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Journal articles on the topic 'Anisotropic turbulence models'

Author: Grafiati

Published: 7 July 2024

Last updated: 31 July 2025

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1

Nazarov, F. Kh. "Comparing Turbulence Models for Swirling Flows." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 2 (95) (April 2021): 25–36. http://dx.doi.org/10.18698/1812-3368-2021-2-25-36.

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The paper considers a turbulent fluid flow in a rotating pipe, known as the Taylor --- Couette --- Poiseuille flow. Linear RANS models are not suitable for simulating this type of problems, since the turbulence in these flows is strongly anisotropic, which means that solving these problems requires models accounting for turbulence anisotropy. Modified linear models featuring corrections for flow rotations, such as the SARC model, make it possible to obtain satisfactory solutions. A new approach to turbulence problems has appeared recently. It allowed a novel two-fluid turbulence model to be cr

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2

CUI, G. X., C. X. XU, L. FANG, L. SHAO, and Z. S. ZHANG. "A new subgrid eddy-viscosity model for large-eddy simulation of anisotropic turbulence." Journal of Fluid Mechanics 582 (June 14, 2007): 377–97. http://dx.doi.org/10.1017/s002211200700599x.

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A new subgrid eddy-viscosity model is proposed in this paper. Full details of the derivation of the model are given with the assumption of homogeneous turbulence. The formulation of the model is based on the dynamic equation of the structure function of resolved scale turbulence. By means of the local volume average, the effect of the anisotropy is taken into account in the generalized Kolmogorov equation, which represents the equilibrium energy transfer in the inertial subrange. Since the proposed model is formulated directly from the filtered Navier–Stokes equation, the resulting subgrid edd

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3

Barbi, G., A. Chierici, V. Giovacchini, F. Quarta, and S. Manservisi. "Numerical simulation of a low Prandtl number flow over a backward facing step with an anisotropic four-equation turbulence model." Journal of Physics: Conference Series 2177, no. 1 (2022): 012006. http://dx.doi.org/10.1088/1742-6596/2177/1/012006.

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Abstract In recent years the use of liquid metals has become more and more popular for heat transfer applications in many fields ranging from IV generation fast nuclear reactors to solar power plants. Due to their low Prandtl number values, the similarity between dynamical and thermal fields cannot be assumed and sophisticated heat turbulence models are required to take into account the anisotropy of the turbulent heat transfer involving liquid metals. In the present work, we solve an anisotropic four-equation turbulence model coupled with the Reynolds Averaged Navier Stokes system of equation

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4

Chang, Ning, Zelong Yuan, Yunpeng Wang, and Jianchun Wang. "The effect of filter anisotropy on the large eddy simulation of turbulence." Physics of Fluids 35, no. 3 (2023): 035134. http://dx.doi.org/10.1063/5.0142643.

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We study the effect of filter anisotropy and sub-filter scale (SFS) dynamics on the accuracy of large eddy simulation (LES) of turbulence, by using several types of SFS models including the dynamic Smagorinsky model (DSM), dynamic mixed model (DMM), and the direct deconvolution model (DDM) with the anisotropic filter. The aspect ratios (AR) of the filters for LES range from 1 to 16. We show that the DDM is capable of predicting SFS stresses accurately at highly anisotropic filter. In the a priori study, the correlation coefficients of SFS stress reconstructed by the DDM are over 90%, which are

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5

Adduci Faria, S., R. Santos-Lima, and E. M. de Gouveia Dal Pino. "Effective Viscosity in the Intracluster Medium During Magnetic Field Amplification via Turbulent Dynamo." Astrophysical Journal 988, no. 1 (2025): 34. https://doi.org/10.3847/1538-4357/addc5f.

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Abstract Galaxy clusters, the largest gravitationally bound structures, host a hot, diffuse plasma with poorly understood viscosity and magnetic field amplification. Astrophysical plasmas are often modeled with magnetohydrodynamics (MHD), but low collision rates in environments such as the intracluster medium (ICM) hinder thermodynamic equilibrium, causing pressure anisotropies and high viscosity. High-β plasmas, dominated by thermal pressure, are prone to instabilities (e.g., firehose or mirror) that limit anisotropy, reduce viscosity, and enable small-scale dynamo-driven magnetic amplificati

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Faragó, Dávid, and Péter Bencs. "Measurement of turbulence properties." Analecta Technica Szegedinensia 14, no. 1 (2020): 67–75. http://dx.doi.org/10.14232/analecta.2020.1.67-75.

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The aim of the research is to investigate anisotropic turbulence intensities, id est to investigate the distribution of Reynolds stresses and energy spectra in a square cross-section channel, downstream of a semi-active jet turbulence grid generating anisotropic turbulent airflow. In addition to the semi-active jet turbulence grid, another type of turbulence grid was developed and experimentally investigated. This grid contains vertical, flexible strips of aluminum (in this case, there are no perpendicular (horizontal) grid elements), which vibrate at a frequency depending on the velocity of t

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7

DEN TOONDER, J. M. J., M. A. HULSEN, G. D. C. KUIKEN, and F. T. M. NIEUWSTADT. "Drag reduction by polymer additives in a turbulent pipe flow: numerical and laboratory experiments." Journal of Fluid Mechanics 337 (April 25, 1997): 193–231. http://dx.doi.org/10.1017/s0022112097004850.

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In order to study the roles of stress anisotropy and of elasticity in the mechanism of drag reduction by polymer additives we investigate a turbulent pipe flow of a dilute polymer solution. The investigation is carried out by means of direct numerical simulation (DNS) and laser Doppler velocimetry (LDV). In our DNS two different models are used to describe the effects of polymers on the flow. The first is a constitutive equation based on Batchelor's theory of elongated particles suspended in a Newtonian solvent which models the viscous anisotropic effects caused by the polymer orientation. The

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8

Cui, Linyan. "Atmosphere turbulence MTF models in moderate-to-strong anisotropic turbulence." Optik 130 (February 2017): 68–75. http://dx.doi.org/10.1016/j.ijleo.2016.11.012.

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9

Cambon, Claude, and Julian F. Scott. "LINEAR AND NONLINEAR MODELS OF ANISOTROPIC TURBULENCE." Annual Review of Fluid Mechanics 31, no. 1 (1999): 1–53. http://dx.doi.org/10.1146/annurev.fluid.31.1.1.

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10

Hocking, W. K., and J. Röttger. "The structure of turbulence in the middle and lower atmosphere seen by and deduced from MF, HF and VHF radar, with special emphasis on small-scale features and anisotropy." Annales Geophysicae 19, no. 8 (2001): 933–44. http://dx.doi.org/10.5194/angeo-19-933-2001.

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Abstract. An overview of the turbulent structures seen by MF, HF and VHF radars in the troposphere, stratosphere and mesosphere is presented, drawing on evidence from previous radar measurements, in situ studies, laboratory observations, observations at frequencies other than those under focus, and modelling studies. We are particularly interested in structures at scales less than one radar pulse length, and smaller than the beam width, and especially the degree of anisotropy of turbulence at these scales. Previous radar observations are especially important in regard to the degree of anisotro

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11

Myong, Hyon Kook, та Toshio Kobayashi. "Prediction of Three-Dimensional Developing Turbulent Flow in a Square Duct With an Anisotropic Low-Reynolds-Number k-ε Model". Journal of Fluids Engineering 113, № 4 (1991): 608–15. http://dx.doi.org/10.1115/1.2926523.

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Three-dimensional developing turbulent flow in a square duct involving turbulence-driven secondary motion is numerically predicted with an anisotropic low-Reynolds-number k-ε turbulence model. Special attention has been given to both regions close to the wall and the corner, which are known to influence the characteristics of secondary flow a great deal. Hence, the no-slip boundary condition at the wall is directly used in place of the common wall function approach. The resulting set of equations simplified only by the boundary layer assumption are first compared with previous algebraic stress

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12

Majda, A. J., and M. J. Grote. "Mathematical test models for superparametrization in anisotropic turbulence." Proceedings of the National Academy of Sciences 106, no. 14 (2009): 5470–74. http://dx.doi.org/10.1073/pnas.0901383106.

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13

Briggs, D. A., J. H. Ferziger, J. R. Koseff, and S. G. Monismith. "Entrainment in a shear-free turbulent mixing layer." Journal of Fluid Mechanics 310 (March 10, 1996): 215–41. http://dx.doi.org/10.1017/s0022112096001784.

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Results from a direct numerical simulation of a shear-free turbulent mixing layer are presented. The mixing mechanisms associated with the turbulence are isolated. In the first set of simulations, the turbulent mixing layer decays as energy is exchanged between the layers. Energy spectra with E(k) ∼ k2 and E(k) ∼ k4 dependence at low wavenumber are used to initialize the flow to investigate the effect of initial conditions. The intermittency of the mixing layer is quantified by the skewness and kurtosis of the velocity fields: results compare well with the shearless mixing layer experiments of

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14

Wall, Dylan, and Eric Paterson. "Anisotropic RANS Turbulence Modeling for Wakes in an Active Ocean Environment." Fluids 5, no. 4 (2020): 248. http://dx.doi.org/10.3390/fluids5040248.

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The problem of simulating wakes in a stratified oceanic environment with active background turbulence is considered. Anisotropic RANS turbulence models are tested against laboratory and eddy-resolving models of the problem. An important aspect of our work is to acknowledge that the environment is not quiescent; therefore, additional sources are included in the models to provide a non-zero background turbulence. The RANS models are found to reproduce some key features from the eddy-resolving and laboratory descriptions of the problem. Tests using the freestream sources show the intuitive result

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15

Li, Yunxiao, Zhao Zhang, Ruyi Li, et al. "The Spiral Spectrum of a Laguerre–Gaussian Beam Carrying the Cross-Phase Propagating in Weak-to-Strong Atmospheric Turbulence." Photonics 11, no. 2 (2024): 148. http://dx.doi.org/10.3390/photonics11020148.

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In communication links, the presence of atmospheric turbulence leads to crosstalk between the orbital angular momentum (OAM) states, thereby limiting the performance of information transmission. Thus, knowledge of the effect of turbulence on the spiral spectrum (also named the OAM spectrum) is of utmost importance in the field of optical communications. However, most of the existing studies are limited to weak turbulence calculation models. In this paper, based on the extended Huygens–Fresnel integral, the analytical expression is derived for the mutual coherence function of a Laguerre–Gaussia

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16

Benoumessad, Kamel, Fatima Zohra Fourar, Ali Fourar, and Fawaz Massouh. "Modeling Turbulent Flow Velocity Profiles in Irregularly shaped Open Channels: A 3D Approach." Engineering, Technology & Applied Science Research 15, no. 2 (2025): 22203–8. https://doi.org/10.48084/etasr.9251.

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Numerically simulating turbulent open-channel flows represents a formidable challenge in Computational Fluid Dynamics (CFD), particularly when addressing the interplay of transient turbulence, irregular bathymetry, and dynamic free-surface interactions inherent to natural river systems. This study advances a three-dimensional nonlinear (k-ε) turbulence model to resolve flow dynamics, velocity distributions, and mass transport mechanisms in both meandering and straight open channels. The framework leverages cylindrical coordinate systems to accommodate curvilinear geometries, enabling precise r

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17

Yushkov, E. V., R. Allahverdiyev, and D. D. Sokoloff. "Mean-Field Dynamo Model in Anisotropic Uniform Turbulent Flow with Short-Time Correlations." Galaxies 8, no. 3 (2020): 68. http://dx.doi.org/10.3390/galaxies8030068.

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The mean-field model is one of the basic models of the dynamo theory, which describes the magnetic field generation in a turbulent astrophysical plasma. The first mean-field equations were obtained by Steenbeck, Krause and Rädler for two-scale turbulence under isotropy and uniformity assumptions. In this article we develop the path integral approach to obtain mean-field equations for a short-correlated random velocity field in anisotropic streams. By this model we analyse effects of anisotropy and show the relation between dynamo growth and anisotropic tensors of helicity/turbulent diffusivity

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18

Mathis, S., V. Prat, L. Amard, et al. "Anisotropic turbulent transport in stably stratified rotating stellar radiation zones." Astronomy & Astrophysics 620 (November 23, 2018): A22. http://dx.doi.org/10.1051/0004-6361/201629187.

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Context. Rotation is one of the key physical mechanisms that deeply impact the evolution of stars. Helio- and asteroseismology reveal a strong extraction of angular momentum from stellar radiation zones over the whole Hertzsprung–Russell diagram. Aims. Turbulent transport in differentially rotating, stably stratified stellar radiation zones should be carefully modelled and its strength evaluated. Stratification and rotation imply that this turbulent transport is anisotropic. So far only phenomenological prescriptions have been proposed for the transport in the horizontal direction. This, howev

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19

Kaltenbach, H. J., T. Gerz, and U. Schumann. "Large-eddy simulation of homogeneous turbulence and diffusion in stably stratified shear flow." Journal of Fluid Mechanics 280 (December 10, 1994): 1–40. http://dx.doi.org/10.1017/s0022112094002831.

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By means of large-eddy simulation, homogeneous turbulence is simulated for neutrally and stably stratified shear flow at gradient-Richardson numbers between zero and one. We investigate the turbulent transport of three passive species which have uniform gradients in either the vertical, downstream or cross-stream direction. The results are compared with previous measurements in the laboratory and in the stable atmospheric boundary layer, as well as with results from direct numerical simulations. The computed and measured flow properties agree with each other generally within the scatter of the

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20

Fraschetti, F. "Cross-field transport and pitch-angle anisotropy of solar energetic particles in MHD turbulence." ASTRA Proceedings 2 (January 15, 2016): 63–65. http://dx.doi.org/10.5194/ap-2-63-2016.

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Abstract. Recent modelling of solar energetic particles (SEPs) propagation through the heliospheric turbulence, also discussed in this workshop, has investigated the role of the pitch-angle scattering and the perpendicular transport in spreading particles in heliolongitude, as shown by multi-spacecraft measurements (STEREO A/B, ACE, SOHO, etc.) at 1 AU in various energy ranges. In some events the first-order pitch-angle anisotropy of the particles distribution is not-negligible. We calculate the average perpendicular displacement due to the gradient/curvature drift in an inhomogeneous turbulen

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21

Slama, Myriam, Cédric Leblond, and Pierre Sagaut. "A Kriging-based elliptic extended anisotropic model for the turbulent boundary layer wall pressure spectrum." Journal of Fluid Mechanics 840 (February 6, 2018): 25–55. http://dx.doi.org/10.1017/jfm.2017.810.

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The present study addresses the computation of the wall pressure spectrum for a turbulent boundary layer flow without pressure gradient, at high Reynolds numbers, using a new model, the Kriging-based elliptic extended anisotropic model (KEEAM). A space–time solution to the Poisson equation for the wall pressure fluctuations is used. Both the turbulence–turbulence and turbulence–mean shear interactions are taken into account. It involves the mean velocity field and space–time velocity correlations which are modelled using Reynolds stresses and velocity correlation coefficients. We propose a new

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22

Barbi, Giacomo, Valentina Giovacchini, and Sandro Manservisi. "A New Anisotropic Four-Parameter Turbulence Model for Low Prandtl Number Fluids." Fluids 7, no. 1 (2021): 6. http://dx.doi.org/10.3390/fluids7010006.

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Due to their interesting thermal properties, liquid metals are widely studied for heat transfer applications where large heat fluxes occur. In the framework of the Reynolds-Averaged Navier–Stokes (RANS) approach, the Simple Gradient Diffusion Hypothesis (SGDH) and the Reynolds Analogy are almost universally invoked for the closure of the turbulent heat flux. Even though these assumptions can represent a reasonable compromise in a wide range of applications, they are not reliable when considering low Prandtl number fluids and/or buoyant flows. More advanced closure models for the turbulent heat

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23

Djeddou, Mokhtar, Amine Mehel, Georges Fokoua, Anne Tanière, and Patrick Chevrier. "On the application of statistical turbulence models to the simulation of airflow inside a car cabin." Physics of Fluids 35, no. 2 (2023): 025106. http://dx.doi.org/10.1063/5.0132677.

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Computational fluid dynamics simulations of airflow inside a full-scale passenger car cabin are performed using the Reynolds averaged Navier–Stokes equations. The performance of a range of turbulence models is examined by reference to experimental results of the streamwise mean velocity and turbulence intensity profiles, obtained using the hot-wire anemometry technique at different locations inside the car cabin. The models include three linear eddy-viscosity-based variants, namely, the realizable k– ε, the renormalization group k– ε, and the shear-stress transport k– ω models. The baseline Re

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Milne, I. A., R. N. Sharma, and R. G. J. Flay. "The structure of turbulence in a rapid tidal flow." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 473, no. 2204 (2017): 20170295. http://dx.doi.org/10.1098/rspa.2017.0295.

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The structure of turbulence in a rapid tidal flow is characterized through new observations of fundamental statistical properties at a site in the UK which has a simple geometry and sedate surface wave action. The mean flow at the Sound of Islay exceeded 2.5 m s −1 and the turbulent boundary layer occupied the majority of the water column, with an approximately logarithmic mean velocity profile identifiable close to the seabed. The anisotropic ratios, spectral scales and higher-order statistics of the turbulence generally agree well with values reported for two-dimensional open channels in the

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Маликов, Зафар Маматкулович, та Дилшод Примкулович Наврузов. "Моделирование турбулентной естественной конвекции на основе 2-жидкостного подхода". Computational Continuum Mechanics 17, № 1 (2024): 111–18. http://dx.doi.org/10.7242/1999-6691/2024.17.1.10.

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The paper provides mathematical modeling of turbulent natural air convection at a heated vertical plate based on a fairly recently developed two-liquid turbulence model. The considered problem, despite its relative simplicity, contains all the main elements characteristic of the currents near the wall due to buoyancy forces. A significant disadvantage of the RANS turbulence models used to solve such problems is that for their numerical implementation it is necessary to set the laminar-to-turbulent transition point, which must be determined experimentally. Thus, all RANS models are unable to de

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Khani, Sina, and Michael L. Waite. "An Anisotropic Subgrid-Scale Parameterization for Large-Eddy Simulations of Stratified Turbulence." Monthly Weather Review 148, no. 10 (2020): 4299–311. http://dx.doi.org/10.1175/mwr-d-19-0351.1.

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AbstractSubgrid-scale (SGS) parameterizations in atmosphere and ocean models are often defined independently in the horizontal and vertical directions because the grid spacing is not the same in these directions (anisotropic grids). In this paper, we introduce a new anisotropic SGS model in large-eddy simulations (LES) of stratified turbulence based on horizontal filtering of the equations of motion. Unlike the common horizontal SGS parameterizations in atmosphere and ocean models, the vertical derivatives of the horizontal SGS fluxes are included in our anisotropic SGS scheme, and therefore t

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Kolesnichenko, Aleksandr Vladimirovich. "Toward a theory of spiral turbulence of a nonmagnetic astrophysical disk. Formation of large-scale vortex structures." Keldysh Institute Preprints, no. 9 (2024): 1–56. http://dx.doi.org/10.20948/prepr-2024-9.

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A closed system of three-dimensional hydrodynamic equations of the mean motion scale is presented for modeling spiral turbulence in a rotating astrophysical disk. The diffusion equations for the averaged vortex and the integral vortex spirality transport equation are derived. A general concept of the emergence of energy-consuming mezoscale coherent vortex structures in a thermodynamically open subsystem of turbulent chaos, associated with the realization of the inverse cascade of kine-tic energy in mirror-nonsymmetric disk turbulence, is formulated. It is shown that negative viscosity in the r

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28

Zhai, Chao. "Performance of rectangular QAM/FSO communication systems in the anisotropic non-Kolmogorov ground-to-satellite uplink." Journal of Optical Communications and Networking 14, no. 9 (2022): 713. http://dx.doi.org/10.1364/jocn.456657.

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Quadrature amplitude modulation (QAM) is an exciting technology to accomplish a high communication data rate without increasing the system bandwidth, which can undoubtedly greatly improve the performance of free-space optical (FSO) communication systems. With the increase of experimental and theoretical results about atmospheric turbulence, scientists have confirmed that the anisotropy and non-Kolmogorov property cannot be ignored for atmospheric turbulence. In this paper, utilizing the new anisotropic non-Kolmogorov (ANK) turbulence spectrum models for the satellite links that are applicable

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29

Wang, C., S. P. Oh, and M. Ruszkowski. "Turbulent heating in a stratified medium." Monthly Notices of the Royal Astronomical Society 519, no. 3 (2023): 4408–23. http://dx.doi.org/10.1093/mnras/stad003.

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ABSTRACT There is considerable evidence for widespread subsonic turbulence in galaxy clusters, most notably from Hitomi. Turbulence is often invoked to offset radiative losses in cluster cores, both by direct dissipation and by enabling turbulent heat diffusion. However, in a stratified medium, buoyancy forces oppose radial motions, making turbulence anisotropic. This can be quantified via the Froude number Fr, which decreases inward in clusters as stratification increases. We exploit analogies with MHD turbulence to show that wave–turbulence interactions increase cascade times and reduce diss

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Li, Xueying, Jing Ren, and Hongde Jiang. "Application of algebraic anisotropic turbulence models to film cooling flows." International Journal of Heat and Mass Transfer 91 (December 2015): 7–17. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.07.098.

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Syed, Abdul Haseeb, and Jakob Mann. "Simulating low-frequency wind fluctuations." Wind Energy Science 9, no. 6 (2024): 1381–91. http://dx.doi.org/10.5194/wes-9-1381-2024.

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Abstract. Large-scale flow structures are vital in influencing the dynamic response of floating wind turbines and wake meandering behind large offshore wind turbines. It is imperative that we develop an inflow wind turbulence model capable of replicating the large-scale and low-frequency wind fluctuations occurring in the marine atmosphere since the current turbulence models do not account well for this phenomenon. Here, we present a method to simulate low-frequency wind fluctuations. This method employs the two-dimensional (2D) spectral tensor for low-frequency, anisotropic wind fluctuations

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Mann, Jakob, and Abdul Haseeb Syed. "Simulating low-frequency wind fluctuations." Wind Energy Science 9, no. 6 (2024): 1381–91. https://doi.org/10.5194/wes-9-1381-2024.

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Large-scale flow structures are vital in influencing the dynamic response of floating wind turbines and wake meandering behind large offshore wind turbines. It is imperative that we develop an inflow wind turbulence model capable of replicating the large-scale and low-frequency wind fluctuations occurring in the marine atmosphere since the current turbulence models do not account well for this phenomenon. Here, we present a method to simulate low-frequency wind fluctuations. This method employs the two-dimensional (2D) spectral tensor for low-frequency, anisotropic win

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Im, Yong H., Kang Y. Huh, and Kwang-Yong Kim. "Analysis of Impinging and Countercurrent Stagnating Flows by Reynolds Stress Model." Journal of Fluids Engineering 124, no. 3 (2002): 706–18. http://dx.doi.org/10.1115/1.1493815.

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Numerical simulation is performed for stagnating turbulent flows of impinging and countercurrent jets by the Reynolds stress model (RSM). Results are compared with those of the k−ε model and available data to assess the flow characteristics and turbulence models. Three variants of the RSM tested are those of Gibson and Launder (GL), Craft and Launder (GL-CL) and Speziale, Sarkar and Gatski (SSG). As is well known, the k−ε model significantly overestimates turbulent kinetic energy near the wall. Although the RSM is superior to the k−ε model, it shows considerable difference according to how the

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Zahiri, Amir-Pouyan, and Ehsan Roohi. "Assessment of anisotropic minimum-dissipation (AMD) subgrid-scale model: Gently-curved backward-facing step flow." International Journal of Modern Physics C 32, no. 05 (2021): 2150068. http://dx.doi.org/10.1142/s0129183121500686.

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The impetus of this study is to evaluate the performance of the anisotropic minimum-dissipation (AMD) subgrid-scale model (SGS) for flow over a gently-curved backward-facing step (BFS) at a Reynolds number of 13 700. Minimum-dissipation sub-grid models were developed as simple alternatives to the dynamic eddy-viscosity SGS models. AMD model is a static type of eddy-viscosity SGS model incorporating anisotropic SGS effects into numerical predictions through the large-eddy simulation (LES) approach. The open-source CFD package of OpenFOAM was used to implement the AMD model. Before focusing on t

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Brearley, Peter, Umair Ahmed, Nilanjan Chakraborty, and Markus Klein. "Scaling of Second-Order Structure Functions in Turbulent Premixed Flames in the Flamelet Combustion Regime." Fluids 5, no. 2 (2020): 89. http://dx.doi.org/10.3390/fluids5020089.

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The second-order velocity structure function statistics have been analysed using a DNS database of statistically planar turbulent premixed flames subjected to unburned gas forcing. The flames considered here represent combustion for moderate values of Karlovitz number from the wrinkled flamelets to the thin reaction zones regimes of turbulent premixed combustion. It has been found that the second-order structure functions exhibit the theoretical asymptotic scalings in the dissipative and (relatively short) inertial ranges. However, the constant of proportionality for the theoretical asymptotic

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Kholboev, B. M., D. P. Navruzov, D. S. Asrakulova, N. R. Engalicheva, and A. A. Turemuratova. "Comparison of the Results for Calculation of Vortex Currents After Sudden Expansion of the Pipe with Different Diameters." International Journal of Applied Mechanics and Engineering 27, no. 2 (2022): 115–23. http://dx.doi.org/10.2478/ijame-2022-0023.

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Abstract In this work, a numerical study of a sharply expanding highly swirling flow is carried out using v2-f models based on the Comsol Multiphysics 5.6 software package and a two-fluid turbulence model. The results obtained are compared with known experimental data with different pipe diameters. The purpose of this work is to test the ability of models to describe anisotropic turbulence. It is shown that the two-fluid model is more suitable for studying such flows.

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Barbi, G., A. Chierici, L. Chirco, V. Giovacchini, S. Manservisi, and L. Sirotti. "Numerical simulation of a low Prandtl number flow with a four-parameters turbulence model through an explicit algebraic definition of Reynolds stress and turbulent heat flux." Journal of Physics: Conference Series 2177, no. 1 (2022): 012005. http://dx.doi.org/10.1088/1742-6596/2177/1/012005.

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Abstract Computational Fluid Dynamics codes usually adopt the Reynolds analogy in order to simulate dynamic and thermal flow fields for ordinary fluids like water and air. On the other hand, in low Prandtl fluids, such as heavy liquid metals like Lead-Bismuth Eutectic (LBE), the time scales of temperature and velocity fields are rather different and therefore similarity hypothesis cannot be used. Furthermore, to properly predict a complex flow field characterized by anisotropic behavior, it is necessary to overcome eddy-viscosity models and move to more advanced turbulence models. In the prese

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Bian, N. H., and Gang Li. "Lagrangian Perspectives on the Small-scale Structure of Alfvénic Turbulence and Stochastic Models for the Dispersion of Fluid Particles and Magnetic Field Lines in the Solar Wind." Astrophysical Journal Supplement Series 273, no. 1 (2024): 15. http://dx.doi.org/10.3847/1538-4365/ad4a5c.

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Abstract Lagrangian perspectives on the small-scale structure of anisotropic Alfvénic turbulence are adopted. We are interested in relating the statistical properties of the Eulerian field increments evaluated along the fluid particle trajectories, in the direction perpendicular to the guiding magnetic field and along the magnetic field lines. We establish the basis for a unified multifractal phenomenology of Eulerian and Lagrangian Alfvénic turbulence. The critical balance condition is generalized to structure functions of an order different than 2. A Lagrangian perspective is not only useful

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van den Berg, J. P., N. E. Engelbrecht, N. Wijsen, and R. D. Strauss. "On the Turbulent Reduction of Drifts for Solar Energetic Particles." Astrophysical Journal 922, no. 2 (2021): 200. http://dx.doi.org/10.3847/1538-4357/ac2736.

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Abstract Particle drifts perpendicular to the background magnetic field have been proposed by some authors as an explanation for the very efficient perpendicular transport of solar energetic particles (SEPs). This process, however, competes with perpendicular diffusion caused by magnetic turbulence, which can also disrupt the drift patterns and reduce the magnitude of drift effects. The latter phenomenon is well known in cosmic-ray studies, but not yet considered in SEP models. Additionally, SEP models that do not include drifts, especially for electrons, use turbulent drift reduction as a jus

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Chernyshov, A. A., K. V. Karelsky, and A. S. Petrosyan. "Large eddy simulations in plasma astrophysics. Weakly compressible turbulence in local interstellar medium." Proceedings of the International Astronomical Union 6, S274 (2010): 80–84. http://dx.doi.org/10.1017/s1743921311006612.

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AbstractWe apply large eddy simulation technique to carry out three-dimensional numerical simulation of compressible magnetohydrodynamic turbulence in conditions relevant local interstellar medium. According to large eddy simulation method, the large-scale part of the flow is computed directly and only small-scale structures of turbulence are modeled. The small-scale motion is eliminated from the initial system of equations of motion by filtering procedures and their effect is taken into account by special closures referred to as the subgrid-scale models. Establishment of weakly compressible l

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Pinarbasi, A., and M. W. Johnson. "Detailed Stress Tensor Measurements in a Centrifugal Compressor Vaneless Diffuser." Journal of Turbomachinery 118, no. 2 (1996): 394–99. http://dx.doi.org/10.1115/1.2836654.

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Detailed flow measurements have been made in the vaneless diffuser of a large low-speed centrifugal compressor using hot-wire anemometry. The three time mean velocity components and full stress tensor distributions have been determined on eight measurement planes within the diffuser. High levels of Reynolds stress result in the rapid mixing out of the blade wake. Although high levels of turbulent kinetic energy are found in the passage wake, they are not associated with strong Reynolds stresses and hence the passage wake mixes out only slowly. Low-frequency meandering of the wake position is t

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Beattie, James R., Christoph Federrath, and Amit Seta. "Magnetic field fluctuations in anisotropic, supersonic turbulence." Monthly Notices of the Royal Astronomical Society 498, no. 2 (2020): 1593–608. http://dx.doi.org/10.1093/mnras/staa2257.

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ABSTRACT The rich structure that we observe in molecular clouds is due to the interplay between strong magnetic fields and supersonic (turbulent) velocity fluctuations. The velocity fluctuations interact with the magnetic field, causing it too to fluctuate. Using numerical simulations, we explore the nature of such magnetic field fluctuations, $\delta \mathrm{{\boldsymbol {\mathit {B}}}}$, over a wide range of turbulent Mach numbers, $\operatorname{\mathcal {M}}= 2\!-\!20$ (i.e. from weak to strong compressibility), and Alfvén Mach numbers, $\operatorname{\mathcal {M}_{\text{A0}}}= 0.1\!-\!100

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Abdulkhaev, Zokhidjon. "Mathematical Modeling of Swirling Jet Streams with Varying Degrees of Swirling." Journal of Construction and Engineering Technology 2, no. 2 (2024): 8–12. https://doi.org/10.5281/zenodo.13893432.

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In this article, a swirling jet is studied on the basis of a two-fluid turbulence model. This task, despite its simplicity, is quite a difficult problem for many turbulence models. This model is derived based on the dynamics of two-liquids. These papers also show that the developed two-fluid model is able to adequately describe complex anisotropic turbulence. It is shown that the results of the two-fluid model, despite the use of a rather coarse computational grid, are in satisfactory<strong>.</strong>

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Jones, Raymond M., Albert D. Harvey, and Sumanta Acharya. "Two-Equation Turbulence Modeling for Impeller Stirred Tanks." Journal of Fluids Engineering 123, no. 3 (2001): 640–48. http://dx.doi.org/10.1115/1.1384568.

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In this study, the predictive performance of six different two-equation turbulence models on the flow in an unbaffled stirred tank has been investigated. These models include the low Reynolds number k-ε model of Rodi, W., and Mansour, N. N., “Low Reynolds Number k-ε Modeling With the Aid of Direct Simulation Data,” J. Fluid Mech., Vol. 250, pp. 509–529, the high and low Reynolds number k-ω models of Wilson, D. C., 1993, Turbulence Modeling for CFD, DCW Industries, La Canada, CA., the RNG k-ε model, and modified k-ω and k-ε models which incorporate a correction for streamline curvature and swir

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Salunkhe, Sanchit, Oumnia El Fajri, Shanti Bhushan, et al. "Validation of Tidal Stream Turbine Wake Predictions and Analysis of Wake Recovery Mechanism." Journal of Marine Science and Engineering 7, no. 10 (2019): 362. http://dx.doi.org/10.3390/jmse7100362.

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This paper documents the predictive capability of rotating blade-resolved unsteady Reynolds averaged Navier-Stokes (URANS) and Improved Delayed Detached Eddy Simulation (IDDES) computations for tidal stream turbine performance and intermediate wake characteristics. Ansys/Fluent and OpenFOAM simulations are performed using mixed-cell, unstructured grids consisting of up to 11 million cells. The thrust, power and intermediate wake predictions compare reasonably well within 10% of the experimental data. For the wake predictions, OpenFOAM performs better than Ansys/Fluent, and IDDES better than UR

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SHEN, LIAN, and DICK K. P. YUE. "Large-eddy simulation of free-surface turbulence." Journal of Fluid Mechanics 440 (August 10, 2001): 75–116. http://dx.doi.org/10.1017/s0022112001004669.

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In this paper we investigate the large-eddy simulation (LES) of the interaction between a turbulent shear flow and a free surface at low Froude numbers. The benchmark flow field is first solved by using direct numerical simulations (DNS) of the Navier–Stokes equations at fine (1282 × 192 grid) resolution, while the LES is performed at coarse resolution. Analysis of the ensemble of 25 DNS datasets shows that the amount of energy transferred from the grid scales to the subgrid scales (SGS) reduces significantly as the free surface is approached. This is a result of energy backscatter associated

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Du, Guang Yu, Zhen Tan, Wei An, and De Сhun Ba. "Research on Numerical Simulation Method for 3D Complex Flow in Rotating Machinery." Applied Mechanics and Materials 226-228 (November 2012): 52–55. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.52.

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A numerical simulation method with gas-structure interaction to analyze 3D complex flow in rotating machinery was presented and the effects with different aerodynamic turbulence model for gas-structure interaction was also presented. The blades are an important component in rotating machinery. Gas flow is unsteady three-dimensional turbulence motion with transient and anisotropic. Then the gas flow and the vibration of rotating blades interfere with each other, resulting in a complex coupling effect. It affects the machine efficiency directly. For discussing the effects on flow field of the co

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Hwang, C. C., Genxing Zhu, M. Massoudi та J. M. Ekmann. "A Comparison of the Linear and Nonlinear k–ε Turbulence Models in Combustors". Journal of Fluids Engineering 115, № 1 (1993): 93–102. http://dx.doi.org/10.1115/1.2910119.

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In swirling turbulent flows, the structure of turbulence is nonhomogeneous and anisotropic and it has been observed that the assumptions leading to the formulation of the k-ε model, which is used very often in many engineering applications, are inadequate for highly swirling flows. Furthermore, even with the various modifications made to the k-ε model, it is still not capable of describing secondary flows in noncircular ducts and it cannot predict non-zero normal-Reynolds-stress differences. Recently Speziale (1987) has developed a nonlinar k-ε model, which extends the range of validity of the

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Van Fossen, G. J., R. J. Simoneau, and C. Y. Ching. "Influence of Turbulence Parameters, Reynolds Number, and Body Shape on Stagnation-Region Heat Transfer." Journal of Heat Transfer 117, no. 3 (1995): 597–603. http://dx.doi.org/10.1115/1.2822619.

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This experiment investigated the effects of free-stream turbulence intensity, length scale, Reynolds number, and leading-edge velocity gradient on stagnation-region heat transfer. Heat transfer was measured in the stagnation region of four models with elliptical leading edges downstream of five turbulence-generating grids. Stagnation-region heat transfer augmentation increased with decreasing length scale but ann optimum scale was not found. A correlation was developed that fit heat transfer data for isotropic turbulence to within ±4 percent but did not predict data for anisotropic turbulence.

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Malikov, Zafar, Dilshod Navruzov, and Xikmatulla Djumayev. "Models results Comparison of different approaches to turbulence for flow past a heated flat plate." E3S Web of Conferences 264 (2021): 01008. http://dx.doi.org/10.1051/e3sconf/202126401008.

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This paper compares the results of the well-known Spalart-Allmares (SA) model and the two-fluid model for the flow around a heated flat plate. These models represent different approaches to the problem of turbulence. The SA model is a one-parameter model and a representative of the RANS models. This model is currently the most popular and is used to solve many practical problems. The advantage of this model is that its accuracy is quite good and simple for numerical implementation. Therefore, the SA model is included in almost all the codes of the software package. The two-fluid model used in

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