Thematische Bibliographien / Modèle URANS

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Auswahl der wissenschaftlichen Literatur zum Thema „Modèle URANS“

Autor: Grafiati

Veröffentlicht am 7. Juli 2024

Zuletzt aktualisiert am 31. Juli 2025

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Zeitschriftenartikel zum Thema "Modèle URANS"

Maïzi, Mohamed, Rabah Dizène, and Ouahiba Guerri. "Simulation instationnaire de l’écoulement autour d’un rotor éolien à axe horizontal." Journal of Renewable Energies 15, no. 4 (2023): 599–608. http://dx.doi.org/10.54966/jreen.v15i4.349.

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Les pales d’une éolienne sont soumises à des chargements aérodynamiques, génèrent des écoulements extrêmement complexes. Nous nous intéressons à la dynamique des écoulements autour des pales d’éolienne à axe horizontal en rotation. Ce papier présente une méthode de simulation numérique pour la prédiction de l’écoulement autour d’une éolienne à axe horizontal opérant en régime instationnaire, tridimensionnel turbulent utilisant l’approche basée sur les équations de Navier-Stokes moyennées (URANS) en utilisant le code ‘CFX’.Un maillage structuré a été adopté en utilisant la technique des interfa

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Stalewski, Wieńczysław, and Katarzyna Surmacz. "Helicopter Flight Simulation based on URANS Solver and Virtual Blade Model." Journal of KONES 26, no. 3 (2019): 211–17. http://dx.doi.org/10.2478/kones-2019-0075.

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Abstract The methodology of simulation of a rotorcraft flight has been developed and applied to simulate several stages of flight of light helicopter. The methodology is based on coupling of several computational models of Computational Fluid Dynamics, Flight Dynamic. The essence of the methodology consists in calculation of aerodynamic forces acting on the flying rotorcraft by solving during the simulation the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations. In this approach, the rotorcraft is flying inside the computational 3D mesh modelling the space filled with the air. The flig

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Castellani, Francesco, Abdelgalil Eltayesh, Francesco Natili, et al. "Wind Flow Characterisation over a PV Module through URANS Simulations and Wind Tunnel Optical Flow Methods." Energies 14, no. 20 (2021): 6546. http://dx.doi.org/10.3390/en14206546.

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Despite their simplicity, photovoltaic (PV) modules are often arranged in structures that can be affected by severe and complex wind loads: in this context, the wind flow and the dynamic excitation induced by vortex shedding can introduce unexpected aeroelastic responses. This work introduces a novel wind tunnel application of experimental techniques to address this issue by the use of flow visualisation and video postprocessing, through the optical flow algorithm. Numerical simulations based on unsteady Reynolds-averaged Navier–Stokes (RANS) models are performed and compared against the exper

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Mitrofanov, S. V., D. K. Baykasenov, and A. U. Nemaltsev. "Operational experience of a Solar Power Plant with a Dual-Axis Solar Tracking System in the conditions of the Southern Urals." E3S Web of Conferences 124 (2019): 01022. http://dx.doi.org/10.1051/e3sconf/201912401022.

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The paper substantiates the need for the introduction of solar tracking systems for photovoltaic plants and presents a brief review of the scientific and technical literature on the development of solar trackers. Principal scheme of a heliostation with a dual-axis solar tracker of Orenburg State University has been designed. A comparative analysis of the generated electricity by a statically located solar module and a solar module with the dual-axis solar tracker is represented. Data for analysis have been obtained in Orenburg (Russia) using the developed automated system for remote diagnostic

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Paktovskiy, Yu G., and A. G. Popov. "Devonian diamond reservoir of the Urals." LITHOSPHERE (Russia) 23, no. 4 (2023): 683–700. http://dx.doi.org/10.24930/1681-9004-2023-23-4-683-700.

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Research subject. The Takata formation of the Emsian tier of the Lower Devonian (D1tk) in the Urals is a reservoir of Devonian diamonds. Aim. Confirmation and determination of the diamond-bearing conditions of the reservoir. Materials and Methods. Generalization of primary and interpreted geological information. Lithofacial analysis. Historical and geological reconstruction. Cartographic analysis and geological and cartographic modeling in the ArcMapESRY GIS environment using the ModelBuilder module. Results. The Takata formation is part of the Emsian tier of the Lower Devonian. Tectonically,

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Diartika, Eka Imbia Agus. "Efektivitas Modul Pencemaran Sampah dengan Model Argument-Driven Inquiry (ADI) untuk Meningkatkan Keterampilan Berpikir Kritis Mahasiswa Biologi." Indo-MathEdu Intellectuals Journal 5, no. 2 (2024): 2090–102. http://dx.doi.org/10.54373/imeij.v5i2.983.

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Critical thinking skills are a crucial aspect of the 21st century, playing a fundamental role in various areas of life, yet they are still not optimally developed in classrooms. This research aims to develop critical thinking skills through the Argument Driven Inquiry (ADI) module for biology students. This study uses a nonrandomized control-group pretest-posttest design experiment involving three classes as the experimental group, positive control, and negative control. This research sample consisted of 67 biology students from Universitas Negeri Malang across three classes. Data collection t

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Rodríguez Sánchez, Maria A., Anna Collado Gimbert, Sara Reidel, et al. "uRADAR: European Patients Referral Frame to Improve Access to New Drugs and Therapies in Ultra-Rare Anemia Disorders and Severe Hereditary Spherocytosis." Blood 144, Supplement 1 (2024): 794. https://doi.org/10.1182/blood-2024-201501.

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Background: Ultra-rare anemia disorders (uRADs) are commonly neglected from health planning and clinical research hampering its timely diagnosis and leading to sub-optimal clinical management and very few treatment options. The Rare Anemia Disorders European Epidemiological Platform (RADeep) together with the ERN-EuroBloodNet have joint efforts to establish the uRADAR initiative aiming to develop a referral frame for patients affected by uRADs in the European Union. The uRADAR ultimate goal is to enable access to clinical trials (CT), including drug repurposing i.e. ERN-EuroBloodNet SATISFY Ph

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Zavyalov, D. A., and L. Yu Krestinina. "Analysis of the Incidence of Solid Malignant Neoplasms in the Urals Cohort of Exposed Population Offspring." MEDICAL RADIOLOGY AND RADIATION SAFETY 69, no. 6 (2024): 51–55. https://doi.org/10.33266/1024-6177-2024-69-6-51-55.

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Purpose: The study of regularities in the incidence of solid cancer in the Urals Cohort of the Exposed Population Offspring over a 65-year follow-up period. Material and methods: The study was conducted by cohort method. The cohort under study is the Urals Cohort of the Exposed Population Offspring. It includes offspring of the population exposed in the period from 1950 to 1960 in the Southern Urals (on the Techa River and at the East Urals radioactive trace). The catchment area includes 5 districts of the Chelyabinsk region, as well as the city of Chelyabinsk and the city of Ozyorsk. The foll

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Maslennikova, Anna V., Valerii N. Udachin, Vladimir V. Deryagin, and Mikhail V. Shtenberg. "Reconstruction of Turgoyak lake (the Southern Urals) ecosystem changes in holocene." LITOSFERA, no. 6 (December 28, 2018): 914–27. http://dx.doi.org/10.24930/1681-9004-2018-18-6-914-927.

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Object. Multi-proxy analysis of 265 cm long sediments core of Lake Turgoyak, one of the deepest lakes of the Southern Urals, is presented. Materials and methods. The lake ecosystem changes was reconstructed based on diatom, radiocarbon dating and geochemical analysis. Statistical treatment of the surface sediments composition and hydrochemistry data of 56 lakes from Southern and Middle Urals lakes database allowed to obtain geochemical indexes for reconstruction of water parameters: index of organic matter content (ОМ = LOI550ºС/(Al2O3 + TiO2 + Na2O + K2O)) and index of salinity (ММ = LOI950ºC

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Bugała, Pamela, Janusz Sznajder, and Adam Sieradzki. "Numerical Modelling of Static Aeroelastic Deformations of Slender Wing in Aerodynamic Design." Transactions on Aerospace Research 2023, no. 4 (2023): 52–70. http://dx.doi.org/10.2478/tar-2023-0023.

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Abstract The article presents the validation of two methods for analyzing the aerodynamic properties of the aircraft wing concerning aeroelastic effects. The first method is based on low-cost computational models (Euler–Bernoulli Beam Model and Vortex Lattice Method [VLM]). Its primary objective is to estimate the wing’s deformation early in the design stages and during the automatic optimization process. The second one is a method that uses solutions of unsteady Navier–Stokes equations (URANS). This method suits early design, particularly for unconventional designs or flight conditions exceed

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Dissertationen zum Thema "Modèle URANS"

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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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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Fadai-Ghotbi, Atabak. "Modélisation de la turbulence en situation instationnaire par approches URANS et hybride RANS-LES : prise en compte des effets de paroi par pondération elliptique." Phd thesis, Université de Poitiers, 2007. http://tel.archives-ouvertes.fr/tel-00163592.

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L'objectif de ce travail est de prendre en compte les instationnarités naturelles à grande échelle dans les écoulements décollés et à un coût plus faible que la LES, tout en s'intéressant à la modélisation des effets de paroi par des modèles statistiques au second ordre. S'inspirant des approches de Durbin, le modèle à pondération elliptique EB-RSM reproduit l'effet non-local de blocage, en résolvant une équation différentielle sur le terme de pression. La limite à deux composantes de la turbulence est bien prédite en canal. Ce modèle est appliqué à la marche descendante, dans une approche URA

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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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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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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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Benyoucef, Farid. "Amélioration de la prévision des écoulements turbulents par une approche URANS avancée." Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0014/document.

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Ces travaux de recherche ont pour but d’évaluer la méthode dite de la "Simulation auxEchelles Adaptées" (SAS pour Scale-Adaptive Simulation). Cette approche coïncide avec uneapproche RANS classique dans les zones pariétales attachées et adapte le niveau de viscositéturbulente dans les zones décollées pour y permettre une résolution partielle des structures turbulentes.Dans une première partie, une analyse théorique du modèle SAS original a été menéeet a permis de développer une correction visant à favoriser l’adaptation du niveau de viscositéturbulente dans les zones sièges d’instabilités de t

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Thiery, Mylène. "Modélisation numérique du tremblement sur profil d'aile supercritique." Toulouse, ENSAE, 2005. http://www.theses.fr/2005ESAE0022.

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Cette thèse est consacrée à la modélisation numérique de l'oscillation de choc sur un proﬁl d’aile supercritique, en liaison avec la prévision du phénomène de tremblement. L'étude s’appuie sur la base de données expérimentale générée par l'ONERA, à la soufflerie S3 de Chalais Meudon, sur le proﬁl OAT15A. La démarche est de modéliser progressivement les contraintes géométriques de la veine d’essais pour assurer une évaluation objective des modèles de turbulence de type RSAM, à l’aide du logiciel eIsA. Elle débute par l’étude d’une conﬁguration simple, sans oscillation de choc, en utilisant une

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Ammour, Dalila. "Highly resolved LES and tests of the effectiveness of different URANS models for the computation of challenging natural convection cases." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/highly-resolved-les-and-tests-of-the-effectiveness-of-different-urans-models-for-the-computation-of-challenging-natural-convection-cases(bc3e7813-b1b0-4d5b-9f27-4e50180dff59).html.

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In the present thesis turbulent natural convection of air within different challenging test cases are investigated numerically by means of an unstructured finite volume code, Code_Saturne. First, flow within both two-dimensional vertical and inclined differentially heated rectangular cavities at 60° and 15° to the horizontal for an aspect ratio of H/L=28.6 and Rayleigh number of 0.86×10e6 is computed using several high and low-Re models. Here the effectiveness of the RANS models in Code_Saturne is assessed through comparisons with a range of available experimental data. After some tests of the

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Bücher zum Thema "Modèle URANS"

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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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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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 "Modèle URANS"

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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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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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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PODOLAK, M., W. B. HUBBARD, and D. J. STEVENSON. "MODELS OF URANUS’ INTERIOR AND MAGNETIC FIELD." In Uranus. University of Arizona Press, 1991. http://dx.doi.org/10.2307/j.ctv1v7zdtq.6.

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"Analytic Urns." In Polya Urn Models. Chapman and Hall/CRC, 2008. http://dx.doi.org/10.1201/9781420059847-11.

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"Analytic Urns." In Polya Urn Models. Chapman and Hall/CRC, 2008. http://dx.doi.org/10.1201/9781420059847.ch7.

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"URANOS." In Designing for Human-Machine Symbiosis Using the URANOS Model. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1888-4.ch002.

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This chapter presents a generic system model called URANOS, that allows to design complex human-centered systems. It is not aligned to any particular discipline. Rather, it helps to build integral systems in different domains of science and engineering, even though it was originally intended to participate in the design of complex human-centered systems in the framework of ICT. URANOS aims at encouraging interdisciplinary work and reinforces the understanding of complex systems in general. It combines different epistemological standpoints and their corresponding realities into a wholeness. Con

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Ingersoll, Andrew P. "Uranus, Neptune, and Exoplanets." In Planetary Climates. Princeton University Press, 2013. http://dx.doi.org/10.23943/princeton/9780691145044.003.0010.

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This chapter focuses on the climates of Uranus, Neptune, and exoplanets. Uranus spins on its side, which allows a comparison between sunlight and rotation for their effects on weather patterns. In contrast to Venus, Uranus is only weakly affcted by tides from the Sun because it is so far away. Models of planet accretion give a gradual clumping of small bodies into medium-sized bodies and then into large bodies, until finally only a few large bodies are left. The final collisions, which involved these large bodies, would have been quite violent and were capable of knocking Uranus on its side. A

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"Urns Evolving by Multiple Drawing." In Polya Urn Models. Chapman and Hall/CRC, 2008. http://dx.doi.org/10.1201/9781420059847-14.

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Konferenzberichte zum Thema "Modèle URANS"

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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Smith, Luke, Marilyn Smith, Andrew Lind, Anya Jones, and Kevin Jacobson. "Experimental and Computational Investigation of a Linearly Pitching NACA 0012 in Reverse Flow." In Vertical Flight Society 72nd Annual Forum & Technology Display. The Vertical Flight Society, 2016. http://dx.doi.org/10.4050/f-0072-2016-11390.

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The reverse flow region of a high advance ratio rotor is modeled using a linearly pitching semi-infinite NACA 0012 blade section in a constant reverse flow freestream. A coupled experimental-numerical approach is used to investigate the instantaneous and ensemble-averaged unsteady aerodynamics. Two pitch cases were considered: 0° ≤ αrev ≤ 20° (i.e., high pitch) and 5° ≤ αrev ≤ 15° (i.e., low pitch). Transient flow phenomena were characterized experimentally using time-resolved particle image velocimetry and unsteady pressure measurements. In the high pitch case, the measured velocity field was

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Jain, Rohit, Arnaud Pape, Marilyn Smith, Michel Costes, and Francois Richez. "High-resolution CFD Predictions for Static and Dynamic Stall of a Finite-span OA209 Wing." In Vertical Flight Society 72nd Annual Forum & Technology Display. The Vertical Flight Society, 2016. http://dx.doi.org/10.4050/f-0072-2016-11371.

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High-resolution computational fluid dynamics (CFD) simulations were performed using Unsteady Reynolds-averaged Navier-Stokes (URANS) and Delayed Detached Eddy Simulation (DDES) models for the static and dynamic stall of a finite-span OA209 wing. The flow was modeled as both fully turbulent and laminar with transition to turbulence. NASA OVERFLOW and ONERA elsA flow solvers were used for the simulations. A comprehensive, comparative study was carried out between the predictions and the ONERA finite-wing test data for pre- and post-stall measurements that included blade section loads, surface pr

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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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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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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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Israel, Daniel. "URANS and VLES: Using Conventional RANS Models for Time Dependent Flows." In 36th AIAA Fluid Dynamics Conference and Exhibit. American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-3908.

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Tangermann, Eike, and Michael Pfitzner. "Numerical Investigation of Flame Flashback Into Swirling Flow." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51081.

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A lean premixed swirl burner configuration has been investigated numerically regarding its vulnerability with respect to flame flashback caused by combustion induced vortex breakdown (CIVB). The flashback phenomenon has been simulated using a simplified quasi two-dimensional URANS method to cover a large range of operational conditions and using Large-Eddy-Simulation to achieve a detailed view of the processes involved. The Lindsted-Vaos turbulent premixed combustion model supplemented with quenching models has been used in URANS simulations. In the LES the combustion has been modeled with a t

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Gopalan, Harish, Dominic Denver John Chandar, Narasimha Rao Pillamarri, et al. "Numerical Investigation of Flow Interference Effects in Fixed and Vibrating Tandem Square Columns Using Hybrid RANS-LES Models." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41659.

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Investigation of flow past tandem and side-by-side circular and square columns is of interest in offshore engineering. Flow past fixed and vibrating circular columns has received a lot of focus in the literature. However, the studies focused on square columns, especially at high Reynolds numbers are very limited due to the computational cost of large eddy simulation (LES). Unsteady Reynolds-averaged Navier-Stokes (URANS) methods are limited by their accuracy, especially for tandem columns in the wake interference regime (spacing to diameter ratio: L=D ∼ 3:0). Hybrid URANS-LES models (URANS nea

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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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