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Relevant bibliographies by topics / Grid generation; Grid solving; Optimisation

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Academic literature on the topic 'Grid generation; Grid solving; Optimisation'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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Journal articles on the topic "Grid generation; Grid solving; Optimisation"

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Koivisto, Matti, Juan Gea‐Bermúdez, and Poul Sørensen. "North Sea offshore grid development: combined optimisation of grid and generation investments towards 2050." IET Renewable Power Generation 14, no. 8 (February 26, 2020): 1259–67. http://dx.doi.org/10.1049/iet-rpg.2019.0693.

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Zhou, Yuancheng, and Markus Hegland. "The application of sparse grid quadrature in solving stochastic optimisation problems." ANZIAM Journal 60 (June 19, 2019): 16. http://dx.doi.org/10.21914/anziamj.v60i0.14060.

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Martynenko, S. I. "Remarks on Generation of the Orthogonal Structured Grids." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 82 (2019): 16–26. http://dx.doi.org/10.18698/1812-3368-2019-1-16-26.

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Grid generation techniques have contributed significantly toward the application of mathematical modeling in large-scale engineering problems. The structured grids have the advantage that very robust and parallel computational algorithms have been proposed for solving (initial-)boundary value problems. Orthogonal grids make it possible to simplify an approximation of the differential equations and to increase computation accuracy. Opportunity of the orthogonal structured grid generation for solving two- and three-dimensional (initial-)boundary value problems is analyzed in the article in assumption that isolines or isosurfaces of d (=2,3) functions form this grid. Condition of the isolines/isosurfaces orthogonality is used for formulation of the boundary value problems, the solutions of which will be form the orthogonal grid. A differential substitution is proposed to formulate the boundary value problems directly from the orthogonality condition of the grid. The substitution leads to the general partial differrential equations with undetermined coefficients. In the two-dimensional case, it is shown that the orthogonal grid generation is equivalent to the solution of partial differential equations of either elliptic or hyperbolic type. In three-dimensional domains, an orthogonal grid can be generated only in special cases. The obtained results are useful for mathematical modeling of the complex physicochemical processes in the technical devices

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Qiu, Lu, and Yan Song Li. "Micro-Grid System Integrated with GSHP." Advanced Materials Research 1092-1093 (March 2015): 288–91. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.288.

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In the past few decades, power system has developed into a large-scale network system of centralized electricity generation and long-distance transmission. But in recent years, electrical load has increasing, while the grid has not developed simultaneously, it makes transmission capacity of long-distance transmission lines increase, so as the decline of stability and security of power grid. In order to achieve the goal of not only increasing utilization of renewable energy, but also solving the drawbacks of large-scale power systems, implementing distributed power generation is an effective way. Despite the advantages of distributed generation, there are many problems in itself, for example, the high cost of distributed generation stand-alone access and control difficulties. In addition, distributed generation is a non-controllable source for large grid. Then in the beginning of this century, scholars have proposed the concept of micro-grid.

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Parashar, Sonam, Anil Swarnkar, Khaleequr Rehman Niazi, and Nikhil Gupta. "Modified elephant herding optimisation for economic generation co-ordination of DERs and BESS in grid connected micro-grid." Journal of Engineering 2017, no. 13 (January 1, 2017): 1969–73. http://dx.doi.org/10.1049/joe.2017.0673.

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Du, Lingyu, Qiuhe Ma, Jin Ben, Rui Wang, and Jiahao Li. "Duality and Dimensionality Reduction Discrete Line Generation Algorithm for a Triangular Grid." ISPRS International Journal of Geo-Information 7, no. 10 (September 27, 2018): 391. http://dx.doi.org/10.3390/ijgi7100391.

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Vectors are a key type of geospatial data, and their discretization, which involves solving the problem of generating a discrete line, is particularly important. In this study, we propose a method for constructing a discrete line mathematical model for a triangular grid based on a “weak duality” hexagonal grid, to overcome the drawbacks of existing discrete line generation algorithms for a triangular grid. First, a weak duality relationship between triangular and hexagonal grids is explored. Second, an equivalent triangular grid model is established based on the hexagonal grid, using this weak duality relationship. Third, the two-dimensional discrete line model is solved by transforming it into a one-dimensional optimal wandering path model. Finally, we design and implement the dimensionality reduction generation algorithm for a discrete line in a triangular grid. The results of our comparative experiment indicate that the proposed algorithm has a computation speed that is approximately 10 times that of similar existing algorithms; in addition, it has better fitting effectiveness. Our proposed algorithm has broad applications, and it can be used for real-time grid transformation of vector data, discrete global grid system (DGGS), and other similar applications.

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Xu, Jian Yuan, Jia Jue Li, Jie Jun Zhang, and Yu Zhu. "Power Reserve Classification and Control for Peaking Balance with Intermittent Generation Grid." Applied Mechanics and Materials 521 (February 2014): 252–55. http://dx.doi.org/10.4028/www.scientific.net/amm.521.252.

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The problem of intermittent generation peaking is highly concerned by the grid operator. To build control model for solving unbalance of peaking is great necessary. In this paper, we propose reserve classification control model which contain constant reserve control model with real-time reserve control model to guide the peaking balance of the grid with intermittent generation. The proposed model associate time-period constant reserve control model with real-time reserve control model to calculate, and use the peaking margin as intermediate variable. Therefore, the model solutions which are the capacity of reserve classification are obtained. The grid operators use the solution to achieve the peaking balance control. The proposed model was examined by real grid operation case, and the results of the case demonstrate the validity of the proposed model.

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Oldham, D., J. H. Davies, and T. N. Phillips. "Generic polyhedron grid generation for solving partial differential equations on spherical surfaces." Computers & Geosciences 39 (February 2012): 11–17. http://dx.doi.org/10.1016/j.cageo.2011.06.004.

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Heitkoetter, Wilko, Wided Medjroubi, Thomas Vogt, and Carsten Agert. "Comparison of Open Source Power Grid Models—Combining a Mathematical, Visual and Electrical Analysis in an Open Source Tool." Energies 12, no. 24 (December 11, 2019): 4728. http://dx.doi.org/10.3390/en12244728.

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Power grid models are important in relation to several topics and applications, especially the modelling, optimisation and extension of electrical grids. The significance of grid models is heightened by the increase in renewable energy generation and the challenges associated with its integration into the power grid. However, despite their crucial importance, grid models have generally not been made publicly available for scientific studies or technical analyses. Little information has been published about either the details and methods used in the derivation of these models, or their input and output data. Recently, several projects were initiated in an effort to address this by developing open source grid models and associated data. These projects used different approaches and methods, but most are based on the OpenStreetMap database. The goal of this paper is to compare the different available grid models on the basis of the structure and derivation methods used. Therefore, a novel combination of a graph-theoretical, Geographic Information System (GIS)-based and power-related comparison level is introduced using the open source tool AutoGridComp, which was developed by the authors. The grid models considered in this study are the Scientific Grid Model (SciGRID), GridKit and open street map Transmission Grid Model (osmTGmod) models for Germany.

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Azman, Azarina, Shafrida Sahrani, Kismet Hong Ping, and Dayang Azra Awang Mat. "A New Approach for Solving Inverse Scattering Problems with Overset Grid Generation Method." TELKOMNIKA (Telecommunication Computing Electronics and Control) 15, no. 2 (March 1, 2017): 820. http://dx.doi.org/10.12928/telkomnika.v15i1.6127.

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Dissertations / Theses on the topic "Grid generation; Grid solving; Optimisation"

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Burgess, David A. "Parallel computing for unstructured mesh algorithms." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318758.

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Torrent-Fontbona, Ferran. "Optimisation methods meet the smart grid. New methods for solving location and allocation problems under the smart grid paradigm." Doctoral thesis, Universitat de Girona, 2015. http://hdl.handle.net/10803/301440.

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The smart grid offers a new infrastructure for the management of energy demand and generation towards a sustainable future. Accordingly, there is the objective to provide consumers with a response capacity to stimuli of the electricity market, and at the same time, to efficiently manage the generation system which tends to a diversification of the generators and the energy sources. For that purpose, this thesis is first focused on providing to consumers methods for managing their energy consumption and then reducing costs according to their production activities. Next, this thesis focuses on electricity generation, tackling the problem of how to share out energy production among a set of distributed generators using self-organisation. Finally, it tackles the problem of planning the placement of new generators suing meta-heuristics.
La xarxa elèctrica intel·ligent ofereix una nova infraestructura per a la gestió de la demanda i generació d'electricitat cap a un futur més sostenible. En aquest sentit, hi ha l'objectiu de proveir els consumidors de capacitat de reacció davant d'estímuls del mercat elèctric i, al mateix temps, gestionar de forma eficient un sistema de generació que tendeix cap a una diversificació. Amb aquest objectiu, aquesta tesi primer es centra a desenvolupar mètodes perquè els consumidors puguin gestionar els seus consums i així també reduir-ne els costos d'acord amb les seves activitats de producció. Posteriorment, la tesi es centra en la generació elèctrica abordant el problema de com repartir la producció d'energia d'entre un conjunt de generadors distribuïts utilitzant mètodes auto-organitzatius. Finalment, s'aborda la planificació de nous generadors utilitzant mètodes metaheurístics.

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Calhoun, Donna. "A Cartesian grid method for solving the streamfunction vorticity equations in irregular geometries /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/6753.

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Guilmineau, Justine Valérie Magali. "Study of a generation capacity expansion on an island." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-287354.

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The study carried out in this master thesis is part of a larger project led by Energynautics GmbH focusing on renewable energy development in the Caribbean. One of the Caribbean states, consisting of multiple islands, has set a target of 30 % of renewable energy in the power sector by 2030. The first objective of the thesis is to develop optimal generation capacity expansion plans for two different islands of this country, utilizing solar PV generation, which is the only available renewable energy resource. To achieve this objective, three main tasks are identified. The first is the development of an optimal generation capacity expansion plan for the next three years using the optimization tool HOMER Energy. At the beginning only diesel generation is present on the islands. For each study case year, the installed capacity of PV and BESS is optimized and enabling technologies such as curtailment (controllability of PV) and grid-forming inverters are deployed. The second task focuses on the development of a new dispatch strategy, improving on the black box dispatch algorithms built into HOMER. The dispatch strategy minimises the cost of electricity generation and is based on a rolling 48 hours forecasts of the load and PV. It is implemented in MATLAB and linked to HOMER via the built-in MATLAB interface. As HOMER is focused on generation expansion and dispatch and inherently neglects the grid, a grid study is required to assess the stability of the network. This study is the last task of the thesis and is limited to determined steady-state voltage and the asset loading on one of the studied islands through load flow simulations in DIgSILENT PowerFactory. It is shown that there are no major issues even at high PV shares, however, grid performance can be improved if the PV unit is equipped with reactive power capability to control the voltage. A study on the impact of the Q(U)- control and the PQ-capability of the PV and BESS inverters is performed.
Studien som genomförts i detta examensarbete är en del av ett större projekt vilket leds av Energynautics GmbH med fokus på utveckling av förnybar energi i Karibien. En av de Karibiska staterna, bestående av flera öar, har ett mål på 30 % förnybar energi i elkraftssektorn innan 2030. Första syftet med examensarbetet är att utveckla optimala utbyggnadsplaner för produktionskapaciteten för två olika öar i detta land, med användning av solcellsproduktion, vilket är den enda tillgängliga förnybara energikällan. Den första uppgiften är utvecklingen av en optimal utbyggnadsplan för produktionskapaciteten för de kommande tre åren med optimeringsverktyget HOMER Energy. Från början fanns det bara dieselgeneratorer på öarna. För varje studerat år optimeras den installerade kapaciteten av PV och BESS samt aktivering av möjliggörande teknologier som begränsning av PV-produktion och grid-forming växelriktare. Den andra uppgiften fokuserar på utvecklingen av en ny driftsstrategi, förbättring av den basala driftsalgoritm som är inbyggd i HOMER. Driftsstrategin minimerar kostnaden av elproduktionen och är baserad på en 48 timmars prognos av laster och PV. Den är implementerad i MATLAB och kopplad till HOMER via det inbyggda MATLABgränssnittet. Eftersom HOMER fokuserar på produktionsutbyggnad och drift och i praktiken försummar elnätet, krävs en studie av elnätet för att utvärdera stabiliteten av elnätet. Studien av denna sista uppgift i examensarbetet är begränsad till att bestämma spänningen vid jämnviktsläge och den utvärderade lasten på en av de studerade öarna genom belastningsfördelningsberäkning i DIgSILENT PowerFactory. Det visade sig att det inte fanns några stora problem även med stora andelar PV, men elnätets prestanda kan förbättras om PV-omriktarna är utrustade med reaktiv effektstyrning som kontrollerar spänningen. En studie avinverkan från Q(U)-styrning och PQ-kapacitet av PV- och BESS-växelriktare har utförts.

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Touré, Sellé. "Optimisation des réseaux : réseau actif et flexible." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT095/document.

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Le Système Électrique est soumis ces dernières années à plusieurs évolutions, depuis la dérégulationdu marché d'énergie à l'intégration de plus en plus importante de Générateurs Dispersés (GED). Ainsi,dans le cadre du concept de Smart Grid, les nouvelles technologies de l'information et de lacommunication (NTIC) offrent de nouvelles perspectives pour la gestion et l'exploitation des réseauxde distribution.Dans ce contexte, de nouveaux outils sont étudiés. Encore appelés Fonctions Avancéesd’Automatisation (FAA), le but principal de ces outils est d’utiliser tous les composants du réseau dedistribution de manière coordonnée en vue de les rendre plus actifs, flexibles et d’augmenter leurefficacité opérationnelle. Dans notre cas, nous avons étudié les fonctions associées à la reconfigurationen régime normal, du réglage de la tension et l’hybridation de ces deux derniers, tout en tenant comptede la présence des GED. En partant du comportement physique inhérent aux composants du réseau,plusieurs modèles ont été proposés. Certains sont tirés de la théorie des graphes et d’autres sur l’outilpuissant de la reformulation mathématique pour « convexifier » nos modèles. Cette modélisationadoptée répond à la fois à la nécessité de prendre en compte tous les moyens de réglages qui peuventêtre discrets (prises des transformateurs avec régleurs en charge ou des gradins de condensateurs),binaires (état de connectivité des composants) et continues (puissance réactive de la DG) et par lechoix des outils et des algorithmes d'optimisation mixte. En effet, la complexité de ces problèmes sonttelles que nous avons exploré à la fois des algorithmes méta-heuristiques (ACF : Algorithme desColonies de Fourmis) que déterministes (Décomposition de Benders Généralisée, Algorithme duBranch and Cut)
The Electric Power System is undergoing a lot of evolutions in recent years, including the energymarket deregulation and the increasing integration of Dispersed Generators (DG). Therefore, withinthe framework of Smart Grid concept, the New Information and Communication Technologies (NICT)provide new perspectives to manage and operate distribution networks.In this context, new tools, called Advanced Distribution Automation functions (ADA, are beingstudied). The main objective of these tools is to use all the distribution network components in acoordinated manner to make them more active and flexible, in addition to increasing their operationalefficiency. In our case, we studied the functions associated with the reconfiguration problem, thevoltage control problem and the hybridization of these two, while taking into account the presence ofthe DG. Based on the inherent components of network physical models, several models have beenproposed. Some are derived from the graph theory and others use powerful mathematicalreformulation to make our models convex. The adopted models answer to the necessity of taking intoaccount all regulation means, which can be discrete (On Load Tap-Changer and capacitor banks),binary (components connectivity such as lines or transformers) and continuous (DG reactive power ),and by the choice of tools and algorithms of mixed optimization. Indeed, the complexity of theseproblems is such that we have explored both algorithms: meta-heuristic (ACA, Ant Colony Algorithm)and deterministic (Generalized Benders Decomposition, Branch and Cut Algorithm)

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Huet, Lila. "Role of electric flexibility in the future French grid with high renewable integration." Thesis, KTH, Energiteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263063.

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The operation of electric grids depends on the balance between the electric generation and the demand. In France, the Transmission System Operator, RTE, is responsible for the stability and the security of the grid. Today, the electric generation follows the variations of the demand. However, environmental concerns prompt to develop new strategies and policies for Energy Transition. The development of Smart Grids, the uncertain future of nuclear generation, the massive integration of renewable sources are the focus of those. Furthermore, renewable energies generation is intermittent and can not be controlled. The current strategy for the balance between generation and demand is challenged. The electric grid has to be readjusted by adding more electric flexibility to ensure its stability. The electric flexibility is usually associated to storage technologies as batteries or pumping stations. A state of art review is used to define this notion and to evaluate the technological and economic maturity of different electric flexibility vectors. The following report is based on a selection of prospective scenarios, development plans already launched in France, proposing a significant share of renewable energies in a future energy mix and current French energy data. Two studies were carried out : one at a regional level, for Bretagne and one at national level for France. An evaluation at 2050 is carried out to determine the load factors of intermittent energies, consumption and residual demand in Bretagne. On the basis of these prospective estimates, a need for electric flexibility can be determined for the Bretagne region. This first study highlights an issue related to future needs for electric flexibility. However, since the balance between production and consumption is achieved at a national level, a second study on France is necessary. The French need for electric flexibility is then estimated through a linear optimization that evaluates the energy production required to achieve a generation/consumption balance taking into account energy sources merit order.
Det franska elnätets funktion beror på balansen mellan elproduktionen och efterfrågan. Transmissionssystemoperatören, RTE, ansvarar för nätets stabilitet och säkerhet. Idag följer den elektriska generationen variationerna i efterfrågan. Miljömässiga frågor är emellertid snabba för att utveckla nya strategier och strategier för energiövergång. Utvecklingen av Smart Grids, den osäkra framtiden för kärnkraftsproduktion, den massiva integrationen av förnybara källor är deras fokus. Vidare är generering av förnybara energikällor intermittent och kan inte kontrolleras. Den nuvarande strategin för balans mellan produktion och efterfrågan utmanas. Elnätet måste justeras genom att lägga till mer elektrisk flexibilitet för att säkerställa stabiliteten. Den elektriska flexibiliteten är vanligtvis förknippad med lagringsteknik som batterier eller pumpstationer. En allmänt erkända tekniska används för att definiera denna uppfattning och att utvärdera den tekniska och ekonomiska mognaden hos olika elektriska flexibilitetsvektorer. Följande undersökningar grundar sig på ett urval av framtida scenarier, utvecklingsplaner som redan lanserats i Frankrike, och föreslår en betydande andel förnybara energikällor i en framtida energimix och nuvarande franska energidata. Två studier utfördes på olika perimetrar: på Bretagne-regionen och i Frankrike. En utvärdering vid 2050 utförs för att bestämma belastningsfaktorerna för intermittent energi, förbrukning och återstående efterfrågan i Bretagne. På grundval av dessa framtida uppskattningar kan ett behov av elektrisk flexibilitet bestämmas för Bretagne-regionen. Denna första studie lyfter fram ett problem som rör framtida behov av elektrisk flexibilitet. Men eftersom balansen mellan produktion och konsumtion uppnås på nationell nivå krävs en andra studie om Frankrike. Det franska behovet av elektrisk flexibilitet uppskattas sedan genom en linjär optimering som utvärderar den energiproduktion som krävs för att uppnå en generation / konsumtionsbalans med hänsyn tagen till energikällans meriteringsordning.
Le fonctionnement du réseau électrique français repose sur l’équilibre entre la production et la consommation d’électricité. Le gestionnaire du réseau de transport, RTE, est responsable de la stabilité et de la sécurité du réseau. Aujourd’hui, la production électrique s’adapte aux variations de la consommation. Cependant, des préoccupations environnementales incitent à la mise en place de nouvelles stratégies et politiques pour la transition énergétique. Le développement d’un réseau intelligent, l’avenir incertain du nucléaire et l’intégration massive d’énergies renouvelables sont au centre de celles-ci. De plus, la production électrique des énergies renouvelables s’avère intermittente et fatale. La stratégie actuelle du maintien de l’équilibre production/consommation est remise en question. Le système électrique doit être repensé en y intégrant plus de flexibilité électrique pour en garantir la stabilité. La flexibilité électrique est usuellement associée aux technologies de stockage comme les batteries électrochimiques et les STEP hydrauliques. Un état de l’art permet de définir précisément cette notion et d’évaluer la maturité technologique et économique en France de ces différents vecteurs de flexibilité électrique. L’objet des recherches suivantes est basé sur une sélection de scénarios prospectifs, de plans de développement d’ores et déjà lancés en France, proposant une part importante d’énergies renouvelables dans un futur mix énergétique et des données énergétiques actuelles françaises. Deux études ont été menées sur différents périmètres : sur la région Bretagne et sur la France entière. Une évaluation à 2050 est effectuée pour déterminer facteurs de charge des énergies intermittentes, consommation et demande résiduelle en Bretagne. A partir de ces estimations prospectives, un besoin en flexibilité peut être déterminé sur le périmètre de la Bretagne. Cette première étude permet de mettre en exergue une problématique liée aux futurs besoins de flexibilité électrique. Cependant, l’équilibre entre production et consommation étant réalisé à un niveau national, une seconde étude sur le périmètre français est nécessaire. Le besoin français en flexibilité est alors estimé par le biais d’une optimisation linéaire qui évalue la production énergétique nécessaire pour obtenir un équilibre production/consommation en tenant compte de la préséance économique.

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Moulard, Laurence. "Optimisation de maillages non structurés : applications à la génération, à la correction et à l'adaptation." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10173.

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Nous traitons les problèmes lies aux maillages non structures par des méthodes d'optimisation utilisant des algorithmes d'exploration locale. Le principe consiste à partir d'une solution existante et a l'améliorer grâce a des opérations élémentaires. L'intérêt de cette approche est de pouvoir modifier localement la solution initiale pour qu'elle réponde a des contraintes ou des critères qui peuvent évoluer. On évite ainsi la reconstruction couteuse d'un nouveau maillage à chaque nouvelle demande des utilisateurs
Une étude théorique introduit de nouveaux objets, les tétraphores réalisables, en considérant les seules conditions topologiques d'un maillage. Ces objets se construisent facilement à partir de la frontière du domaine à mailler ; il suffit d'ajouter des contraintes géométriques, très simples à tester et pouvant se traduire sous la forme d'un critère à optimiser, pour obtenir un maillage. Des opérations transformant ces tétraphores sont définies. Les algorithmes d'optimisation sont ainsi bien plus efficaces car ils peuvent être appliques sur un ensemble plus vaste que les maillages
Les algorithmes décrits dans cette thèse sont utilisés industriellement. Des résultats sont donnes pour l'optimisation selon des critères géométriques et topologiques, l'adaptation selon un critère de densité, la correction après déformation des frontières et la génération de maillages

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Belhadji, Lakhdar. "Optimisation du contrôle commande d'un système hydraulique réversible à vitesse variable." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00881633.

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Le but de cette thèse est l'optimisation du contrôle commande d'un système hydraulique réversible à vitesse variable. L'approche est d'abord traitée par simulation dynamique pour finir ensuite par validation expérimentale sur maquette physique temps réel hybride basée sur l'émulation (PHIL). La partie simulation concerne la modélisation des différents éléments de la microcentrale hydraulique tel que la turbine, la génératrice et l'interface d'électronique de puissance ainsi que le développement des lois de commande et la synthèse des différents régulateurs. Deux stratégie de contrôle ont été étudié, la première dite commande en vitesse associé à un algorithme MPPT adaptatif développé au cours de la thèse et la deuxième dite en puissance. Le management des contrôles commandes pour assurer la fonction de secours (backup) de la microcentrale hydraulique a été simulé et validé expérimentalement. Et enfin la transition rapide entre les deux modes de fonctionnement d'une petite station de transfert d'énergie par pompage a été proposé et validé par émulation sur la maquette physique.

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Books on the topic "Grid generation; Grid solving; Optimisation"

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R, Wiese Michael, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., eds. Interactive algebraic grid-generation technique. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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A multistage mesh generator for solving the average-passage equation system. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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Center, Ames Research, ed. Generation of three-dimensional body-fitted grids by solving hyperbolic partial differential equations. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1989.

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Center, Ames Research, ed. Generation of three-dimensional body-fitted grids by solving hyperbolic partial differential equations. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1989.

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Center, Ames Research, ed. Generation of three-dimensional body-fitted grids by solving hyperbolic partial differential equations. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1989.

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Center, Ames Research, ed. Generation of three-dimensional body-fitted grids by solving hyperbolic partial differential equations. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1989.

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United States. National Aeronautics and Space Administration., ed. A combined geometric approach for solving the Navier-Stokes equations on dynamic grids. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. A combined geometric approach for solving the Navier-Stokes equations on dynamic grids. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "Grid generation; Grid solving; Optimisation"

1

Morris, M. R. "Two Dimensional Multi-Block Grid Optimisation by Variational Techniques." In Multiblock Grid Generation, 189–98. Wiesbaden: Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-322-87881-6_20.

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Horne, A. F. E. "Adaptive Mesh Generation within a 2D CFD Environment Using Optimisation Techniques." In Multiblock Grid Generation, 179–88. Wiesbaden: Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-322-87881-6_19.

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Khan, Baseem, Esayas Gidey, Habtamu Getachew, and Hassan Haes Alhelou. "Managing the generation and demand inside the smart-grid structure." In Solving Urban Infrastructure Problems Using Smart City Technologies, 433–45. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-816816-5.00020-6.

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Boero, R. "The Grid for Nature-Inspired Computing and Complex Simulations." In Handbook of Research on Nature-Inspired Computing for Economics and Management, 171–82. IGI Global, 2007. http://dx.doi.org/10.4018/978-1-59140-984-7.ch013.

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This chapter deals with the usage of grid technologies for nature-inspired algorithms and complex simulations. After shortly introducing the grid and its technological state of the art, some features are pointed out in order to set the boundaries of the applicability of such new technology to the matters of interest. Then two paragraphs show some possible usages of grid technologies. The first one introduces the master-worker paradigm as a conceptual and technological scheme that helps in solving issues related to dynamic optimisation via nature-inspired algorithms and in exploring the parameters space of complex simulations. The following paragraph concerns two other points: the possibility to distribute agents of agent-based simulations using multi-agent systems; and the boundaries, architectures, and advantages in distributing parts of complex simulations which are heavy from the computational point of view. The chapter, as a whole, acts as a guide presenting applicative ideas and tools to exploit grid technological solutions for the considered purposes.

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Cuzzocrea, Alfredo, Marcel Karnstedt, Manfred Hauswirth, Kai-Uwe Sattler, and Roman Schmidt. "Estimating the Completeness of Range Queries over Structured P2P Databases." In Next Generation Content Delivery Infrastructures, 251–81. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-1794-0.ch011.

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Range queries are a very powerful tool in a wide range of data management systems and are vital to a multitude of applications. The hierarchy of structured overlay systems can be utilized in order to provide efficient techniques for processing them, resulting in the support of applications and techniques based on range queries in large-scale distributed information systems. On the other hand, due to the rapid development of the Web, applications based on the P2P paradigm gain more and more interest, having such systems started to evolve towards adopting standard database functionalities in terms of complex query processing support. This goes far beyond simple key lookups, as provided by standard distributed hashtables (DHTs) systems, which makes estimating the completeness of query answers a crucial challenge. Unfortunately, due to the limited knowledge and the usually best-effort characteristics, deciding about the completeness of query results, e.g., getting an idea when a query is finished or what amount of results is still missing, is very challenging. There is not only an urgent need to provide this information to the user issuing queries, but also for implementing sophisticated and efficient processing techniques based on them. In this chapter, the authors propose a method for solving this task. They discuss the applicability and quality of the estimations, present an implementation and evaluation for the P-Grid system, and show how to adapt the technique to other overlays. The authors also discuss the semantics of completeness for complex queries in P2P database systems and propose methods based on the notion of routing graphs for estimating the number of expected query answers. Finally, they discuss probabilistic guarantees for the estimated values and evaluate the proposed methods through an implemented system.

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Conference papers on the topic "Grid generation; Grid solving; Optimisation"

1

Lad, B., L. He, and E. Romero. "Validation of the Immersed Mesh Block (IMB) Approach Against a Cooled Transonic Turbine Stage." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68779.

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Due to difficulties associated with directly meshing and solving cooled turbine geometries, evaluation of cooling designs at an early design stage is not practical. This results in a severely disjointed aerodynamic and heat transfer design process and affects turbine optimisation. In order to reduce the time cost of evaluating cooled geometries, the Immersed Mesh Block (IMB) approach was previously proposed. The IMB is an independent, high density cooling hole mesh that can be mapped to the surface of a turbine and solved with two-way coupling within hours, thus allowing cooling holes to be consistently and reliably modelled at an early design stage. The main focus of this paper is to validate the IMB approach by comparing its results of a cooled transonic NGV against experimental data. Prior to this, a series of mesh dependency tests are conducted on the base solver for a turbine stage. These highlight the need for greater rigour in mesh generation for RANS predictions of heat transfer over aerodynamics. The effect of mesh density on cooling hole predictions is then considered; a range of meshes are employed to model a row of holes on a flat plate. Hence the need for high resolution meshes for cooled geometries is emphasised. Subsequently, it is demonstrated that grid dependency studies of cooling holes on the turbine surface can easily be conducted with the IMB approach. Finally, the IMB method is validated by comparison of its results to experimental data for a cooled turbine stage. The results show that the IMB predicted Nusselt number distribution agrees well with experimental data.

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Reynolds, Jonathan, Muhammad Waseem Ahmad, and Yacine Rezgui. "District Heating Energy Generation Optimisation Considering Thermal Storage." In 2018 IEEE International Conference on Smart Energy Grid Engineering (SEGE). IEEE, 2018. http://dx.doi.org/10.1109/sege.2018.8499509.

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Guo, Feng-de. "Study on SPLL of Grid-connected PV generation system." In 2012 International Conference on Computational Problem-Solving (ICCP). IEEE, 2012. http://dx.doi.org/10.1109/iccps.2012.6384296.

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Vermeulen, V., J. M. Strauss, and H. J. Vermeulen. "Optimisation of the allocation of solar PV generation capacity using grid support objectives." In 2017 IEEE PES/IAS PowerAfrica. IEEE, 2017. http://dx.doi.org/10.1109/powerafrica.2017.7991224.

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Werner, M., F. Grundl, M. Finkel, and M. Wiest. "Optimisation of HV/MV-transformer-voltage-control in distribution networks with a high proportion of distributed generation." In CIRED 2012 Workshop: Integration of Renewables into the Distribution Grid. IET, 2012. http://dx.doi.org/10.1049/cp.2012.0734.

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Kim, Byungsang, Dukyun Nam, Young-Kyoon Suh, June Hawk Lee, Kumwon Cho, and Soonwook Hwang. "Application Parameter Description Scheme for Multiple Job Generation in Problem Solving Environment." In Third IEEE International Conference on e-Science and Grid Computing (e-Science 2007). IEEE, 2007. http://dx.doi.org/10.1109/e-science.2007.13.

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Jun, Zhou, and Yukio Umetani. "A Problem Solving Environment for Automatic Matlab 3D Finite Element Code Generation and Simplified Grid Computing." In 2006 Second IEEE International Conference on e-Science and Grid Computing. IEEE, 2006. http://dx.doi.org/10.1109/e-science.2006.261183.

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Gomes, E. E. B., P. Pilidis, and A. L. Polyzakis. "Short-Term Generation Schedule Optimisation for Combined Heat and Power." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63083.

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In the last decades one of the most difficult problems in the electricity market has been how to dispatch and manage the electricity in power generation plants. Despite of all the benefits of distributed poly-generation and combined heat and power systems, their penetration in the power market worldwide is quite modest and one of the barriers against their increasing participation is the high fees for back-up supplies, which is one of the problems addressed in this investigation. This paper introduces a pool of distributed generation units (named nerve-centre) able to economically optimise the generation schedule of gas turbine power plants and end-users interconnected through a mini-grid. A hybrid genetic algorithm adapted priority list was developed to solve the multi unit generation schedule optimisation problem. The algorithm developed in this study leads the optimisation mechanism to a faster convergence and a very low risk of non-convergence to the optimal result. Despite the power generation optimisation studies reported in the technical literature, none of them has been modelled for such a pool of distributed generators trading electricity in the competitive market. This investigation shows that the proposed nerve-centre concept can result in significant savings to generators/end-users.

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Shahpar, Shahrokh, David Giacche, and Leigh Lapworth. "Multi-Objective Design and Optimisation of Bypass Outlet-Guide Vanes." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38700.

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This paper describes the development of an automated design optimization system that makes use of a high fidelity Reynolds-Averaged CFD analysis procedure to minimize the fan forcing and fan BOGV (bypass outlet guide vane) losses simultaneously taking into the account the down-stream pylon and RDF (radial drive fairing) distortions. The design space consists of the OGV’s stagger angle, trailing-edge recambering, axial and circumferential positions leading to a variable pitch optimum design. An advanced optimization system called SOFT (Smart Optimisation for Turbomachinery) was used to integrate a number of pre-processor, simulation and in-house grid generation codes and postprocessor programs. A number of multi-objective, multi-point optimiztion were carried out by SOFT on a cluster of workstations and are reported herein.

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Lakkis, Issam. "Grid-Free Vortex Methods for Natural Convection in Two-Dimensional Domains." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86103.

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Vortex methods for simulating natural convection of an ideal gas in unbounded two-dimensional domains are presented. In particular, the redistribution method for diffusion is extended to enable simulation of nonlinear diffusion of an ideal gas in isobaric conditions encountered in unbounded low-Mach number flows. We also address the problem of handling source terms in grid-free vortex methods and propose a fast, accurate, and physically motivated method for solving the associated inverse problems. Examples include generation of baroclinic vorticity in non-reacting buoyancy driven flows, and in addition, generation of internal energy and species in buoyant reacting flows. Accuracy and speed of the proposed algorithms for nonlinear diffusion and vorticity generation are investigated separately. Simulations of natural convection of a “thermal patch” for Grashof number ranging from to 1562.5 to 25000 are presented.

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