Thematische Bibliographien / URANS model

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Auswahl der wissenschaftlichen Literatur zum Thema „URANS model“

Autor: Grafiati

Veröffentlicht am 7. Juli 2024

Zuletzt aktualisiert am 31. Juli 2025

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Zeitschriftenartikel zum Thema "URANS model"

Guan, Lixian, and Dan Zhao. "Numerical prediction nonlinear heat-driven acoustics behaviours in standing-wave thermoacoustic engines using stress-blended Eddy simulation method." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A38. http://dx.doi.org/10.1121/10.0018072.

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The present work investigated a standing-wave heat-driven thermoacoustic engine (SWTAE) system by capturing its nonlinear thermoacoustic features with three-dimensional (3D) unsteady Reynolds-Averaged Navier-Stokes (URANS) and hybrid URANS/LES (large Eddy simulation) models such as detached-Eddy simulations (DES) and stress-blended Eddy simulation (SBES) models. The comparison studies show that the prediction of the acoustic power of SWTAE using URANS is about 21.0% lower than that using LES, while the results from SBES and DES are relatively in good agreement with LES. Comparative studies of

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Giri, Ajay Adhyanth, Laurence Morgan, Yan Wu, et al. "Aerodynamic model comparison for an X-shaped vertical-axis wind turbine." Wind Energy Science 9, no. 2 (2024): 453–70. https://doi.org/10.5194/wes-9-453-2024.

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This article presents a comparison study of different aerodynamic models for an X-shaped verticalaxis wind turbine and offers insight into the 3D aerodynamics of this rotor at fixed pitch offsets. The study compares six different numerical models: a double-multiple streamtube (DMS) model, a 2D actuator cylinder (2DAC) model, an inviscid free vortex wake model (from CACTUS), a free vortex wake model with turbulent vorticity (from QBlade), a blade-resolved unsteady Reynolds-averaged Navier–Stokes (URANS) model, and a lattice Boltzmann method (from PowerFLOW). All models, except URANS and P

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Giri Ajay, Adhyanth, Laurence Morgan, Yan Wu, et al. "Aerodynamic model comparison for an X-shaped vertical-axis wind turbine." Wind Energy Science 9, no. 2 (2024): 453–70. http://dx.doi.org/10.5194/wes-9-453-2024.

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Abstract. This article presents a comparison study of different aerodynamic models for an X-shaped vertical-axis wind turbine and offers insight into the 3D aerodynamics of this rotor at fixed pitch offsets. The study compares six different numerical models: a double-multiple streamtube (DMS) model, a 2D actuator cylinder (2DAC) model, an inviscid free vortex wake model (from CACTUS), a free vortex wake model with turbulent vorticity (from QBlade), a blade-resolved unsteady Reynolds-averaged Navier–Stokes (URANS) model, and a lattice Boltzmann method (from PowerFLOW). All models, except URANS

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Baungaard, M., M. P. Van Der Laan, M. Kelly, and E. L. Hodgson. "Simulation of a conventionally neutral boundary layer with two-equation URANS." Journal of Physics: Conference Series 2767, no. 5 (2024): 052013. http://dx.doi.org/10.1088/1742-6596/2767/5/052013.

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Abstract Simulating conventionally neutral boundary layers (CNBLs) with the unsteady Reynolds-Averaged Navier-Stokes (URANS) technique is investigated in this paper using a modified two-equation linear eddy viscosity turbulence model. For CNBLs over a flat and uniform surface, as typically used as the inflow to wind farm simulations, the governing equations of URANS can be solved with a one-dimensional solver, which makes the simulation of a typical CNBL five to six orders of magnitude faster than with large-eddy simulation (LES) approaches. However, URANS on the other hand requires more model

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Klimczyk, Witold, and Adam Sieradzki. "Airofil Tonal Noise Prediction Using Urans." Transactions on Aerospace Research 2023, no. 4 (2023): 1–17. http://dx.doi.org/10.2478/tar-2023-0019.

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Abstract To examine the feasibility of the laminar boundary layer (LBL), vortex shedding (VS) tonal noise modelling using unsteady Reynolds-averaged Navier–Stokes (URANS) was investigated for the non-symmetric S834 airfoil. A transition SST turbulence model was used to model the laminar-turbulent transition and its vital influence on the laminar bubble and hydrodynamic instabilities generation. The influence of turbulence on the unsteady vortex patterns was investigated. Hence, the hybrid aeroacoustic analysis with Lighthill analogy was conducted to obtain the acoustic pressure field. The appr

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Saha, A. K., and Sumanta Acharya. "Flow and Heat Transfer in an Internally Ribbed Duct With Rotation: An Assessment of Large Eddy Simulations and Unsteady Reynolds-Averaged Navier-Stokes Simulations." Journal of Turbomachinery 127, no. 2 (2004): 306–20. http://dx.doi.org/10.1115/1.1861917.

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Large eddy simulations (LES) and unsteady Reynolds averaged Navier-Stokes (URANS) simulations have been performed for flow and heat transfer in a rotating ribbed duct. The ribs are oriented normal to the flow and arranged in a staggered configuration on the leading and trailing surfaces. The LES results are based on a higher-order accurate finite difference scheme with a dynamic Smagorinsky model for the subgrid stresses. The URANS procedure utilizes a two equation k-ε model for the turbulent stresses. Both Coriolis and centrifugal buoyancy effects are included in the simulations. The URANS co

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Wu, Huajie, and Shanwen Zhang. "Flow field analysis of Ahmed model based on URANS." Journal of Physics: Conference Series 1983, no. 1 (2021): 012021. http://dx.doi.org/10.1088/1742-6596/1983/1/012021.

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Kamalov, Bagdaulet, Sagidolla Batay, Dinmukhamed Zhangaskhanov, Yong Zhao, and Eddie Yin Kwee Ng. "Arbitrary Hybrid Turbulence Modeling Approach for High-Fidelity NREL Phase VI Wind Turbine CFD Simulation." Fluids 7, no. 7 (2022): 236. http://dx.doi.org/10.3390/fluids7070236.

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Today, growth in renewable energy is increasing, and wind energy is one of the key renewable energy sources which is helping to reduce carbon emissions and build a more sustainable world. Developed countries and worldwide organizations are investing in technology and industrial application development. However, extensive experiments using wind turbines are expensive, and numerical simulations are a cheaper alternative for advanced analysis of wind turbines. The aerodynamic properties of wind turbines can be analyzed and optimized using CFD tools. Currently, there is a general lack of available

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Gavrilov, Andrey, and Yaroslav Ignatenko. "Numerical Simulation of Taylor—Couette—Poiseuille Flow at Re = 10,000." Fluids 8, no. 10 (2023): 280. http://dx.doi.org/10.3390/fluids8100280.

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A fully developed turbulent flow in a concentric annulus, Re =10,000, ri/ro=0.5, with an inner rotating cylinder in the velocity range N=Uω/Ub=0÷4, is studied via a large-eddy simulation. Also, for comparison, simulations by steady-state, unstatiounary RANS k-ω SST (URANS), and Elliptic Blending Model (EBM) were made. The main focus of this study is on the effect of high rotation on the mean flow, turbulence statistics, and vortex structure. Distribution of the tangential velocity and the Reynolds stress tensor change their behaviour at N>0.5∼1. With rotation increases, the production of ta

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Ehrle, Maximilian, Andreas Waldmann, Thorsten Lutz, and Ewald Krämer. "Simulation of transonic buffet with an automated zonal DES approach." CEAS Aeronautical Journal 11, no. 4 (2020): 1025–36. http://dx.doi.org/10.1007/s13272-020-00466-7.

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Abstract A study of transonic buffet on the NASA Common Research Model at flight Reynolds numbers is presented. The ability of two different hybrid RANS/LES models as well as the URANS approach for resolving three-dimensional buffet motion was evaluated by means of spectral analysis. Automated Zonal DES and URANS simulations show similar results in terms of buffet frequency and spanwise propagation of buffet cells, whereas the Delayed Detached Eddy Simulation results indicate a strong interaction between flow separation and shock motion. The extracted characteristic frequencies which are assoc

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Dissertationen zum Thema "URANS model"

Durrani, Faisal. "Using large eddy simulation to model buoyancy-driven natural ventilation." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12488.

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The use of Large Eddy Simulation (LES) for modelling air flows in buildings is a growing area of Computational Fluid Dynamics (CFD). Compared to traditional CFD techniques, LES provides a more detailed approach to modelling turbulence in air. This offers the potential for more accurate modelling of low energy natural ventilation which is notoriously difficult to model using traditional CFD. Currently, very little is known about the performance of LES for modelling natural ventilation, and its computational intensity makes its practical use on desk top computers prohibitive. The objective of th

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Alam, Boulos. "Modélisation numérique de la turbulence et de la dispersion atmosphérique par faibles vents en milieu urbain." Electronic Thesis or Diss., université Paris-Saclay, 2023. https://www.biblio.univ-evry.fr/theses/2023/interne/2023UPAST179.pdf.

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Cette thèse se situe dans le contexte de la modélisation de la dispersion atmosphérique, en particulier en présence de vents faibles. Les sources de pollution atmosphérique, souvent situées près du sol et influencées par des obstacles complexes, engendrent des concentrations élevées de polluants à proximité, ce qui se traduit par des fluctuations significatives de ces concentrations. Les vents faibles, généralement associés à des conditions atmosphériques stables, posent un défi particulier en matière de modélisation de la dispersion des polluants, nécessitant une analyse approfondie des donné

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Charrière, Boris. "Modélisation et simulation d'écoulements turbulents cavitants avec un modèle de transport de taux de vide." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI108/document.

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La simulation numérique des écoulements turbulents cavitants revêt de nombreuses difficultés tant dans la modélisation des phénomènes physiques que dans le développement de méthodes numériques robustes. En effet de tels écoulements sont caractérisés par un changement de phase associé à des gradients de la masse volumique, des variations du nombre de Mach causées par une chute de la vitesse du son, des zones de turbulence diphasique et la présence d'instationnarités.Les travaux de la présente thèse s'inscrivent dans la continuité des études expérimentales et numériques menées au sein du Laborat

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Paillard, Benoît. "Simulation numérique et optimisation d'une hydrolienne à axe transverse avec contrôle actif de l'angle de calage." Brest, 2011. http://www.theses.fr/2011BRES2069.

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Cette thèse s’inscrit dans le contexte de la simulation d’efforts et d’écoulement dynamiques autour d’un profil en mouvement complexe dans un écoulement uniforme : la combinaison d’une rotation autour d’un axe distant et d’un tangage classique autour du quart de corde. Elle vise à mettre en place des méthodes de simulation simples de dimensionnement et de prédiction de performance d’une turbine Darrieus à contrôle actif de pas ; elle vise également à proposer une méthode de calcul permettant la simulation de l’écoulement et l’optimisation de ce type de turbine dont les pales ont leur calage qu

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Grondin, Julissa. "Analyse des instabilités et de la restabilisation d'un rouet centrifuge à régime partiel." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC019.

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Ce manuscrit présente une étude numérique des instabilités aérodynamiques dans le compresseur centrifuge Turbocel, actuellement en essais au LMFA. L’étude vise à mieux comprendre les mécanismes des instabilités tournantes et de la restabilisation à bas débit observées dans le compresseur à régime partiel. L’étude est restreinte au rouet seul sans prendre en compte les autres composants de l’étage (Roue Directrice d’Entrée et diffuseur radial), au moyen de simulations RANS et URANS d'un seul canal (conditions de périodicité aux frontières latérales), à une iso-vitesse à régime partiel. Le code

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Dominguez, Bermudez Favio Enrique. "Simulation numérique de parcs d'hydroliennes à axe vertical carénées par une approche de type cylindre actif." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI020.

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La récupération, grâce aux hydroliennes, de l’énergie cinétique de courants marins et fluviaux constitue une source d’énergie renouvelable considérable et prédictible. La simulation fine, par une description statistique instationnaire de type URANS, de l’écoulement autour d’une hydrolienne isolée à axe vertical, bi-rotor et munie d’un carénage (hydrolienne de type HARVEST) donne accès à une estimation précise de la puissance produite. Cependant, le coût élevé de cette approche URANS la rend inadaptée à la simulation d’un parc de machines. Une analyse de la littérature conduit à retenir un modè

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Oliveira, Paulo Roberto de. "Modelos de urnas e loterias." Universidade Federal de Goiás, 2014. http://repositorio.bc.ufg.br/tede/handle/tede/3960.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2015-01-27T13:45:09Z No. of bitstreams: 2 license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Dissertação - Paulo Roberto de Oliveira - 2014.pdf: 3459807 bytes, checksum: b199bab67e773541a99d42adfc9dce03 (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-01-28T11:28:00Z (GMT) No. of bitstreams: 2 license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Dissertação - Paulo Roberto de Oliveira - 2014.pdf: 3459807 bytes, checksum: b199bab67e773541a99d42adfc9dce03 (

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Robertson, Francis. "An experimental investigation of the drag on idealised rigid, emergent vegetation and other obstacles in turbulent free-surface flows." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/an-experimental-investigation-of-the-drag-on-idealised-rigid-emergent-vegetation-and-other-obstacles-in-turbulent-freesurface-flows(07165357-67da-461d-a6a2-ed4970e2cb0c).html.

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Vegetation is commonly modelled as emergent arrays of rigid, circular cylinders. However, the drag coefficient (CD) of real stems or trunks is closer to that of cylinders with a square cross-section. In this thesis, vegetation has been idealised as square cylinders in laboratory experiments with a turbulence intensity of the order of 10% which is similar to that of typical river flows. These cylinders may also represent other obstacles such as architectural structures. This research has determined CD of an isolated cylinder and cylinder pairs as a function of position as well as the average dr

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Bedon, Gabriele. "Aero-Structural Optimization of Vertical Axis Wind Turbines." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424493.

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This Thesis focuses on the aero-structural simulation and optimization of Darrieus Vertical Axis Wind Turbines. Aerodynamic simulation tools based on different techniques are developed, improved with respect to state-of-art tools, and validated against experimental data. The main considered approaches are based on the Blade Element Momentum, Vortex, two- and three-dimensional Unsteady Reynolds-Averaged Navier-Stokes (URANS) Computational Fluid Dynamics (CFD) models. The models are developed keeping in mind the final coupling with an optimization algorithm, therefore with particular emphasi

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Junior, Silvio Rodrigues de Faria. "Genotipagem de poliplóides: um modelo de urnas e bolas." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-08092013-214551/.

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Desde os primórdios da agricultura e pecuária, o homem seleciona indivíduos com características desejáveis para reprodução e aumento da proporção de novos indivíduos com tais qualidades. Com o conhecimento da estrutura de DNA e o advento da engenharia genética, a identificação e caracterização de espécies e indivíduos conta com novas tecnologias para auxiliar no desenvolvimento de novas variedades de plantas e animais para diversos fins. Tais tecnologias envolvem procedimentos bioquímicos e físicos cada vez mais apurados que produzem medidas cada vez mais precisas, um exemplo disso são as técn

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Bücher zum Thema "URANS model"

United States. National Aeronautics and Space Administration., ed. Voyager radio occultation by the Uranian rings: Structure, dynamics, and particle sizes. Center for Radar Astronomy, Stanford Electronics Laboratories, Stanford University, 1990.

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Shen, Xiuzhong. KUR teinōshuku uran shirisaido nenryō roshin no anzen kaiseki. Kyōto Daigaku Genshiro Jikkenjo, 2010.

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Evans, D. R. Non-dipolar magnetic field models and patterns of radio emission: Uranus and Neptune compared : final report. National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration., ed. Non-dipolar magnetic field models and patterns of radio emission: Uranus and Neptune compared : final report. National Aeronautics and Space Administration, 1994.

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Maldonado, Marta Fraile. Cuando la economía entra en las urnas: El voto económico en España, 1979-1996. Centro de Investigaciones Sociológicas, 2005.

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J, Gierasch Peter, Leroy Stephen S, and United States. National Aeronautics and Space Administration., eds. Temperature and circulation in the stratospheres of the outer planets. National Aeronautics and Space Administration, 1989.

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Hadorn, Benjamin. Designing for Human-Machine Symbiosis Using the URANOS Model: Emerging Research and Opportunities. IGI Global, 2017.

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Sarotte, Mary Elise. Heroic Aspirations in 1990. Princeton University Press, 2017. http://dx.doi.org/10.23943/princeton/9780691163710.003.0004.

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This chapter discusses former Secretary General Mikhail Gorbachev's challenge to his own original plan: a heroic model of multinationalism. Gorbachev dropped the restoration concept entirely and instead proposed to build a vast new edifice from the Atlantic to the Urals: the fulfillment of his desire to create a common European home of many rooms. States under this model would retain their own political orders, but cooperate via international economic and military institutions. Ironically, former East German dissident movements proposed a similar model. They wanted new construction as well, th

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Fandiño Bohórquez, Andrés. Participación de las víctimas en la Jurisdicción Especial para la Paz (JEP) ¿Verdadera participación? Universidad Libre Sede Principal, 2017. http://dx.doi.org/10.18041/978-958-5466-80-7.

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A dos años del Acuerdo Colón (24 de noviembre de 2016), la incertidumbre y las esperanzas afloran en materia de implementación del Acuerdo suscrito entre el gobierno colombiano y el exgrupo guerrillero FARC. No es para menos, la lectura de vaso medio lleno o medio vacío no se hace esperar. Más de cuatro complejos años de negociación para la construcción de un documento histórico, leído de forma positiva por la Comunidad Internacional y los expertos en terminación de conflictos en el mundo, pero seriamente cuestionado en el marco interno por aquellos que aún veían en la guerra una opción para C

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Buchteile zum Thema "URANS model"

Choi, Seongwook, and Sung-Uk Choi. "Numerical Simulation of Submerged Hydraulic Jump Using a Urans Model." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. https://doi.org/10.1007/978-981-97-6009-1_1.

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Nicolas, Xavier, Hua Sun, and Yannick Sommerer. "Reference Solutions and URANS Model Characterization for Turbulent Forced Convection Around Heated Square Cylinders." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65820-5_6.

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Masoodi, Faiz Azhar, and Rahul Goyal. "Capability Assessment of URANS Turbulence Models for Simulation of Vortex Rope-Related Flow Defect in a Model Francis Turbine." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1033-1_2.

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Jacobs, Bart. "Drawing from an Urn is Isometric." In Lecture Notes in Computer Science. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-57228-9_6.

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AbstractDrawing (a multiset of) coloured balls from an urn is one of the most basic models in discrete probability theory. Three modes of drawing are commonly distinguished: multinomial (draw-replace), hypergeometric (draw-delete), and Pólya (draw-add). These drawing operations are represented as maps from urns to distributions over multisets of draws. The set of urns is a metric space via the Wasserstein distance. The set of distributions over draws is also a metric space, using Wasserstein-over-Wasserstein. The main result of this paper is that the three draw operations are all isometries, t

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Layton, W., and M. McLaughlin. "On URANS Congruity with Time Averaging: Analytical Laws Suggest Improved Models." In Mathematical Analysis With Applications. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42176-2_10.

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Fedorova, N., L. Muravyev, and A. Roublev. "Earth’s Crust Magnetization Model of the Nether-Polar and Polar Urals." In Springer Proceedings in Earth and Environmental Sciences. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-97670-9_20.

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Рanteleeva, Alexandra V., and Aleksandr V. Snachev. "Model of Formation of the Kumak Gold Deposit (Southern Urals, Russia)." In Springer Geology. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-60966-4_6.

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Barklage, Alexander, and Rolf Radespiel. "Interaction of Wake and Propulsive Jet Flow of a Generic Space Launcher." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_8.

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Abstract This work investigates the interaction of the afterbody flow with the propulsive jet flow on a generic space launcher equipped with two alternative nozzle concepts and different afterbody geometries. The flow phenomena are characterized by experimental measurements and numerical URANS and LES simulations. Investigations concern a configuration with a conventional truncated ideal contour nozzle and a configuration with an unconventional dual-bell nozzle. In order to attenuate the dynamic loads on the nozzle fairing, passive flow control devices at the base of the launcher main body are

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Samuylov, Valery, Mikhail Petrov, and Tatyana Kargapoltseva. "A Model of Cluster-Modular Development of Passenger Traffic in the Urals Federal District, Russia." In VIII International Scientific Siberian Transport Forum. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37919-3_115.

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Gomez, I., M. Chavez, J. de Vicente, and E. Valero. "Numerical Evaluation of URANS/Zonal-DES Models in the Acoustic Prediction of a High Reynolds Compressible Open Cavity Flow." In Progress in Hybrid RANS-LES Modelling. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31818-4_25.

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Konferenzberichte zum Thema "URANS model"

Hong, Yoonpyo, Dawoon Lee, Yu-Eop Kang, and Kwanjung Yee. "Rotor Blade Design Optimization with Airfoil Consideration Using Advanced Reduced Order Models." In Vertical Flight Society 80th Annual Forum & Technology Display. The Vertical Flight Society, 2024. http://dx.doi.org/10.4050/f-0080-2024-1261.

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This paper introduces ABC2, an advanced framework for rotor blade design optimization that can effectively consider the airfoil shape variations during optimization process. A major component of this framework is an reduced-order model (ROM) that leverages deep-neural-network techniques both for airfoil parameterization and performance prediction. Utilizing the UIUC airfoil database and a two-dimensional unsteady Reynolds-averaged Navier-Stokes (URANS) solver, the ROM can effectively control the airfoil shapes and predict the resulting aerodynamic performance across the wide range of flow cond

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Gopalan, Harish, Peifeng Ma, Haihua Xu, Ankit Choudhary, Anis Hussain, and Rajeev K. Jaiman. "Hybrid RANS-LES Formulations for Wake Interference Physics in Tandem Cylinders and Multi-Column Floaters." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41145.

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Accurate prediction of hydrodynamic forces on tandem bluff bodies at high Reynolds numbers is of interest in many fields of offshore engineering. The most commonly used turbulence modeling strategy for studying these flows is unsteady Reynolds-averaged Navier-Stokes methods (URANS) due to its speed. However, the accuracy of URANS results are problem dependent and usually poor for bluff bodies flow separation predictions. To overcome this deficiency, two different modeling methods have been considered: (i) large eddy simulation (LES) and (ii) non-linear URANS. LES are accurate and computational

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Kelly, Ryan T., and Aleksandar Jemcov. "Application of a Hybrid URANS/LES Turbulence Model to Turbomachinery Flows." In THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer. Begellhouse, 2018. http://dx.doi.org/10.1615/thmt-18.750.

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Bhushan, S., D. K. Walters, E. Merzari, and A. Obabko. "Implementation and Validation of a Hybrid RANS/LES Model in the Spectral Element Solver Nek5000." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-22055.

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A dynamic hybrid RANS/LES (DHRL) model has been implemented in the spectral-element solver Nek5000 to reduce computational expense for high Reynolds number applications. The model couples a k-ε URANS model and the dynamic Smagorinsky model for LES. The model is validated for plane channel flow at Reτ = 590 using DNS data, and compared with LES predictions. The model is then applied for the ANL-MAX case, which is a test case relevant to nuclear reactor cooling flow simulations. For the channel flow case, DHRL predictions were similar to LES on finer grids, but on coarser grids, the former predi

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Elkhoury, M., J. Najem, and Z. Nakad. "URANS Modeling of Three Airfoils With Different Stall Mechanisms." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55023.

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Capability of recently developed Menter (ME) and Modified Menter (MME) one-equation models in predicting prestall and poststall characteristics of three airfoils that exhibit different stall onset mechanisms is investigated. The Spalart-Allmaras (SA) turbulence model is also included to form a baseline against which both the ME and the MME models are assessed. The effects of subiteration, grid size, and time stepping on the predictive accuracy of the numerical scheme are addressed. However, transition effect is not accounted for and hence, all test cases are run fully turbulent. Significant di

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Yu, Feiyan, and Savas Yavuzkurt. "Simulation of Film Cooling Heat Transfer and Simulation Improvement With a Modified DES Turbulence Model." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86887.

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Modeling the heat transfer characteristics of the highly turbulent flow in gas turbine film cooling is important for better engineering solutions to the film cooling system design. URANS, LES, DES and modified DES models capability in simulating film cooling with a density ratio of 2.0 and blowing ratio of 1.0 are studied in this work. Detailed comparisons of simulation results with experimental data regarding the near-field and far-fields are made. For near field predictions, DES gives decent prediction with a 21.4 % deviation of centerline effectiveness, while LES and URANS have deviation of

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Pedro, H. T. C., K. W. Leung, M. H. Kobayashi, and H. R. Riggs. "Numerical Study of the Wave Impact on a Square Column Using Large Eddy Simulation." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29729.

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This work concerns the numerical investigation of the impact of a wave on a square column. The wave is generated by a dam break in a wave tank. Two turbulence models were used: Large Eddy Simulations (LES) and Unsteady Reynolds Averaged Navier-Stokes (URANS). The numerical simulations were carried out using a finite volume approximation and the SIMPLE algorithm for the solution of the governing equations. Turbulence was modeled with the standard Smagorinsky-Lilly subgrid-model for the LES and the standard κ-ε model for the URANS. The results are validated against experimental data for the wave

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Burden, Shaun, John W. Chew, Feng Gao, and Olaf Marxen. "Effects of Turbine Conditions on Rim Seal Performance and Prediction." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-83194.

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Abstract Predicting the degree of hot gas ingestion into turbine disc cavities is a challenge for computational fluid dynamics due to the complex unsteady flow dynamics in turbine rim seals and sensitivity to operating condition and seal geometry. This paper reports research aimed at clarifying the effect of operating conditions on seal performance and turbulence modelling requirements. A systematic study of sealing performance for an axial rim seal is reported, comparing an unsteady Reynolds-averaged Navier-Stokes (URANS) model and wall-modelled large-eddy simulation (WMLES). The conditions c

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Ridluan, A., and A. Tokuhiro. "SRANS and URANS CFD Simulations of Turbulent VHTR Lower Plenum Flow." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42474.

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Time-dependent and time-independent CFD simulations of the flow through a staggered tube bundle were performed. This flow configuration partially simulates the anticipated flow in the lower plenum of a Very High Temperature Reactor (VHTR) design. To design a nuclear reactor with confidence, one needs strict benchmarking as part of a validation and verification exercise for any and all commercial CFD codes. Thus CFD simulations (FLUENT) of isothermal (at present), periodic flow through a tube bundle using both Steady Reynolds Averaged Navier-Stokes (SRANS) and Unsteady Reynolds Averaged Navier-

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Kok, Zhen, Yuting Jin, Shuhong Chai, Shaun Denehy, and Jonathan Duffy. "URANS Prediction of Berthed Ship–Passing Ship Interactions." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61738.

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In this paper, the unsteady Reynolds-Averaged Navier-Stokes computational method has been employed for investigating the hydrodynamic interactions between berthed and passing ships. Initially, simulations in model-scale were performed for validating the numerical modelling technique using available benchmark experimental test cases. A formal study of verification and validation was carried out for quantifying the numerical uncertainties. Based on the validated numerical setup, systematic computations were conducted for further investigations on the influence of varying passing ship speeds and

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