Relevant bibliographies by topics / Solveur RANS non structuré

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  2. Dissertations / Theses
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Academic literature on the topic 'Solveur RANS non structuré'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Solveur RANS non structuré"

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Li, Qiuwei, Zhihui Zhu, and Gongguo Tang. "The non-convex geometry of low-rank matrix optimization." Information and Inference: A Journal of the IMA 8, no. 1 (2018): 51–96. http://dx.doi.org/10.1093/imaiai/iay003.

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Abstract This work considers two popular minimization problems: (i) the minimization of a general convex function f(X) with the domain being positive semi-definite matrices, and (ii) the minimization of a general convex function f(X) regularized by the matrix nuclear norm $\|X\|_{*}$ with the domain being general matrices. Despite their optimal statistical performance in the literature, these two optimization problems have a high computational complexity even when solved using tailored fast convex solvers. To develop faster and more scalable algorithms, we follow the proposal of Burer and Mont
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Khoromskaia, Venera, and Boris N. Khoromskij. "Block Circulant and Toeplitz Structures in the Linearized Hartree–Fock Equation on Finite Lattices: Tensor Approach." Computational Methods in Applied Mathematics 17, no. 3 (2017): 431–55. http://dx.doi.org/10.1515/cmam-2017-0004.

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AbstractThis paper introduces and analyzes the new grid-based tensor approach to approximate solutions of the elliptic eigenvalue problem for the 3D lattice-structured systems. We consider the linearized Hartree–Fock equation over a spatial{L_{1}\times L_{2}\times L_{3}}lattice for both periodic and non-periodic problem setting, discretized in the localized Gaussian-type orbitals basis. In the periodic case, the Galerkin system matrix obeys a three-level block-circulant structure that allows the FFT-based diagonalization, while for the finite extended systems in a box (Dirichlet boundary condi
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Rathje, H., T. E. Schellin, and A. Brehm. "Speed loss in waves and wave-induced torsion of a wide-breadth containership." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 225, no. 4 (2011): 387–401. http://dx.doi.org/10.1177/1475090211412681.

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Aspects relevant for operational and structural design of a wide-breadth, neo-panmax containership were addressed. First, speed loss in waves was investigated. Second, wave-induced global hull girder torsion was determined to assess the effects of the increased breadth on this load component, generally considered critical for the ship’s structural strength. An extended Reynolds-averaged Navier–Stokes (RANS) equations solver simulated the ship advancing in calm water as well as in selected regular head and bow waves. A boundary element method (BEM) computed transfer functions of wave-induced sh
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Zhang, Landan, Lingbing Peng, Tianfang Zhang, Siying Cao, and Zhenming Peng. "Infrared Small Target Detection via Non-Convex Rank Approximation Minimization Joint l2,1 Norm." Remote Sensing 10, no. 11 (2018): 1821. http://dx.doi.org/10.3390/rs10111821.

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To improve the detection ability of infrared small targets in complex backgrounds, a novel method based on non-convex rank approximation minimization joint l2,1 norm (NRAM) was proposed. Due to the defects of the nuclear norm and l1 norm, the state-of-the-art infrared image-patch (IPI) model usually leaves background residuals in the target image. To fix this problem, a non-convex, tighter rank surrogate and weighted l1 norm are instead utilized, which can suppress the background better while preserving the target efficiently. Considering that many state-of-the-art methods are still unable to
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Hadipour, A., K. A. V. Abadi, H. Khanzadi, and H. Motahari. "Hydrodynamic Analysis of Noise Propagation By the High Skew Marine Propeller Working in Non-Uniform Inflow." International Journal of Applied Mechanics and Engineering 26, no. 1 (2021): 104–21. http://dx.doi.org/10.2478/ijame-2021-0007.

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Abstract Being able to predict ship and marine propulsion noise is an important issue for naval architectures and the international maritime community. The main objective of this paper is the numerical investigation on the noise propagation by the high skew marine propeller working in a non-uniform inflow via RANS solver in the broadband frequency range. The pressure fluctuations were monitored at three points on the propeller blade, then by using the FFT operator we computed the blade passing frequency (BPF) for different propeller loading conditions. Based on these pressure pulses and adopti
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Guan, Xuewei, Landan Zhang, Suqi Huang, and Zhenming Peng. "Infrared Small Target Detection via Non-Convex Tensor Rank Surrogate Joint Local Contrast Energy." Remote Sensing 12, no. 9 (2020): 1520. http://dx.doi.org/10.3390/rs12091520.

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Small target detection is a crucial technique that restricts the performance of many infrared imaging systems. In this paper, a novel detection model of infrared small target via non-convex tensor rank surrogate joint local contrast energy (NTRS) is proposed. To improve the latest infrared patch-tensor (IPT) model, a non-convex tensor rank surrogate merging tensor nuclear norm (TNN) and the Laplace function, is utilized for low rank background patch-tensor constraint, which has a useful property of adaptively allocating weight for every singular value and can better approximate l 0 -norm. Cons
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Xu, Zhixuan, Caikou Chen, Guojiang Han, and Jun Gao. "Robust subspace clustering based on latent low rank representation with non-negative sparse Laplacian constraints." Journal of Intelligent & Fuzzy Systems 40, no. 6 (2021): 12151–65. http://dx.doi.org/10.3233/jifs-210274.

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As a successful improvement on Low Rank Representation (LRR), Latent Low Rank Representation (LatLRR) has been one of the state-of-the-art models for subspace clustering due to the capability of discovering the low dimensional subspace structures of data, especially when the data samples are insufficient and/or extremely corrupted. However, the LatLRR method does not consider the nonlinear geometric structures within data, which leads to the loss of the locality information among data in the learning phase. Moreover, the coefficients of the learnt representation matrix can be negative, which l
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Bates, Paul D., Martin J. Siegert, Victoria Lee, Bryn P. Hubbard, and Peter W. Nienow. "Numerical simulation of three-dimensional velocity fields in pressurized and non-pressurized Nye channels." Annals of Glaciology 37 (2003): 281–85. http://dx.doi.org/10.3189/172756403781815609.

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AbstractChannels incised into bedrock, or Nye channels, often form an important component of subglacial drainage at temperate glaciers, and their structure exerts control over patterns and rates of (a) channel erosion, (b) water flow-velocity and (c) water pressure. The latter, in turn, exerts a strong control over basal traction and, thus, ice dynamics. In order to investigate these controls, it is necessary to quantify detailed flow processes in subglacial Nye channels. However, it is effectively impossible to acquire such measurements from fully pressurized, subglacial channels. To solve th
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Hou, Elizabeth, Earl Lawrence, and Alfred O. Hero. "Penalized ensemble Kalman filters for high dimensional non-linear systems." PLOS ONE 16, no. 3 (2021): e0248046. http://dx.doi.org/10.1371/journal.pone.0248046.

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The ensemble Kalman filter (EnKF) is a data assimilation technique that uses an ensemble of models, updated with data, to track the time evolution of a usually non-linear system. It does so by using an empirical approximation to the well-known Kalman filter. However, its performance can suffer when the ensemble size is smaller than the state space, as is often necessary for computationally burdensome models. This scenario means that the empirical estimate of the state covariance is not full rank and possibly quite noisy. To solve this problem in this high dimensional regime, we propose a compu
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Zheng, Ruiqing, Min Li, Zhenlan Liang, Fang-Xiang Wu, Yi Pan, and Jianxin Wang. "SinNLRR: a robust subspace clustering method for cell type detection by non-negative and low-rank representation." Bioinformatics 35, no. 19 (2019): 3642–50. http://dx.doi.org/10.1093/bioinformatics/btz139.

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Abstract Motivation The development of single-cell RNA-sequencing (scRNA-seq) provides a new perspective to study biological problems at the single-cell level. One of the key issues in scRNA-seq analysis is to resolve the heterogeneity and diversity of cells, which is to cluster the cells into several groups. However, many existing clustering methods are designed to analyze bulk RNA-seq data, it is urgent to develop the new scRNA-seq clustering methods. Moreover, the high noise in scRNA-seq data also brings a lot of challenges to computational methods. Results In this study, we propose a novel
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Dissertations / Theses on the topic "Solveur RANS non structuré"

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Patel, Alpesh K. "Développement d'un solveur RANS adaptatif sur maillages non-structurés hexaédriques." Doctoral thesis, Universite Libre de Bruxelles, 2003. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211338.

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Gross, Raphaël. "Prise en compte de la transition laminaire / turbulent dans un code Navier-Stokes éléments finis non structurés." Thesis, Toulouse, ISAE, 2015. http://www.theses.fr/2015ESAE0022/document.

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La thèse vise à intégrer des critères de transition dans le solveur Navier-Stokes non structuré Aether utilisé chez Dassault Aviation. Une méthodologie de prévision de la transition laminaire/turbulent a été élaborée et implémentée dans le solveur RANS Aether. Deux stratégies de calcul de transition ont été testées. Soit Aether est couplé avec le code de couche limite de l’ONERA 3C3D. Soit la position de transition est calculée en utilisant directement les profils de vitesse RANS. Les deux méthodes ont été testées pour des écoulements subsoniques et transsoniques. L’influence des solveurs numé
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Guignery, Florent. "Mécanismes microphysiques intervenant dans le sillage proche d'un avion en maillage non structuré." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0113/document.

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La présente étude porte sur la simulation numérique de la croissance des cristaux de glace dans le sillage proche d'une aile rectangulaire munie de deux injecteurs qui modélisent les deux moteurs. Dans cette configuration, les phénomènes microphysiques interviennent lors de l'interaction du jet, issu du moteur, et du tourbillon marginal qui se développe à chaque bout d'aile. Cet écoulement, très turbulent, perturbe fortement l'air environnant. Les jets diffusent dans l'atmosphère et s'enroulent autour des deux tourbillons de bout d'aile. Ces jets contiennent de la vapeur d'eau, des suies, des
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Paxion, Sébastien. "Développement d'un solveur multigrille non-structuré parallèle pour la simulation de flammes laminaires en chimie et transport complexes." Châtenay-Malabry, Ecole centrale de Paris, 1999. http://www.theses.fr/1999ECAP0681.

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A ce jour, les simulations précises d'écoulements réactifs complexes restent difficiles à réaliser et très couteuses. Cependant, leurs enjeux actuels sont d'une telle importance scientifique, économique et écologique, qu'il y a aujourd'hui un réel besoin d'outils prédictifs rapides, complémentaires des études expérimentales. Ce travail a consisté à développer un code de simulation de flammes laminaires stationnaires en milieu gazeux, pour des faibles nombres de mach. Des modèles détaillés sont pris en compte pour décrire les mécanismes réactionnels, les propriétés thermodynamiques du mélange g
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Marta, Garcia. "Développement et validation du formalisme Euler-Lagrange dans un solveur parallèle et non-structuré pour la simulation aux grandes échelles." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2009. http://tel.archives-ouvertes.fr/tel-00414067.

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De nombreuses applications industrielles mettent en jeu des écoulements gaz-particules, comme les turbines aéronautiques et les réacteurs à lit fluidifié de l'industrie chimique. La prédiction des propriétés de la phase dispersée, est essentielle à l'amélioration et la conception des dispositifs conformément aux nouvelles normes européennes des émissions polluantes. L'objectif de cette thèse est de développer le formalisme Euler-Lagrange dans un solveur parallèle et non-structure pour la simulation aux grandes échelles pour ce type d'écoulements. Ce travail est motivé par l'augmentation rapide
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Moussaed, Carine. "Modèles variationnels dynamique et hybride pour la simulation numérique d'écoulements turbulents." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20130/document.

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Ce travail est une contribution à la simulation numérique d'écoulements turbulents dans un but d'application industrielle. Nous nous intéressons dans un premier temps à une nouvelle combinaison "VMS-LES/procédure dynamique" pour la simulation d'écoulements autour de cylindres circulaire et carré. L'approche VMS-LES mise en œuvre a pour originalité d'utiliser une procédure de moyennage sur des volumes finis agglomérés dans le but de séparer les échelles, l'approche dynamique étant celle introduite par Germano en LES. Une approche hybride RANS/VMS-LES est ensuite évaluée sur le problème du cylin
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Montagnier, Julien. "Etude de schémas numériques d'ordre élevé pour la simulation de dispersion de polluants dans des géométries complexes." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00502476.

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La prévention des risques industriels nécessite de simuler la dispersion turbulente de polluants. Cependant, les outils majoritairement utilisés à ce jour ne permettent pas de traiter les champs proches dans le cas de géométries complexes, et il est nécessaire d'utiliser les outils de CFD (“ Computational Fluid Dynamics ”) plus adaptés, mais plus coûteux. Afin de simuler les écoulements atmosphériques avec dispersion de polluants, les modèles CFD doivent modéliser correctement d'une part, les effets de flottabilité, et d'autre part les effets de la turbulence. Plusieurs approches existent, not
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Books on the topic "Solveur RANS non structuré"

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Meurig Thomas, John. Architects of Structural Biology. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198854500.001.0001.

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Designed for the non-specialist, the explanations and illustrations used here describe the work, personalities, collaborations, and idiosyncrasies of four of the most distinguished Nobel Laureates of the twentieth century. They exploited a discovery made over a century ago about the nature of X-rays, and thereby created a new branch of science. This enabled them to elucidate, in atomic detail, the structure and mode of action of molecules of the living world: enzymes, vitamins, and viruses, as well as antibiotics. Perutz and Kendrew, from their pioneering work using X-ray diffraction on haemog
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Johansen, Bruce, and Adebowale Akande, eds. Nationalism: Past as Prologue. Nova Science Publishers, Inc., 2021. http://dx.doi.org/10.52305/aief3847.

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Nationalism: Past as Prologue began as a single volume being compiled by Ad Akande, a scholar from South Africa, who proposed it to me as co-author about two years ago. The original idea was to examine how the damaging roots of nationalism have been corroding political systems around the world, and creating dangerous obstacles for necessary international cooperation. Since I (Bruce E. Johansen) has written profusely about climate change (global warming, a.k.a. infrared forcing), I suggested a concerted effort in that direction. This is a worldwide existential threat that affects every living t
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Book chapters on the topic "Solveur RANS non structuré"

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Giacovazzo, Carmelo. "Phasing via electron and neutron diffraction data." In Phasing in Crystallography. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199686995.003.0016.

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Among the statistics freely available on the webpage of the Cambridge Structural Database, there is a detail of interest for this chapter: of the 596 910 crystal structures deposited up to 1 January 2012, only 1534 were solved by neutron data (see Table 1.11). No information is provided on the number of structures solved by electron data because it is negligible (organic samples are soon damaged by the electron beams). A statistical search of the Inorganic Crystal Structure Database (ICSD, Ver. 2012–1, about 150 000 entries; by courtesy of Thomas Weirich) on structures that have been solved by means of electron diffraction, eventually in combination with other techniques, indicates a total of about 0.7%. In spite of limited impact on the databases, electron and neutron diffraction play a fundamental role in materials science and in crystallography. The main reason is that they provide alternative techniques to X-rays. Let us first consider electron diffraction (ED) techniques. The study of crystalline samples at the nanometer scale is mandatory for many industrial applications; indeed, physical properties depend on the crystal structure. Unfortunately it is not unusual for compounds to only exist in the nanocrystalline state; then, traditional X-ray diffraction techniques for atomic structure determination cannot be applied, because of the weak interactions between X-rays and matter. As a consequence, such structures remain unknown, in spite of their technological importance. This limits the contribution of X-ray crystallography to nanoscience, a growing scientific area, crucial to many fields, from semiconductors to pharmaceuticals and proteins. The result is a lack of knowledge on the underlying structure–property relationships, which often retards further research and development. Structure analysis by electron diffraction began as early as the 1930s (in particular, by Rigamonti, in 1936), but the interest of the crystallographic community in such a technique soon faded, mostly because electron diffraction intensities are not routinely transferable into kinematical |F|2. In spite of this limitation, the technique has been used for investigating the structure of many inorganic, organic, and metallo-organic crystals, biological structures, and various minerals, especially layer silicates.
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Glusker, Jenny Pickworth, and Kenneth N. Trueblood. "Outline of a crystal structure determination." In Crystal Structure Analysis. Oxford University Press, 2010. http://dx.doi.org/10.1093/oso/9780199576340.003.0024.

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The stages in a crystal structure analysis by diffraction methods are summarized in Figure 14.1 for a substance with fewer than about 1000 atoms. The principal steps are: (1) First it is necessary to obtain or grow suitable single crystals; this is sometimes a tedious and difficult process. The ideal crystal for X-ray diffraction studies is 0.2–0.3mm in diameter. Somewhat larger specimens are generally needed for neutron diffraction work. Various solvents, and perhaps several different derivatives of the compound under study, may have to be tried before suitable specimens are obtained. (2) Next it is necessary to check the crystal quality. This is usually done by finding out if the crystal diffracts X rays (or neutrons) and how well it does this. (3) If the crystal is considered suitable for investigation, its unitcell dimensions are determined. This can usually be done in 20 minutes, barring complications. The unit-cell dimensions are obtained by measurements of the locations of the diffracted beams (the reciprocal lattice) on the detecting device, these spacings being reciprocally related to the dimensions of the crystal lattice. The space group is deduced from the symmetry of, and the systematic absences in, the diffraction pattern. (4) The density of the crystal may be measured if the crystals are not sensitive to air, moisture, or temperature and can survive the process. Otherwise an estimated value (about 1.3g cm−3 if no heavy atoms are present) can be used. This will give the formula weight of the contents of the unit cell. From this it can be determined if the crystal contains the compound chosen for study, and how much solvent of crystallization is present. (5) At this point it is necessary to decide whether or not to proceed with a complete structure determination. The main question is, of course, whether the unit-cell contents are those expected. One must try to weigh properly the relevant factors, among which are: (i) Quite obviously, the intrinsic interest of the structure. (ii) Whether the diffraction pattern gives evidence of twinning, disorder, or other difficulties that will make the analysis, even if possible, at best of limited value.
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Fawcett, W. Ronald. "Spectroscopic Studies of Liquid Structure and Solvation." In Liquids, Solutions, and Interfaces. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780195094329.003.0009.

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Spectroscopy involves the study of the interactions of electromagnetic radiation with matter. In the case of liquids, radiation of a wide range of frequencies, and thus energies, has been used, all the way from radio-frequency waves to X-rays. Experiments involving neutrons, which are associated with very short wavelengths, are also important. In the spectroscopic experiment the incident radiation may be either absorbed or scattered and the experimental information is obtained by examining the intensity and direction of the radiation after it has passed through the sample. Several spectroscopic techniques will be considered in this chapter. X-ray and neutron diffraction techniques are powerful tools for studying the structure of liquids and have been introduced in chapter 2. They may also be used to study the structure of solutions and determine distribution functions for both the solute and solvent. The feasibility of these experiments depends on the number of different nuclei involved in the system. UV-visible spectroscopy is mainly used to study electronic transitions in polyatomic species. These species are often complex ions formed between the electrolyte and the solvent, or between the cation and one or more anions. Vibrational spectroscopy involves electromagnetic radiation of lower energy, usually in the infrared region. It is used to study intramolecular vibrational modes and how they are altered by the environment in solution. It can also be used to study the bonds formed between solute and solvent in the solvation process. Finally, nuclear magnetic resonance spectroscopy and its application to the study of solvation will be discussed. This is a particularly powerful technique because it provides information about the environment of a given nucleus, and experiments specific to a given nucleus can be carried out provided the nucleus has a non-zero magnetic moment. Several other spectroscopic techniques are commonly used [G1] but those considered here provide a representative picture of what can be learnt from those experiments. One should remember that the atoms and molecules in liquids are not motionless but in a state of flux determined by the intermolecular interactions and temperature. From the study of microwave spectroscopy discussed in chapter 4, it was found that rotational diffusion processes in liquids are characterized by relaxation times the order of a few picoseconds.
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Luster, Markus, and Michael Lassmann. "Radio-iodine treatment of hyperthyroidism." In Oxford Textbook of Endocrinology and Diabetes. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199235292.003.3196.

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Radioactive iodine has been used successfully for almost 70 years since the first treatment took place at the Massachusetts General Hospital in Boston in 1941. However, it was not until after the Second World War that <sup>131</sup>I became generally available for clinical applications (1). The radioactive iodine isotope is chemically identical to ‘stable’ iodine (<sup>127</sup>I) and thus becomes a part of the intrathyroidal metabolism. Its principle of action is based on the emission of β‎-rays with a range of 0.5–2 mm in the tissue leading to high local radiation absorbed doses while sparing surrounding structures. The additional γ‎-ray component of <sup>131</sup>I allows for scintigraphic imaging of the distribution in the gland and can also be used for pre- and post-therapeutic individual dosimetry (see below). Several therapeutic options are available for the treatment of benign thyroid disorders, namely hyperthyroidism: surgical resection (hemithyroidectomy, near-total, or total thyroidectomy), long-term antithyroid drug medication (ATD), and radio-iodine therapy (RAIT) (2, 3). These different treatment modalities are used in varying frequencies depending on geographical location, e.g. iodine supply, availability and logistics, cultural background, and patient-specific features, e.g. goitre size, presence of local symptoms, age, and hormonal status. The diversity of approaches on an international scale still remains impressive and is reflected by a great heterogeneity throughout Europe and also when compared to the USA where radio-iodine therapy is still being applied more frequently than in most European countries (4–8). Radio-iodine therapy was originally aimed at eliminating hyperthyroidism and thus leaving the patient euthyroid. Up-to-date strategies, however, established postradio-iodine induction of hypothyroidism as the treatment objective and, thus, it is included in the category of ‘cure’. This definition holds especially true for the management of Graves’ disease when long-term hypothyroidism was the rule and stabilization of euthyroidism failed in the majority of cases. In fact, the term ‘ablation’, meaning removal or destruction, has been increasingly used to characterize radio-iodine therapy and administration of larger amounts of radio-iodine have tended to make this a self-fulfilling prophecy. Although many clinicians prefer that the end result of treatment be the more easily managed hypothyroidism, others are still reluctant to give up the therapeutic ideal of euthyroidism as the preferred result of radio-iodine therapy and continue their efforts to solve the enigma of thyroid radiosensitivity.
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Conference papers on the topic "Solveur RANS non structuré"

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Mangani, L., E. Casartelli, G. Romanelli, Magnus Fischer, A. Gadda, and P. Mantegazza. "A GPU-Accelerated Compressible RANS Solver for Fluid-Structure Interaction Simulations in Turbomachinery." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57783.

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Computational Fluid Dynamics (CFD) is a fundamental tool for the aerodynamic development in industrial applications. In the usual approach structural deformation due to aerodynamic and thermal loads is often neglected. However, in some cases, where power efficiency is the ultimate goal, an accurate prediction of the structure-flow interaction is essential. This is particularly true for trim and flutter analysis of aircrafts, helicopter and turbomachinery blades. Particularly, turbomachinery trim and flutter predictions still represent a challenge due to phenomena like rotor-stator interaction,
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Clauss, Günther F., Sven Stuppe, and Matthias Dudek. "Transient Wave Packets: New Application in CFD-Methods." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24104.

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Detailed knowledge of motion and seakeeping behaviour in an early design stage is indispensable in modern layout of marine offshore structures. Therefore, numerical methods are used to calculate the Response Amplitude Operators (RAO), which are generally based on potential theory or the Reynolds-Averaged-Navier-Stokes-Equation (RANSE). Calculations with potential-codes are commonly used, well established and time-saving. Main disadvantages are the neglect of viscous effects and the hull structure above the still water level. By using RANSE-methods, these nonlinear effects can be investigated i
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Pakozdi, Csaba, Hans Bihs, Arun Kamath, and Elin Marita Hermundstad. "REEF3D Wave Generation Interface for Commercial CFD Codes." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95921.

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Abstract In recent years CFD developments have shown a trend to combine RANS CFD simulation with other methods such as wave theories or velocity potential based numerical wave tanks, in order to reduce to computation costs. This is however not a new approach, and there exists a large amount of literature about domain decomposition techniques describing a two way coupling between the RANS CFD models and other methods. One can also observe an increasing popularity in the use of a less sophisticated technique where different fluid solvers are combined with one-way coupling. In these methods a pre
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Jiang, Changqing, Ould el Moctar, and Thomas E. Schellin. "Prediction of Hydrodynamic Damping of Moored Offshore Structures 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/omae2019-95935.

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Abstract Usually, mooring system restoring forces acting on floating offshore structures are obtained from a quasi-static mooring model alone or from a coupled analysis based on potential flow solvers that do not always consider nonlinear mooring-induced phenomena or fluid-structure interactions and the associated viscous damping effects. By assuming that only the mooring system influences the restoring force characteristics, the contribution of mooring-induced damping to total system damping is neglected. This paper presents a technique to predict hydrodynamic damping of moored structures bas
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Clauss, Gu¨nther F., Christian E. Schmittner, and Robert Stu¨ck. "Numerical Wave Tank: Simulation of Extreme Waves for the Investigation of Structural Responses." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67048.

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For the deterministic analysis of extreme structure behavior, the hydrodynamics of the exciting wave field, i. e. pressure and velocity fields, must be known. Whereas responses of structures, e. g. motions, can easily be obtained by model tests, the detailed characteristics of the exciting waves are often difficult to determine by measurements. Therefore, numerical wave tanks (NWT) promise to be a handy tool for providing detailed insight into wave hydrodynamics. In this paper different approaches for numerical wave tanks are introduced and used for the simulation of rogue wave sequences. The
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Xu, Jie, Cheng Deng, Xinbo Gao, Dinggang Shen, and Heng Huang. "Predicting Alzheimer's Disease Cognitive Assessment via Robust Low-Rank Structured Sparse Model." In Twenty-Sixth International Joint Conference on Artificial Intelligence. International Joint Conferences on Artificial Intelligence Organization, 2017. http://dx.doi.org/10.24963/ijcai.2017/542.

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Alzheimer's disease (AD) is a neurodegenerative disorder with slow onset, which could result in the deterioration of the duration of persistent neurological dysfunction. How to identify the informative longitudinal phenotypic neuroimaging markers and predict cognitive measures are crucial to recognize AD at early stage. Many existing models related imaging measures to cognitive status using regression models, but they did not take full consideration of the interaction between cognitive scores. In this paper, we propose a robust low-rank structured sparse regression method (RLSR) to address thi
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Murayama, Mitsuhiro, Kazuomi Yamamoto, and Kentaro Tanaka. "Comparison Study of RANS CFD Simulations for Subsonic Civil Aircraft Configurations." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-15024.

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In this paper, the numerical prediction capability of the force predictions in the current computing environments, applicability of turbulence model, and future need of the development are discussed using computational results for geometries used in the series of the AIAA CFD workshop. Computations are conducted for two aircraft wing-body configurations at each cruise Mach condition and a simplified high-lift wing-body configuration with deployed high-lift devices of flap and slat at landing condition using both a multi-block structured grid solver, UPACS, and an unstructured grid solver, TAS-
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Roos Launchbury, David, Luca Mangani, Ernesto Casartelli, and Francesco Del Citto. "A Robust Implementation of a Reynolds Stress Model for Turbomachinery Applications in a Coupled Solver Environment." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15639.

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Abstract In the industrial simulation of flow phenomena, turbulence modeling is of prime importance. Due to their low computational cost, Reynolds-averaged methods (RANS) are predominantly used for this purpose. However, eddy viscosity RANS models are often unable to adequately capture important flow physics, specifically when strongly anisotropic turbulence and vortex structures are present. In such cases the more costly 7-equation Reynolds stress models often lead to significantly better results. Unfortunately, these models are not widely used in the industry. The reason for this is not main
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Pratomo, Hariyo P. S. "Fluid Structure Interaction Simulation of a Benchmark Configuration With a Stress Blended-Eddy Simulation Model." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23101.

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Abstract In this work, the application of a shear stress transport based-RANS/LES turbulence modelling approach on a fluid-structure interaction (FSI) benchmark is considered after a transient computation of turbulent flow over the configuration on an LES quality mesh is to be performed. Within the unsteady decoupled simulation the scale resolving method successfully produces complex unsteady eddy sizes behind the reference test case. At a subcritical Reynolds number, a numerical Strouhal number of 0.184 which is close to a reference value of 0.18 is demonstrated by the RANS/LES turbulence mod
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Jamal, Tausif, Huiyu Wang, and D. Keith Walters. "LES and Hybrid RANS-LES Simulation of a Pulsating Channel Flow." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87990.

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Simulation of turbulent boundary layers for flows characterized by unsteady driving conditions is important for solving complicated engineering problems such as combustion, blood flow in stenosed arteries, and flow over immersed structures. These flows are often dominated by complex vortical structures, regions of varying turbulence intensities, and fluctuating pressure fields. Pulsating channel flow is one such case that presents a unique set of challenges for newly developed and existing turbulence models used in computational fluid dynamics (CFD) solvers. In the present study, performance o
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