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Journal articles on the topic 'Turbulence Simulation methods'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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1

Abdibekova, Aigerim, Dauren Zhakebayev, Akmaral Abdigaliyeva, and Kuanysh Zhubat. "Modelling of turbulence energy decay based on hybrid methods." Engineering Computations 35, no. 5 (2018): 1965–77. http://dx.doi.org/10.1108/ec-11-2016-0395.

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Purpose The purpose of this study is to present an exact and fast-calculated algorithm for the modelling of turbulent energy decay based on two different methods: finite-difference and spectral methods. Design/methodology/approach The filtered three-dimensional non-stationary Navier–Stokes equation is used for simulating the turbulent process. The problem is solved using hybrid methods, where the equation of motion is solved using finite difference methods in combination with cyclic penta-diagonal matrix, which allowed to reach high order of accuracy, and Poisson equation is solved using the s

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2

Hami, Khelifa. "Turbulence Modeling a Review for Different Used Methods." International Journal of Heat and Technology 39, no. 1 (2021): 227–34. http://dx.doi.org/10.18280/ijht.390125.

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This contribution represents a critical view of the advantages and limits of the set of mathematical models of the physical phenomena of turbulence. Turbulence models can be grouped into two categories, depending on how turbulent quantities are calculated: direct numerical simulations (DNS) and RANS (Reynolds Averaged Navier-Stokes Equations) models. The disadvantage of these models is that they require enormous computing power, inaccessible, especially for large and complicated geometries. For this reason, hybrid models (combinations between DNS and RANS methods) have been developed, for exam

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3

Persson, L., C. Fureby, and N. Svanstedt. "On Homogenization-Based Methods for Large-Eddy Simulation." Journal of Fluids Engineering 124, no. 4 (2002): 892–903. http://dx.doi.org/10.1115/1.1516577.

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The ability to predict complex engineering flows is limited by the available turbulence models and the present-day computer capacity. In Reynolds averaged numerical simulations (RANS), which is the most prevalent approach today, equations for the mean flow are solved in conjunction with a model for the statistical properties of the turbulence. Considering the limitations of RANS and the desire to study more complex flows, more sophisticated methods are called for. An approach that fulfills these requirements is large-eddy simulation (LES) which attempts to resolve the dynamics of the large-sca

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Remmler, Sebastian, Stefan Hickel, Mark D. Fruman, and Ulrich Achatz. "Validation of Large-Eddy Simulation Methods for Gravity Wave Breaking." Journal of the Atmospheric Sciences 72, no. 9 (2015): 3537–62. http://dx.doi.org/10.1175/jas-d-14-0321.1.

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Abstract To reduce the computational costs of numerical studies of gravity wave breaking in the atmosphere, the grid resolution has to be reduced as much as possible. Insufficient resolution of small-scale turbulence demands a proper turbulence parameterization in the framework of a large-eddy simulation (LES). The authors validate three different LES methods—the adaptive local deconvolution method (ALDM), the dynamic Smagorinsky method (DSM), and a naïve central discretization without turbulence parameterization (CDS4)—for three different cases of the breaking of well-defined monochromatic gr

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5

Ge, Xuan, Giuliano De Stefano, M. Yousuff Hussaini, and Oleg V. Vasilyev. "Wavelet-Based Adaptive Eddy-Resolving Methods for Modeling and Simulation of Complex Wall-Bounded Compressible Turbulent Flows." Fluids 6, no. 9 (2021): 331. http://dx.doi.org/10.3390/fluids6090331.

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This article represents the second part of a review by De Stefano and Vasilyev (2021) on wavelet-based adaptive methods for modeling and simulation of turbulent flows. Unlike the hierarchical adaptive eddy-capturing approach, described in the first part and devoted to high-fidelity modeling of incompressible flows, this companion paper focuses on the adaptive eddy-resolving framework for compressible flows in complex geometries, which also includes model-form adaptation from low to high fidelity models. A hierarchy of wavelet-based eddy-resolving methods of different fidelity has been develope

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Heinz, Stefan. "From Two-Equation Turbulence Models to Minimal Error Resolving Simulation Methods for Complex Turbulent Flows." Fluids 7, no. 12 (2022): 368. http://dx.doi.org/10.3390/fluids7120368.

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Hybrid RANS-LES methods are supposed to provide major contributions to future turbulent flow simulations, in particular for reliable flow predictions under conditions where validation data are unavailable. However, existing hybrid RANS-LES methods suffer from essential problems. A solution to these problems is presented as a generalization of previously introduced continuous eddy simulation (CES) methods. These methods, obtained by relatively minor extensions of standard two-equation turbulence models, represent minimal error simulation methods. An essential observation presented here is that

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7

Hu, Le, Shu Jia Zhang, and Cheng Xu. "The Use of Steady Multi-Phase Position and Unsteady Computational Methods in the Numerical Simulation of Double-Suction Centrifugal Pump." Advanced Materials Research 181-182 (January 2011): 201–5. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.201.

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In order to compare the steady multi-phase and unsteady calculation in double-suction centrifugal pump application, this article simulates the internal turbulent flow of the 150S-50 double suction centrifugal pump. Numerical simulation uses realizable turbulence model, simulating with two methods of steady multi-phase and unsteady in 7 cases. Based on the numerical simulation, the head, shaft power, efficiency were calculated, the simulated performance curves of a double suction centrifugal pump is processed. The results show that: The results of unsteady simulation are closer with the experim

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8

Wang, Ziwei, Jie Cao, Keyan Chen, Baiyu Li, and Bin Li. "Research on Rotation/Curvature Correction Method of SA Turbulence Model for Numerical Simulation of Axial Compressor." Journal of Physics: Conference Series 2599, no. 1 (2023): 012012. http://dx.doi.org/10.1088/1742-6596/2599/1/012012.

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Abstract The strong rotation effect exists in the flow of compressors, but it is rarely considered in the common turbulence models used in numerical simulation. In addition, when the widely used turbulence model is applied to the numerical simulation of compressor flow, it often needs to be modified. In order to evaluate the applicability of various turbulence model modification methods in axial compressor flow simulation, and explore suitable modification methods. Based on the numerical simulation software ASPAC for axial flow compressor developed by our research group, three turbulence model

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9

Temam, Roger. "Multilevel Methods for the Simulation of Turbulence." Journal of Computational Physics 127, no. 2 (1996): 309–15. http://dx.doi.org/10.1006/jcph.1996.0177.

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10

Doubrawa, P., A. Rybchuk, J. Friedrich, et al. "Validation of new and existing methods for time-domain simulations of turbulence and loads." Journal of Physics: Conference Series 2767, no. 5 (2024): 052057. http://dx.doi.org/10.1088/1742-6596/2767/5/052057.

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Abstract We seek to obtain a second-by-second match between the simulated and measured structural loads of a utility-scale wind turbine. To obtain the one-to-one load simulations, we start with the furthest upstream component of the modeling chain: the turbulent inflow. We consider new and existing methods to generate constrained-turbulence flow fields. The new method is based on large-eddy simulations (LES) and machine learning (ML). The existing methods include Kaimal-based TurbSim and the superstatistical wind field model. The inflow measurements used to constrain these simulations are obta

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Sengupta, Tapan K., Vajjala K. Suman, Prasannabalaji Sundaram, and Aditi Sengupta. "Analysis of Pseudo-spectral Methods Used for Numerical Simulations of Turbulence." WSEAS TRANSACTIONS ON COMPUTER RESEARCH 10 (January 19, 2022): 9–24. http://dx.doi.org/10.37394/232018.2022.10.2.

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Events in turbulent flows computed by direct numerical simulation (DNS) are often calibrated with properties based on homogeneous isotropic turbulence, advanced by Kolmogorov, and given in Turbulence, U. Frisch, Cambridge Univ. Press, UK (1995). However, these computational procedures are not calibrated using numerical analyses in order to assess their strengths and weaknesses for DNS. This is with the exception in "A critical assessment of simulations for transitional and turbulence flows- Sengupta, T.K., In Proc. of IUTAM Symp. on Advances in Computation, Modeling and Control of Transitional

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Lushchik, V. G., M. S. Makarova, and A. I. Reshmin. "Numerical Simulation of Turbulent Flow Control." Известия Российской академии наук. Механика жидкости и газа, no. 1 (January 1, 2023): 81–96. http://dx.doi.org/10.31857/s0568528122600473.

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Various methods of flow relaminarization in a pipe are considered by means of controlling the average and turbulent flow parameters. For numerical simulation of flows with turbulence growth and suppression it is proposed to use a three-parameter RANS turbulence model, which has shown good results in modeling existing experiments on relaminarization. Calculations for three variants of inlet devices with different velocity profiles and the same small-scale turbulence at the inlet show the possibility of achieving flow relaminarization in pipes at Reynolds numbers Re 10000. Among three variants o

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Wang, Ziwei, Jie Cao, Xuejiao Jing, Baiyu Li, and Bin Li. "Investigation on Rotation/Curvature Correction Methods of SST Turbulence Model in Numerical Simulation of Axial Compressor." Highlights in Science, Engineering and Technology 77 (November 29, 2023): 24–33. http://dx.doi.org/10.54097/hset.v77i.14355.

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Turbulence models which are widely used in engineering applications usually need correction in axial compressor CFD simulations due to the intense rotation of the system. In order to understand the applicability of rotation-curvature correction methods of turbulence models in numerical simulation of axial compressors, several correction methods were implemented based on SST turbulence model on an inhouse CFD solver ASPAC and numerical simulations were carried out on a transonic compressor Rotor37. The results shows that the rotation/curvature correction models mainly affect the corner separati

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14

Gao, Tianyun, Heiko Schmidt, Marten Klein, et al. "One-dimensional turbulence modeling of compressible flows: II. Full compressible modification and application to shock–turbulence interaction." Physics of Fluids 35, no. 3 (2023): 035116. http://dx.doi.org/10.1063/5.0137435.

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One-dimensional turbulence (ODT) is a simulation methodology that represents the essential physics of three-dimensional turbulence through stochastic resolution of the full range of length and time scales on a one-dimensional domain. In the present study, full compressible modifications are incorporated into ODT methodology, based on an Eulerian framework and a conservative form of the governing equations. In the deterministic part of this approach, a shock capturing scheme is introduced for the first time. In the stochastic part, one-dimensional eddy events are modeled and sampled according t

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Cao, Zhengqing, Kaiyue Fang, Xinchen Zhang, and Xuelong Yang. "Study on the sensitivity of steam ejector simulation to wall treatment methods." Journal of Physics: Conference Series 2707, no. 1 (2024): 012083. http://dx.doi.org/10.1088/1742-6596/2707/1/012083.

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Abstract Considering the importance of turbulence model and wall treatment to steam ejector simulation, the influence of five wall treatment methods on numerical results was studied based on the realizable k-ε turbulence model (RKE). Combined with experimental data and SST turbulence model, the prediction of complex flow phenomena inside the ejector, including shock wave and reflux, by different wall treatment methods is discussed. The results show that under the numerical simulation conditions, the enhanced wall treatment method (EWT) combined with the RKE model can better predict the injecti

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Alam, Jahrul M. "Wavelet Transforms and Machine Learning Methods for the Study of Turbulence." Fluids 8, no. 8 (2023): 224. http://dx.doi.org/10.3390/fluids8080224.

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This article investigates the applications of wavelet transforms and machine learning methods in studying turbulent flows. The wavelet-based hierarchical eddy-capturing framework is built upon first principle physical models. Specifically, the coherent vortex simulation method is based on the Taylor hypothesis, which suggests that the energy cascade occurs through vortex stretching. In contrast, the adaptive wavelet collocation method relies on the Richardson hypothesis, where the self-amplification of the strain field and a hierarchical breakdown of large eddies drive the energy cascade. Wave

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17

Wang, Yannan, Lingling Cao, Zhongfu Cheng, Bart Blanpain, and Muxing Guo. "Mathematical Methodology and Metallurgical Application of Turbulence Modelling: A Review." Metals 11, no. 8 (2021): 1297. http://dx.doi.org/10.3390/met11081297.

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This paper focusses on three main numerical methods, i.e., the Reynolds-Averaged Navier-Stokes (RANS), Large Eddy Simulation (LES), and Direct Numerical Simulation (DNS) methods. The formulation and variation of different RANS methods are evaluated. The advantage and disadvantage of RANS models to characterize turbulent flows are discussed. The progress of LES with different subgrid scale models is presented. Special attention is paid to the inflow boundary condition for LES modelling. Application and limitation of the DNS model are described. Different experimental techniques for model valida

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18

Lu, Yuqing, Jiandong Mao, Yingnan Zhang, et al. "Simulation and Analysis of Mie-Scattering Lidar-Measuring Atmospheric Turbulence Profile." Sensors 22, no. 6 (2022): 2333. http://dx.doi.org/10.3390/s22062333.

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Based on the residual turbulent scintillation theory, the Mie-scattering lidar can measure the intensity of atmospheric turbulence by detecting the light intensity scintillation index of the laser return signal. In order to evaluate and optimize the reliability of the Mie-scattering lidar system for detecting atmospheric turbulence, the appropriate parameters of the Mie-scattering lidar system are selected and optimized using the residual turbulent scintillation theory. Then, the Fourier transform method is employed to perform the numerical simulation of the phase screen of the laser light int

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19

Konnigk, Lucas, Benjamin Torner, Martin Bruschewski, Sven Grundmann, and Frank-Hendrik Wurm. "Equivalent Scalar Stress Formulation Taking into Account Non-Resolved Turbulent Scales." Cardiovascular Engineering and Technology 12, no. 3 (2021): 251–72. http://dx.doi.org/10.1007/s13239-021-00526-x.

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Abstract Purpose Cardiovascular engineering includes flows with fluid-dynamical stresses as a parameter of interest. Mechanical stresses are high-risk factors for blood damage and can be assessed by computational fluid dynamics. By now, it is not described how to calculate an adequate scalar stress out of turbulent flow regimes when the whole share of turbulence is not resolved by the simulation method and how this impacts the stress calculation. Methods We conducted direct numerical simulations (DNS) of test cases (a turbulent channel flow and the FDA nozzle) in order to access all scales of

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20

Glazunov, A. V., E. V. Mortikov, K. V. Barskov, E. V. Kadancev, and S. S. Zilitinkevich. "The layered structure of stably stratified turbulent shear flows." Известия Российской академии наук. Физика атмосферы и океана 55, no. 4 (2019): 13–26. http://dx.doi.org/10.31857/s0002-351555413-26.

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The data of numerical simulation of stably stratified turbulent Couette flows are analyzed for various values of the Richardson number. Two different methods were used: Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES). It is shown that the flow contains large organized structures, along with chaotic turbulence, regardless of the simulation method. These structures appear as inclined layers in the temperature field with weakly stable stratification, separated by very thin layers with large temperature gradients. The existence of such layered structures in nature is indirectly c

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21

Ninokata, Hisashi, and Elia Merzari. "Computer Simulation of Turbulent Flow Phenomena in Nuclear Fuel Pin Subassemblies." Indonesian Journal of Physics 19, no. 1 (2016): 1–11. http://dx.doi.org/10.5614/itb.ijp.2008.19.1.1.

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This paper focuses on the turbulence phenomena that have been identified by computational fluid dynamics (CFD), and that are peculiar to the flows in tight lattice nuclear fuel subassemblies, eccentric annuli and two-rectangular channels interconnected by a narrow gap. The CFD methods employed are the Direct Numerical Simulation of turbulence (DNS) and Large Eddy Simulation (LES) techniques. Highlighted phenomena include turbulence-driven secondary flows inside a subchannel, local turbulent-laminar transition in the narrow gap region between two adjacent fuel pins, and global pulsation of the

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YOKOTA, Rio, and Shinnosuke OBI. "662 Mesh-free Turbulence Simulation Using Vortex Methods." Proceedings of Conference of Tokai Branch 2007.56 (2007): 323–24. http://dx.doi.org/10.1299/jsmetokai.2007.56.323.

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23

Jalali, Masoud, Vamsi K. Chalamalla, and Sutanu Sarkar. "On the Accuracy of Overturn-Based Estimates of Turbulent Dissipation at Rough Topography." Journal of Physical Oceanography 47, no. 3 (2017): 513–32. http://dx.doi.org/10.1175/jpo-d-15-0169.1.

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AbstractEvidence in support of overturn-based methods, often used to infer turbulent dissipation rate from density profiles, is typically from regions with weaker turbulence than that at rough-topography hotspots. The present work uses direct numerical simulations (DNS) of an idealized problem of sloping topography as well as high-resolution large-eddy simulation (LES) of turbulent flow at more realistic topography in order to investigate the accuracy of overturn-based methods in sites with internal wave breaking. Two methods are assessed: Thorpe sorting, where the overturn length LT is based

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Melamed, L. E., and G. A. Filippov. "The concept of turbulent «vortex backfill» - models and methods. Power engineering: research, equipment, technology." Power engineering: research, equipment, technology 21, no. 5 (2019): 97–109. http://dx.doi.org/10.30724/1998-9903-2019-21-5-97-109.

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Models and methods for studying turbulence based on the concept of turbulent "vortex backfill" are presented. The essence of this concept is that the turbulent flow is considered as laminar, flowing through a "vortex backfill ", which creates internal resistance. This resistance can be considered either as distributed, or as locally concentrated. Based on the first representation, a modified Navier-Stokes equation, its approximate analytical and numerical solutions are obtained. Based on the second concept and the local fluctuation method developed for these purposes, a computer model of the t

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Kukshinov, N. V., S. N. Batura, and M. S. Frantsuzov. "Validation of Methods for Calculating Hydrogen Combustion in a Supersonic Model Air Flow Using the Experimental Data of Beach — Evans — Schexnayder." Proceedings of Higher Educational Institutions. Маchine Building, no. 11 (716) (November 2019): 36–45. http://dx.doi.org/10.18698/0536-1044-2019-11-36-45.

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This paper deals with numerical simulation of combustion of a hydrogen-air mixture in a supersonic flow. The simulation is based on solving the complete system of Navier-Stokes equations with closure using the turbulence model and detailed chemical kinetics. The mixing and combustion of a hydrogen-air fuel mixture is considered in the experimental formulation of Beach-Evans-Schexnayder. The effect of various kinetic mechanisms, turbulence models, TCI models, and boundary conditions on the solution is studied qualitatively and quantitatively. The relative errors of mass concentration of water f

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Uddin, M. A., C. Kato, N. Oshima, M. Tanahashi, and T. Miyauchi. "Performance of the Finite Element and Finite Volume Methods for Large Eddy Simulation in Homogeneous Isotropic Turbulence." Journal of Scientific Research 2, no. 2 (2010): 237–49. http://dx.doi.org/10.3329/jsr.v2i2.2582.

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Large eddy simulation (LES) in homogeneous isotropic turbulence is performed by using the Finite element method (FEM) and Finite volume vethod (FVM) and the results are compared to show the performance of FEM and FVM numerical solvers. The validation tests are done by using the standard Smagorinsky model (SSM) and dynamic Smagorinsky model (DSM) for subgrid-scale modeling. LES is performed on a uniformly distributed 643 grids and the Reynolds number is low enough that the computational grid is capable of resolving all the turbulence scales. The LES results are compared with those from direct n

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27

Heinz, Stefan, Joachim Peinke, and Bernhard Stoevesandt. "Cutting-Edge Turbulence Simulation Methods for Wind Energy and Aerospace Problems." Fluids 6, no. 8 (2021): 288. http://dx.doi.org/10.3390/fluids6080288.

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The availability of reliable and efficient turbulent flow simulation methods is highly beneficial for wind energy and aerospace developments. However, existing simulation methods suffer from significant shortcomings. In particular, the most promising methods (hybrid RANS-LES methods) face divergent developments over decades, there is a significant waste of resources and opportunities. It is very likely that this development will continue as long as there is little awareness of conceptional differences of hybrid methods and their implications. The main purpose of this paper is to contribute to

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Erlebacher, G., M. Y. Hussaini, C. G. Speziale, and T. A. Zang. "Toward the large-eddy simulation of compressible turbulent flows." Journal of Fluid Mechanics 238 (May 1992): 155–85. http://dx.doi.org/10.1017/s0022112092001678.

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New subgrid-scale models for the large-eddy simulation of compressible turbulent flows are developed and tested based on the Favre-filtered equations of motion for an ideal gas. A compressible generalization of the linear combination of the Smagorinsky model and scale-similarity model, in terms of Favre-filtered fields, is obtained for the subgrid-scale stress tensor. An analogous thermal linear combination model is also developed for the subgrid-scale heat flux vector. The two dimensionless constants associated with these subgrid-scale models are obtained by correlating with the results of di

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Bulat, Pavel, Pavel Chernyshov, Nikolay Prodan, and Konstantin Volkov. "Control of Aerodynamic Characteristics of Thick Airfoils at Low Reynolds Numbers Using Methods of Boundary Layer Control." Fluids 9, no. 1 (2024): 26. http://dx.doi.org/10.3390/fluids9010026.

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The article explores flow behavior around thick airfoils at low Reynolds numbers and the potential application of energy methods to manipulate the flow field for increased lift and reduced drag. The study relies on a set of propulsion airfoils calculated using a combined approach of solving the inverse problem of aerodynamics and applying stochastic global optimization methods. The calculations consider the transition from laminar to turbulent flow regimes, which significantly affects lift and airfoil drag. The suitability of different turbulence models for airfoil modeling in low Reynolds num

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Chen, Yang, Junyi Cheng та Scott E. Parker. "Evolution of the marker distribution in gyrokinetic δf particle-in-cell simulations". Physics of Plasmas 29, № 7 (2022): 073901. http://dx.doi.org/10.1063/5.0097207.

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The evolution of the particle weight in a [Formula: see text] particle-in-cell simulation depends on the marker distribution that can evolve in a turbulent field due to turbulent diffusion. When Monte Carlo methods are used to implement the test particle collision operator, or when the particle motion is not strictly Hamiltonian in a collisionless simulation, the marker distribution will evolve along the particle trajectory and, in general, cannot be known exactly. A two-dimensional numerical marker distribution is proposed as an approximation. It is shown to be advantageous over other common

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Dang, Ying Y., Gopal H. Gaonkar, and J. V. R. Prasad. "Parallel Methods for Turbulence Simulation and Helicopter-Response Prediction." Journal of the American Helicopter Society 41, no. 3 (1996): 219–31. http://dx.doi.org/10.4050/jahs.41.219.

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Bañón Navarro, A., B. Teaca, F. Jenko, G. W. Hammett, and T. Happel. "Applications of large eddy simulation methods to gyrokinetic turbulence." Physics of Plasmas 21, no. 3 (2014): 032304. http://dx.doi.org/10.1063/1.4868235.

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Matheou, Georgios. "Turbulence Structure in a Stratocumulus Cloud." Atmosphere 9, no. 10 (2018): 392. http://dx.doi.org/10.3390/atmos9100392.

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The growth of computing power combined with advances in modeling methods can yield high-fidelity simulations establishing numerical simulation as a key tool for discovery in the atmospheric sciences. A fine-scale large-eddy simulation (LES) utilizing 1.25 m grid resolution and 5.12 × 5.12 km 2 horizontal domain is used to investigate the turbulence and liquid water structure in a stratocumulus cloud. The simulations capture the observed cloud morphology, including elongated regions of low liquid water path, cloud holes, and pockets of clear air within the cloud. The cloud can be partitioned in

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Schmid, Manuel F., Marco G. Giometto, Gregory A. Lawrence, and Marc B. Parlange. "BoundaryLayerDynamics.jl v1.0: a modern codebase for atmospheric boundary-layer simulations." Geoscientific Model Development 17, no. 1 (2024): 321–33. http://dx.doi.org/10.5194/gmd-17-321-2024.

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Abstract. We present BoundaryLayerDynamics.jl, a new code for turbulence-resolving simulations of atmospheric boundary-layer flows as well as canonical turbulent flows in channel geometries. The code performs direct numerical simulation as well as large-eddy simulation using a hybrid (pseudo)spectral and finite-difference approach with explicit time advancement. Written in Julia, the code strives to be flexible and adaptable without sacrificing performance, and extensive automated tests aim to ensure that the implementation is and remains correct. We show that the simulation results are in agr

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Jaiswal, Atul, Minh Duc Bui, and Peter Rutschmann. "Evaluation of RANS-DEM and LES-DEM Methods in OpenFOAM for Simulation of Particle-Laden Turbulent Flows." Fluids 7, no. 10 (2022): 337. http://dx.doi.org/10.3390/fluids7100337.

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CFD-DEM modelling of particle-laden turbulent flow is challenging in terms of the required and obtained CFD resolution, heavy DEM computations, and the limitations of the method. Here, we assess the efficiency of a particle-tracking solver in OpenFOAM with RANS-DEM and LES-DEM approaches under the unresolved CFD-DEM framework. Furthermore, we investigate aspects of the unresolved CFD-DEM method with regard to the coupling regime, particle boundary condition and turbulence modelling. Applying one-way and two-way coupling to our RANS-DEM simulations demonstrates that it is sufficient to include

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Sigalotti, Leonardo Di G., Carlos E. Alvarado-Rodríguez, Jaime Klapp, and José M. Cela. "Smoothed Particle Hydrodynamics Simulations of Water Flow in a 90° Pipe Bend." Water 13, no. 8 (2021): 1081. http://dx.doi.org/10.3390/w13081081.

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The flow through pipe bends and elbows occurs in a wide range of applications. While many experimental data are available for such flows in the literature, their numerical simulation is less abundant. Here, we present highly-resolved simulations of laminar and turbulent water flow in a 90° pipe bend using Smoothed Particle Hydrodynamics (SPH) methods coupled to a Large-Eddy Simulation (LES) model for turbulence. Direct comparison with available experimental data is provided in terms of streamwise velocity profiles, turbulence intensity profiles and cross-sectional velocity maps at different st

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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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Heinz, Stefan. "The Asymptotic Structure of Canonical Wall-Bounded Turbulent Flows." Fluids 9, no. 1 (2024): 25. http://dx.doi.org/10.3390/fluids9010025.

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Our ability to reliably and efficiently predict complex high-Reynolds-number (Re) turbulent flows is essential for dealing with a large variety of problems of practical relevance. However, experiments as well as computational methods such as direct numerical simulation (DNS) and large eddy simulation (LES) face serious questions regarding their applicability to high Re turbulent flows. The most promising option to create reliable guidelines for experimental and computational studies is the use of analytical conclusions. An essential criterion for the reliability of such analytical conclusions

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Shi, Jingchang, and Hong Yan. "Turbulence amplification in the shock wave/turbulent boundary layer interaction over compression ramp by the flux reconstruction method." Physics of Fluids 35, no. 1 (2023): 016122. http://dx.doi.org/10.1063/5.0134222.

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Wall-resolved large eddy simulation on a supersonic turbulent boundary layer over a [Formula: see text] compression ramp is performed under the framework of high order discontinuous methods for a free-stream Mach number [Formula: see text] and Reynolds number [Formula: see text]. The turbulent flow is resolved by the high order flux reconstruction method, and the shock is captured by a high-resolution, but stable weighted essentially non-oscillation limiter. The solver used in this paper is validated by the double Mach reflection case and the Taylor–Green vortex case. The results of shock wave

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Lushchik, V. G., M. S. Makarova, and A. I. Reshmin. "Numerical Simulation of Turbulent Flow Control at Pipe Inlet to Advance Flow Relaminarization." Fluid Dynamics 58, no. 1 (2023): 57–71. http://dx.doi.org/10.1134/s0015462822601954.

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Abstract Various methods of flow relaminarization in a pipe are considered by means of controlling the average and turbulent flow parameters. For numerical simulation of flows with turbulence growth and suppression it is proposed to use a three-parameter RANS turbulence model, which has shown good results in modeling existing experiments on relaminarization. Calculations for three variants of inlet devices with different velocity profiles and the same small-scale turbulence at the inlet show the possibility of achieving flow relaminarization in pipes at Reynolds numbers Re > 10 000. Among t

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Marty, Julien, and Cédric Uribe. "Impact of Underlying RANS Turbulence Models in Zonal Detached Eddy Simulation: Application to a Compressor Rotor." International Journal of Turbomachinery, Propulsion and Power 5, no. 3 (2020): 22. http://dx.doi.org/10.3390/ijtpp5030022.

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The present study focuses on the impact of the underlying RANS turbulence model in the Zonal Detached Eddy Simulation (ZDES) method when used for secondary flow prediction. This is carried out in light of three issues commonly investigated for hybrid RANS/LES methods (detection and protection of attached boundary layer, emergence, and growth of resolved turbulent fluctuations and accurate prediction of separation front due to progressive adverse pressure gradient). The studied configuration is the first rotor of a high pressure compressor. Three different turbulence modelings (Spalart and Allm

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O’Reilly, Christopher M., Stephan T. Grilli, Christian F. Janßen, Jason M. Dahl, and Jeffrey C. Harris. "Hybrid Lattice-Boltzmann-Potential Flow Simulations of Turbulent Flow around Submerged Structures." Journal of Marine Science and Engineering 10, no. 11 (2022): 1651. http://dx.doi.org/10.3390/jmse10111651.

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We report on the development and validation of a 3D hybrid Lattice Boltzmann Model (LBM), with Large Eddy Simulation (LES), to simulate the interactions of incompressible turbulent flows with ocean structures. The LBM is based on a perturbation method, in which the velocity and pressure are expressed as the sum of an inviscid flow and a viscous perturbation. The far- to near-field flow is assumed to be inviscid and represented by potential flow theory, which can be efficiently modeled with a Boundary Element Method (BEM). The near-field perturbation flow around structures is modeled by the Nav

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Taylor, J. R., S. M. de Bruyn Kops, C. P. Caulfield, and P. F. Linden. "Testing the Assumptions Underlying Ocean Mixing Methodologies Using Direct Numerical Simulations." Journal of Physical Oceanography 49, no. 11 (2019): 2761–79. http://dx.doi.org/10.1175/jpo-d-19-0033.1.

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AbstractDirect numerical simulations of stratified turbulence are used to test several fundamental assumptions involved in the Osborn, Osborn–Cox, and Thorpe methods commonly used to estimate the turbulent diffusivity from field measurements. The forced simulations in an idealized triply periodic computational domain exhibit characteristic features of stratified turbulence including intermittency and layer formation. When calculated using the volume-averaged dissipation rates from the simulations, the vertical diffusivities inferred from the Osborn and Osborn–Cox methods are within 40% of the

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HUNT, J. C. R., N. D. SANDHAM, J. C. VASSILICOS, B. E. LAUNDER, P. A. MONKEWITZ, and G. F. HEWITT. "Developments in turbulence research: a review based on the 1999 Programme of the Isaac Newton Institute, Cambridge." Journal of Fluid Mechanics 436 (June 10, 2001): 353–91. http://dx.doi.org/10.1017/s002211200100430x.

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Recent research is making progress in framing more precisely the basic dynamical and statistical questions about turbulence and in answering them. It is helping both to define the likely limits to current methods for modelling industrial and environmental turbulent flows, and to suggest new approaches to overcome these limitations. Our selective review is based on the themes and new results that emerged from more than 300 presentations during the Programme held in 1999 at the Isaac Newton Institute, Cambridge, UK, and on research reported elsewhere. A general conclusion is that, although turbu

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Da Vià, Roberto, Valentina Giovacchini, and Sandro Manservisi. "A Logarithmic Turbulent Heat Transfer Model in Applications with Liquid Metals for Pr = 0.01–0.025." Applied Sciences 10, no. 12 (2020): 4337. http://dx.doi.org/10.3390/app10124337.

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The study of turbulent heat transfer in liquid metal flows has gained interest because of applications in several industrial fields. The common assumption of similarity between the dynamical and thermal turbulence, namely, the Reynolds analogy, has been proven to be invalid for these fluids. Many methods have been proposed in order to overcome the difficulties encountered in a proper definition of the turbulent heat flux, such as global or local correlations for the turbulent Prandtl number and four parameter turbulence models. In this work we assess a four parameter logarithmic turbulence mod

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Dietzel, Dirk, Danny Messig, Federico Piscaglia, et al. "Evaluation of scale resolving turbulence generation methods for Large Eddy Simulation of turbulent flows." Computers & Fluids 93 (April 2014): 116–28. http://dx.doi.org/10.1016/j.compfluid.2014.01.013.

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Péter, Brúnó, and István Lakatos. "Comparison of Different Turbulence Models and Wall Treatment Methods for Vehicle Aerodynamics Investigations." Periodica Polytechnica Transportation Engineering 52, no. 1 (2023): 67–74. http://dx.doi.org/10.3311/pptr.22671.

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In this paper two different turbulence models and wall treatment methods were investigated with Computational Fluid Dynamics (CFD) method. The used geometry for the research was the Ahmed body. The Ahmed body is a widely used geometry in vehicle aerodynamics investigations. The geometry represents a simplified vehicle, which allows the researchers to make examinations with moderate resources. The simulations were made in Ansys Fluent. The environment of the simulation was built to optimize for maximum 8 GB RAM. The paper examines the difference between the k-ω SST and the k-ε turbulence models

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Wang, Yi, Giulio Vita, Bruño Fraga, Jianchun Wang, and Hassan Hemida. "Effect of the Inlet Boundary Conditions on the Flow over Complex Terrain Using Large Eddy Simulation." Designs 5, no. 2 (2021): 34. http://dx.doi.org/10.3390/designs5020034.

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For large eddy simulation, it is critical to choose the suitable turbulent inlet boundary condition as it significantly affects the calculated flow field. In this paper, the effect of different inlet boundary conditions, including random method (RAND), Lund method, and divergence-free synthetic eddies method (DFSEM), on the flow in a channel with a hump are investigated through large-eddy simulation. The simulation results are further compared with experimental data. It has been found that turbulence is nearly fully developed in the case based on the Lund method, not fully developed in the cas

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Qin, Denghui, and Xun Huang. "Numerical investigation on the rotor-turbulence interaction noise." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A144. http://dx.doi.org/10.1121/10.0023065.

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Noise from a turbomachinery component, such as compressors and turbines, is an important issue to be resolved in aerospace and ocean engineering applications. The rotor of a turbomachinery assembly usually could operate downstream to other flow structures (fuselages, stators, control surfaces, etc.) that produce either large-scale or small-scale turbulence structures, which are highly complex and are being distorted while they are ingested into the rotor, which generate the rotor-turbulence interaction noise. The presented work conducted numerical simulation research on a ten-bladed rotor inge

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Branislav, Basara, and Girimaji Sharath S. "1099 MODELLING OF THE CUT-OFF SCALE SUPPLYING VARIABLE IN BRIDGING METHODS FOR TURBULENCE FLOW SIMULATION." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013): _1099–1_—_1099–6_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._1099-1_.

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