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Artykuły w czasopismach na temat „Critical Flow Regime”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 31 lipca 2025

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1

Dzhaugashtin, K. E. "The critical jet flow regime." Fluid Dynamics 25, no. 3 (1990): 335–39. http://dx.doi.org/10.1007/bf01049812.

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Gryparis, Evgenios, and Georgios C. Georgiou. "Annular Poiseuille flow of Bingham fluids with wall slip." Physics of Fluids 34, no. 3 (2022): 033103. http://dx.doi.org/10.1063/5.0086511.

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We consider the annular Poiseuille flow of a Bingham fluid with wall slip. First, the analytical solution is derived for the case in which Navier-slip conditions are applied at the two cylinders. A sliding (pure plug) regime is observed below a critical pressure gradient, and a yielding regime is eventually encountered above another critical pressure gradient in which the material yields near the two walls and moves as a plug in a core region. An intermediate semi-sliding regime is observed when different slip laws apply at the two walls in which the material yields only near the wall correspo

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3

Viebahn, Jan, and Henk A. Dijkstra. "Critical Transition Analysis of the Deterministic Wind-Driven Ocean Circulation — A Flux-Based Network Approach." International Journal of Bifurcation and Chaos 24, no. 02 (2014): 1430007. http://dx.doi.org/10.1142/s0218127414300079.

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A new method for constructing complex networks from fluid flow fields is proposed. The approach focuses on spatial properties of the flow field, namely, on the topology of the streamline field. The network approach is applied to a model of the wind-driven ocean circulation, which exhibits the prototype of a critical transition, that is, a back-to-back saddle-node bifurcation related to two separate dynamical regimes. The network analysis enables a structural characterization of, on the one hand, the viscous regime as a weakly-connected and highly-assortative regime, and, on the other hand, of

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4

Lamia, Hachemi Rachedi, Lakehal Moussa, and Achour Bachir. "Modern vision for critical flow in an egg-shaped section." Water Science and Technology 84, no. 4 (2021): 840–50. http://dx.doi.org/10.2166/wst.2021.274.

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Abstract The critical regime plays a primordial role in the study of gradually varying flows by classifying flow regimes and slopes. Through this work, a new approach is proposed to analyze critical flow regime in an egg-shaped channel. Based on both the definition of Froude number and Achour and Bedjaoui general discharge relationship, a relation between critical and normal depths is derived and then graphically represented for the particular case of a smooth channel characterized by a generating diameter equal to 1 m. The results show the influence of the slope on the frequency of occurrence

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5

Yu, Liyuan, Richeng Liu, and Yujing Jiang. "A Review of Critical Conditions for the Onset of Nonlinear Fluid Flow in Rock Fractures." Geofluids 2017 (July 6, 2017): 1–17. http://dx.doi.org/10.1155/2017/2176932.

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Selecting appropriate governing equations for fluid flow in fractured rock masses is of special importance for estimating the permeability of rock fracture networks. When the flow velocity is small, the flow is in the linear regime and obeys the cubic law, whereas when the flow velocity is large, the flow is in the nonlinear regime and should be simulated by solving the complex Navier-Stokes equations. The critical conditions such as critical Reynolds number and critical hydraulic gradient are commonly defined in the previous works to quantify the onset of nonlinear fluid flow. This study revi

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6

Sarraf Shirazi, Alireza, and Ian Frigaard. "SlurryNet: Predicting Critical Velocities and Frictional Pressure Drops in Oilfield Suspension Flows." Energies 14, no. 5 (2021): 1263. http://dx.doi.org/10.3390/en14051263.

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Improving the accuracy of the slurry flow predictions in different operating flow regimes remains a major focus for multiphase flow research, and it is especially targeted at industrial applications such as oil and gas. In this paper we develop a robust integrated method consisting of an artificial neural network (ANN) and support vector regression (SVR) to estimate the critical velocity, the slurry flow regime change, and ultimately, the frictional pressure drop for a solid–liquid slurry flow in a horizontal pipe, covering wide ranges of flow and geometrical parameters. Three distinct dataset

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7

Kunii, Kohei, Takahiro Ishida, Yohann Duguet, and Takahiro Tsukahara. "Laminar–turbulent coexistence in annular Couette flow." Journal of Fluid Mechanics 879 (October 1, 2019): 579–603. http://dx.doi.org/10.1017/jfm.2019.666.

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Annular Couette flow is the flow between two coaxial cylinders driven by the axial translation of the inner cylinder. It is investigated using direct numerical simulation in long domains, with an emphasis on the laminar–turbulent coexistence regime found for marginally low values of the Reynolds number. Three distinct flow regimes are demonstrated as the radius ratio $\unicode[STIX]{x1D702}$ is decreased from 0.8 to 0.5 and finally to 0.1. The high-$\unicode[STIX]{x1D702}$ regime features helically shaped turbulent patches coexisting with laminar flow, as in planar shear flows. The moderate-$\

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8

Merritt, Angela, Belize Lane, and Charles Hawkins. "Classification and Prediction of Natural Streamflow Regimes in Arid Regions of the USA." Water 13, no. 3 (2021): 380. http://dx.doi.org/10.3390/w13030380.

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Understanding how natural variation in flow regimes influences stream ecosystem structure and function is critical to the development of effective stream management policies. Spatial variation in flow regimes among streams is reasonably well understood for streams in mesic regions, but a more robust characterization of flow regimes in arid regions is needed, especially to support biological monitoring and assessment programs. In this paper, we used long-term (41 years) records of mean daily streamflow from 287 stream reaches in the arid and semi-arid western USA to develop and compare several

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9

Ahmed, A., R. Manzoor, S. U. Islam, and H. Rahman. "Numerical investigation for flow over a square rod through a passive control method at various Reynolds numbers." Canadian Journal of Physics 98, no. 5 (2020): 425–32. http://dx.doi.org/10.1139/cjp-2019-0155.

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This work presents a numerical simulation performed to study the effect of Reynolds number (Re = 80–200) on fluid flow over a square rod attached to two small controlling rods using the Lattice Boltzmann method. For this reason, the spacing ratio between the control rods and main rod varies systematically from g = 0.5–5. Flow has been subdivided into three flow regimes based on spacing ratios. The first flow regime is considered at a small gap (g = 0.5, 1, and 1.5), the second flow regime is obtained at a moderate gap (g = 2, 2.5, and 3), and the third flow regime is considered a at large gap

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10

Yao, Jianfeng, Wenjuan Lou, Guohui Shen, Yong Guo, and Yuelong Xing. "Influence of Inflow Turbulence on the Flow Characteristics around a Circular Cylinder." Applied Sciences 9, no. 17 (2019): 3595. http://dx.doi.org/10.3390/app9173595.

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To study the influence of turbulence on the wind pressure and aerodynamic behavior of smooth circular cylinders, wind tunnel tests of a circular cylinder based on wind pressure testing were conducted for different wind speeds and turbulent flows. The tests obtained the characteristic parameters of mean wind pressure coefficient distribution, drag coefficient, lift coefficient and correlation of wind pressure for different turbulence intensities and of Reynolds numbers. These results were also compared with those obtained by previous researchers. The results show that the minimum drag coefficie

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11

CHURILOV, S. M. "Nonlinear stability of a stratified shear flow in the regime with an unsteady critical layer. Part 2. Arbitrary stratification of asymmetric flow." Journal of Fluid Mechanics 392 (August 10, 1999): 233–75. http://dx.doi.org/10.1017/s0022112099005443.

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A weakly nonlinear analysis of the downstream evolution of weakly unstable disturbances in a stably stratified mixing layer with a large Reynolds number is carried out. No other requirements are imposed upon velocity and density profiles, thus making it possible to overcome the restrictions placed in earlier studies (Brown & Stewartson 1978; Brown et al. 1981; Churilov & Shukhman 1987, 1988) by a particular choice of weakly supercritical flow models assuming symmetry. For each of the two critical layer regimes possible here, viscous and unsteady, evolution equations are obtained, their

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12

Cheng, K. C., and Y. W. Kim. "Flow Visualization Studies on Vortex Instability of Natural Convection Flow Over Horizontal and Slightly Inclined Constant-Temperature Plates." Journal of Heat Transfer 110, no. 3 (1988): 608–15. http://dx.doi.org/10.1115/1.3250536.

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Flow visualization experiments were performed in a low-speed wind tunnel to study vortex instability of laminar natural convection flow along inclined isothermally heated plates having inclination angles from the horizontal of θ = 0, 5, 10, 15 and 20 deg. The temperature difference between plate surface and ambient air ranged from ΔT = 15.5 to 37.5°C and the local Grashof number range was Grx = 1.02×106 to 2.13×108. Three characteristic flow regimes were identified as follows: a two-dimensional laminar flow, a transition regime for developing longitudinal vortices, and a turbulent regime after

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13

Nijjer, Japinder S., Duncan R. Hewitt, and Jerome A. Neufeld. "The dynamics of miscible viscous fingering from onset to shutdown." Journal of Fluid Mechanics 837 (January 5, 2018): 520–45. http://dx.doi.org/10.1017/jfm.2017.829.

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We examine the full ‘life cycle’ of miscible viscous fingering from onset to shutdown with the aid of high-resolution numerical simulations. We study the injection of one fluid into a planar two-dimensional porous medium containing another, more viscous fluid. We find that the dynamics are distinguished by three regimes: an early-time linearly unstable regime, an intermediate-time nonlinear regime and a late-time single-finger exchange-flow regime. In the first regime, the flow can be linearly unstable to perturbations that grow exponentially. We identify, using linear stability theory and num

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14

Kosmatskiy, Ya Ig, M. Yu Egorov, and V. D. Lychakov. "Flow analysis in seamless hot-extruded pipes with helical inner ribbing surface." Journal of Physics: Conference Series 2088, no. 1 (2021): 012011. http://dx.doi.org/10.1088/1742-6596/2088/1/012011.

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Abstract The article is devoted to numerical simulation of heat transfer processes occurring during the flow of a coolant in seamless hot-extrusion pipes with a spiral inner fin surface (TMK-IRS). A description of the numerical modeling technique is given along with the interface of the program used to create different types of internal fins. Thermohydraulic analysis of finned pipes for transient, turbulent and laminar flow regimes has been carried out. An estimate of the critical Reynolds number characterizing the transition to a turbulent regime, the nature of the transient flow regime in co

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15

Nikushchenko, Dmitry, Valery Pavlovsky, and Elena Nikushchenko. "Fluid Flow Development in a Pipe as a Demonstration of a Sequential Change in Its Rheological Properties." Applied Sciences 12, no. 6 (2022): 3058. http://dx.doi.org/10.3390/app12063058.

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The sequence of the process of changing the velocity profiles and the laws of resistance during the flow of a fluid in a pipe is considered. With the increasing of the Reynolds number, we obtain the transition of the flow regime from laminar to turbulent. In the presence of small additives of polymers, when the Toms effect is observed in the fluid flow, the turbulent regime changes with a further increase in the Reynolds number to another regime, the rheology of which leads to laminar velocity profiles and corresponding resistance laws. Then, with an increase in the Reynolds number for polymer

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16

Liu, Haihu, and Yonghao Zhang. "Lattice Boltzmann Simulation of Droplet Generation in a Microfluidic Cross-Junction." Communications in Computational Physics 9, no. 5 (2011): 1235–56. http://dx.doi.org/10.4208/cicp.231009.101110s.

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AbstractUsing the lattice Boltzmann multiphase model, numerical simulations have been performed to understand the dynamics of droplet formation in a microfluidic cross-junction. The influence of capillary number, flow rate ratio, viscosity ratio, and viscosity of the continuous phase on droplet formation has been systematically studied over a wide range of capillary numbers. Two different regimes, namely the squeezinglike regime and the dripping regime, are clearly identified with the transition occurring at a critical capillary number Cacr. Generally, large flow rate ratio is expected to prod

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17

Ren, Jie, Song Fu, and Rene Pecnik. "Linear instability of Poiseuille flows with highly non-ideal fluids." Journal of Fluid Mechanics 859 (November 16, 2018): 89–125. http://dx.doi.org/10.1017/jfm.2018.815.

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The objective of this work is to investigate linear modal and algebraic instability in Poiseuille flows with fluids close to their vapour–liquid critical point. Close to this critical point, the ideal gas assumption does not hold and large non-ideal fluid behaviours occur. As a representative non-ideal fluid, we consider supercritical carbon dioxide ($\text{CO}_{2}$) at a pressure of 80 bar, which is above its critical pressure of 73.9 bar. The Poiseuille flow is characterized by the Reynolds number ($Re=\unicode[STIX]{x1D70C}_{w}^{\ast }u_{r}^{\ast }h^{\ast }/\unicode[STIX]{x1D707}_{w}^{\ast

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18

Maxwell, James L., Nicholas Webb, Douglas Bradshaw, et al. "On “how to start a fire”, or transverse forced-convection, hyperbaric laser chemical vapor deposition of fibers and textiles." Textile Research Journal 84, no. 18 (2014): 1976–86. http://dx.doi.org/10.1177/0040517514527373.

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This work explores the transverse forced flow of precursor gases during hyperbaric pressure laser chemical vapor deposition (HP-LCVD). Axial and mass growth rates of carbon fibers are measured experimentally, and a numerical model is developed that provides fiber growth rates in both the mass-transport-limited (MTL) and kinetically limited (KL) regimes. It is found that the fiber’s transport-limited rate increases as the square root of the flow velocity, while simultaneously, the temperature drops with the inverse square root of the flow velocity. Growth is enhanced by forced flow so long as t

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19

Woo, Nam-Sub, Young-Ju Kim, and Young-Kyu Hwang. "Experimental Study on the Helical Flow in a Concentric Annulus With Rotating Inner Cylinder." Journal of Fluids Engineering 128, no. 1 (2005): 113–17. http://dx.doi.org/10.1115/1.2136923.

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This experimental study concerns the characteristics of vortex flow in a concentric annulus with a diameter ratio of 0.52, whose outer cylinder is stationary and inner one is rotating. Pressure losses and skin friction coefficients have been measured for fully developed laminar flows of water and of 0.4% aqueous solution of sodium carboxymethyl cellulose, respectively, when the inner cylinder rotates at the speed of 0-600rpm. The results of the present study show the effect of the bulk flow Reynolds number Re and Rossby number Ro on the skin friction coefficients. They also point to the existe

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20

Takeda, Kazuki, Yohann Duguet, and Takahiro Tsukahara. "Intermittency and Critical Scaling in Annular Couette Flow." Entropy 22, no. 9 (2020): 988. http://dx.doi.org/10.3390/e22090988.

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The onset of turbulence in subcritical shear flows is one of the most puzzling manifestations of critical phenomena in fluid dynamics. The present study focuses on the Couette flow inside an infinitely long annular geometry where the inner rod moves with constant velocity and entrains fluid, by means of direct numerical simulation. Although for a radius ratio close to unity the system is similar to plane Couette flow, a qualitatively novel regime is identified for small radius ratio, featuring no oblique bands. An analysis of finite-size effects is carried out based on an artificial increase o

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21

Schippa, Leonardo, Ferruccio Doghieri, Anna Pellegrino, and Elisa Pavesi. "Thixotropic Behavior of Reconstituted Debris-Flow Mixture." Water 13, no. 2 (2021): 153. http://dx.doi.org/10.3390/w13020153.

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Time-dependent rheological properties and thixotropy of reconstituted debris-flows samples taken from channel bank deposits are examined using a commercial rheometer equipped with a vane rotor geometric system. Sweep tests and creep tests were carried out involving mixtures having different grain concentrations ranging between 50% and 58%. Different initial conditions of the mixtures were considered in order to analyze the effects of aging and rejuvenation (thixotropy) over a short period of time and long period of time. Tested slurries show viscosity bifurcation, yield stress and time-depende

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22

Schippa, Leonardo, Ferruccio Doghieri, Anna Maria Pellegrino, and Elisa Pavesi. "Thixotropic Behavior of Reconstituted Debris-Flow Mixture." Water 13, no. 2 (2021): 153. http://dx.doi.org/10.3390/w13020153.

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Time-dependent rheological properties and thixotropy of reconstituted debris-flows samples taken from channel bank deposits are examined using a commercial rheometer equipped with a vane rotor geometric system. Sweep tests and creep tests were carried out involving mixtures having different grain concentrations ranging between 50% and 58%. Different initial conditions of the mixtures were considered in order to analyze the effects of aging and rejuvenation (thixotropy) over a short period of time and long period of time. Tested slurries show viscosity bifurcation, yield stress and time-depende

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23

Luo, S. C., and T. L. Gan. "Flow past two tandem circular cylinders of unequal diameter." Aeronautical Journal 96, no. 953 (1992): 105–14. http://dx.doi.org/10.1017/s0001924000024647.

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SummaryThe present work investigates the structure associated with flow past two tandem circular cylinders with a diameter ratio of 0·33. The smaller cylinder is always upstream. The two parameters varied in the present work are the spacing between the cylinders denoted by l/d2where l is the centre to centre spacing and d2 is the diameter of the downstream cylinder, and the Reynolds number Re based on d2 Just like the case of flow past two equal size cylinders, a critical spacing was found to exist. For spacing less than the critical value, shear layers that separate from the upstream cylinder

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24

Kološ, Ivan, Vladimíra Michalcová, and Lenka Lausová. "Numerical Analysis of Flow Around a Cylinder in Critical and Subcritical Regime." Sustainability 13, no. 4 (2021): 2048. http://dx.doi.org/10.3390/su13042048.

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Modeling the wind flow around cylindrical buildings is one of the problems within urban physics. Despite the simple geometry of the cylinder, it is an interesting physical phenomenon. Partial knowledge of flow field properties can be found in the literature, but in terms of their use for practical tasks, the data are still incomplete. The authors performed a numerical analysis of the flow around the smooth cylinder in the subcritical and critical regime for Reynolds numbers in the range of Re = 2.3 × 103 to 4 × 105. Turbulent flow was solved using LES model and the numerical solution was compa

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25

Jacimovski, Darko, Radmila Garic-Grulovic, Zeljko Grbavcic, Mihal Djuris, and Nevenka Boskovic-Vragolovic. "Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles." Chemical Industry 68, no. 1 (2014): 15–25. http://dx.doi.org/10.2298/hemind130207025j.

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Wall-to-bed momentum, heat and mass transfer in vertical liquid-solids flow, as well as in single phase flow, were studied. The aim of this investigation was to establish the analogy among those phenomena. Also, effect of particles concentration on momentum, heat and mass transfer was studied. The experiments in hydraulic transport were performed in a 25.4 mm I.D. cooper tube equipped with a steam jacket, using spherical glass particles of 1.94 mm in diameter and water as a transport fluid. The segment of the transport tube used for mass transfer measurements was inside coated with benzoic aci

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26

Mollaabbasi, R., and S. M. Taghavi. "Buoyant displacement flows in slightly non-uniform channels." Journal of Fluid Mechanics 795 (April 22, 2016): 876–913. http://dx.doi.org/10.1017/jfm.2016.232.

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We consider displacement flows in slightly diverging or converging plane channels. The two fluids are miscible and buoyancy is significant. We assume that the channel is oriented close to horizontal. Employing a classical lubrication approximation, we simplify the governing equations to furnish a semi-analytical solution for the flux functions. Then, we demonstrate how the non-uniformity of the displacement flow geometry can affect the propagation of the interface between the heavy and light fluids in time, for various parameters studied, e.g. the viscosity ratio, a buoyancy number and rheolog

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27

Temme, Franziska, Jenny V. Turton, Thomas Mölg, and Tobias Sauter. "Flow Regimes and Föhn Types Characterize the Local Climate of Southern Patagonia." Atmosphere 11, no. 9 (2020): 899. http://dx.doi.org/10.3390/atmos11090899.

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The local climate in Southern Patagonia is strongly influenced by the interaction between the topography and persistent westerlies, which can generate föhn events, dry and warm downslope winds. The upstream flow regime influences different föhn types which dictate the lee-side atmospheric response regarding the strength, spatial extent and phenomenology. We use a combination of observations from four automatic weather stations (AWSs) and high-resolution numerical modeling with the Weather Research and Forecasting (WRF) model for a region in Southern Patagonia (48° S–52° S, 72° W–76.5° W) inclu

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28

Privezencev, Aleksej, and Gennadij Fomenko. "Complex dynamics of the charged-particle beam with virtual cathode." Izvestiya VUZ. Applied Nonlinear Dynamics 2, no. 3 (1994): 56–68. https://doi.org/10.18500/0869-6632-1994-2-5-56-68.

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This paper presents numerical analysis of nonlinear virtual cathode dynamics in triode systems. It was found that different stationary unstable flow states transform into different oscillation regimes - nonlinear structures for a certain injection current range near the critical value. Further it was found that injected current perturbations cause interactions of the nonlinear structures and high-frequency mode is absorbed by lowfrequency one. When the flow interacts with multimode cavity at the certain beam coupling level and at the range of eigenmode frequencies a frequency locking regime is

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29

Zheng, Chuntai, Peng Zhou, Siyang Zhong, and Xin Zhang. "On the cylinder noise and drag reductions in different Reynolds number ranges using surface pattern fabrics." Physics of Fluids 35, no. 3 (2023): 035111. http://dx.doi.org/10.1063/5.0138074.

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This study experimentally investigates the potential of using surface pattern fabrics for the cylinder noise and drag control in different Reynolds number ranges. The aerodynamic and aeroacoustic effects were evaluated through the noise and force measurements in an anechoic wind tunnel. It was observed that the noise and drag reductions take place simultaneously but in different Reynolds number ranges, corresponding to the cylinder flow in different flow regimes, e.g., sub-critical, critical, and supercritical flow regimes. Microphone arc array measurements reveal that the suppression of the A

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30

XUE, MING, and DICK K. P. YUE. "Nonlinear free-surface flow due to an impulsively started submerged point sink." Journal of Fluid Mechanics 364 (June 10, 1998): 325–47. http://dx.doi.org/10.1017/s0022112098001335.

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The unsteady fully nonlinear free-surface flow due to an impulsively started submerged point sink is studied in the context of incompressible potential flow. For a fixed (initial) submergence h of the point sink in otherwise unbounded fluid, the problem is governed by a single non-dimensional physical parameter, the Froude number, [Fscr ]≡Q/4π(gh5)1/2, where Q is the (constant) volume flux rate and g the gravitational acceleration. We assume axisymmetry and perform a numerical study using a mixed-Eulerian–Lagrangian boundary-integral-equation scheme. We conduct systematic simulations varying t

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31

ANSONG, JOSEPH K., PATRICK J. KYBA, and BRUCE R. SUTHERLAND. "Fountains impinging on a density interface." Journal of Fluid Mechanics 595 (January 8, 2008): 115–39. http://dx.doi.org/10.1017/s0022112007009093.

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We present an experimental study of an axisymmetric turbulent fountain in a two-layer stratified environment. Interacting with the interface, the fountain is observed to exhibit three regimes of flow. It may penetrate the interface, but nonetheless return to the source where it spreads as a radially propagating gravity current; the return flow may be trapped at the interface where it spreads as a radially propagating intrusion or it may do both. These regimes have been classified using empirically determined regime parameters which govern the relative initial momentum of the fountain and the r

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32

CHANG, KEH-CHIN, and WEN-CHUNG WU. "A STUDY ON FLOW REGIME NEAR CRITICAL RAYLEIGH NUMBER FOR BUOYANCY-DRIVEN CAVITY FLOW." Modern Physics Letters B 19, no. 28n29 (2005): 1635–38. http://dx.doi.org/10.1142/s0217984905010098.

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A benchmark problem with air medium in a square cavity heated by a vertical side is studied in a Ra range near its critical value without using the usual model approximations, such as Boussinesq or low-Mach-number approximation. Two analysis methods of power spectrum and phase trajectory are adopted to distinguish the flow pattern in the cavity. It demonstrates how the flow evolves from transition to turbulent regimes with increasing Ra values.

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33

CLARKE, S. R., and E. R. JOHNSON. "Topographically forced long waves on a sheared coastal current. Part 1. The weakly nonlinear response." Journal of Fluid Mechanics 343 (July 25, 1997): 131–51. http://dx.doi.org/10.1017/s0022112097005685.

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The flow of a constant-vorticity current past coastal topography is investigated in the long-wave weakly nonlinear limit. In contrast to other near-critical weakly nonlinear systems this problem does not exhibit hydraulically controlled solutions. It is shown that near criticality the evolution of the vorticity interface is governed by a forced BDA (Benjamin–Davis–Acrivos) equation. The solutions of this equation are discussed and two distinct near-critical flow regimes are identified. Owing to the non-local nature of the forcing, the first of these regimes is characterized by quasi-steady sol

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SÁNCHEZ-SANZ, M., and A. VELAZQUEZ. "Vortex-induced vibration of a prism in internal flow." Journal of Fluid Mechanics 641 (November 13, 2009): 431–40. http://dx.doi.org/10.1017/s0022112009991893.

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In this article, we study the influence of solid-to-fluid density ratio m on the type of vortex-induced oscillation of a square section prism placed inside a two-dimensional channel. We assume that the solid body has neither structural damping nor spring restoring force. Accordingly, the prism equation of motion contains only inertia and aerodynamics forces. The problem is considered in the range of Reynolds numbers Re ∈ [50 200] (based on the prism cross-section height h) and channel widths H = H′/h ∈ [2.5 10]. We found that, for each Re and H, there is a critical mass ratio mc that separates

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Manneville, Paul, and Masaki Shimizu. "Transitional Channel Flow: A Minimal Stochastic Model." Entropy 22, no. 12 (2020): 1348. http://dx.doi.org/10.3390/e22121348.

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In line with Pomeau’s conjecture about the relevance of directed percolation (DP) to turbulence onset/decay in wall-bounded flows, we propose a minimal stochastic model dedicated to the interpretation of the spatially intermittent regimes observed in channel flow before its return to laminar flow. Numerical simulations show that a regime with bands obliquely drifting in two stream-wise symmetrical directions bifurcates into an asymmetrical regime, before ultimately decaying to laminar flow. The model is expressed in terms of a probabilistic cellular automaton of evolving von Neumann neighborho

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Sumner, Chloe, and Youra Taroyan. "Amplification of magnetic field twisting by a stagnation point flow." Astronomy & Astrophysics 642 (October 2020): A181. http://dx.doi.org/10.1051/0004-6361/202038761.

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Context. Flows are a common feature of many processes occurring in the solar atmosphere, such as the formation of prominences where evaporated plasma from the chromosphere condensates along thin prominence threads that are seen to twist and oscillate. Aim. We aim to investigate the twisting of these threads by plasma condensation during their formation. Methods. We introduce a simple model with fixed critical points where the flow speed matches the Alfvén speed. This allows us to study the problem separately in the sub-Alfvénic and super-Alfvénic regimes. The temporal and spatial evolution of

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Ota, T., H. Nishiyama, and Y. Taoka. "Flow Around an Elliptic Cylinder in the Critical Reynolds Number Regime." Journal of Fluids Engineering 109, no. 2 (1987): 149–55. http://dx.doi.org/10.1115/1.3242635.

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Flow around an elliptic cylinder of axis ratio 1:3 has been investigated experimentally in the critical Reynolds number regime on the basis of mean static pressure measurements along the cylinder surface and of hot-wire velocity measurements in the near wake. The critical Reynold number has been found to vary with the angle of attack α and attains a minimum around α = 5 to 10 deg. At the critical Reynolds number, the drag, lift, and moment coefficients change discontinuously, and the Strouhal number based on the upstream uniform flow velocity and the major axis length of the cylinder reaches a

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Wang, Qi Wen, Chao Zou, and Han Feng Wang. "Aerodynamic Force of a Cantilevered Cylinder in Uniform Flow and Turbulent Boundary Layer." Applied Mechanics and Materials 470 (December 2013): 499–503. http://dx.doi.org/10.4028/www.scientific.net/amm.470.499.

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The aerodynamic force and pressure distribution on a cantilevered cylinder with aspect ratio of 5 mounted in smooth uniform oncoming flow and turbulent boundary layer have been experimentally investigated. The tested Reynolds number ranges from 0.64×105 to 5.81×105, covering subcritical, critical and supercritical regimes. The results indicate that the aerodynamic drag of a cantilevered cylinder is smaller that that of 2D cylinder. The drag differs significantly along cylinder span because of the three dimensionality of the flow. The presence of turbulent boundary layer makes cylinder back pre

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Mocaër, Philippe, Michel Laguës, Uri Dai, and Guy Deutscher. "YBaCuO critical magnetic field Hc2 determination from the flow regime dissipation." Journal of the Less Common Metals 164-165 (October 1990): 1055–60. http://dx.doi.org/10.1016/0022-5088(90)90517-n.

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Alışkan, Yılmaz. "A Critical Look at Digital Media, the Intellectual Property Regime and Free Open Source Software." Erciyes İletişim Dergisi 11, no. 2 (2024): 813–27. http://dx.doi.org/10.17680/erciyesiletisim.1434384.

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This article examines how the intellectual property regime works in digital media and how free open source software is pushing the boundaries of the regime on the digital realm. The main purpose of this article is to highlight the differences that models of knowledge production can make in the process of building a participatory society. This article uses Michael Gibbons' Mode 1 and Mode 2 theories as a method. In the light of this theory, power relations in the production and distribution of knowledge are discussed. The Mode 2 model points to a commons-based model of knowledge production that

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41

Tarasov, V. M., and Yu D. Zemenkov. "Method of Calculation of Critical Flow Modes of a Gas-Liquid Mixture." Oil and Gas Technologies 148, no. 5 (2023): 57–59. http://dx.doi.org/10.32935/1815-2600-2023-148-5-57-59.

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The article describes a method for predicting the occurrence of a slug flow in oil and gas collecting pipelines and a method for determining the critical flow content of liquid in the pipeline to calculate the gas flow rate, which must be separated to maintain a plug-free regime.

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42

Zheng, Chuntai, Peng Zhou, Siyang Zhong, and Xin Zhang. "Experimental investigation on cylinder noise and its reductions by identifying aerodynamic sound sources in flow fields." Physics of Fluids 35, no. 3 (2023): 035103. http://dx.doi.org/10.1063/5.0138080.

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Through anechoic wind tunnel tests, this study comprehensively investigates the noise and drag reductions on a circular cylinder with dimples. Dimples built on a surface pattern fabric cover the cylinder surface as one of the passive flow control methods. The force, noise, and flow field measurements are performed at diameter-based Reynolds numbers ranging from [Formula: see text] to [Formula: see text], covering the sub-critical, critical, and supercritical regimes. The force and noise measurement results show that dimple fabric simultaneously reduces noise and drag in the critical regime. Th

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Fang, Ranran, Hongbo Zhu, Zekai Li, et al. "Temperature Effect on Capillary Flow Dynamics in 1D Array of Open Nanotextured Microchannels Produced by Femtosecond Laser on Silicon." Nanomaterials 10, no. 4 (2020): 796. http://dx.doi.org/10.3390/nano10040796.

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Capillary flow of water in an array of open nanotextured microgrooves fabricated by femtosecond laser processing of silicon is studied as a function of temperature using high-speed video recording. In a temperature range of 23–80 °C, the produced wicking material provides extremely fast liquid flow with a maximum velocity of 37 cm/s in the initial spreading stage prior to visco-inertial regime. The capillary performance of the material enhances with increasing temperature in the inertial, visco-inertial, and partially in Washburn flow regimes. The classic universal Washburn’s regime is observe

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Kordi, E., S. A. Ayyoubzadeh, M. Z. Ahmadi, and A. Zahiri. "Prediction of the lateral flow regime and critical depth in compound open channels." Canadian Journal of Civil Engineering 36, no. 1 (2009): 1–13. http://dx.doi.org/10.1139/l08-095.

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In this study, the common critical depth calculation in compound channels has been modified considering the effect of momentum transfer between the interface of a main channel and its floodplains. In noncorrected specific energy curves of a given slope, the flow is not necessarily entirely sub- or supercritical as it is in a single cross section and there is a possibility of both flow regimes at a certain stage, called the lateral mixed flow regimes, which makes the application of specific energy equation to determine the critical depth and transitional zone calculations questionable. In the p

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Dolgopolov, S. I. "Mathematical simulation of choking under self-oscillations in hydraulic systems with cavitating pumps of liquid-propellant rocket engines." Technical mechanics 2020, no. 4 (2020): 35–42. http://dx.doi.org/10.15407/itm2020.04.035.

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As known from the study of cavity flows in fixed channels (Venturi tube), with decreasing channel outlet pressure there comes a point where the flow rate ceases to increase. To increase the flow rate, the inlet pressure must be increased. This phenomenon of flow rate limitation at a fixed inlet pressure is due to a critical regime of cavity flow at the narrowest cross-section and is termed choking. Impeller pumps also exhibit choking regimes described by the so-called chocking characteristic, which relates the critical pump flow rate to the inlet pressure. This work is aimed at extending a hyd

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TADIĆ, BOSILJKA, G. J. RODGERS, and STEFAN THURNER. "TRANSPORT ON COMPLEX NETWORKS: FLOW, JAMMING AND OPTIMIZATION." International Journal of Bifurcation and Chaos 17, no. 07 (2007): 2363–85. http://dx.doi.org/10.1142/s0218127407018452.

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Many transport processes on networks depend crucially on the underlying network geometry, although the exact relationship between the structure of the network and the properties of transport processes remain elusive. In this paper, we address this question by using numerical models in which both structure and dynamics are controlled systematically. We consider the traffic of information packets that include driving, searching and queuing. We present the results of extensive simulations on two classes of networks; a correlated cyclic scale-free network and an uncorrelated homogeneous weakly clu

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Girfoglio, M., F. De Rosa, G. Coppola, and L. de Luca. "Unsteady critical liquid sheet flows." Journal of Fluid Mechanics 821 (May 18, 2017): 219–47. http://dx.doi.org/10.1017/jfm.2017.241.

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The unsteady global dynamics of a gravitational liquid sheet interacting with a one-sided adjacent air enclosure (commonly referred to as nappe oscillation configuration) is addressed under the assumptions of potential flow and the presence of surface tension effects. From a theoretical viewpoint the problem is challenging, because from previous literature it is known that the equation governing the evolution of small disturbances exhibits a singularity at the vertical station where the local flow velocity equals the capillary wave velocity (local critical condition), although the solution to

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Salazar, Juan Fernando, Juan Camilo Villegas, Angela María Rendón, et al. "Scaling properties reveal regulation of river flows in the Amazon through a “forest reservoir”." Hydrology and Earth System Sciences 22, no. 3 (2018): 1735–48. http://dx.doi.org/10.5194/hess-22-1735-2018.

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Abstract. Many natural and social phenomena depend on river flow regimes that are being altered by global change. Understanding the mechanisms behind such alterations is crucial for predicting river flow regimes in a changing environment. Here we introduce a novel physical interpretation of the scaling properties of river flows and show that it leads to a parsimonious characterization of the flow regime of any river basin. This allows river basins to be classified as regulated or unregulated, and to identify a critical threshold between these states. We applied this framework to the Amazon riv

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Nicks, Bradley Scott, Ernesto Barraza-Valdez, Sahel Hakimi, et al. "High-Density Dynamics of Laser Wakefield Acceleration from Gas Plasmas to Nanotubes." Photonics 8, no. 6 (2021): 216. http://dx.doi.org/10.3390/photonics8060216.

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The electron dynamics of laser wakefield acceleration (LWFA) is examined in the high-density regime using particle-in-cell simulations. These simulations model the electron source as a target of carbon nanotubes. Carbon nanotubes readily allow access to near-critical densities and may have other advantageous properties for potential medical applications of electron acceleration. In the near-critical density regime, electrons are accelerated by the ponderomotive force followed by the electron sheath formation, resulting in a flow of bulk electrons. This behavior represents a qualitatively disti

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Robinet, J. C., and X. Gloerfelt. "Instabilities in non-ideal fluids." Journal of Fluid Mechanics 880 (October 4, 2019): 1–4. http://dx.doi.org/10.1017/jfm.2019.719.

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The recent study of Ren et al. (J. Fluid Mech., vol. 871, 2019, pp. 831–864) investigated the hydrodynamic linear stability of a compressible boundary layer over an insulated flat plate for a non-ideal gas (supercritical $\text{CO}_{2}$). In particular, the authors showed that in the transcritical regime (across the pseudo-critical line) the flow is strongly convectively unstable due to the co-existence of two unstable modes: Mode I, related to Tollmien–Schlichting instabilities and a new inviscid two-dimensional mode (Mode II) with a spatial growth rate one order of magnitude larger than Mode

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