal of Enterprise Technologies 3, no. 8 (105) (2020): 39–45. https://doi.org/10.15587/1729-4061.2020.205656.

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Cylinder cross-flow is a common phenomenon in many fields of technology. Technological simplicity of tubular structures makes them attractive, especially when using working bodies that are under different pressure values. However, the cylinders belong to the category of «poorly streamlined» bodies, and there are many opportunities to improve their hydrodynamics and heat transfer. For a circular cylinder, there is a speed range in which its hydraulic resistance can decrease due to the deformation of the cylinder surface. This phenomenon can be used for the rational design of heat ex

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25

Марзаева, В. И. "Математическое моделирование распространения верховых лесных пожаров при наличии противопожарных разрывов и заслонов". Журнал технической физики 89, № 8 (2019): 1141. http://dx.doi.org/10.21883/jtf.2019.08.47883.392-18.

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Using the method of mathematical modeling, the process of spreading forest fires in the presence of fire breaks and barriers consisting of hardwood trees was studied. Mathematically, this problem is reduced to solving the Reynolds equations for turbulent flow, taking into account chemical reactions. To obtain a discrete analogue, the control volume method was used. Using numerical calculations, we obtained the distributions of the fields of velocity, temperature, oxygen concentrations, volatile products of pyrolysis, combustion and volume fractions of the condensed phase. The model allowed us

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26

Gourdain, Nicolas, Jéromine Dumon, Yannick Bury, and Pascal Molton. "Transonic buffet of a space launcher aileron: Fanno and Rayleigh flows analogies." International Journal of Numerical Methods for Heat & Fluid Flow 32, no. 4 (2021): 1255–80. http://dx.doi.org/10.1108/hff-07-2021-0506.

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Purpose The transonic buffet is a complex aerodynamics phenomenon that imposes severe constraints on the design of high-speed vehicles, including for aircraft and space launchers. The origin of buffet is still debated in the literature, and the control of this phenomenon remains difficult. This paper aims to propose an original scenario to explain the origin of buffet, which in turn opens promising perspectives for its alleviation and attenuation. Design/methodology/approach This work relies on the use of numerical simulations, with the idea to reproduce the buffet phenomenon in a transonic ai

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27

Kerstein, Alan R. "Linear-eddy modelling of turbulent transport. Part 6. Microstructure of diffusive scalar mixing fields." Journal of Fluid Mechanics 231 (October 1991): 361–94. http://dx.doi.org/10.1017/s0022112091003439.

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The linear-eddy approach for modelling molecular mixing in turbulent flow involves stochastic simulation on a one-dimensional domain with sufficient resolution to include all physically relevant lengthscales. In each realization, molecular diffusion is implemented deterministically, punctuated by a sequence of instantaneous, statistically independent ‘rearrangement events’ (measure-preserving maps) representing turbulent stirring. These events emulate the effect of compressive strain on the scalar field. An inertial-range similarity law is incorporated.The model reproduces key features of scal

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28

MacDonald, M., N. Hutchins, and D. Chung. "Roughness effects in turbulent forced convection." Journal of Fluid Mechanics 861 (December 19, 2018): 138–62. http://dx.doi.org/10.1017/jfm.2018.900.

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We conducted direct numerical simulations of turbulent flow over three-dimensional sinusoidal roughness in a channel. A passive scalar is present in the flow with Prandtl number $Pr=0.7$, to study heat transfer by forced convection over this rough surface. The minimal-span channel is used to circumvent the high cost of simulating high-Reynolds-number flows, which enables a range of rough surfaces to be efficiently simulated. The near-wall temperature profile in the minimal-span channel agrees well with that of the conventional full-span channel, indicating that it can be readily used for heat-

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29

Bacila Sahd, Fábio. "O debate sobre o apartheid israelense à luz do caso sul-africano e do direito internacional. A pertinência e os limites de uma analogia dual." História: Questões & Debates 71, no. 2 (2024): 225–53. http://dx.doi.org/10.5380/his.v71i2.82719.

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O presente artigo faz uma revisão bibliográfica e documental crítica do já amplo debate sobre a possível prática de apartheid pelo Estado de Israel. Embora as acusações sejam antigas, ganharam corpo no novo milênio, diante do fracasso do processo de paz. Não se pretende esgotar a discussão, apenas apresentar criticamente as duas principais abordagens. Lugar de destaque é dado à tese de Dugard e Reynolds, formulada a partir do direito internacional e da tipificação penal de apartheid, contraposta a reflexões fundadas nas ciências humanas. Subjacente a esse debate específico sobre o caso palesti

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30

Ganguli, Arijit, Viraj Bhatt, Anna Yagodnitsyna, Dipak Pinjari, and Aniruddha Pandit. "A Review of Pressure Drop and Mixing Characteristics in Passive Mixers Involving Miscible Liquids." Micromachines 15, no. 6 (2024): 691. http://dx.doi.org/10.3390/mi15060691.

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The present review focuses on the recent studies carried out in passive micromixers for understanding the hydrodynamics and transport phenomena of miscible liquid–liquid (LL) systems in terms of pressure drop and mixing indices. First, the passive micromixers have been categorized based on the type of complexity in shape, size, and configuration. It is observed that the use of different aspect ratios of the microchannel width, presence of obstructions, flow and operating conditions, and fluid properties majorly affect the mixing characteristics and pressure drop in passive micromixers. A regim

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31

Tuominen, Ilkka, Maarit J. Korpi, Petri J. Käpylä, Marjaana Lindborg, and Ilya Ilyin. "Stellar nonlinear dynamos: observations and modelling." Proceedings of the International Astronomical Union 4, S259 (2008): 417–18. http://dx.doi.org/10.1017/s1743921309030944.

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AbstractRecent numerical modelling of mean-field stellar dynamos with induction and Reynolds' equations show that, with increasing rotation, field symmetry changes from an axisymmetric solar type to a nonaxymmetric one, where the so-called active longitudes in the same stellar hemisphere are predicted to be of opposite polarities. It was originally named Active star Hale rule in Tuominen et al. (2002), being an analogue to the famous bipolar sunspot polarity rule but different in scale and being a global phenomenon. In addition to long timeseries of temperature mapping and photometry, during t

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DUAN, L., I. BEEKMAN, and M. P. MARTÍN. "Direct numerical simulation of hypersonic turbulent boundary layers. Part 2. Effect of wall temperature." Journal of Fluid Mechanics 655 (May 13, 2010): 419–45. http://dx.doi.org/10.1017/s0022112010000959.

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In this paper, we perform direct numerical simulation (DNS) of turbulent boundary layers at Mach 5 with the ratio of wall-to-edge temperature Tw/Tδ from 1.0 to 5.4 (Cases M5T1 to M5T5). The influence of wall cooling on Morkovin's scaling, Walz's equation, the standard and modified strong Reynolds analogies, turbulent kinetic energy budgets, compressibility effects and near-wall coherent structures is assessed. We find that many of the scaling relations used to express adiabatic compressible boundary-layer statistics in terms of incompressible boundary layers also hold for non-adiabatic cases.

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Swan, James W., and John F. Brady. "The hydrodynamics of confined dispersions." Journal of Fluid Mechanics 687 (October 17, 2011): 254–99. http://dx.doi.org/10.1017/jfm.2011.351.

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AbstractA method is proposed for computing the low-Reynolds-number hydrodynamic forces on particles comprising a suspension confined by two parallel, no-slip walls. This is constructed via the two-dimensional analogue of Hasimoto’s solution (J. Fluid Mech., vol. 5, 1959, pp. 317–328) for a periodic array of point forces in a viscous, incompressible fluid, and, like Hasimoto, the summation of interactions is accelerated by substitution and superposition of ‘Ewald-like’ forcing. This method is akin to the accelerated Stokesian dynamics technique (J. Fluid Mech., vol. 448, 2001, pp. 115–146) and

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34

Perminov, V. A., and K. O. Fryanova. "Mathematical modeling of the initiation and spread of forest fires and their impact on buildings and structures." Bulletin of the Karaganda University. "Physics" Series 99, no. 3 (2020): 54–61. http://dx.doi.org/10.31489/2020ph3/54-61.

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Currently, methods of mathematical modeling are used to study processes in emergency situations. Forest fires are extremely complex and destructive natural phenomena which depend on availability of fuel, meteorological and other conditions. Mathematical model of forest fire is based on an analysis of known experimental data and using concept and methods from reactive media mechanics. In this paper the theoretical study of the problems of crown forest fire spread in windy condition and their thermal impact on the wooden building were carried out. The research was based on numerical solution of

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Mouza, Aikaterini, Olga Skordia, Ioannis Tzouganatos, and Spiros Paras. "A Simplified Model for Predicting Friction Factors of Laminar Blood Flow in Small-Caliber Vessels." Fluids 3, no. 4 (2018): 75. http://dx.doi.org/10.3390/fluids3040075.

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The aim of this study was to provide scientists with a straightforward correlation that can be applied to the prediction of the Fanning friction factor and consequently the pressure drop that arises during blood flow in small-caliber vessels. Due to the small diameter of the conduit, the Reynolds numbers are low and thus the flow is laminar. This study has been conducted using Computational Fluid Dynamics (CFD) simulations validated with relevant experimental data, acquired using an appropriate experimental setup. The experiments relate to the pressure drop measurement during the flow of a blo

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Yu, Xiaoxi, Yuan Li, Yuquan Liu, Yuping Yang, and Yining Wu. "Flow Patterns of Viscoelastic Fracture Fluids in Porous Media: Influence of Pore-Throat Structures." Polymers 11, no. 8 (2019): 1291. http://dx.doi.org/10.3390/polym11081291.

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Viscoelastic surfactant (VES) fluid and hydrolyzed polyacryamide (HPAM) solution are two of the most common fracturing fluids used in the hydraulic fracturing development of unconventional reservoirs. The filtration of fracturing fluids in porous media is mainly determined by the flow patterns in pore-throat structures. In this paper, three different microdevices analogue of porous media allow access to a large range of Deborah number (De) and concomitantly low Reynolds number (Re). Continuous pore-throat structures were applied to study the feedback effect of downstream structure on upstream

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37

Montenegro-Johnson, T. D., H. Gadêlha, and D. J. Smith. "Spermatozoa scattering by a microchannel feature: an elastohydrodynamic model." Royal Society Open Science 2, no. 3 (2015): 140475. http://dx.doi.org/10.1098/rsos.140475.

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Sperm traverse their microenvironment through viscous fluid by propagating flagellar waves; the waveform emerges as a consequence of elastic structure, internal active moments and low Reynolds number fluid dynamics. Engineered microchannels have recently been proposed as a method of sorting and manipulating motile cells; the interaction of cells with these artificial environments therefore warrants investigation. A numerical method is presented for large-amplitude elastohydrodynamic interaction of active swimmers with domain features. This method is employed to examine hydrodynamic scattering

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38

Kleinhans, Maarten G., Maarten van der Vegt, Jasper Leuven, et al. "Turning the tide: comparison of tidal flow by periodic sea level fluctuation and by periodic bed tilting in scaled landscape experiments of estuaries." Earth Surface Dynamics 5, no. 4 (2017): 731–56. http://dx.doi.org/10.5194/esurf-5-731-2017.

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Abstract. Analogue models or scale experiments of estuaries and short tidal basins are notoriously difficult to create in the laboratory because of the difficulty to obtain currents strong enough to transport sand. Our recently discovered method to drive tidal currents by periodically tilting the entire flume leads to intense sediment transport in both the ebb and flood phase, causing dynamic channel and shoal patterns. However, it remains unclear whether tilting produces periodic flows with characteristic tidal properties that are sufficiently similar to those in nature for the purpose of lan

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39

Mériaux, Catherine A., and Cathy B. Kurz-Besson. "Sedimentation from binary suspensions in a turbulent gravity current along a V-shaped valley." Journal of Fluid Mechanics 712 (September 13, 2012): 624–45. http://dx.doi.org/10.1017/jfm.2012.389.

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AbstractWe present a study of bidispersed particulate gravity currents at high Reynolds numbers flowing along a V-shaped valley. The speed and width of the currents, the mass deposited by the currents and the density of the deposits were examined by both a box model and lock-exchange experiments in a 5 m long tank. Silicon carbide and glass beads were used for the bidispersed suspension models. The initial conditions of the currents were similar, except that the grain size of the glass beads was successively chosen to be 2, 2.5 and 4 times that of the silicon carbide. For all experiments a Sto

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40

Moreau, Stéphane. "Turbomachinery Noise Predictions: Present and Future." Acoustics 1, no. 1 (2019): 92–116. http://dx.doi.org/10.3390/acoustics1010008.

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In future Ultra-High By-Pass Ratio turboengines, the turbomachinery noise (fan and turbine stages mainly) is expected to increase significantly. A review of analytical models and numerical methods to yield both tonal and broadband contributions of such noise sources is presented. The former rely on hybrid methods coupling gust response over very thin flat plates of finite chord length, either isolated or in cascade, and acoustic analogies in free-field and in a duct. The latter yields tonal noise with unsteady Reynolds-Averaged Navier–Stokes (u-RANS) simulations, and broadband noise with Large

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41

Ruschak, Kenneth J., and Steven J. Weinstein. "Laminar, Gravitationally Driven Flow of a Thin Film on a Curved Wall." Journal of Fluids Engineering 125, no. 1 (2003): 10–17. http://dx.doi.org/10.1115/1.1522412.

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Gravitationally driven flow of a thin film down an arbitrarily curved wall is analyzed for moderate Reynolds number by generalizing equations previously developed for flow on a planar wall. In the analysis, the ratio of the characteristic film thickness to the characteristic dimension of the wall is presumed small, and terms estimated to be first order in this parameter are retained. Partial differential equations are reduced to ordinary differential equations by the method of von Ka´rma´n and Pohlhausen; namely, an expression for the velocity profile is assumed, and the equation for conservat

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42

Jardine, M. "Three-dimensional steady-state magnetic reconnection." Journal of Plasma Physics 51, no. 3 (1994): 399–422. http://dx.doi.org/10.1017/s0022377800017657.

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Abstract (sommario):

A family of three-dimensional models of reconnection is presented in which the different members of the family are characterized by the vorticity with which plasma flows towards the reconnection site. The nature of this inflow also determines the size and speed of the outflow jet that carries reconnected field lines away from the reconnection site, and the shape of the MHD shocks that bound it. Flows with positive vorticity are of a flux pile-up type, for which the outflow jet is fastest and narrowest. Among those with negative vorticity is the three-dimensional analogue of Petschek reconnecti

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43

Sow, Aliou, Ashwin Chinnayya, and Abdellah Hadjadj. "Mean structure of one-dimensional unstable detonations with friction." Journal of Fluid Mechanics 743 (March 6, 2014): 503–33. http://dx.doi.org/10.1017/jfm.2014.49.

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AbstractThis investigation deals with the study of the mean structure of a mildly unstable non-ideal detonation wave. The analysis is based on the integration of one-dimensional reactive Euler equations with friction forces using a third-order Runge–Kutta scheme and a fifth-order weighted essentially non-oscillatory (WENO5) spatial discretization. A one-step Arrhenius reaction mechanism is used for modelling the chemical reaction. When the frictional forces are active, the limit cycle based on the post-shock pressure reveals an enhanced pulsating behaviour of the downstream subsonic reaction z

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44

Augier, Pierre, Ashwin Vishnu Mohanan, and Erik Lindborg. "Shallow water wave turbulence." Journal of Fluid Mechanics 874 (July 15, 2019): 1169–96. http://dx.doi.org/10.1017/jfm.2019.375.

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Abstract (sommario):

The dynamics of irrotational shallow water wave turbulence forced at large scales and dissipated at small scales is investigated. First, we derive the shallow water analogue of the ‘four-fifths law’ of Kolmogorov turbulence for a third-order structure function involving velocity and displacement increments. Using this relation and assuming that the flow is dominated by shocks, we develop a simple model predicting that the shock amplitude scales as $(\unicode[STIX]{x1D716}d)^{1/3}$, where $\unicode[STIX]{x1D716}$ is the mean dissipation rate and $d$ the mean distance between the shocks, and tha

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45

Lai, Chris C. K., John J. Charonko, and Katherine Prestridge. "A Kármán–Howarth–Monin equation for variable-density turbulence." Journal of Fluid Mechanics 843 (March 27, 2018): 382–418. http://dx.doi.org/10.1017/jfm.2018.125.

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Abstract (sommario):

We present a generalisation of the Kármán–Howarth–Monin (K–H–M) equation to include variable-density (VD) effects. The derived equation (i) reduces to the original K–H–M equation when density is a constant and (ii) leads to a VD analogue of the $4/5$-law with the same value of constant ($=4/5$) appearing as the prefactor of the dissipation rate. The equation is employed to understand negative turbulent kinetic energy production in a $\text{SF}_{6}$ turbulent round jet with an initial density ratio of 4.2. From a Reynolds-averaged Navier–Stokes (RANS) perspective, negative production means that

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46

Andreev, Oleg, Yurii Kolesnikov, and André Thess. "Visualization of the Ludford column." Journal of Fluid Mechanics 721 (March 13, 2013): 438–53. http://dx.doi.org/10.1017/jfm.2013.76.

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Abstract (sommario):

AbstractWhen a liquid metal flows around a truncated cylinder in the presence of a magnetic field which is parallel to the axis of the cylinder, a stagnant region develops above the cylinder. We call this region a Ludford column. The Ludford column represents the magnetohydrodynamics (MHD) analogue of the well-known Taylor columns in rotating flows. Whereas Taylor columns can be easily visualized using dye, the visualization of Ludford columns has remained elusive up to now because liquid metals are opaque. We demonstrate that this fundamental limitation of experimental MHD can be overcome by

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47

Sahu, Chunendra K., and M. R. Flynn. "Filling box flows in porous media." Journal of Fluid Mechanics 782 (October 9, 2015): 455–78. http://dx.doi.org/10.1017/jfm.2015.555.

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Abstract (sommario):

We report upon a theoretical and experimental investigation of a porous medium ‘filling box’ flow by specifically examining the details of the laminar descending plume and its outflow in a control volume having an impermeable bottom boundary and sidewalls. The plume outflow initially comprises a pair of oppositely directed gravity currents. The gravity currents propagate horizontally until they reach the lateral sidewalls at $y=\pm L$. The flow then becomes of filling box type, with a vertically ascending ‘first front’ separating discharged plume fluid below from ambient fluid above. The flow

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48

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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Abstract (sommario):

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. F

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49

Shaheen, Nighat, Saima Arzeen, and Sidra Batool. "Effect of Depression on Sleep Quality and Pain among Patients with Arthritis Disease." Journal of Peace, Development & Communication 07, no. 01 (2023): 41–52. http://dx.doi.org/10.36968/jpdc-v07-i01-05.

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Abstract (sommario):

The major aim of the present study was to examine the effect of depression on sleep quality and pain among patients with arthritis. The sample included (N=30) arthritis female patients recruited from outpatients of three main hospitals of Peshawar using Convenient Sampling Technique. Age range of the sample was between 45 to 65 years (M=54.51 ± 5.24). The inclusion criteria consisted of patients having diagnosed with hip and/or knee arthritis since one year on the basis of X-rays reports and currently were under treatment. The control group consisted of (N=26) female outpatients in the same ag

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50

Michaelides, Efstathios E. "Hydrodynamic Force and Heat/Mass Transfer From Particles, Bubbles, and Drops—The Freeman Scholar Lecture." Journal of Fluids Engineering 125, no. 2 (2003): 209–38. http://dx.doi.org/10.1115/1.1537258.

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Abstract (sommario):

Recent advances on the analytical form of the hydrodynamic force and heat/mass transfer from a particle, bubble, or drop are examined critically. Also some of the recent computational studies, which help strengthen or clarify our knowledge of the complex velocity and temperature fields associated with the momentum and heat/mass transfer processes are also mentioned in a succinct way. Whenever possible, the processes of energy/mass exchange and of momentum exchange from spheres and spheroids are examined simultaneously and any common results and possible analogies between these processes are po

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