Academic literature on the topic 'Stator simulations'

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Journal articles on the topic "Stator simulations"

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Reinmo¨ller, U., B. Stephan, S. Schmidt, and R. Niehuis. "Clocking Effects in a 1.5 Stage Axial Turbine—Steady and Unsteady Experimental Investigations Supported by Numerical Simulations." Journal of Turbomachinery 124, no. 1 (2001): 52–60. http://dx.doi.org/10.1115/1.1425811.

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The interaction between rotor and stator airfoils in a multistage turbomachine causes an inherently unsteady flow field. In addition, different relative circumferential positions of several stator rows and rotor rows, respectively, have an influence on the flow behavior in terms of loss generation, energy transport and secondary flow. The objective of the presented study is to investigate the effects of stator airfoil clocking on the performance of a 1-1/2 stage axial cold air turbine. The investigated axial turbine consists of two identical stators. The low aspect ratio of the blades and thei
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Tomasello, Stella Grazia, Roberto Meloni, Luca Andrei, and Antonio Andreini. "Study of Combustor–Turbine Interactions by Performing Coupled and Decoupled Hybrid RANS-LES Simulations under Representative Engine-like Conditions." Energies 16, no. 14 (2023): 5395. http://dx.doi.org/10.3390/en16145395.

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Combustion–turbine interaction phenomena are attracting ever-growing interest in recent years. As a matter of fact, the strong unsteady and three-dimensional flow field that characterizes the combustor is usually conserved up to the first-stage nozzle, possibly affecting its design and performance in terms of aerodynamics and the effectiveness of the cooling system as well. Such conditions are also exacerbated by the employment of lean-burn combustors, where high turbulence levels are required for the flame stabilization, resulting in even greater temperature and velocity distortions at the in
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Jiang, Yongjiang, Kejie Wang, Lingkang Zhou, Wenfeng Zhang, and Zhen Hu. "Characteristics Improvement of Brushless Doubly-Fed Wind Turbine Generator with Minimized Asymmetric Phenomena." Electronics 14, no. 8 (2025): 1649. https://doi.org/10.3390/electronics14081649.

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Compared with the traditional brushless doubly-fed generator (BDFG), the BDFG with double stator (BDFG-DS) architecture achieves enhanced configurability by physically decoupling the power and control windings onto independent stator assemblies. The design offers benefits such as expanded slot dimensions and enhanced power density, yet it remains constrained by inherent asymmetry in three phases, which causes large harmonics and torque ripples. In this paper, the working mechanism of the BDFG-DS is introduced. Then the root cause of the asymmetric phenomena is discussed. And based on the analy
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Wang, Ziwei, Xiong Jiang, Ti Chen, Yan Hao, and Min Qiu. "Numerical simulation of transonic compressor under circumferential inlet distortion and rotor/stator interference using harmonic balance method." Modern Physics Letters B 32, no. 12n13 (2018): 1840021. http://dx.doi.org/10.1142/s0217984918400213.

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Simulating the unsteady flow of compressor under circumferential inlet distortion and rotor/stator interference would need full-annulus grid with a dual time method. This process is time consuming and needs a large amount of computational resources. Harmonic balance method simulates the unsteady flow in compressor on single passage grid with a series of steady simulations. This will largely increase the computational efficiency in comparison with the dual time method. However, most simulations with harmonic balance method are conducted on the flow under either circumferential inlet distortion
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Akwa, J. V., and A. P. Petry. "STATORS USE INFLUENCE ON THE PERFORMANCE OF A SAVONIUS WIND ROTOR USING COMPUTATIONAL FLUID DYNAMICS." Revista de Engenharia Térmica 10, no. 1-2 (2011): 63. http://dx.doi.org/10.5380/reterm.v10i1-2.61965.

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This paper aims at verifying the influence of using five kinds of stators in the averaged moment and power coefficients of a Savonius wind rotor using computational fluid dynamics (CFD). The analyzed stators have cylindrical shape with two and three openings, one and four deflector blades and walls shaped like a wings. The equations of continuity, Reynolds Averaged Navier-Stokes – RANS and the Eddy Viscosity Model k-ω SST, in its Low-Reynolds approaches, with hybrid near wall treatment; are numerically solved using the commercial software Star-CCM+, based on Finite Volume Method, resulting in
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Tang, Jing, Jie Chen, Kan Dong, Yongheng Yang, Haichen Lv, and Zhigang Liu. "Modeling and Evaluation of Stator and Rotor Faults for Induction Motors." Energies 13, no. 1 (2019): 133. http://dx.doi.org/10.3390/en13010133.

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The modeling of stator and rotor faults is the basis of the development of online monitoring techniques. To obtain reliable stator and rotor fault models, this paper focuses on dynamic modeling of the stator and rotor faults in real-time, which adopts a multiple-coupled-circuit method by using a winding function approach for inductance calculation. Firstly, the model of the induction machine with a healthy cage is introduced, where a rotor mesh that consists of a few rotor loops and an end ring loop is considered. Then, the stator inter-turn fault model is presented by adding an extra branch w
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Karanayil, Baburaj, Muhammed Fazlur Rahman, and Colin Grantham. "Identification of Induction Motor Parameters in Industrial Drives with Artificial Neural Networks." Advances in Fuzzy Systems 2009 (2009): 1–10. http://dx.doi.org/10.1155/2009/241809.

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This paper presents a new method of online estimation of the stator and rotor resistance of the induction motor in the indirect vector-controlled drive, with artificial neural networks. The back propagation algorithm is used for training of the neural networks. The error between the rotor flux linkages based on a neural network model and a voltage model is back propagated to adjust the weights of the neural network model for the rotor resistance estimation. For the stator resistance estimation, the error between the measured stator current and the estimated stator current using neural network
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Rai, M. M., and N. K. Madavan. "Multi-Airfoil Navier–Stokes Simulations of Turbine Rotor–Stator Interaction." Journal of Turbomachinery 112, no. 3 (1990): 377–84. http://dx.doi.org/10.1115/1.2927670.

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An accurate numerical analysis of the flows associated with rotor–stator configurations in turbomachinery can be extremely helpful in optimizing the performance of turbomachinery. In this study the unsteady, thin-layer, Navier–Stokes equations in two spatial dimensions are solved on a system of patched and overlaid grids for an axial-turbine rotor–stator configuration. The governing equations are solved using a finite-difference, upwind algorithm that is set in an iterative, implicit framework. Results are presented in the form of pressure contours, time-averaged pressures, unsteady pressures,
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Hembera, M., H. P. Kau, and E. Johann. "Simulation of Casing Treatments of a Transonic Compressor Stage." International Journal of Rotating Machinery 2008 (2008): 1–10. http://dx.doi.org/10.1155/2008/657202.

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This article presents the study of casing treatments on an axial compressor stage for improving stability and enhancing stall margin. So far, many simulations of casing treatments on single rotor or rotor-stator configurations were performed. But as the application of casing treatments in engines will be in a multistage compressor, in this study, the axial slots are applied to a typical transonic first stage of a high-pressure 4.5-stage compressor including an upstream IGV, rotor, and stator. The unsteady simulations are performed with a three-dimensional time accurate Favre-averaged Navier-st
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Xu, Jieqiong, Qunhong Li, and Shimin Wang. "Impulsive Control of the Rotor-Stator Rub Based on Phase Characteristic." Abstract and Applied Analysis 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/495747.

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An impulsive control method is proposed to eliminate the rotor-stator rubbing based on the phase characteristic. The relation between the vibration energy and the phase difference suggests the starting point for controlling the rotor-stator rubbing by implementing impulse. When the contact between the rotor and the stator occurs, the impulse is implemented inx-direction andy-direction several times to avoid the rotor-stator rubbing. The practical feasibility of this approach is investigated by numerical simulations.
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Dissertations / Theses on the topic "Stator simulations"

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JACQUES, REMI. "Simulations numeriques d'ecoulements transitionnels et turbulents dans des configurations de type rotor-stator." Paris 11, 1997. http://www.theses.fr/1997PA112386.

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Ce travail de these porte sur l'etude numerique des ecoulements transitionnels et turbulents dans une cavite confinee formee de deux disques coaxiaux dont l'un est en rotation uniforme autour de son axe de revolution (rotor), et l'autre stationnaire (stator). Les simulations numeriques sont effectuees sous l'hypothese d'axisymetrie de l'ecoulement instantane. On utilise alors un code de calcul parallelise integrant une decomposition de domaine. Plusieurs caracteristiques des ecoulements entre deux disques tournants sont reproduites : existence de couches limites sur les deux disques tournants,
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Schreiber, Johannes. "Investigation of experimental and numerical methods, and analysis of stator clocking and instabilities in a high-speed multistage compressor." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC063/document.

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Les études expérimentales et numériques suivantes visent à la compréhension profonde de l’écoulement se développant dans le compresseur haute-vitesse axial de 3.5 étages CREATE, étudié sur un banc d’essai de 2 MW au Laboratoire de Mécanique des Fluides et Acoustique (LMFA) à Lyon, France. Ce travail a trois objectifs principaux : D’abord, une description globale de l’écoulement avec une identification des limites aux méthodes d’exploration utilisées ; Ensuite, la caractérisation de l’effet du clocking stator-stator dans un compresseur à haute-vitesse ; Troisièmement, l’identification des insta
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D'Haudt, Emmanuel. "Étude expérimentale de l'influence des conditions périphériques sur un écoulement turbulent de type rotor-stator : premières confrontations avec des résultats de simulations numériques." Lille 1, 2006. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2006/50376-2006-D_Haudt.pdf.

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Les recherches effectuées sur des écoulements turbulents dans des cavités interdisques ont permis de mettre en évidence l'importance des conditions aux limites. Ce présent travail a pour but de mieux comprendre les phénomènes qui régissent l'apparition de différents types d'écoulements observés dans une cavité rotor-stator non soumise à un flux radial forcé. Dans cette optique, un banc d'essais a été adapté pour étudier plus spécifiquement l'influence de deux paramètres géométriques, l'un lié à une faible différence entre le rayon des disques, l'autre relatif à la présence d'un carter permetta
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D'Haudt, Emmanuel Bois Gérard Debuchy Roger. "Étude expérimentale de l'influence des conditions périphériques sur un écoulement turbulent de type rotor-stator premières confrontations avec des résultats de simulations numériques /." Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/988.

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Reproduction de : Thèse de doctorat : Mécanique : Lille 1 : 2006.<br>N° d'ordre (Lille 1) :3874. Résumé en français et en anglais. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 171-173.
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Peres, Noele. "A 3D pseudospectral method for cylindrical coordinates. Application to the simulations of rotating cavity flows." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4309/document.

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La simulation d'écoulements dans des cavités cylindriques en rotation présente une difficulté particulière en raison de l'apparition de singularités sur l'axe. Le présent travail propose une méthode collocative pseudospectrale suffisamment efficace et précise pour surmonter cette difficulté et résoudre les équations 3D de Navier-Stokes écrites en coordonnées cylindriques. Cette méthode a été développée dans le cadre des différentes études menées au laboratoire M2P2, utilisant une méthode collocative de type Chebychev dans les directions radiale et axiale et Fourier-Galerkin dans la direction a
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Millithaler, Pierre. "Dynamic behaviour of electric machine stators : modelling guidelines for efficient finite-element simulations and design specifications for noise reduction." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2003/document.

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Dopées par un intérêt croissant des industries telles que l’automobile, les technologies demotorisation100% électriques équipent de plus en plus de véhicules à la portée du grand public. Endépit d’une opinion commune favorable sur les faibles émissions sonores des moteurs électriques,la maîtrise des performances vibratoires et acoustiques d’une telle machine reste un challenge trèscoûteux à relever. Associant l’expertise de l’entreprise Vibrate cet du département MécaniqueAppliquée de l’institut Femto-ST, cette thèse CIFRE vise à améliorer les connaissances actuellessur le comportement mécaniq
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Sauvage, Bastien. "Approximation et adaptation numériques pour les écoulements en machines tournantes." Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5045.

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Ce travail s'inscrit dans un projet de recherche dont l'objectif est de proposer des simulations numériques en fluides (CFD) capables de capturer le bruit produit par les machines tournantes.Cette thèse, au sein de ce projet, à pour objectif d'étudier des méthodes d'adaptation de maillages (instationnaires) pour des écoulements turbulents instationnaires.On commence par décrire les outils nécessaires à nos études, à savoir les méthodes numériques, les modèles de turbulences et l'adaptation de maillages. Une première partie est consacrée à l'étude de l'algorithme d'adaptation de maillage instat
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Jung, Alexander. "Berechnung der Stator-Rotor-Wechselwirkung in Turbomaschinen." [S.l. : s.n.], 2000. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8862171.

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Bridel-Bertomeu, Thibault. "Investigation of unsteady phenomena in rotor/stator cavities using Large Eddy Simulation." Thesis, Toulouse, INPT, 2016. http://oatao.univ-toulouse.fr/17867/1/BRIDEL_BERTOMEU.pdf.

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This thesis provides a numerical and theoretical investigation of transitional and turbulent enclosed rotating flows, with a focus on the formation of macroscopic coherent flow structures. The underlying processes are strongly threedimensional due to the presence of boundary layers on the discs and on the walls of the outer (resp. inner) cylindrical shroud (resp. shaft). The complexity of these flows poses a great challenge in fundamental research however the present work is also of importance for industrial rotating machinery, from hard-drives to space engines turbopumps - the design issues o
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Emmanuelli, Ariane. "Numerical simulation and modelling of entropy noise in nozzle and turbine stator flows." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC067.

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L'étude du bruit de combustion est motivée par l'augmentation de sa contribution relative au bruit émis par les moteurs aéronautiques actuels, ainsi que par son impact sur la conception de chambres de combustion à basse émission de NOx. Le bruit entropique est une source de bruit de combustion indirect générée par l'accélération de perturbations entropiques à travers les tuyères et les étages de turbine à l'aval de la chambre de combustion. Cette étude porte sur la simulation numérique et la modélisation du bruit entropique à travers une tuyère et un stator de turbine. Dans un premier temps, l
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Books on the topic "Stator simulations"

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Center, Ames Research, ed. Three-dimensional Navier-Stokes simulations of turbine rotor-stator interaction. National Aeronautics and Space Administration, Ames Research Center, 1988.

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Center, Ames Research, ed. Three-dimensional Navier-Stokes simulations of turbine rotor-stator interaction. National Aeronautics and Space Administration, Ames Research Center, 1988.

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Boretti, A. A. Three-dimensional Euler time accurate simulations of fan rotor-stator interactions. National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1990.

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Boretti, A. A. Three-dimensional Euler time accurate simulations of fan rotor-stator interactions. Lewis Research Centre, 1990.

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Lewis Research Center. Institute for Computational Mechanics in Propulsion., ed. Three-dimensional Euler time accurate simulations of fan rotor-stator interactions. National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1990.

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Boretti, A. A. Three-dimensional Euler time accurate simulations of fan rotor-stator interactions. National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1990.

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Federico, Cecconi, ed. La società dei beni: Dalla famiglia allo Stato alle imprese private. Bollati Boringhieri, 2006.

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United States. Army Test and Evaluation Command, ed. TECOM, modeling & simulation. U.S. Army Test and Evaluation Command, 1994.

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Center, Ames Research, ed. Gas-Grain Simulation Facility. NASA Ames Research Center, 1993.

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Center, Ames Research, ed. Gas-Grain Simulation Facility. NASA Ames Research Center, 1993.

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Book chapters on the topic "Stator simulations"

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Neuhauser, Magdalena, Francis Leboeuf, Jean-Christophe Marongiu, Etienne Parkinson, and Daniel Robb. "Simulations of Rotor–Stator Interactions with SPH-ALE." In Advances in Hydroinformatics. Springer Singapore, 2013. http://dx.doi.org/10.1007/978-981-4451-42-0_29.

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Song, An, Xiang Luo, Zhongliang He, and Jian He. "Numerical Investigation on Flow and Heat Transfer of a Rotor–Stator Cavity with Labyrinth Seal." In Computational and Experimental Simulations in Engineering. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-42515-8_56.

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Giangaspero, G., M. Almquist, K. Mattsson, and E. van der Weide. "Unsteady Simulations of Rotor Stator Interactions Using SBP-SAT Schemes: Status and Challenges." In Lecture Notes in Computational Science and Engineering. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19800-2_21.

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Feng, Wenzong, Qing Zhang, Zhuoxiang Chen, Jianqun Zhang, and Haoyu Wang. "Dynamical Simulation Analysis of Faulty Gearbox in Quay Crane Under Dynamic Load." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_15.

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AbstractDynamics simulations with faults can elucidate fault vibration characteristics, yet the vibrational properties of the quay crane lifting gearboxes under dynamic load excitation remain unclear. Based on multi-body dynamics theory, a multi-body dynamical model of the quay crane gearbox is established, simulating dynamic load excitation caused by cables and containers during the operation of a quay crane. The vibration responses under various working conditions and load types of different gear states are analyzed, and the corresponding fault frequency features are extracted by envelope sp
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Wang, Rui, Tong Zhu, Chuang Zhou, and Jian-Min Zhang. "LEAP-ASIA-2019 Simulations at Tsinghua University." In Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading II. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-48821-4_19.

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AbstractThis chapter presents the constitutive model calibration and numerical simulations of centrifuge shaking table tests for LEAP-ASIA-2019, at Tsinghua University. A plasticity model that can provide unified description for the behavior sand at different states under both monotonic and cyclic loading, with focus on the large post-liquefaction shear deformation, is calibrated and used in this study. New undrained cyclic torsional shear test results for Ottawa F65 sand provided in the most recent phase of the LEAP project are used in the calibration process. Typical results for acceleration
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Serre, Eric, Patrick Bontoux, and Brian Launder. "Studies of Transitional and Turbulent Flows in Rotor-Stator Cavity Using High-Performance Computations." In Direct and Large-Eddy Simulation V. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2313-2_22.

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Qi, Jianhui. "Multi-objective Optimisation for Supercritical CO$$_2$$ Radial Inflow Turbine Stator." In Simulation Tools and Methods for Supercritical Carbon Dioxide Radial Inflow Turbine. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2860-4_7.

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Theorell, Axel, and Jörg Stelling. "Microbial Community Decision Making Models in Batch and Chemostat Cultures." In Computational Methods in Systems Biology. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85633-5_9.

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AbstractMicrobial community simulations using genome scale metabolic networks (GSMs) are relevant for many application areas, such as the analysis of the human microbiome. Such simulations rely on assumptions about the culturing environment, affecting if the culture may reach a metabolically stationary state with constant microbial concentrations. They also require assumptions on decision making by the microbes: metabolic strategies can be in the interest of individual community members or of the whole community. However, the impact of such common assumptions on community simulation results ha
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Verma, Amar Kumar, P. Spandana, S. V. Padmanabhan, and Sudha Radhika. "Quantitative Modeling and Simulation for Stator Inter-turn Fault Detection in Industrial Machine." In Intelligent Computing and Communication. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1084-7_10.

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Shahangian, Navid, Leila Sharifian, Rüdiger Beykirch, Albert Jeckel, Silja Klier, and Lothar Grupe. "Simulation of Oil Flow Behavior in the Air Gap between Rotor and Stator." In Proceedings. Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-42940-9_6.

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Conference papers on the topic "Stator simulations"

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Stummann, Simon, Daniel Pohl, Peter Jeschke, Hannes Wolf, Alexander Halcoussis, and Matthias Franke. "Secondary Flow in Variable Stator Vanes With Penny-Cavities." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63771.

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This paper presents a description of Detached Eddy Simulations being carried out on a variable stator vane with a penny-cavity in order to determine the secondary flow phenomena in the main flowpath. Variable stator vanes are common in multi-stage compressors to prevent flow separations on rotor and stator blades at off-design operation points. The bearing of the stators at hub and tip generate unavoidable circular-shaped ring gaps, which are called penny-cavities. The aim of this paper is to determine secondary flow phenomena in variable stator vanes on an annular cascade testbed resulting fr
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Feng, Dakui, Hang Zhang, Yue Sun, Qing Wang, and Xiaofei Hu. "Studies About Design of Rear Stator of Ducted Propeller Using CFD." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96020.

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Abstract Ducted propeller designs are becoming more popular because of their high efficiency, resistance to cavitation and low radiated noise. In this paper, unsteady RANS simulations are carried out for the design of rear stators for ducted propeller to improve its hydrodynamic performance. The design of rear stator is carried out based on the wake field behind propellers. The two-dimensional airfoil modified from NACA4603 is studied to obtain the angle of attack that makes thrust on stators maximum. The analyses are performed at different angles of attack, using commercial computational flui
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Graf, Martin B., and Om P. Sharma. "Effects of Downstream Stator Pressure Field on Upstream Rotor Performance." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-507.

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Results of numerical simulations conducted for a high pressure compressor rotor with two different levels of tip clearance are presented. A three-dimensional, steady, Reynolds-Averaged Navier-Stokes code was utilized to perform the computations. The simulations were executed over a range of flow coefficients by specifying different axisymmetric radial profiles in static pressure downstream of the rotor. In this manner, the effect of the downstream stator row was approximated using a simple, circumferentially averaged, radial pressure profile as the boundary condition behind the rotor. The back
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Galpin, Paul, Thorsten Hansen, Georg Scheuerer, et al. "Validation of Transonic Axial Compressor Stage Unsteady-State Rotor-Stator Simulations." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64786.

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The paper describes the validation of steady-state and unsteady CFD simulations against experimental data from a single-stage, transonic axial compressor stage. The experimental data include overall compressor performance, high-resolution traverses of total pressure and total temperature, and unsteady-state total pressure measurements downstream of the rotor. Various numerical rotor-stator interaction methods were applied across the operational speedline. These included a steady-state method mixing plane, and a transient time inclination method that accounts for the unsteady rotor to stator pi
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RAI, MAN, and NATERI MADAVAN. "Multi-airfoil Navier-Stokes simulations of turbine rotor-stator interaction." In 26th Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-361.

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Zhou, Haowei, Pengcheng Du, and Fangfei Ning. "Time step criteria for rotor-stator unsteady simulations of turbomachinery." In GPPS Chania24. GPPS, 2024. http://dx.doi.org/10.33737/gpps24-tc-065.

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With the rapid improvement of computing power, unsteady Reynolds-Averaged Navier-Stokes (U-RANS) solvers are increasingly used to get a deeper comprehension of the rotor-stator unsteady flows inside turbomachinery. The dual-time stepping method is adopted in most U-RANS solvers and the determination of the optimal size of physical time step is a crucial procedure for rotor-stator U-RANS simulations, and it is the primary purpose of this paper. The criteria for determining the size of physical time step for rotor-stator interactions with and without filtering mixing plane were proposed through
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Blaszczak, Jaroslaw R. "Efficiency Improvement and Noise Reduction Through Stator-Stator Clocking Effect of a Two-Stage Turbine." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68833.

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The objective of the presented test program was to further experimentally investigate vane-indexing effect influence on the performance, noise and vibration of two-stage low-pressure turbine. Keeping the inlet conditions strictly constant during the tests, two turbine stages were experimentally investigated. Herein, some flow measurement results and the external characteristics for different circumferential positions of the stator vanes are described. Comparisons were made with numerical simulation and they showed good agreement. Experimental data and numerical simulations of stator vane surfa
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Reinmöller, U., B. Stephan, S. Schmidt, and R. Niehuis. "Clocking Effects in a 1.5 Stage Axial Turbine: Steady and Unsteady Experimental Investigations Supported by Numerical Simulations." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0304.

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The interaction between rotor and stator airfoils in a multistage turbomachine causes an inherently unsteady flow field. In addition, different relative circumferential positions of several stator rows and rotor rows, respectively, have an influence on the flow behaviour in terms of loss generation, energy transport and secondary flow. The objective of the presented study is to investigate the effects of stator airfoil clocking on the performance of an 1-1/2 stage axial cold air turbine. The investigated axial turbine consists of two identical stators. The low aspect ratio of the blades and th
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Sato, Masanori, Takashi Nagumo, Kazuyuki Toda, and Makoto Yamamoto. "Computation of Rotor/Stator Interaction With Hydrogen-Fuelled Combustion." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45618.

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For the next-generation aircraft, a new propulsion system using hydrogen fuel has been proposed. In the present system, hydrogen fuel injected from a stator surface combusts in the turbine passages, accordingly, the conventional combustor can be cut out. The advantage of this system is that we can design a lighter and smaller engine with low emission. We have demonstrated the realizability of this system by using the cycle analysis and the numerical simulations. Through the previous studies, it was confirmed that the rotor/stator interaction has to be investigated, because the hydrogen combust
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Dorney, D. J., D. L. Sondak, P. G. A. Cizmas, V. E. Saren, and N. M. Savin. "Full-Annulus Simulations of Airfoil Clocking in a 1-1/2 Stage Axial Compressor." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-023.

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Axial compressors have inherently unsteady flow fields because of relative motion between rotor and stator airfoils. This relative motion leads to viscous and inviscid (potential) interactions between blade rows. As the number of stages increases in a turbomachine, the buildup of convected wakes can lead to progressively more complex wake/wake and wake/airfoil interactions. Variations in the relative circumferential positions of stators or rotors can change these interactions, leading to different unsteady forcing functions on airfoils and different compressor efficiencies. In addition, as the
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Reports on the topic "Stator simulations"

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Zhu, Minjie, and Michael Scott. Two-Dimensional Debris-Fluid-Structure Interaction with the Particle Finite Element Method. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2024. http://dx.doi.org/10.55461/gsfh8371.

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In addition to tsunami wave loading, tsunami-driven debris can cause significant damage to coastal infrastructure and critical bridge lifelines. Using numerical simulations to predict loads imparted by debris on structures is necessary to supplement the limited number of physical experiments of in-water debris loading. To supplement SPH-FEM (Smoothed Particle Hydrodynamics-Finite Element Method) simulations described in a companion PEER report, fluid-structure-debris simulations using the Particle Finite Element Method (PFEM) show the debris modeling capabilities in OpenSees. A new contact ele
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Allen, Luke, Robert Haehnel, and Yonghu Wenren. South Pole Station snowdrift model. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/44943.

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The elevated building at Scott-Amundsen South Pole Station was designed to mitigate the effects of windblown snow on it and the surrounding infrastructure. Because the elevation of the snow surface increases annually, the station is periodically lifted on its support columns to maintain its design height above the snow surface. To assist with planning these lifts, this effort developed a computational model to simulate snowdrift formation around the elevated building. The model uses computational fluid dynamics methods and synthetic wind record generation derived from statistical analysis of m
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Murray, Trevor, and Timothy Jacobs. PR-457-16200-R01 Control of Vented Methane Emissions from Integral Compressor Engines. Pipeline Research Council International, Inc. (PRCI), 2018. http://dx.doi.org/10.55274/r0011475.

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At natural gas pipeline compressor stations, methane emissions from compressor and engine crankcases are often vented directly into the atmosphere. There may be advantages to capturing these emissions and using them to offset fuel usage and / or decrease the overall carbon footprint of such a typical compressor station. This study evaluates the feasibility of directing such captured emissions into the intake of the compressor engine and subsequently combusting the methane emissions into carbon dioxide and water. Although seemingly an obvious or trivial solution, there are in fact several chall
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Johnston, Morgan, Kiara Pazan, Yan Ding, Mary Allison, and Sung-Chan Kim. Surge analysis in Mobile Harbor, Alabama : ship-simulation report. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/47596.

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A navigation channel improvement study for Mobile Harbor was conducted by the US Army Corps of Engineers, Mobile District (CESAM), and the Alabama State Port Authority. The US Army Engineer Research and Development Center (ERDC) assisted CESAM in assessing channel modifications using ERDC’s Ship/Tow Simulator through a Feasibility Level Screening Simulation study in 2017 and through a more comprehensive ship-simulation study in 2020. During the 2020 study, a safety concern was identified related to vessel interactions between a transiting vessel passing docked vessels at the McDuffie Coal Term
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Grenade, Kari, Allan Wright, and Ankie Scott-Joseph. Fiscal Rules: Towards a New Paradigm for Fiscal Sustainability in Small States. Inter-American Development Bank, 2017. http://dx.doi.org/10.18235/0011783.

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This study contends that Caribbean countries cannot adequately surmount their fiscal and debt challenges in the absence of binding rules that are geared toward entrenching fiscal discipline, curbing fiscal procyclicality, and improving budget transparency and credibility. Distilling global lessons and taking due cognizance of Caribbean countries' idiosyncrasies, the paper explores key technical, operational and institutional issues in the design, implementation, and monitoring of fiscal rules that might be relevant for Caribbean countries that currently do not have legislated rules. Results fr
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Farhi, Edward, and Hartmut Neven. Classification with Quantum Neural Networks on Near Term Processors. Web of Open Science, 2020. http://dx.doi.org/10.37686/qrl.v1i2.80.

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We introduce a quantum neural network, QNN, that can represent labeled data, classical or quantum, and be trained by supervised learning. The quantum circuit consists of a sequence of parameter dependent unitary transformations which acts on an input quantum state. For binary classification a single Pauli operator is measured on a designated readout qubit. The measured output is the quantum neural network’s predictor of the binary label of the input state. We show through classical simulation that parameters can be found that allow the QNN to learn to correctly distinguish the two data sets. W
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Henager, Charles H., Fei Gao, Shenyang Y. Hu, Guang Lin, Eric J. Bylaska, and Nicholas Zabaras. Simulating Interface Growth and Defect Generation in CZT – Simulation State of the Art and Known Gaps. Office of Scientific and Technical Information (OSTI), 2012. http://dx.doi.org/10.2172/1118122.

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Murphy, Richard D. Work Station for Particle Simulations of Plasmas. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada299086.

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de Melo Kort-Kamp, Wilton Junior, Diego Alejandro Roberto Dalvit, Sinhara Rishi Malinda Silva, and Jeremiah Joseph Rushton. Modeling and Simulation of Static Metasurfaces. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1493539.

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Rambo, P. W., and J. Denavit. Monte Carlo simulations of solid-state photoswitches. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/123236.

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