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Academic literature on the topic 'Boundary conditions and coupling'

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Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Boundary conditions and coupling"

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Guendelman, E. I., and R. Steiner. "Confining boundary conditions from dynamical coupling constants." Physics Letters B 734 (June 2014): 245–48. http://dx.doi.org/10.1016/j.physletb.2014.05.057.

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CANUTO, C., and A. RUSSO. "A VISCOUS-INVISCID COUPLING UNDER MIXED BOUNDARY CONDITIONS." Mathematical Models and Methods in Applied Sciences 02, no. 04 (December 1992): 461–82. http://dx.doi.org/10.1142/s0218202592000272.

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In this paper we consider a nonlinear modification of a linear convection-diffusion problem in order to get a pure convection equation where the original problem is convection dominated. We extend the results of previous papers by considering mixed Dirichlet/Oblique derivative boundary conditions.
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Oh, Jae-Hyuk. "Boundary conditions for conformally coupled scalar in AdS4." International Journal of Modern Physics A 30, no. 17 (June 20, 2015): 1550098. http://dx.doi.org/10.1142/s0217751x15500980.

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We consider conformally coupled scalar with [Formula: see text] coupling in [Formula: see text] and study its various boundary conditions on AdS boundary. We have obtained perturbative solutions of equation of motion of the conformally coupled scalar with power expansion order by order in [Formula: see text] coupling [Formula: see text] up to [Formula: see text] order. In its dual CFT, we get 2, 4 and 6 point functions by using this solution with Dirichlet and Neumann boundary conditions via AdS/CFT dictionary. We also consider marginal deformation on AdS boundary and get its on-shell and boundary effective actions.
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Durier, Anne Lise, Katell Derrien, and Pierre Gilormini. "Boundary Conditions in the Diffusion of Fluids in Swelling Polymers." Defect and Diffusion Forum 273-276 (February 2008): 186–91. http://dx.doi.org/10.4028/www.scientific.net/ddf.273-276.186.

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Diffusion of fluids in polymers may lead to swelling, which induces stress-diffusion coupling. A simple coupling model is considered, where boundary conditions only are altered, and it leads to a sigmoidal water-uptake curve for a plate in water. Several other models are studied, which are able to induce similar sorption curves by using various boundary conditions, but comparisons between other predictions of the models reveal significant differences. Eventually, none of the models considered is able to reproduce all features of the coupling model.
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Sockol, Peter M., and William A. Johnston. "Coupling conditions for integrating boundary layer and rotational inviscid flow." AIAA Journal 24, no. 6 (June 1986): 1033–35. http://dx.doi.org/10.2514/3.9381.

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Cavaterra, Cecilia, Ciprian G. Gal, Maurizio Grasselli, and Alain Miranville. "Phase-field systems with nonlinear coupling and dynamic boundary conditions." Nonlinear Analysis: Theory, Methods & Applications 72, no. 5 (March 2010): 2375–99. http://dx.doi.org/10.1016/j.na.2009.11.002.

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Xin, Zhe, Shun Xi Wang, Ke Peng Zhang, Zhao Jing Li, and Feng Yun. "Boundary Conditions for Numerical Simulation of Diesel Water Jacket." Advanced Materials Research 291-294 (July 2011): 2328–33. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2328.

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In the research of flow and heat transfer of the diesel engine cooling system, the boundary condition determination was often a difficult problem. The paper calculated the flow velocity and convective heat transfer coefficient respectively for a six-cylinder diesel engine under different boundary conditions which including the water jacket wall as adiabatic condition, average temperature condition, and the boundary conditions from the solid-fluid coupling calculating. And the calculated values of the jacket wall temperatures were compared with that of test. The results showed that the simulation with solid-fluid coupling boundary conditions had better precision. Based on the research, an improved structure design was conducted for the six-cylinder diesel engine, the results of simulation showed that the average flow speed at the internal surface of water jacket could reach up to 0.5m/s, the flow symmetry in each jacket got improved, and the convective heat transfer coefficient could reach more than 2000 W/m2·K. The improved cooling system can meet the design requirements.
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Smotlacha, Jan, and Richard Pincak. "Boundary conditions and Green function approach of the spin–orbit interaction in the graphitic nanocone." International Journal of Geometric Methods in Modern Physics 14, no. 09 (August 2, 2017): 1750116. http://dx.doi.org/10.1142/s021988781750116x.

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The boundary effects affecting the Hamiltonian for the nanocone with curvature-induced spin–orbit coupling were considered and the corresponding electronic structure was calculated. These boundary effects include the spin–orbit coupling, the electron mass acquisition and the Coulomb interaction. Different numbers of the pentagonal defects in the tip were considered. The matrix and analytical form of the Green function approach was used for the verification of our results and the increase of their precision in the case of the spin–orbit coupling.
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CLARK, T. E., and S. T. LOVE. "TWISTED BOUNDARY CONDITIONS AND MATCHING TO THE EFFECTIVE FOUR-DIMENSIONAL THEORY." Modern Physics Letters A 15, no. 17 (June 7, 2000): 1137–45. http://dx.doi.org/10.1142/s0217732300001390.

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Nontrivial twisted boundary conditions associated with extra compact dimensions can produce an ambiguity in the value of the four-dimensional coupling constants of the renormalizable interactions of the twisted fields' zero-modes. Resolving this indeterminacy would require a knowledge of the exact form of the higher dimensional action including the coefficients of higher-dimensional operators. For the case of moderately sized extra dimensions, the uncertainty in the coupling constants can be of order one and may lead to modifications in the stability of the model.
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HARIHARAN, S. I., and DAVID K. JOHNSON. "A FRAMEWORK FOR EVALUATING BOUNDARY CONDITIONS." Journal of Computational Acoustics 03, no. 03 (September 1995): 241–59. http://dx.doi.org/10.1142/s0218396x95000124.

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This paper explores solutions to the spherically symmetric Euler equations. Motivated by the work of Hagstrom and Hariharan7 and Geer and Pope,5 we model the effect of a pulsating sphere in a compressible medium. The literature available on this suggests that an accurate numerical solution requires artificial boundary conditions which simulate the propagation of nonlinear waves in open domains. Until recently, the boundary conditions available are in general linear, and based on non-reflection. Exceptions to this are the nonlinear nonreflective conditions of Thompson,11 and the nonlinear reflective condition of Ref. 7. The former is based on the rate of change of the incoming characteristics, while the latter relies on asymptotic analysis and the method of characteristics and accounts for the coupling of incoming and outgoing characteristics. Furthermore in Ref. 7 it was shown in a test situation in which the flow would reach a steady state over a long time, the method proposed in Ref. 11 could lead to an incorrect steady state. The current study considers periodic flows. Moreover, various other types and techniques of boundary conditions are included in this study. The technique recommended by Ref. 7 proved superior to all others considered, and matched the results of asymptotic methods which are valid for low subsonic Mach numbers.
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Dissertations / Theses on the topic "Boundary conditions and coupling"

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Castro, Nicholas D. "Numerical Modeling of Synthetic Jets in Quiescent Air with Moving Boundary Conditions." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/1466.

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Flow control is a key factor in optimizing the performance of any vehicle moving through fluids. Particularly, in aerodynamics there are many potential benefits for implementing synthetic jets to achieve aircraft designs with less moving parts, uper- maneuverability, and separation control for fuel economy. Piezoelectric synthetic jets are of special interest because of their lightweight and low power consumption. Numerous publications on such jets are available. Actuator properties and boundary conditions relevant to this particular application however are often overlooked. The focus of this project is to numerically model synthetic jets in quiescent air to study the influence of cavity geometry and boundary conditions of the piezoelectric diaphragm on jet velocity. Numerical simulation is performed for two synthetic jet cavities of different height and orifice diameter. The numerical modeling utilizes a turbulent RNG κ – ε model and a moving boundary condition with two oscillating deflection profiles, parabolic and logarithmic, applied to the diaphragm. The actuators modeled are typical Bimorph and Thunder piezoelectric actuators. The initial conditions for the actuators are obtained experimentally resulting in 0.396mm and 0.07mm respectively when driven with a sinusoidal wave input at 1524 V/m and 4064 V/m. Although the velocity boundary numerical model gave overall better results than the current moving-boundary numerical model, the moving-boundary model is more accurate since it better approximates the movement of the diaphragm. From an optimizing viewpoint the moving boundary is more suitable to attempt to optimize the design because displacement magnitude of the diaphragm can be measured directly from experiments. For the higher displacement Bimorph actuator, a logarithmic profile matches the experimental results, whereas the parabolic profile provided better results for the relatively small displacement Thunder actuator. It is thus hypothesized that both tested actuators, Bimorph and Thunder, oscillate according to the specified logarithmic and parabolic profile respectively. Cavity height was briefly investigated for the Bimorph actuator. Results show that cavity height did not make a difference in the centerline velocity for the numerical model. The model fails to consider the important effect of the dynamic coupling of the actuator displacement and the pressure that develops inside the cavity. The pressure values obtained are comparable to the theoretical blocking pressure for the Bimorph in the cavity. The results of this study show that jet formation and development has unique characteristics for each actuator and cavity configuration. The smaller orifice cavity configuration produced a faster, longer, thinner jet with larger vortices than the bigger orifice. During max expulsion, t = 0.25T, and max ingestion, t = 0.75T, a low-pressure area localized at the corners of the orifice, inlet and exit respectively, were observed. All cavity configurations passed all three known jet formation criterions that include, Lo/Do>1, Re > 50, and Re/S2 > 0.16.
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Ablikim, Medina. "Boundary sinh-Gordon model and its supersymmetric extension." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4853/.

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Three different aspects of the sinh-Gordon model are explored in this thesis. We begin, in chapter one, with a summary of the model and the necessary background. Chapter two studies the model with two boundary conditions. Two approaches are presented to investigate the reflection factors off the boundaries and the energy of the theory. In chapter three, perturbation theory is developed to study the theory with one general boundary condition. A contribution to the quantum reflection factor is obtained and compared with the result obtained for the special boundary condition. Chapters four and five investigate the supersymmetric extension of the model in the presence of a single boundary. Firstly, the classical limits of the supersymmetric reflection matrices are checked. The exact reflection factors are studied perturbatively up to the second order of the coupling constant. Secondly, the perturbation theory and the path integral formalism are employed in the supersymmetric model to study the quantum reflection factors. We conclude with a brief sixth chapter describing the outlook for further investigations.
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Trovant, Michael. "A boundary condition coupling strategy for the modeling of metal casting processes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0011/NQ35346.pdf.

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Chenaghlou, Alireza. "Quantum corrections to the classical reflection factor of the sinh-Gordon model." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4347/.

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This thesis studies the quantum reflection factor of the sinh-Gordon model under boundary conditions consistent with integrability. First, we review the affine Toda field theory in Chapter One. In particular, the classical and quantum integrability of the theory are reviewed on the whole line and on the half-line as well, that is, in the presence of a boundary. We next consider the sinh-Gordon model which is restricted to a half-line by boundary conditions maintaining integrability in Chapter Two. A perturbative calculation of the reflection factor is given to one loop order in the bulk coupling and to first order in the difference of the two parameters introduced at the boundary. The result provides a further verification of Ghoshal's formula. The calculation is consistent with a conjecture for the general dependence of the reflection factor on the boundary parameters and the bulk coupling. In Chapter Three, quantum corrections to the classical reflection factor of the sinh-Gordon model are studied up to second order in the difference of boundary data and to one loop order in the bulk coupling. Chapter Four deals with the quantum reflection factor for the sinh-Gordon model with general boundary conditions. The model is studied under boundary conditions which are compatible with integrability and in the framework of the conventional perturbation theory generalised to the affine Toda field theory. It is found that the general form of a subset of the related quantum corrections are hypergeometric functions. Finally, we sum up this thesis in Chapter Five along with some conclusions and suggestions for further future studies.
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Jolley, Kenny. "Multiscale methods for nanoengineering." Thesis, University of Leicester, 2009. http://hdl.handle.net/2381/7809.

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This thesis is presented in two sections. Two different multiscale models are developed in order to increase the computational speed of two well known atomistic algorithms, Molecular Dynamics (MD) and Kinetic Monte Carlo (KMC). In Section I, the MD method is introduced. Following this, a multiscale method of linking an MD simulation of heat conduction to a finite element (FE) simulation is presented. The method is simple to implement into a conventional MD code and is independent of the atomistic model employed. This bridge between the FE and MD simulations works by ensuring that energy is conserved across the FE/MD boundary. The multiscale simulation allows for the investigation of large systems which are beyond the range of MD. The method is tested extensively in the steady state and transient regimes, and is shown to agree with well with large scale MD and FE simulations. Furthermore, the method removes the artificial boundary effects due to the thermostats and hence allows exact temperatures and temperature gradients to be imposed on to an MD simulation. This allows for better study of temperature gradients on crystal defects etc. In Section II, the KMC method is introduced. A continuum model for the KMC method is presented and compared to the standard KMC model of surface diffusion. This method replaces the many discrete back and forth atom jumps performed by a standard KMC algorithm with a single flux that can evolve in time. Elastic strain is then incorporated into both algorithms and used to simulate atom deposition upon a substrate by Molecular Beam Epitaxy. Quantum dot formation due to a mismatch in the lattice spacing between a substrate and a deposited film is readily observed in both models. Furthermore, by depositing alternating layers of substrate and deposit, self-organised quantum dot super-lattices are observed in both models.
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Moretti, Rocco. "Étude et amélioration des méthodologies de couplage aérothermique fluide-structure." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM076.

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Ces travaux s’inscrivent dans la résolution de problèmes couplés aérothermiques. Il s’agit notamment d’améliorer les méthodes de couplage en termes de précision et de robustesse. La stabilité du couplage aérothermique en régime permanent a été d’abord étudiée (couplage faible). Un nombre de Biot numérique a été défini ce qui permet d’évaluer l’intensité de l’interaction thermique fluide-structure. Plusieurs méthodes (Dirichlet-Robin, Neumann-Robin et Robin-Robin) ont été étudiées et leur domaine de validité a été défini. La méthode Dirichlet-Robin avec un coefficient de sécurité s’est avérée la plus robuste et simple à mettre en œuvre. La prise en compte du rayonnement implique une déstabilisation majeure du problème aérothermique. La méthode de stabilisation a donc été modifiée afin de pouvoir stabiliser ce type de calcul. Dans un deuxième temps, la résolution de problèmes couplés aérothermiques en régime transitoire a été étudiée via l’algorithme partitionné quasi-instationnaire. Il s’agit d’une procédure itérative (couplage fort) entre le solide en régime transitoire et des états fluides en régime stationnaire, assurant ainsi l’égalité des flux de chaleur et de la température à chaque instant de couplage. La précision de cet algorithme a été analysée et améliorée. Enfin, l’algorithme quasi-instationnaire a été analysé sur des problèmes aérothermiques quasi-industriels de disques de turbine et compresseur aéronautiques
This work deals with the solution of coupled aerothermal problems. The aim of the work is to improve the accuracy and robustness of the coupling techniques. The stability of the aerothermal coupling for steady state problems is first studied (weak coupling). A numerical Biot number is defined, which allows to evaluate the intensity of the fluid-structure thermal interaction. Several methods (Dirichlet-Robin, Neumann-Robin and Robin-Robin) are studied and their ranges of validity are defined. The Dirichlet-Robin method with a safety coefficient, which presents the easiest implementation, proves to be the most robust. Taking radiation into account implies a major destabilization of the aerothermal problem. Thus, the stabilization method is modified in order to be able to stabilize this type of calculation. In the second part, the solution of coupled aerothermal problems in the transient regime is studied using the quasidynamic partitioned algorithm. This is an iterative procedure (strong coupling) between the thermal problem in the solid solved in the transient regime and the flow field at the steady state, thus ensuring equal heat flux and temperature at each coupling time. The accuracy of this algorithm is analysed and improved. Finally, the quasi-dynamic algorithm is analysed on quasi-industrial aerothermal problems of aeronautical compressor and turbine discs
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Mikhaylenko, Maxim A. "Development and Application of the Boundary Singularity Method to the Problems of Hydrodynamic and Viscous Interaction." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1442423671.

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Maati, Amel. "Mise en œuvre de formalismes pour la modélisation de grands réseaux périodiques d'antennes." Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0009/document.

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Cette thèse se place dans le contexte général de la modélisation de réseaux d’antennes de grande taille, avec pour objectif d’atteindre un niveau de précision suffisamment élevé pour permettre une optimisation complète des performances et en particulier une amélioration de l’efficacité énergétique. Partant du constat que l’optimisation électromagnétique de grands réseaux représente un verrou si les couplages doivent être modélisés efficacement, cette thèse propose la mise en œuvre d’une méthode permettant la modélisation fine de grands réseaux d'antennes tout en réduisant les temps de calcul et en conservant un haut degré de précision. L'objectif est de montrer qu'une approche dérivée des formalismes périodiques infinis connus de la littérature permet d'obtenir une matrice [S] complète d'un réseau depuis l'étude d'une cellule unitaire. Après avoir présenté un état de l'art sur les réseaux d'antennes et leurs méthodes d'analyse, l'approche de modélisation proposée est détaillée. Des véhicules de test numériques et expérimentaux, permettant de valider cette méthode de modélisation, sont ensuite réalisés. L'approche est enfin utilisée avec succès pour deux types d'application
This thesis is organized in the general context of modeling a large antenna arrays with the aim of achieving a high level of precision. This modeling allows a complete optimization of the performances and an enhancement of the energy efficiency. Given that the electromagnetic optimization of large arrays still represents a challenge if the mutual coupling is not efficiently modeled. This work offers the implementation of a method allowing the precise modeling of large antenna arrays while reducing the computation time and maintaining a high degree of precision. The aim is to demonstrate that the derived approach from the infinite periodic formalisms makes it possible to obtain a full [S] matrix of an array based on the study of a unit cell. After presenting a state of the art of antenna arrays and their methods of analysis, the proposed modeling approach is explained. Numerical and Experimental demonstrators are then made for the validation. Finally, this method is successfully used for two types of applications
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Warman, Craig S. "Understanding the spatial and temporal variation in anthropogenically induced channel response in the Irwin River catchment." University of Western Australia. School of Earth and Geographical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0214.

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The Irwin River catchment, located in the central western region of Western Australia, has been the scene of significant geomorphological change over both historical and geological timescales. This thesis focuses on the most recent of these changes, the anthropogenic imprint, through the development of a catchment-scale understanding of system behaviour. Analysis and modelling of changes in the hydrological behaviour of the system indicates that while the Irwin River has displayed a natural susceptibility to large flood events, these have been exacerbated by the widespread clearing of native vegetation throughout the catchment. As a result, when such events do occur, the catchment response is now larger, more direct and has a greater ability to cause erosion. However, the nature and detail of sediment yield processes and stream channel response varies markedly throughout the system. A series of representative channel reaches, as defined by their planform characteristics, geometry and architecture, are presented to illustrate spatial changes in stream channel behaviour. A distinct variation in river morphotypes is seen both downstream throughout the system as well as across the tributary sub-catchments of the Irwin River, Lockier River and Green Brook. This inter and intra sub-catchment variation in stream channel response can be attributed to changes in the boundary conditions and coupling mechanisms in operation throughout the Irwin River system. The pronounced spatial variability in response to human disturbance and the changing nature of catchment-scale connectivity seen in the Irwin River system differs markedly to that reported elsewhere in the literature. Appreciation of the variability in form, behaviour and evolutionary history throughout the Irwin River catchment not only provides the foundation for effective management but also contributes to a wider understanding of fluvial system behaviour. Unlike the majority of existing literature, which tends to identify and measure channel changes in a single catchment where historical variation to the sediment and discharge regime is well known, this study demonstrates the role of boundary conditions in determining the response of the fluvial system to changing environmental controls.
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Fajardo, Peña Pablo. "Methodology for the Numerical Characterization of a Radial Turbine under Steady and Pulsating Flow." Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/16878.

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The increasing use of turbochargers is leading to an outstanding research to understand the internal flow in turbomachines. In this frame, computational fluid dynamics (CFD) is one of the tools that can be applied to contribute to the analysis of the fluid-dynamic processes occurring in a turbine. The objective of this thesis is the development of a methodology for performing simulations of radial turbomachinery optimizing the available computational resources. This methodology is used for the characterization of a vaned-nozzle turbine under steady and pulsating flow conditions. An important effort has been devoted in adjusting the case configuration to maximize the accuracy achievable with a certain computational cost. Concerning the cell size, a local mesh independence analysis is proposed as a procedure to optimize the distribution of cells in the domain, thus allowing to use a finer mesh in the most suitable places. Particularly important in turbomachinery simulations is the influence of the approach for simulating rotor motion. In this thesis two models have been compared: multiple reference frame and sliding mesh. The differences obtained using both methods were found to be significant in off-design regions. Steady flow CFD results have been validated against global measurements taken on a gas-stand. The modeling of a turbine, installed either on a turbocharger test rig or an engine, requires the calculation of the flow in the ducts composing the system. Those ducts could be simulated assuming a one-dimensional (1D) approximation, and thus reducing the computational cost. In this frame of ideas, two CFD boundary conditions have been developed. The first one allows performing coupled 1D-3D simulations, communicating the flow variables from each domain through the boundary. The second boundary condition is based in a new formulation for a stand-alone anechoic end, which intends to represent the flow behavior of an infinite duct. Finally, the turbine was simulat
Fajardo Peña, P. (2012). Methodology for the Numerical Characterization of a Radial Turbine under Steady and Pulsating Flow [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/16878
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Books on the topic "Boundary conditions and coupling"

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Trovant, Michael. A boundary condition coupling strategy for the modeling of metal casting processes. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1998.

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Titcombe, Michele Susanne. Orthogonalization method for determination of boundary layer receptivity coefficients. [Downsview, Ont.]: University of Toronto, Graduate Dept. of Aerospace Science and Engineering, 1993.

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Manteuffel, Thomas A. Preconditioning and boundary conditions. New York: Courant Institute of Mathematical Sciences, New York University, 1988.

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Yahya, Rahmat-Samii, ed. Impedance boundary conditions in electromagnetics. Washington, DC: Taylor & Francis, 1995.

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R, James C. L. Beyond a boundary. London: Serpent's Tail, 1994.

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R, James C. L. Beyond a boundary. London: Serpent's Tail, 2000.

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R, James C. L. Beyond a boundary. 5th ed. Durham: Duke University Press, 2013.

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R, James C. L. Beyond a boundary. London: Serpent's Tail, 1994.

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R, James C. L. Beyond a boundary. Durham: Duke University Press, 1993.

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Webster, Paul. Rainfall boundary conditions for hydrological design. Birmingham: University of Birmingham, 1998.

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Book chapters on the topic "Boundary conditions and coupling"

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Leyh, S., and C. Morsbach. "The Coupling of a Synthetic Turbulence Generator with Turbomachinery Boundary Conditions." In ERCOFTAC Series, 349–55. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42822-8_46.

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Sofronov, I., and L. Dovgilovich. "Transparent Boundary Conditions for the Wave Equation: High-Order Approximation and Coupling with Characteristic NRBCs." In Lecture Notes in Computational Science and Engineering, 465–73. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19800-2_43.

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Nagórka, Arkadiusz, Norbert Sczygiol, and Grzegorz Szwarc. "Coupling of Thermal and Mechanical Phenomena by Boundary Conditions in Numerical Modelling of Solidifying Castings." In Parallel Processing and Applied Mathematics, 711–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-48086-2_79.

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Billet, Florence, Maxime Sermesant, Hervé Delingette, and Nicholas Ayache. "Cardiac Motion Recovery and Boundary Conditions Estimation by Coupling an Electromechanical Model and Cine-MRI Data." In Functional Imaging and Modeling of the Heart, 376–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01932-6_41.

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Boubendir, Y., A. Bendali, and N. Zerbib. "Coupling Finite and Boundary Element Methods Using a Localized Adaptive Radiation Condition for the Helmholtz’s Equation." In Lecture Notes in Computational Science and Engineering, 445–52. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-18827-0_45.

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Mohamad, A. A. "Boundary Conditions." In Lattice Boltzmann Method, 47–51. London: Springer London, 2019. http://dx.doi.org/10.1007/978-1-4471-7423-3_4.

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Britz, Dieter. "Boundary Conditions." In Digital Simulation in Electrochemistry, 85–102. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-31524-7_6.

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Britz, Dieter, and Jörg Strutwolf. "Boundary Conditions." In Monographs in Electrochemistry, 101–21. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30292-8_6.

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Sagaut, Pierre. "Boundary Conditions." In Scientific Computation, 271–307. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04695-1_9.

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Okereke, M., and S. Keates. "Boundary Conditions." In Springer Tracts in Mechanical Engineering, 243–97. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67125-3_8.

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Conference papers on the topic "Boundary conditions and coupling"

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Hérard, Jean-Marc, and Olivier Hurisse. "Boundary Conditions For The Coupling Of Two-Phase Flow Models." In 18th AIAA Computational Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-4458.

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Ries, M., Y. Jain, P. Steinmann, and S. Pfaller. "Revised Boundary Conditions for FE-MD Multiscale Coupling of Amorphous Polymers." In VIII Conference on Mechanical Response of Composites. CIMNE, 2021. http://dx.doi.org/10.23967/composites.2021.014.

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Mignolet, Marc, and Christian Soize. "Nonparametric Stochastic Modeling of Structures with Uncertain Boundary Conditions and Uncertain Coupling Between Substructures." In 49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
16th AIAA/ASME/AHS Adaptive Structures Conference
10t. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-2291.

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Quiroga-Goode, G. "Seismic-Fluid Diffusion Coupling for Two Sets of Macroscopic Boundary Conditions in Composite Materials." In 59th EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 1997. http://dx.doi.org/10.3997/2214-4609-pdb.131.gen1997_f011.

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Wang, Qiusheng. "A Lumped Thermal Model Including Thermal Coupling Effects and Boundary Conditions for Capacitor Banks." In 2018 International Power Electronics Conference (IPEC-Niigata 2018-ECCE Asia). IEEE, 2018. http://dx.doi.org/10.23919/ipec.2018.8507401.

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Jin, Xiaoliang, and Narahara Gopal Koya. "Prediction of Coupled Torsional-Axial Vibrations of Drilling Tool With Clamping Boundary Conditions." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8665.

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Coupled torsional-axial vibrations of the drilling tool play a significant role in the machining dynamics of the drilling process. In this paper, the torsional-axial vibrations of the drilling tool due to the warping deformation of the pretwisted flute is modeled. An enhanced receptance coupling model is developed to predict the coupled torsional-axial vibrations of the drilling tool considering the dynamics of fixture and clamping conditions. Rigid and flexible receptance coupling methods are used, with the simulation results verified through modal experiments. The proposed model is able to provide optimum drilling tool configurations to avoid undesired tool vibrations and improve hole quality.
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ROWE, W., and F. EHLERS. "Coupling linearized far-field boundary conditions with non-linear near-field solutions in transonic flow." In 26th Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-599.

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Marais, Deon, and Gideon P. Greyvenstein. "Providing Thermal-Hydraulic Boundary Conditions to the Reactor Code TINTE Through a Flownex-TINTE Coupling." In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58110.

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TINTE is a well established reactor analysis code which models the transient behaviour of pebble bed reactor cores but it does not include the capabilities to model a power conversion unit (PCU). This raises the issue that TINTE cannot model full system transients. One way to overcome this problem is to supply TINTE with time-dependant thermal-hydraulic boundary conditions which are obtained from PCU simulations. This study investigates a method to provide boundary conditions for the nuclear code TINTE during full system transients. This was accomplished by creating a high level interface between the systems CFD code Flownex and TINTE. An indirect coupling method is explored whereby characteristics of the PCU are matched to characteristics of the nuclear core. This method eliminates the need to iterate between the two codes. A number of transients are simulated using the coupled code and then compared against stand-alone Flownex simulations. The coupling method introduces relatively small errors when reproducing mass flow, temperature and pressure in steady state analysis, but become more pronounced when dealing with fast thermal-hydraulic transients. Decreasing the maximum time step length of TINTE reduces this problem, but increases the computational time.
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ABDELNASER, A., and M. SINGH. "FORCED AND RANDOM VIBRATIONS OF COMPOSITE BEAMS WITH BENDlNG-TORSlON COUPLING AND GENERAL BOUNDARY CONDITIONS." In 34th Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-1375.

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Martin, Benjamin, Florent Duchaine, Laurent Gicquel, Nicolas Odier, and Jérôme Dombard. "Accurate Inlet Boundary Conditions to Capture Combustion Chamber and Turbine Coupling With Large-Eddy Simulation." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-58854.

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Abstract The coupling between different components of a turbomachinery is becoming more widely studied especially by use of Computational Fluid Dynamics. Such simulations are of particular interest especially at the interface between a combustion chamber and a turbine, for which the prediction of the migration of hotspots generated in the chamber is of paramount importance for performance and life-duration issues. Despite this need for fully integrated simulations, typical turbomachinery simulations however often only consider isolated components with either time-averaged constant value, radial profile or least frequently 2D maps imposed at their inlet boundaries preventing any accurate two-way coupling. The objective of the present study is to investigate available solutions to perform isolated simulations while taking into account the effect of multi-component coupling. Investigations presented in the paper focus on the FACTOR configuration. The fist step of the proposed method is to record conservative variables solved by the LES code at the interface plane between the chamber and the turbine of a reference simulation. Then, using the Spectral Proper Orthogonal Decomposition (SPOD) method, the recorded data is analysed and can be partially reconstructed using different numbers of frequencies. Using the partial reconstructions, it is then possible to replicate a realistic inlet boundary condition for isolated turbine simulations with both velocity and temperature fluctuations, while reducing the storage cost compared to the initial database. The integrated simulation is then compared to the isolated simulations as well as against simulations making use of averaged quantities with or without synthetic turbulence injection at their inlet. The isolated simulations for which the inlet condition is reconstructed with a large number of frequencies show very good agreement with the fully integrated simulation compared to the typical isolated simulation using average quantities at the inlet. As expected, decreasing the number of frequencies in the reconstructed signal deteriorates the accuracy of the resulting signal compared to the full recorded database. However, isolated simulations with a low number of frequencies still perform better than standard boundary conditions, especially from an aero-thermal point of view.
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Reports on the topic "Boundary conditions and coupling"

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King, David. GenCade Lateral Boundary Conditions. Coastal and Hydraulics Laboratory (U.S.), February 2017. http://dx.doi.org/10.21079/11681/21469.

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Hale, Jack K., and Carlos Rocha. Interaction of Diffusion and Boundary Conditions,. Fort Belvoir, VA: Defense Technical Information Center, July 1986. http://dx.doi.org/10.21236/ada170217.

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Hale, J. K., and C. Rocha. Varying Boundary Conditions with Large Diffusivity,. Fort Belvoir, VA: Defense Technical Information Center, March 1985. http://dx.doi.org/10.21236/ada158643.

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Zywicz, E. DYNA3D Non-reflecting Boundary Conditions - Test Problems. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/895422.

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Schultz, Ryan. Acoustoelasticity Testing: Changing Boundary Conditions and Damping. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1459101.

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Hackney, S. A., J. K. Lee, and M. R. Plichta. Boundary stability under nonequilibrium conditions. Final report. Office of Scientific and Technical Information (OSTI), August 1999. http://dx.doi.org/10.2172/756783.

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Wardlaw, A. B. Far Field Boundary Conditions for Underwater Explosions. Fort Belvoir, VA: Defense Technical Information Center, December 1994. http://dx.doi.org/10.21236/ada476884.

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deRada, Sergio, and Igor Shulman. Evaluation of Global HYCOM Initial and Boundary Conditions. Fort Belvoir, VA: Defense Technical Information Center, September 2008. http://dx.doi.org/10.21236/ada533587.

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Huang, H. ,. Diaz de la Rubia, T. Periodic boundary conditions for three dimensional dislocation dynamics. Office of Scientific and Technical Information (OSTI), January 1997. http://dx.doi.org/10.2172/562075.

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Laslett, L. J., S. Caspi, and M. Helm. Incorporation of toroidal boundary conditions into program POISSON. Office of Scientific and Technical Information (OSTI), July 1987. http://dx.doi.org/10.2172/5981119.

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