Bibliografías temáticas / EARSM

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Literatura académica sobre el tema "EARSM"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 15 de febrero de 2022

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Artículos de revistas sobre el tema "EARSM"

Kim, Yoo-Chul, Kwang-Soo Kim y Jin Kim. "Numerical Prediction of Ship Hydrodynamic Performances using Explicit Algebraic Reynolds Stress Turbulence Model". Journal of the Society of Naval Architects of Korea 51, n.º 1 (20 de febrero de 2014): 67–77. http://dx.doi.org/10.3744/snak.2014.51.1.67.

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Gomez, Carlos A. y Sharath S. Girimaji. "Explicit algebraic Reynolds stress model (EARSM) for compressible shear flows". Theoretical and Computational Fluid Dynamics 28, n.º 2 (24 de julio de 2013): 171–96. http://dx.doi.org/10.1007/s00162-013-0307-0.

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Bosnyakov, Igor Sergeevich, Vladimir Viktorovich Vlasenko, Andrey Viktorovich Wolkov, Sergey Vladimirovich Lyapunov y Aleksey Igorevich Troshin. "DISCONTINUOUS GALERKIN METHOD FOR THE REYNOLDS EQUATION SYSTEM WITH THE EARSM". TsAGI Science Journal 46, n.º 1 (2015): 1–16. http://dx.doi.org/10.1615/tsagiscij.2015013729.

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WALLIN, STEFAN y ARNE V. JOHANSSON. "An explicit algebraic Reynolds stress model for incompressible and compressible turbulent flows". Journal of Fluid Mechanics 403 (25 de enero de 2000): 89–132. http://dx.doi.org/10.1017/s0022112099007004.

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Some new developments of explicit algebraic Reynolds stress turbulence models (EARSM) are presented. The new developments include a new near-wall treatment ensuring realizability for the individual stress components, a formulation for compressible flows, and a suggestion for a possible approximation of diffusion terms in the anisotropy transport equation. Recent developments in this area are assessed and collected into a model for both incompressible and compressible three-dimensional wall-bounded turbulent flows. This model represents a solution of the implicit ARSM equations, where the production to dissipation ratio is obtained as a solution to a nonlinear algebraic relation. Three-dimensionality is fully accounted for in the mean flow description of the stress anisotropy. The resulting EARSM has been found to be well suited to integration to the wall and all individual Reynolds stresses can be well predicted by introducing wall damping functions derived from the van Driest damping function. The platform for the model consists of the transport equations for the kinetic energy and an auxiliary quantity. The proposed model can be used with any such platform, and examples are shown for two different choices of the auxiliary quantity.

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Holman, Jiří y Jiří Fürst. "Coupling the algebraic model of bypass transition with EARSM model of turbulence". Advances in Computational Mathematics 45, n.º 4 (26 de abril de 2019): 1977–92. http://dx.doi.org/10.1007/s10444-019-09680-2.

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Holman, Jiří. "Unsteady Flow past a Circular Cylinder Using Advanced Turbulence Models". Applied Mechanics and Materials 821 (enero de 2016): 23–30. http://dx.doi.org/10.4028/www.scientific.net/amm.821.23.

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This work deals with the numerical simulation of unsteady compressible turbulent flow past a circular cylinder. Turbulent flow is modeled by two different methods. The first method is based on the system of URANS equations closed by the two equation TNT model or modified EARSM model. Second method is based on the X-LES model, which is a hybrid RANS-LES method. Numerical solution is obtained by the finite volume method. Presented results are for the sub-critical turbulent flow characterized by Re=3900.

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Matesanz, A. y A. Velázquez. "EARSM finite element solver for the study of turbulent 3-D compressible separated flows". Computer Methods in Applied Mechanics and Engineering 190, n.º 8-10 (noviembre de 2000): 989–1004. http://dx.doi.org/10.1016/s0045-7825(99)00458-2.

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Běták, V., P. Sváček, J. Novotný, J. Fürst y J. Fořt. "On Application of EARSM Turbulence Model for Simulation of Flow Field behind Rack Station". EPJ Web of Conferences 45 (2013): 01013. http://dx.doi.org/10.1051/epjconf/20134501013.

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Louda, Petr, Petr Straka y Jaromír Příhoda. "Simulation of transonic flows through a turbine blade cascade with various prescription of outlet boundary conditions". EPJ Web of Conferences 180 (2018): 02056. http://dx.doi.org/10.1051/epjconf/201818002056.

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The contribution deals with the numerical simulation of transonic flows through a linear turbine blade cascade. Numerical simulations were carried partly for the standard computational domain with various outlet boundary conditions by the algebraic transition model of Straka and Příhoda [1] connected with the EARSM turbulence model of Hellsten [2] and partly for the computational domain corresponding to the geometrical arrangement in the wind tunnel by the γ-ζ transition model of Dick et al. [3] with the SST turbulence model. Numerical results were compared with experimental data. The agreement of numerical results with experimental results is acceptable through a complicated experimental configuration.

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Fořt, J., J. Dobeš, J. Fürst, J. Halama, K. Kozel, P. Louda y J. Příhoda. "Numerical Solution of Turbine Cascade Flow by Two Equations, EARSM and Bypass Transition Turbulence Models". PAMM 8, n.º 1 (diciembre de 2008): 10589–90. http://dx.doi.org/10.1002/pamm.200810589.

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Tesis sobre el tema "EARSM"

Grigoriev, Igor. "Turbulence modeling of compressible flows with large density variation". Doctoral thesis, KTH, Turbulens, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183452.

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In this study we highlight the influence of mean dilatation and mean density gradient on the Reynolds stress modeling of compressible, heat-releasing and supercritical turbulent flows.Firstly, the modeling of the rapid pressure-strain correlation has been extended to self-consistently account for the influence of mean dilatation.Secondly, an algebraic model for the turbulent density flux has been developed and coupled to the tensor equationfor Reynolds stress anisotropy via a 'local mean acceleration',a generalization of the buoyancy force. We applied the resulting differential Reynolds stress model (DRSM) and the corresponding explicit algebraic Reynolds stress model (EARSM) to homogeneously sheared and compressed or expanded two-dimensional mean flows. Both formulations have shown that our model preserves the realizability of the turbulence, meaning that the Reynolds stresses do not attain unphysical values, unlike earlier approaches. Comparison with rapid distortion theory (RDT) demonstrated that the DRSM captures the essentials of the transient behaviour of the diagonal anisotropies and gives good predictions of the turbulence kinetic energy. A general three-dimensional solution to the coupled EARSM has been formulated. In the case of turbulent flow in de Laval nozzle we investigated the influence of compressibility effects and demonstrated that the different calibrations lead to different turbulence regimes but with retained realizability. We calibrated our EARSM against a DNS of combustion in a wall-jet flow. Correct predictions of turbulent density fluxes have been achieved and essential features of the anisotropy behaviour have been captured.The proposed calibration keeps the model free of singularities for the cases studied. In addition, we have applied the EARSM to the investigation of supercritical carbon dioxide flow in an annulus. The model correctly captured mean enthalpy, temperature and density as well as the turbulence shear stress. Hence, we consider the model as a useful tool for the analysis of a wide range of compressible flows with large density variation.

QC 20160314

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Ferreira, Cláudia Alexandra Rocha. "Simulação de escoamentos fluviais com estruturas verticais nas margens do leito principal". Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8497.

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Vanpouille, David. "Développement de modèles de turbulence adaptés à la simulation des écoulements de convection naturelle à haut nombre de Rayleigh". Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0041/document.

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Un nouveau modèle de turbulence adapté aux écoulements turbulents soumis à laflottabilité a été développé en utilisant la configuration du canal plan vertical différentiellementchauffé comme référence. L’étude des DNS disponibles pour chacun des régimes de convection amontré les défauts des relations constitutives classiques conduisant à la mauvaise représentationdes écoulements de convection naturelle. Ces modèles ne prennent en compte ni le couplage deschamps thermique et dynamique ni l’anisotropie de l’écoulement, tout deux induits par la flottabilité.Une approche algébrique a donc été utilisées. L’hypothèse d’équilibre local a été validéedans une large partie du canal sauf dans la région de paroi et au voisinage d’un gradient devitesse nul, quel que soit le régime de convection. Les modèles homogènes et pariétaux pour lescorrélations de pression ont été étudiés et sélectionnés. Deux modèles EARSM et EAHFMprenant en compte les termes de flottabilité ont été développés. Ces modèles intègrent aussi destraitements spécifiques à la paroi reposant sur la pondération elliptique. Ils sont couplés à unmodèle corrigé pour mieux représenter le pic d’énergie cinétique turbulente prèsde la paroi. Le modèle complet a été confronté aux DNS sur la configuration du canal pourchacun des régimes de convection à travers des tests a priori et des calculs complets montrantdes résultats très encourageants et de meilleures prévisions que les modèles classiques
A new turbulence model dedicated to buoyant flows is developped using the differentiallyheated vertical plane channel flow configuration as test case. For each convection regime,the examination of available DNS databases pointed out the failure of classical modeling topredict buoyant flows. Neither the coupling between thermics and dynamics nor the anisotropy,both due to the buoyancy, are considered by these models. So, algebraic models are used. Theweak equilibrium assumption is validated in a large part of the channel except in the wall regionand close to zero velocity gradient whatever the convection regime. The wall and homogeneousmodels for the pressure terms are investigated and selected. Then, an EARSM and an EAHFMare developped to include the buoyant terms. These models both include wall treatments. Theyare coupled with a model modified to improve the representation of the turbulentkinetic energy maximum close to the wall. The complete model is finally compared to theDNS on the channel flow configuration for all convection regime thanks to a priori tests andcomplete computations, showing encouraging results and better predictions than classical models

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Eßer, Barbara. "EARS". Diss., lmu, 2004. http://nbn-resolving.de/urn:nbn:de:bvb:19-25979.

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Gordy, Clayton Jackson. "Ears on rears : transplantation of ears reveals afferent pathfinding properties". Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5939.

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Afferent neurons transmit information from both external and internal origin into the central nervous system (CNS). Sensory organs are connected at the periphery to these neurons, which in turn project into specific regions in the CNS. In sensory organs, such as the vertebrate ear, which receive auditory and vestibular stimuli, establishing precise connections with central targets is necessary for discrete, simultaneous, and efficient processing. However, it is not clear how afferents of the inner ear establish central projections with their target nuclei in the hindbrain. Transplantation of ears in Xenopus laevis offer a method through which the navigational properties of inner ear afferents can be experimentally tested. Specifically, grafting of ears to novel locations allow us to assess the pathfinding capabilities of afferents following ectopic placement. In transplanting ears adjacent to the spinal cord, we found that despite variable entry points along the dorsal-ventral axis, afferents projected dorsally, similar to projections of native ears in the hindbrain. Furthermore, these afferents were able to reach the hindbrain and project into vestibular nuclei. Late stage transplantations to the spinal cord revealed ear afferent fasciculation with afferents of the lateral line, indicating an alternative navigational route. Similarly, ventral transplantations to the heart region demonstrated ear afferent projection with the vagus nerve. These results collectively suggest that inner ear afferents are molecularly guided to reach their targets in the CNS once they are in proximity to it. However, they also display a capability to project along existing nerves both within the central and peripheral nervous systems. These results provide new information into how inner ear afferents navigate to connect with the CNS.

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Shahnaz, Navid. "Distinguishing otosclerotic ears from healthy ears using multifrequency and multicomponent tympanometry". Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=37837.

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The diagnostic utility of tympanometry with respect to distinguishing healthy and otosclerotic ears was investigated in four studies. This issue was examined with respect to alternative measures of static immittance (SI), tympanometric shape, resonant frequency (RF), and frequency corresponding to admittance phase angle of 45 degree (F45°) obtained from 68 healthy ears and 36 ears with surgically confirmed otosclerosis. Study 1 served to replicate previous findings that otosclerotic and healthy ears differ with respect to F45° and RF but not SI and TW measured at 226 Hz, thus confirming the advantage of multifrequency measures over standard low frequency tympanometric measures in differentiating healthy and otosclerotic ears. Studies 2 and 3 examined the effect of probe tone frequency on the diagnostic utility of SI and tympanometric shape. Group differences were evident for SI measured using a probe tone near the frequency corresponding to F45°, in the present study the optimal probe frequency was 630 Hz. Group differences were not evident for tympanometric width (TW) at 226 Hz, 350, and 450 Hz whereas the two groups differed in distribution of Vanhuyse patterns of 1B1G and 3B1G observed at frequencies between 800 Hz and 1250 Hz. In study 4 the diagnostic performance of five different tympanometric parameters was assessed using test performance and receiver operating characteristic (ROC) analysis. Results showed that F45° was the best single measure to distinguish healthy ears from otosclerotic ears; RF and SI measured at 630 Hz were the next best measures followed by Vanhuyse patterns; TW was the least useful measure. However, when compared using optimal decision criterion (derived from ROC analysis) differences in test performance for F45° and SI measured at 630 Hz were small suggesting that their clinical utility is comparable. Correlations and patterns of individual performance also confirm the presence of two independent signs of otoscle

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Jaishankar, Gayatri, Thomas M. Yohannan y Roger Smalligan. "Draining Ears, Dizzying Clot". Digital Commons @ East Tennessee State University, 2009. https://dc.etsu.edu/etsu-works/8876.

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Landers, Marion Rose. "Lost Lesotho princess/landlord ears". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/4130.

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This thesis is titled Lost Lesotho Princess/Landlord Ears. It consists of an original play of the same name based upon the life-story of the author’s paternal grandmother and an accompanying essay titled “Lost Lesotho Princess/Landlord Ears: Visibility, Invisibility, Roots and Liminality in the African Diaspora.” The play falls under the following theatrical categories: African Diaspora drama, black theatre, western Canadian black theatre, realism, the memory play and to some extent, contemporary existentialism. The essay is a discussion by the author regarding the dramatic, social and political context of the play. The following themes are highlighted: history — pertaining to a collective black history and individual histories and (her)stories, regarding and respecting ones’ elders as a link to history and Africa, and notions of commonality and difference within the African Diaspora with attention paid to myths and narratives about what it means to be ‘dark-skinned’ or ‘light-skinned’ in various black communities around the world. The methods of investigation were: a study of the drama and literature of the African Diaspora, the dramatic literature of other post-colonial societies and marginalized groups, one-on-one interviews with Rose Landers, whose experiences are represented by Carrie, the main character in Lost Lesotho Princess/Landlord Ears and field research at JazzArt - a dance-theatre company in Cape Town, South Africa. The view-point the play lends itself to and the conclusions drawn by the essay are: that black people and black communities need agency and healing, that being of mixed race does not have to equal psychological confusion and that mixed communities, families and cultures have been and will continue to be relevant to the universal black experience and the artistic representation of the African Diaspora. The importance of writing as a form of healing, resolution and revolution for members of the African Diaspora and the importance of authorship of ones’ own history is highlighted.

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Coffin, Allison Beth. "Unconventional myosins in fish ears". College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2445.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.
Thesis research directed by: Biology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Arndt, Kenneth G. "Sermon contextualization for postmodern ears". Theological Research Exchange Network (TREN), 2006. http://www.tren.com/search.cfm?p068-0610.

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Libros sobre el tema "EARSM"

Amoroso, Cynthia. Ears. New York, NY: Gareth Stevens Pub., 2010.

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Mathers, Douglas. Ears. [Mahwah, N.J.]: Troll Associates, 1992.

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Ballard, Carol. Ears. Chicago, Ill: Heinemann Library, 2003.

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Ferguson, Beth. Ears. Tarrytown, NY: Marshall Cavendish, 2004.

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James, Robert. Ears. Vero Beach, Fla: Rourke Press, 1995.

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Miller, Sara Swan. Ears. New York: Marshall Cavendish Benchmark, 2008.

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Ears. New York: Thomson Learning, 1995.

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Ballard, Carol. Ears. Chicago, Ill: Heinemann Library, 2003.

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Ears. New York: The Book Shop, 2010.

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B, Noyed Robert, ed. Ears. New York, NY: Gareth Stevens Pub., 2010.

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Capítulos de libros sobre el tema "EARSM"

Holman, Jiří y Jiřı́ Fürst. "Numerical Simulation of Compressible Turbulent Flows Using Modified EARSM Model". En Lecture Notes in Computational Science and Engineering, 677–87. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10705-9_67.

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Chen, Hsinchun, Daniel Zeng y Ping Yan. "EARS". En Integrated Series in Information Systems, 167–75. New York, NY: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-1278-7_12.

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van Haagen, A. J. Venker y J. E. Gajentaan. "Ears". En Medical History and Physical Examination in Companion Animals, 255–62. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0459-3_20.

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Naini, Farhad B. "The Ears". En Facial Aesthetics, 207–13. West Sussex, UK: John Wiley & Sons, Ltd., 2013. http://dx.doi.org/10.1002/9781118786567.ch13.

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Ketten, Darlene R. "Cetacean Ears". En Hearing by Whales and Dolphins, 43–108. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1150-1_2.

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Harbert, John C. "Your Ears". En Doctor in the House, 145–60. Totowa, NJ: Humana Press, 1994. http://dx.doi.org/10.1007/978-1-4757-5019-5_5.

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Neufeld, Christine M. "Introduction". En Avid Ears, 1–21. New York, NY: Routledge, 2019. |: Routledge, 2018. http://dx.doi.org/10.4324/9780429400131-1.

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Neufeld, Christine M. "The Philosopher and the Shrew". En Avid Ears, 22–52. New York, NY: Routledge, 2019. |: Routledge, 2018. http://dx.doi.org/10.4324/9780429400131-2.

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Neufeld, Christine M. "“Dame, Let Be Thy Din”". En Avid Ears, 53–84. New York, NY: Routledge, 2019. |: Routledge, 2018. http://dx.doi.org/10.4324/9780429400131-3.

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Neufeld, Christine M. "Gathering the Gossips". En Avid Ears, 85–114. New York, NY: Routledge, 2019. |: Routledge, 2018. http://dx.doi.org/10.4324/9780429400131-4.

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Actas de conferencias sobre el tema "EARSM"

Mehdizadeh, O. Z., L. Temmerman, B. Tartinville y Ch Hirsch. "Applications of EARSM Turbulence Models to Internal Flows". En ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68886.

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Turbulence modeling remains an active CFD development front for turbomachinery as well as for general industrial applications. While DNS and even LES still seem out of reach within the typical industrial design cycle due to their high computational cost, RANS-based models remain the workhorse of CFD. Currently, the most widely used models are Linear Eddy-Viscosity Models (LEVM), despite their known limitations for certain flow complexities. Therefore, extending the reliability of eddy-viscosity models to more complex flows without significantly increasing the computational cost can immediately contribute to more reliable CFD results for wider range of applications. This, in turn, can further reduce the need for costly tests and consequently can reduce the product development cost. A promising approach to achieve this goal is using Explicit Algebraic Reynolds Stress Models (EARSM), obtained through a simplification of the full Differential Reynolds Stress Models (DRSM), and can be perceived as an extension of LEVMs by including the non-linear relation between the turbulence stress tensor, the mean-flow gradient and the turbulence scales. These models are thus less demanding than DRSM, yet capable of capturing more complex turbulence features, compared to LEVM, such as anisotropy in the normal stresses. This may be particularly important in corner flows, for instance, in the hub-blade regions or in diffusers. This work explores the application of EARSM models to a double diffuser and a high-performance centrifugal compressor stage (HPCC). The results are compared to available experimental data [1,2] showing the importance of including the anisotropy of turbulence in the model, particularly in presence of turbulent corner flows in a diffuser. Furthermore, the EARSM results are also compared to results from the commonly used SST turbulence model. The CFD comparison includes details of the flow structure in the diffuser, where the most noticeable impact from the use of EARSM turbulence models is expected.

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Farisco, Federica, Stefan Rochhausen, Metin Korkmaz y Michael Schroll. "Validation of Flow Field and Heat Transfer in a Two-Pass Internal Cooling Channel Using Different Turbulence Models". En ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95461.

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In this work the flow regime within a generic turbine cooling system is investigated numerically. The main objective is to validate the performance of various turbulence models with different complexity by comparing the numerical results with experimental data. To maximize surface heat transfer rates, present-day cooling systems of high pressure turbines have highly complex shapes generating high turbulence levels and flow separations. These flow structures lead to higher requirements of CFD-techniques for sufficient prediction. To simulate complex flows in the industrial design process, Reynolds averaged Navier-Stokes (RANS) techniques are applied instead of computationally expensive LES and DNS simulations. Therefore, higher order turbulence models are necessary to predict flow field and heat transfer performance in such complex motion. The DLR standard flow solver for turbomachinery flows, TRACE, is used to solve the RANS equations. Four turbulence models have been analysed: the one equation model of Spalart and Allmaras, the two equation k – ω model of Wilcox, the two equation k – ω SST model of Menter and the anisotropy resolving Explicit Algebraic Reynolds Stress model (EARSM) of Hellsten. The investigated cooling geometry consists of a two-pass smooth channel with a 180 degree bend. At the DLR institute of propulsion technology PIV measurements in a rotating cooling channel test bed for Rotation numbers up to 0.1 have been performed. This work uses the experimental data for Re = 50,000 and Ro = 0 without rotation for comparison. For all models adiabatic and diabatic calculations have been performed. In order to accurately apply the turbulence models, a study concerning the turbulent boundary conditions has been performed prior to the calculations. The results obtained through RANS simulations are presented in comparison with the experiments along planes in the flow direction and in the orthogonal direction to study the velocity field, the shape and size of the separation bubbles and the wall shear stress. The EARSM predicts the flow field overall more accurately with improved agreement between all relevant parameters compared to the other models. The diabatic simulations reflect the adiabatic results. However, it can be noticed that higher complexity in turbulence modelling is related to increased heat transfer. Our work confirms the EARSMs ability to predict complex flow structures better than the more elementary approaches.

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Lorentzen, L. y I. Lindblad. "Application of two-equation and EARSM turbulence models to high lift aerodynamics". En 17th Applied Aerodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-3181.

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Holman, J. "NUMERICAL SOLUTION OF TRANSITIONAL FLOWS USING EARSM WITH ALGEBRAIC MODEL OF TRANSITION". En Topical Problems of Fluid Mechanics 2018. Institute of Thermomechanics, AS CR, v.v.i., 2018. http://dx.doi.org/10.14311/tpfm.2018.019.

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Casartelli, Ernesto, Luca Mangani, Armando Del Rio y Angelika Schmid. "Capturing S-Shape of Pump-Turbines by CFD Simulations Using an Anisotropic Turbulence Model". En ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5663.

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Abstract Pump-turbines cope very well with modern electricity-market demand, having high operational flexibility and storage capabilities. Nevertheless, dynamic operation of these machines can lead to very challenging transient conditions, depending on the shape of the characteristic. Mechanical integrity can be correspondingly affected. Therefore assessment of the characteristic during the design phase, i.e. before model testing, is of crucial importance. In the past years different attempts to accurately compute the characteristic under steady (i.e. fix point) and transient conditions have been undertaken using RANS CFD. While the SST turbulence model has become the reference for machine design, it often fails for conditions close to or around instabilities. Its strength to accurately predict separation close to sound conditions (i.e. mild part- and over-load) is no more helpful. Under unstable conditions, which are characterized by continuous unsteady vortex formation, turbulence isotropy as assumed by linear two equation models is no more the right choice. Accordingly a turbulence model able to capture anisotropy, EARSM (Explicit Algebraic Reynolds Stress Model), has been implemented in an in-house code and used for the computation of the characteristic of various machines, stable and unstable, in order to assess the model performance. In this paper computations of three different machines in turbine mode are presented. Results using steady boundary conditions (BC) in the unstable region as well as transient BC like load-rejection and runaway are computed with EARSM, showing its superiority compared to linear two equation models.

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Guilmineau, Emmanuel. "Numerical Simulation of Flow Around a Generic Pickup With ISIS-CFD". En ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30680.

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Computational Fluid Dynamics (CFD) is used to simulate the flow over a pickup truck. The flow solver used is ISIS-CFD developed by the CFD Department of the Fluid Mechanics Laboratory of Ecole Centrale de Nantes. CFD simulations are carried out with the Explicit Algebraic Reynolds Stress Model (EARSM) turbulence model and the Detached Eddy Simulation (DES). The focus of the simulation is to assess the capabilities of ISIS-CFD for vehicle aerodynamic development for pickup trucks. Detailed comparisons are made between the CFD simulations and the existing experiments for a generic pickup truck. The comparisons between the simulation results and the time-averaged measurements reveals that the CFD calculations are able to track the flow trends.

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Benzerdjeb, Abdelouahab, Mohammed K. Hamidou, Bouabdellah Abed, Mustapha Bordjane, Habib Achache y Alaxender M. Gorlov. "Numerical study on the performance of darrieus turbine by K-ε standard and K-ε EARSM turbulence models". En 2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 2017. http://dx.doi.org/10.1109/icrera.2017.8191117.

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Brakmann, Robin G., Robin Schöffler, Frank Kocian, Michael Schroll, Christian Willert, Martin Müller y Edmund Kügeler. "Quantitative Flow Imaging of Film Cooling Jets in a Cross-Flow Using Particle Image Velocimetry and Computational Fluid Dynamics". En ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-16141.

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Abstract The investigated generic configuration consists of cylindrical film cooling holes with a diameter of D = 8.4 mm and an inclination angle of α = 35°. The jets are characterized by a momentum flux ratio of I = 0.63, a density ratio of DR = 0.94 and a cross-flow Reynolds number of Re = 5500. Stereoscopic PIV allows creating a (pseudo) three dimensional image of the flow field. High resolution PIV is used to evaluate velocity fluctuations. The numerical model uses the SST and an EARSM turbulence model. The turbulent scalar fluxes are computed by a constant turbulent Prandtl number as well as algebraic models for the turbulent heat flux. The presented results consist of field cuts and line profiles of the velocity, vorticity and turbulent kinetic energy. All considered numerical options can predict the velocity field accurately, the SST turbulence model is the numerically most stable model and has the lowest demands in computational costs.

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Lange, Martin, Matthias Rolfes, Ronald Mailach y Henner Schrapp. "Periodic Unsteady Tip Clearance Vortex Development in a Low Speed Axial Research Compressor at Different Tip Clearances". En ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64256.

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Since the early work on axial compressors the penalties due to radial clearances between blades and side walls are known and an ongoing focus of research work. The periodic unsteadiness of the tip clearance vortex, due to its interaction with the stator wakes, has only rarely been addressed in research papers so far. The current work presents experimental and numerical results from a four stage low speed research compressor modeling a state of the art compressor design. Time-resolved experimental measurements have been carried out at three different rotor tip clearances (gap to tip chord: 1.5%, 2.2%, 3.7%) to cover the third rotor’s casing static pressure and exit flow field. These results are compared with either steady simulations using different turbulence models or harmonic RANS calculations to discuss the periodical unsteady tip clearance vortex development at different clearance heights. The prediction of the local tip leakage flow is clearly improved by the EARSM turbulence model compared to the standard SST model. The harmonic RANS calculations (using the SST model) improve the prediction of time-averaged pressure rise and are used to analyze the rotor stator interaction in detail. The interaction of the rotor tip flow field with the passing stator wakes cause a segmentation of the tip clearance vortex and result in a sinusoidal variation in blockage downstream the rotor row.

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Gooding, William J., Matthew A. Meier y Nicole L. Key. "The Impact of Various Modelling Decisions on Flow Field Predictions in a Centrifugal Compressor". En ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14516.

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Abstract Computational tools have become increasingly important in design and research applications in recent years due to increasing computational resources. In most cases, model geometry and flow-physics are simplified to reduce the complexity of the computational model. While this was necessary historically, modern computational tools are capable of including realistic features such as fillets, surface roughness, and heat transfer. This work presents extensive and systematic numerical results from a simulation of a centrifugal compressor stage for an aero-engine application. Numerical results are compared to detailed experimental data to investigate the effect of various modelling decisions, including turbulence models, on the predicted aerodynamics developing through the diffuser passage. Roughness and the inclusion of fillets significantly impact the flow development, especially with the SST turbulence model. This approach leads to the conclusion that the BSL-EARSM model is best able to predict the experimentally determined diffuser flow profiles and overall performance trends with the inclusion of the previously mentioned model features. Additionally, the misleading conclusions can be reached if modelling decisions are based on merely matching overall performance values. Finally, frozen rotor simulations are used to roughly approximate the impact of unsteadiness on the flow field. The results show a significant impact and also that the inclusion of approximate unsteady effects tends to further improve the predictive capability of the computational models that were considered.

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Informes sobre el tema "EARSM"

Pritchard, Joy, H. R. Whay y A. Brown. Head/ears lesions. Brooke, 2011. http://dx.doi.org/10.46746/gaw.2020.abi.les.hde.

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Xin, Hao. Human Ears Inspired Passive Microwave Direction Finding. Fort Belvoir, VA: Defense Technical Information Center, enero de 2009. http://dx.doi.org/10.21236/ada516464.

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Jones, Karen. High frequency acoustic reflexes in cochlea-impaired and normal ears. Portland State University Library, enero de 2000. http://dx.doi.org/10.15760/etd.5979.

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Vanden Berg, Michael, Andrew Rupke y Stephanie Mills. Resource Overview for the Original 2016 Bears Ears National Monument Designation and Vicinity. Utah Geological Survey, marzo de 2021. http://dx.doi.org/10.34191/pi-102.

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Park, Sungsu. Final Technical Report for Collaborative Research: CRI-EaSM Multiscale Modeling Aerosol Indirect Effects on Decadal Timescales. Office of Scientific and Technical Information (OSTI), noviembre de 2015. http://dx.doi.org/10.2172/1227159.

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Daniels, Mark D. The Armored Cavalry Regiment in the 1990s: Time to Restore the Eyes and Ears of the Corps Commander. Fort Belvoir, VA: Defense Technical Information Center, junio de 1990. http://dx.doi.org/10.21236/ada236484.

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Inquiring ears want to know: a fact sheet about your hearing test. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, noviembre de 2007. http://dx.doi.org/10.26616/nioshpub2008102.

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They're your ears: protect them. Hearing loss caused by farm noise is preventable. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, noviembre de 2007. http://dx.doi.org/10.26616/nioshpub2007175.

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