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Articoli di riviste sul tema "Turbulence"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Atac, Omer Faruk, Hyunsu Lee, and Seoksu Moon. "Detecting ultrafast turbulent oscillations in near-nozzle discharged liquid jet using x-ray phase-contrast imaging with MHz frequency." Physics of Fluids 35, no. 4 (2023): 045102. http://dx.doi.org/10.1063/5.0143351.

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Characteristics of a discharged liquid jet in near-nozzle are determined by the in-flow turbulences generated by the evolution of inflow vortices and cavitation. High-fidelity simulations have indicated that such physical processes can generate ultrafast turbulent fluctuations (in the range of MHz) originating from the nature of turbulence by the interaction between the large and small-scale turbulence in the flow. Detecting ultrafast turbulent oscillations while resolving small-scale turbulences in the optically dense near-nozzle liquid jet has not been observed through experimental methods s

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2

Souza, José Francisco Almeida de, José Luiz Lima de Azevedo, Leopoldo Rota de Oliveira, Ivan Dias Soares, and Maurício Magalhães Mata. "TURBULENCE MODELING IN GEOPHYSICAL FLOWS – PART I – FIRST-ORDER TURBULENT CLOSURE MODELING." Revista Brasileira de Geofísica 32, no. 1 (2014): 31. http://dx.doi.org/10.22564/rbgf.v32i1.395.

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ABSTRACT. The usage of so-called turbulence closure models within hydrodynamic circulation models comes from the need to adequately describe vertical mixing processes. Even among the classical turbulence models; that is, those based on the Reynolds decomposition technique (Reynolds Averaged Navier-Stokes – RANS), there is a variety of approaches that can be followed for the modeling of turbulent flows (second moment) of momentum, heat, salinity, and other properties. Essentially, these approaches are divided into those which use the concept of turbulent viscosity/diffusivity in the modeling of

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3

Bašták Ďurán, Ivan, and Pascal Marquet. "Les travaux sur la turbulence : les origines, Toucans, Cost-ES0905 et influence de l'entropie." La Météorologie, no. 112 (2021): 079. http://dx.doi.org/10.37053/lameteorologie-2021-0023.

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Le schéma de turbulence Toucans est utilisé dans la configuration opérationnelle Alaro du modèle Aladin depuis début 2015. Son développement a été initié, guidé et en grande partie conçu par Jean-François Geleyn. Ce développement a commencé avec le prédécesseur du schéma Toucans, le schéma « pseudo-pronostique » en énergie cinétique turbulente, lui-même basé sur l'ancien schéma de turbulence de Louis, mais étendu dans Toucans à un schéma pronostique. Le schéma Toucans a pour objectif de traiter de manière cohérente les fonctions qui dépendent de la stabilité verticale de l'atmosphère, de l'inf

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4

Liu, Xianlong, Fei Wang, Minghui Zhang, and Yangjian Cai. "Effects of Atmospheric Turbulence on Lensless Ghost Imaging with Partially Coherent Light." Applied Sciences 8, no. 9 (2018): 1479. http://dx.doi.org/10.3390/app8091479.

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Ghost imaging with partially coherent light through two kinds of atmospheric turbulences: monostatic turbulence and bistatic turbulence, is studied, both theoretically and experimentally. Based on the optical coherence theory and the extended Huygens–Fresnel integral, the analytical imaging formulae in two kinds of turbulence have been derived with the help of a tensor method. The visibility and quality of the ghost image in two different atmospheric turbulences are discussed in detail. Our results reveal that in bistatic turbulence, the visibility and quality of the image decrease with the in

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5

Cortes, Franco L., and Santiago Márquez Damián. "Modificación del Modelo k-omega SST para la Obtención del Perfil de Energía Cinética Turbulenta: Flujo en Placa Plana." Mecánica Computacional 41, no. 6 (2025): 333–41. https://doi.org/10.70567/mc.v41i6.33.

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El presente trabajo aborda la formulación del modelo de turbulencia k-omega SST, incorporando las correcciones viscosas propuestas por Wilcox (Wilcox D.C , Turbulence Modeling for CFD, (1998)). El propósito principal es mejorar la aproximación al perfil de energía cinética turbulenta cerca de los bordes sólidos, manteniendo la independencia de la tasa de disipación específica respecto al valor del flujo libre. Como resultado las ecuaciones para la energía cinética turbulenta y la disipación específica obtenidas se asemejan al modelo k - omega SST, incluyendo coeficientes variables en función d

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6

Marxen, Olaf, and Tamer A. Zaki. "Turbulence in intermittent transitional boundary layers and in turbulence spots." Journal of Fluid Mechanics 860 (December 5, 2018): 350–83. http://dx.doi.org/10.1017/jfm.2018.822.

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Direct numerical simulation data of bypass transition in flat-plate boundary layers are analysed to examine the characteristics of turbulence in the transitional regime. When intermittency is 50 % or less, the flow features a juxtaposition of turbulence spots surrounded by streaky laminar regions. Conditionally averaged turbulence statistics are evaluated within the spots, and are compared to standard time averaging in both the transition region and in fully turbulent boundary layers. The turbulent-conditioned root-mean-square levels of the streamwise velocity perturbations are notably elevate

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7

Baumert, H. Z., and H. Peters. "Turbulence closure: turbulence, waves and the wave-turbulence transition – Part 1: Vanishing mean shear." Ocean Science Discussions 5, no. 4 (2008): 545–80. http://dx.doi.org/10.5194/osd-5-545-2008.

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Abstract. A new two-equation, closure-like turbulence model for stably stratified flows is introduced which uses the turbulent kinetic energy (K) and the turbulent enstrophy (Ω) as primary variables. It accounts for mean shear – and internal wave-driven mixing in the two limits of mean shear and no waves and waves but no mean shear, respectively. The traditional TKE balance is augmented by an explicit energy transfer from internal waves to turbulence. A modification of the Ω-equation accounts for the effect of the waves on the turbulence time and space scales. The latter is based on the assump

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8

Xie, Aojie, Wenhui Yan та Junwei Zhou. "Calculation of a turbulent boundary layer on a flat plate using the PAFV-ω turbulence model". Journal of Physics: Conference Series 2977, № 1 (2025): 012049. https://doi.org/10.1088/1742-6596/2977/1/012049.

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Abstract To advance the creation of more efficient turbulence models and enhance the precision of numerical simulations of turbulent boundary layer flow, in this paper, based on the PAFV turbulence model and K-ω turbulence model, a new PAFV-ω turbulence model is raised, which is used for the computation of compressible fluids and requires only one empirical coefficient. A novel turbulence model was developed and numerically simulated for turbulent boundary layer flow without pressure gradient on a flat plate using the OpenFOAM software platform. Distribution patterns of mean velocity and trans

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9

Baumert, H. Z., and H. Peters. "Turbulence closure: turbulence, waves and the wave-turbulence transition – Part 1: Vanishing mean shear." Ocean Science 5, no. 1 (2009): 47–58. http://dx.doi.org/10.5194/os-5-47-2009.

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Abstract. This paper extends a turbulence closure-like model for stably stratified flows into a new dynamic domain in which turbulence is generated by internal gravity waves rather than mean shear. The model turbulent kinetic energy (TKE, K) balance, its first equation, incorporates a term for the energy transfer from internal waves to turbulence. This energy source is in addition to the traditional shear production. The second variable of the new two-equation model is the turbulent enstrophy (Ω). Compared to the traditional shear-only case, the Ω-equation is modified to account for the effect

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10

Donnelly, Russell J., and Charles E. Swanson. "Quantum turbulence." Journal of Fluid Mechanics 173 (December 1986): 387–429. http://dx.doi.org/10.1017/s0022112086001210.

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We present a review of quantum turbulence, that is, the turbulent motion of quantized vortex lines in superfluid helium. Our discussion concentrates on the turbulence produced by steady, uniform heat flow in a pipe, but touches on other turbulent flows as well. We have attempted to motivate the study of quantum turbulence and discuss briefly its connection with classical turbulence. We include background on the two-fluid model and mutual friction theory, examples of modern experimental techniques, and a brief survey of the phenomenology. We discuss the important recent insights that vortex dyn

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11

Ding Xiao-Guan, Zhao Kai-Jun, Xie Yao-Yu, et al. "Effects of turbulence spreading and symmetry breaking on edge shear flow during sawtooth cycles in J-TEXT tokamak." Acta Physica Sinica 74, no. 4 (2025): 0. https://doi.org/10.7498/aps.74.20241364.

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The effect of sawteeth on plasma performance and transport in the plasmas of tokamak is an important issue in the fusion field. Sawtooth oscillations can trigger heat and turbulence pulses that propagate into the edge plasmas, and thus enhance the edge shear flow and induce a transition from low confinement mode to high confinement mode. The influences of turbulence spreading and symmetry breaking on edge shear flow with sawtooth crashes are observed in the J-TEXT tokamak. The edge plasma turbulence and shear flow were measured using a fast reciprocating electrostatic probe array. The experime

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12

Wang, Zhenchuan, Guoli Qi, and Meijun Li. "Discussion on improved method of turbulence model for supercritical water flow and heat transfer." Thermal Science 24, no. 5 Part A (2020): 2729–41. http://dx.doi.org/10.2298/tsci190813007w.

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The turbulence model fails in supercritical fluid-flow and heat transfer simulation, owing to the drastic change of thermal properties. The inappropriate buoyancy effect model and the improper turbulent Prandtl number model are several of these factors lead to the original low-Reynolds number turbulence model unable to predict the wall temperature for vertically heated tubes under the deteriorate heat transfer conditions. This paper proposed a simplified improved method to modify the turbulence model, using the generalized gradient diffusion hypothesis approximation model for the production te

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13

Wang, B. B., G. P. Zank, L. Adhikari, and L. L. Zhao. "On the Conservation of Turbulence Energy in Turbulence Transport Models." Astrophysical Journal 928, no. 2 (2022): 176. http://dx.doi.org/10.3847/1538-4357/ac596e.

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Abstract Zank et al. developed models describing the transport of low-frequency incompressible and nearly incompressible turbulence in inhomogeneous flows. The formalism was based on expressing the fluctuating variables in terms of the Elsässar variables and then taking “moments” subject to various closure hypotheses. The turbulence transport models are different according to whether the plasma beta regime is large, of order unity, or small. Here, we show explicitly that the three sets of turbulence transport models admit a conservation representation that resembles the well-known WKB transpor

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14

Kadantsev, Evgeny, Evgeny Mortikov, Andrey Glazunov, Nathan Kleeorin, and Igor Rogachevskii. "On dissipation timescales of the basic second-order moments: the effect on the energy and flux budget (EFB) turbulence closure for stably stratified turbulence." Nonlinear Processes in Geophysics 31, no. 3 (2024): 395–408. http://dx.doi.org/10.5194/npg-31-395-2024.

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Abstract. The dissipation rates of the basic second-order moments are the key parameters playing a vital role in turbulence modelling and controlling turbulence energetics and spectra and turbulent fluxes of momentum and heat. In this paper, we use the results of direct numerical simulations (DNSs) to evaluate dissipation rates of the basic second-order moments and revise the energy and flux budget (EFB) turbulence closure theory for stably stratified turbulence. We delve into the theoretical implications of this approach and substantiate our closure hypotheses through DNS data. We also show w

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15

MIYAUCHI, Toshio. "Turbulence and Turbulent Combustion." TRENDS IN THE SCIENCES 19, no. 4 (2014): 4_44–4_48. http://dx.doi.org/10.5363/tits.19.4_44.

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16

Volino, R. J., and T. W. Simon. "Boundary Layer Transition Under High Free-Stream Turbulence and Strong Acceleration Conditions: Part 2—Turbulent Transport Results." Journal of Heat Transfer 119, no. 3 (1997): 427–32. http://dx.doi.org/10.1115/1.2824115.

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Measurements from heated boundary layers along a concave-curved test wall subject to high (initially 8 percent) free-stream turbulence intensity and strong (K = (ν/U∞2 dU∞/dx, as high as 9 × 10−6) acceleration are presented and discussed. Conditions for the experiments were chosen to simulate those present on the downstream half of the pressure side of a gas turbine airfoil. Turbulence statistics, including the turbulent shear stress, the turbulent heat flux, and the turbulent Prandtl number are presented. The transition zone is of extended length in spite of the high free-stream turbulence le

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17

SHAKINA, N. P., and E. N. SKRIPTUNOVA. "STATE OF THE ART IN STUDYING AND FORECASTING AVIATION AFFECTING TURBULENCE IN THE FREE ATMOSPHERE." Meteorologiya i Gidrologiya, no. 8 (August 2024): 104–25. https://doi.org/10.52002/0130-2906-2024-8-104-125.

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Three main physical processes are responsible for generation of turbulence affecting the aircraft: (1) hydrodynamic instability of the airflow stratified in wind and temperature (Kelvin-Helmholtz instability), which manifests itself in origination of turbulent patches called clear-air turbulence (CAT) in the free atmosphere; (2) breaking of large-amplitude mountain waves over the obstacles and at their leeward slopes, which causes so called orographic turbulence or mountain wave turbulence (MWT); (3) outflow of highly turbulent air from convective storms, which leads to the formation in their

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18

LEVICH, E. "NEW DEVELOPMENTS AND CLASSICAL THEORIES OF TURBULENCE." International Journal of Modern Physics B 10, no. 18n19 (1996): 2325–92. http://dx.doi.org/10.1142/s0217979296001057.

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In this paper we review certain classical and modern concepts pertinent for the theory of developed turbulent flows. We begin by introducing basic facts concerning the properties of the Navier-Stokes equation with the emphasis on invariant properties of the vorticity field. Then we discuss classical semiempirical approaches to developed turbulence which for a long time have constituted a basis for engineering solutions of turbulent flows problems. We do it for two examples, homogeneous isotropic turbulence and flat channel turbulent flow. Next we discuss the insufficiency of classical semi-emp

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19

Liang, Shi-Min, Jian-Fu Zhang, Na-Na Gao, and Hua-Ping Xiao. "Magnetic-reconnection-driven Turbulence and Turbulent Reconnection Acceleration." Astrophysical Journal 952, no. 2 (2023): 93. http://dx.doi.org/10.3847/1538-4357/acdc18.

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Abstract This paper employs an MHD-PIC method to perform numerical simulations of magnetic-reconnection-driven turbulence and turbulent reconnection acceleration of particles. Focusing on the dynamics of the magnetic reconnection, the properties of self-driven turbulence, and the behavior of particle acceleration, we find the following: (1) When reaching a statistically steady state of the self-driven turbulence, the magnetic energy is almost released by 50%, while the kinetic energy of the fluid increases by no more than 15%. (2) The properties of reconnection-driven turbulence are more compl

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20

Bałdyga, J., and R. Pohorecki. "Influence of Turbulent Mechanical Stresses on Microorganisms." Applied Mechanics Reviews 51, no. 1 (1998): 121–40. http://dx.doi.org/10.1115/1.3098987.

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Many phenomena depend on the features of the fine-scale structure of turbulence, including its intermittency. This article discusses the problem of the turbulent “shear” in biotechnology including the effect of the shear stress on particles (cells, flocs, cells immobilized on microcarriers). Traditionally, the effect of intermittency has not been taken into account in the shear problem and the theory of isotropic turbulence introduced by Kolmogorov (1941) based on average values of the rate of kinetic energy dissipation, velocity fluctuactions, rates of strain, turbulent stresses etc. has been

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21

Tsai, Wu-ting, Shi-ming Chen, and Guan-hung Lu. "Numerical Evidence of Turbulence Generated by Nonbreaking Surface Waves." Journal of Physical Oceanography 45, no. 1 (2015): 174–80. http://dx.doi.org/10.1175/jpo-d-14-0121.1.

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AbstractNumerical simulation of monochromatic surface waves propagating over a turbulent field is conducted to reveal the mechanism of turbulence production by nonbreaking waves. The numerical model solves the primitive equations subject to the fully nonlinear boundary conditions on the exact water surface. The result predicts growth rates of turbulent kinetic energy consistent with previous measurements and modeling. It also validates the observed horizontal anisotropy of the near-surface turbulence that the spanwise turbulent intensity exceeds the streamwise component. Such a flow structure

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22

Verma, Mahendra K. "Variable energy flux in turbulence." Journal of Physics A: Mathematical and Theoretical 55, no. 1 (2021): 013002. http://dx.doi.org/10.1088/1751-8121/ac354e.

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Abstract In three-dimensional hydrodynamic turbulence forced at large length scales, a constant energy flux Π u flows from large scales to intermediate scales, and then to small scales. It is well known that for multiscale energy injection and dissipation, the energy flux Π u varies with scales. In this review we describe this principle and show how this general framework is useful for describing a variety of turbulent phenomena. Compared to Kolmogorov’s spectrum, the energy spectrum steepens in turbulence involving quasi-static magnetofluid, Ekman friction, stable stratification, magnetohydro

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23

Liu, Zhenchen, Peiqing Liu, Hao Guo, and Tianxiang Hu. "Experimental investigations of turbulent decaying behaviors in the core-flow region of a propeller wake." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 2 (2019): 319–29. http://dx.doi.org/10.1177/0954410019865702.

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This work investigates the turbulent decaying behaviors downstream of a propeller in the core-flow region. Both axial and tangential velocity fluctuations behind a two-bladed propeller were measured using a stationary hot-wire probe. Unexpectedly, the complex near-wake core-flow of the propeller is found to show a similar decay characteristic of homogeneous turbulence, such as grid turbulence. The decay of turbulence intensity is found to be dominated by the level of periodic velocity fluctuations, showing a similar behavior of the homogenous and isotropic turbulence. This turbulent decaying b

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24

Blackmore, T., W. M. J. Batten, and A. S. Bahaj. "Influence of turbulence on the wake of a marine current turbine simulator." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470, no. 2170 (2014): 20140331. http://dx.doi.org/10.1098/rspa.2014.0331.

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Marine current turbine commercial prototypes have now been deployed and arrays of multiple turbines under design. The tidal flows in which they operate are highly turbulent, but the characteristics of the inflow turbulence have not being considered in present design methods. This work considers the effects of inflow turbulence on the wake behind an actuator disc representation of a marine current turbine. Different turbulence intensities and integral length scales were generated in a large eddy simulation using a gridInlet, which produces turbulence from a grid pattern on the inlet boundary. T

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Reichl, Brandon G., Dong Wang, Tetsu Hara, Isaac Ginis, and Tobias Kukulka. "Langmuir Turbulence Parameterization in Tropical Cyclone Conditions." Journal of Physical Oceanography 46, no. 3 (2016): 863–86. http://dx.doi.org/10.1175/jpo-d-15-0106.1.

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AbstractThe Stokes drift of surface waves significantly modifies the upper-ocean turbulence because of the Craik–Leibovich vortex force (Langmuir turbulence). Under tropical cyclones the contribution of the surface waves varies significantly depending on complex wind and wave conditions. Therefore, turbulence closure models used in ocean models need to explicitly include the sea state–dependent impacts of the Langmuir turbulence. In this study, the K-profile parameterization (KPP) first-moment turbulence closure model is modified to include the explicit Langmuir turbulence effect, and its perf

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26

HORCHANI, SAMAH CHEMLI, and MAHMOUD ZOUAOUI. "ENVIRONMENT TURBULENCE EFFECT ON THE DYNAMICS OF INTELLECTUAL CAPITAL ACCUMULATION AND AMBIDEXTROUS INNOVATION." International Journal of Innovation Management 25, no. 05 (2021): 2150058. http://dx.doi.org/10.1142/s1363919621500584.

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The aim of this paper is to study the influence of the environment on the link between intellectual capital and ambidextrous innovation. The environment has been considered taking into account the technological turbulence and the market turbulence. Using a questionnaire survey approach, data were obtained from 155 directors representing Tunisian SMEs. Two main theoretical implications were highlighted. The first is the extent of the intellectual capital contribution, with its human, organizational and relational components, to the reading of the ambidextrous innovation within the organization.

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Thole, K. A., and D. G. Bogard. "High Freestream Turbulence Effects on Turbulent Boundary Layers." Journal of Fluids Engineering 118, no. 2 (1996): 276–84. http://dx.doi.org/10.1115/1.2817374.

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High freestream turbulence levels significantly alter the characteristics of turbulent boundary layers. Numerous studies have been conducted with freestreams having turbulence levels of 7 percent or less, but studies using turbulence levels greater than 10 percent have been essentially limited to the effects on wall shear stress and heat transfer. This paper presents measurements of the boundary layer statistics for the interaction between a turbulent boundary layer and a freestream with turbulence levels ranging from 10 to 20 percent. The boundary layer statistics reported in this paper inclu

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Radomsky, R. W., and K. A. Thole. "Measurements and Predictions of a Highly Turbulent Flowfield in a Turbine Vane Passage." Journal of Fluids Engineering 122, no. 4 (2000): 666–76. http://dx.doi.org/10.1115/1.1313244.

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As highly turbulent flow passes through downstream airfoil passages in a gas turbine engine, it is subjected to a complex geometry designed to accelerate and turn the flow. This acceleration and streamline curvature subject the turbulent flow to high mean flow strains. This paper presents both experimental measurements and computational predictions for highly turbulent flow as it progresses through a passage of a gas turbine stator vane. Three-component velocity fields at the vane midspan were measured for inlet turbulence levels of 0.6%, 10%, and 19.5%. The turbulent kinetic energy increased

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Sullivan, Peter P., and James C. McWilliams. "Oceanic Frontal Turbulence." Journal of Physical Oceanography 54, no. 2 (2024): 333–58. http://dx.doi.org/10.1175/jpo-d-23-0033.1.

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Abstract Upper-ocean turbulence results from a complex set of interactions between submesoscale turbulence and local boundary layer processes. The interaction between larger-scale currents and turbulent fluctuations is two-way: large-scale shearing motions generate turbulence, and the resulting coherent turbulent fluxes of momentum and buoyancy feed back onto the larger flow. Here we examine the evolution and role of turbulence in the intensification, instability, arrest, and decay (i.e., the life cycle) of a dense filament undergoing frontogenesis in the upper-ocean boundary layer, i.e., cold

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Stieger, R. D., and H. P. Hodson. "The Unsteady Development of a Turbulent Wake Through a Downstream Low-Pressure Turbine Blade Passage." Journal of Turbomachinery 127, no. 2 (2005): 388–94. http://dx.doi.org/10.1115/1.1811094.

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This paper presents two-dimensional LDA measurements of the convection of a wake through a low-pressure turbine cascade. Previous studies have shown the wake convection to be kinematic, but have not provided details of the turbulent field. The spatial resolution of these measurements has facilitated the calculation of the production of turbulent kinetic energy, and this has revealed a mechanism for turbulence production as the wake convects through the blade row. The measured ensemble-averaged velocity field confirmed the previously reported kinematics of wake convection while the measurements

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Pinsky, Mark, and Alexander Khain. "Convective and Turbulent Motions in Nonprecipitating Cu. Part III: Characteristics of Turbulence Motions." Journal of the Atmospheric Sciences 80, no. 2 (2023): 457–71. http://dx.doi.org/10.1175/jas-d-21-0223.1.

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Abstract Velocity field in a nonprecipitating Cu under BOMEX conditions, simulated by SAM with 10-m resolution and spectral bin microphysics is separated into the convective part and the turbulent part, using a wavelet filtering. In Part II of the study properties of convective motions of this Cu were investigated. Here in Part III of the study, the parameters of cloud turbulence are calculated in the cloud updraft zone at different stages of cloud development. The main points of this study are (i) application of a fine-scale LES model of a single convective cloud allowed a direct estimation o

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Reis, J. C., and C. H. Kruger. "Turbulence suppression in combustion-driven magnetohydrodynamic channels." Journal of Fluid Mechanics 188 (March 1988): 147–57. http://dx.doi.org/10.1017/s0022112088000679.

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The effects of a magnetic field on core turbulence, mean-velocity boundary-layer profiles, turbulence-intensity boundary-layer profiles and turbulent spectral-energy distributions have been experimentally determined for combustion-driven magneto-hydrodynamic (MHD) flows. The turbulence suppression of the core was found to be similar to that of liquid-metal MHD flows, even though the turbulent structure was entirely different. The mean-velocity and turbulence-intensity boundary-layer profiles were affected much less than those of liquid-metal flows, primarily because the low-temperature thermal

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Dower, John F., Pierre Pepin, and William C. Leggett. "Enhanced gut fullness and an apparent shift in size selectivity by radiated shanny (Ulvaria subbifurcata) larvae in response to increased turbulence." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 1 (1998): 128–42. http://dx.doi.org/10.1139/f97-225.

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We studied the relationship between microscale turbulence and feeding success of larval radiated shanny (Ulvaria subbifurcata) in Conception Bay, Newfoundland, during a 3-week period in July-August 1995. Although previous studies had suggested that the relationship between turbulent velocity and larval feeding rates should be dome shaped, we found no evidence of such a functional relationship. Rather, differences in larval feeding success were evident only when days were grouped as either "high turbulence" or "low turbulence" on the basis of Richardson number. Feeding conditions (i.e., prey co

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Dai, Qi, Kun Luo, Tai Jin, and Jianren Fan. "Direct numerical simulation of turbulence modulation by particles in compressible isotropic turbulence." Journal of Fluid Mechanics 832 (October 26, 2017): 438–82. http://dx.doi.org/10.1017/jfm.2017.672.

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In this paper, a systematic investigation of turbulence modulation by particles and its underlying physical mechanisms in decaying compressible isotropic turbulence is performed by using direct numerical simulations with the Eulerian–Lagrangian point-source approach. Particles interact with turbulence through two-way coupling and the initial turbulent Mach number is 1.2. Five simulations with different particle diameters (or initial Stokes numbers, $St_{0}$) are conducted while fixing both their volume fraction and particle densities. The underlying physical mechanisms responsible for turbulen

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NAKABAYASHI, Koichi, Osami KITOH, and Yoshitaka KATOU. "Turbulence Statistics of CouettePoiseuille Turbulent Flow. 1st Report. Turbulence Intensities." Transactions of the Japan Society of Mechanical Engineers Series B 64, no. 626 (1998): 3272–78. http://dx.doi.org/10.1299/kikaib.64.3272.

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36

Yamamoto, K., T. Ishida, T. Watanabe, and K. Nagata. "Experimental and numerical investigation of compressibility effects on velocity derivative flatness in turbulence." Physics of Fluids 34, no. 5 (2022): 055101. http://dx.doi.org/10.1063/5.0085423.

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Abstract (sommario):

Compressibility effects on the velocity derivative flatness [Formula: see text] are investigated by experiments with opposing arrays of piston-driven synthetic jet actuators (PSJAs) and direct numerical simulations (DNS) of statistically steady compressible isotropic turbulence and temporally evolving turbulent planar jets with subsonic or supersonic jet velocities. Experiments using particle image velocimetry show that nearly homogeneous isotropic turbulence is generated at the center of a closed box from interactions between supersonic synthetic jets. The dependencies of [Formula: see text]

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37

Zhu, Yunzhou, Huan Nie, Qian Liu, Yi Yang, and Jianlei Zhang. "Research on the Use of an Ocean Turbulence Bubble Simulation Model to Analyze Wireless Optical Transmission Characteristics." Electronics 13, no. 13 (2024): 2626. http://dx.doi.org/10.3390/electronics13132626.

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Abstract (sommario):

Turbulent vortices with uneven refractive indices and sizes affect the transmission quality of laser beams in seawater, diminishing the performance of underwater wireless optical communication systems. Currently, the phase screen simulation model constrains the range of turbulent vortex scales that can be analyzed, and the mutual restrictions of the phase screen parameters are not suitable for use on large-scale turbulent vortices. Referring to the formation process of turbulent vortices based on Kolmogorov’s turbulence structure energy theory, this study abstractly models the process and simu

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38

Farrell, Brian F., and Petros J. Ioannou. "A Theory of Baroclinic Turbulence." Journal of the Atmospheric Sciences 66, no. 8 (2009): 2444–54. http://dx.doi.org/10.1175/2009jas2989.1.

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Abstract Understanding the physical mechanism maintaining fluid turbulence remains a fundamental theoretical problem. The two-layer model is an analytically and computationally simple system in which the dynamics of turbulence can be conveniently studied; in this work, a maximally simplified model of the statistically steady turbulent state in this system is constructed to isolate and identify the essential mechanism of turbulence. In this minimally complex turbulence model the effects of nonlinearity are parameterized using an energetically consistent stochastic process that is white in both

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39

Ni Putu Tiana Verayanti and I. Kadek Nova Arta Kusuma. "SIMULASI NUMERIK MEKANISME TURBULENSI DEKAT AWAN KONVEKTIF." Jurnal Sains & Teknologi Modifikasi Cuaca 22, no. 1 (2021): 25–33. http://dx.doi.org/10.29122/jstmc.v22i1.4560.

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Intisari Turbulensi yang dialami oleh pesawat komersial rute Jakarta-Medan telah dilaporkan mengalami Clear Air Turbulence (CAT) di atas Sumatera Utara pada tanggal 24 Oktober 2017. Namun berdasarkan data citra satelit Himawari dari Badan Meteorologi, Klimatologi, dan Geofisika (BMKG) Indonesia menyebutkan bahwa di sekitar lokasi turbulensi terdapat awan kumulonimbus. Penelitian ini memanfaatkan model WRF-ARW dengan resolusi spasial dan temporal tinggi untuk mengetahui secara detail proses yang terjadi pada awan konvektif penyebab Near Cloud Turbulence (NCT). Turbulensi tersebut disebabkan ole

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40

Lv, Alex, Lile Wang, Renyue Cen, and Luis C. Ho. "Cloud Crushing and Dissipation of Uniformly Driven Adiabatic Turbulence in Circumgalactic Media." Astrophysical Journal 977, no. 2 (2024): 274. https://doi.org/10.3847/1538-4357/ad8f3d.

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Abstract The circumgalactic medium (CGM) is responsive to kinetic disruptions generated by nearby astrophysical events. In this work, we study the saturation and dissipation of turbulent hydrodynamics within the CGM through an extensive array of 252 numerical simulations with proper cooling mechanisms and a large parameter space spanning average gas density, metallicity, and turbulence driving strength. A dichotomy emerges in the dynamics dissipation behaviors upon turbulence driving turnoff. Hot and subsonic disturbances are characterized by weak compression and slow dissipation, while warm a

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41

Germano, M. "Turbulence: the filtering approach." Journal of Fluid Mechanics 238 (May 1992): 325–36. http://dx.doi.org/10.1017/s0022112092001733.

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Explicit or implicit filtered representations of chaotic fields like spectral cut-offs or numerical discretizations are commonly used in the study of turbulence and particularly in the so-called large-eddy simulations. Peculiar to these representations is that they are produced by different filtering operators at different levels of resolution, and they can be hierarchically organized in terms of a characteristic parameter like a grid length or a spectral truncation mode. Unfortunately, in the case of a general implicit or explicit filtering operator the Reynolds rules of the mean are no longe

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42

Kaminski, A. K., and W. D. Smyth. "Stratified shear instability in a field of pre-existing turbulence." Journal of Fluid Mechanics 862 (January 11, 2019): 639–58. http://dx.doi.org/10.1017/jfm.2018.973.

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Turbulent mixing of heat and momentum in the stably-stratified ocean interior occurs in discrete events driven by vertical variations of the horizontal velocity. Typically, these events have been modelled assuming an initially laminar stratified shear flow which develops wavelike instabilities, becomes fully turbulent, and then relaminarizes into a stable state. However, in the real ocean there is always some level of turbulence left over from previous events. Using direct numerical simulations, we show that the evolution of a stably-stratified shear layer may be significantly modified by pre-

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SEO, YONGWON, HAENG SIK KO, and SANGYOUNG SON. "MULTIFRACTAL CHARACTERISTICS OF AXISYMMETRIC JET TURBULENCE INTENSITY FROM RANS NUMERICAL SIMULATION." Fractals 26, no. 01 (2018): 1850008. http://dx.doi.org/10.1142/s0218348x18500081.

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A turbulent jet bears diverse physical characteristics that have been unveiled yet. Of particular interest is to analyze the turbulent intensity, which has been a key factor to assess and determine turbulent jet performance since diffusive and mixing conditions are largely dependent on it. Multifractal measures are useful in terms of identifying characteristics of a physical quantity distributed over a spatial domain. This study examines the multifractal exponents of jet turbulence intensities obtained through numerical simulation. We acquired the turbulence intensities from numerical jet disc

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Barkley, D. "Taming turbulent fronts by bending pipes." Journal of Fluid Mechanics 872 (June 4, 2019): 1–4. http://dx.doi.org/10.1017/jfm.2019.340.

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Abstract (sommario):

The flow of fluid through a pipe has been instrumental in illuminating the subcritical route to turbulence typical of many wall-bounded shear flows. Especially important in this process are the turbulent–laminar fronts that separate the turbulent and laminar flow. Four years ago Michael Graham (Nature, vol. 526, 2015, p. 508) wrote a commentary entitled ‘Turbulence spreads like wildfire’, which is a picturesque but also accurate characterisation of the way turbulence spreads through laminar flow in a straight pipe. In this spirit, the recent article by Rinaldi et al. (J. Fluid Mech., vol. 866,

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45

Le, Thai-Hoa, and Dong-Anh Nguyen. "TEMPORO-SPECTRAL COHERENT STRUCTURE OF TURBULENCE AND PRESSURE USING FOURIER AND WAVELET TRANSFORMS." ASEAN Journal on Science and Technology for Development 25, no. 2 (2017): 405–17. http://dx.doi.org/10.29037/ajstd.271.

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Abstract (sommario):

Studying the spatial distribution in coherent fields such as turbulent and turbulent-induced force ones is important to model and evaluate turbulent-induced forces and response of structures on the turbulent flows. Turbulent field-based coherent function is commonly used for the spatial distribution characteristic of induced forces in the frequency domain. This paper will focus to study spectral coherent structure of turbulence and forces in not only the frequency domain using conventional Fourier transform-based coherence, but also temporo-spectral coherent one in the time-frequency plane tha

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46

Mahmoudi, Mahsa, and Mohammad Ali Banihashemi. "Analytical and numerical investigation of mechanical energy balance and energy loss of three-dimensional steady turbulent flows in open-channels." Journal of Hydrology and Hydromechanics 70, no. 2 (2022): 222–33. http://dx.doi.org/10.2478/johh-2022-0011.

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Abstract (sommario):

Abstract Study about the mechanical energy balance and the energy loss of 3-D turbulent flows in open-channels has its own complexities. The governing equation of the mechanical energy in turbulent flows has been previously known and includes turbulence parameters that their calculations or measurements are not easy. In this study, a form of the total mechanical energy equation that leads to a number of significant physical insights is analytically investigated, from which analytical relationships for the energy loss estimation in 3-D turbulent flows are defined. The effect of different turbul

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47

Ruan, W., L. Yan, and R. Keppens. "Magnetohydrodynamic Turbulence Formation in Solar Flares: 3D Simulation and Synthetic Observations." Astrophysical Journal 947, no. 2 (2023): 67. http://dx.doi.org/10.3847/1538-4357/ac9b4e.

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Abstract Turbulent plasma motion is common in the universe and invoked in solar flares to drive effective acceleration leading to high-energy electrons. Unresolved mass motions are frequently detected in flares from extreme ultraviolet (EUV) observations, which are often regarded as turbulence. However, how this plasma turbulence forms during the flare is still largely a mystery. Here we successfully reproduce observed turbulence in our 3D magnetohydrodynamic simulation where the magnetic reconnection process is included. The turbulence forms as a result of an intricate nonlinear interaction b

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48

Madaliev, Murodil, Zokhidjon Abdulkhaev, Jamshidbek Otajonov, et al. "Comparison of numerical results of turbulence models for the problem of heat transfer in turbulent molasses." E3S Web of Conferences 508 (2024): 05007. http://dx.doi.org/10.1051/e3sconf/202450805007.

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The study introduces Malikov's two-fluid methodology along with the RSM turbulence model for simulating turbulent heat transfer phenomena. It elucidates that temperature fluctuations within turbulent flows arise from temperature differentials between the respective fluids. Leveraging the two-fluid paradigm, the researchers develop a mathematical framework to characterize turbulent heat transfer dynamics. This resultant turbulence model is then applied to analyze heat propagation in turbulent flows around a flat plate and in scenarios involving submerged jets. To validate the model's efficacy,

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49

Guerra, Maricarmen, and Jim Thomson. "Turbulence Measurements from Five-Beam Acoustic Doppler Current Profilers." Journal of Atmospheric and Oceanic Technology 34, no. 6 (2017): 1267–84. http://dx.doi.org/10.1175/jtech-d-16-0148.1.

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AbstractTwo new five-beam acoustic Doppler current profilers—the Nortek Signature1000 AD2CP and the Teledyne RDI Sentinel V50—are demonstrated to measure turbulence at two energetic tidal channels within Puget Sound, Washington. The quality of the raw data is tested by analyzing the turbulent kinetic energy frequency spectra, the turbulence spatial structure function, the shear in the profiles, and the covariance Reynolds stresses. The five-beam configuration allows for a direct estimation of the Reynolds stresses from along-beam velocity fluctuations. The Nortek’s low Doppler noise and high s

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50

Čantrak, Đorđe S., and Novica Z. Janković. "High speed stereoscopic PIV investigation of the statistical characteristics of the axially restricted turbulent swirl flow behind the axial fan in pipe." Advances in Mechanical Engineering 14, no. 11 (2022): 168781322211305. http://dx.doi.org/10.1177/16878132221130563.

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Abstract (sommario):

Investigation of the turbulent swirl flow in the piping system is one of the most complex investigations in the field of energetics and turbulence. Axial fans in a pipe, without guide vanes, are widely used in practice and the problem of their duty point and energy efficiency is still extensively discussed. Analysis of the interaction between axial fans energy and construction parameters is one of the main topics in defining the fans energy efficiency potential. On one side, there is a three-dimensional velocity field in the wall-bounded flow with regions of great turbulence intensity. On the

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