Academic literature on the topic 'Numerica Modeling'

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Journal articles on the topic "Numerica Modeling"

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Schoen, F., P. Van Henternryck, L. Michel, and Y. Deville. "Numerica A Modeling Language for Global Optimisation." Journal of the Operational Research Society 49, no. 11 (November 1998): 1228. http://dx.doi.org/10.2307/3010111.

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Schoen, F. "Numerica A Modeling Language for Global Optimisation." Journal of the Operational Research Society 49, no. 11 (November 1998): 1228. http://dx.doi.org/10.1057/palgrave.jors.2600041.

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Schoen, F. "Numerica A -- Modeling Language for Global Optimisation." Journal of the Operational Research Society 49, no. 11 (1998): 1228. http://dx.doi.org/10.1038/sj.jors.2600041.

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Carrillo, Mauricio, Juan Bazo, Octavio Fashe, Martin Calvo, Jaime Torres, Manuel Sullón, and Walter Molina. "SIMULACION NUMERICA DE LLUVIAS EN EL NORTE DEL PERU." Revista de Investigación de Física 9, no. 01 (July 17, 2006): 82–90. http://dx.doi.org/10.15381/rif.v9i01.8622.

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Lluvias extremas se han observado en el norte del Perú, el impacto de estas lluvias sobre la infraestructura presente en las ciudades es importante, esto debido a la alta vulnerabilidad de la zona. Los eventos ocurren principalmente en verano. Por lo tanto, se han seleccionado catorce casos de lluvia extrema, las que se registraron durante diciembre y marzo del 2001 y 2002. En la presente investigación se realiza una evaluación de la simulación numérica de lluvias en el norte del Perú. Se empleo un modelo regional atmosférico llamado RAMS (Regional Atmosphere Modeling System) el cual ha sido implementado en la zona norte del Perú usando la técnica de anidamiento para reducir la resolución. La evaluación de la simulación de lluvias es realizada midiendo la correlación entre las lluvias registradas y las simuladas por el modelo RAMS. Los resultados muestran una mayor correlación para la cuenca alta, un valor intermedio de correlación para la cuenca media, y los menores valores de correlación se observa en la zona baja de la cuenca. Estos valores para la cuenca alta, media y baja son: 0.49, 0.44, y 0.15 respectivamente. Aunque estos valores son aparentemente bajos, se ha presentado valores de correlación de 0.90 para la cuenca baja de la cuenca, al simular todo el evento de lluvia extrema. También valores de correlación de 0.94 fue observada en la parte alta de la cuenca. Se mencionan algunas explicaciones de los bajos valores de correlación, así como algunas medidas de mejora en los sistemas de adquisición de datos.
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Mantilla, Irla, and Carlos Masgo. "SIMULACIÓN NUMERICA DEL PROCESO DE INFECCION TRATAMIENTO DEL VIH1 Y SU CONTROL BAJO LA ACCIÓN DE ANTIRRETROVIRALES." Revista Cientifica TECNIA 25, no. 1 (January 29, 2017): 71. http://dx.doi.org/10.21754/tecnia.v25i1.25.

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En este trabajo se considera la propuesta, desarrollo y simulación numérica de un sistema que modela el comportamiento del tratamiento del VIH-1, utilizando antirretrovirales. El sistema definido para tres variables dependientes de la variable t, denotadas por X(t)= (x1(t), x2(t), x3(t)) representan a la cantidad de Linfocitos T "Helpers" (CD4), cantidad de Linfocitos T Citotóxicos (CD8) y Carga Viral del proceso de infección del VIH-1 en cualquier instante de tiempo t, respectivamente. El sistema conformado por un conjunto de Ecuaciones Diferenciales Ordinarias No lineales, cuyo dominio existencial del sistema representa el tiempo de evaluación del proceso de infección y eliminación del virus en un paciente con VIH-1. Este conjunto de estados del Sistema Dinámico No lineal, asociado a las condiciones de valor inicial es denominado Problema de Cauchy. Existen pocos estudios relacionados a la solución de este sistema, de los encontrados algunos se reducen al estudio en dos variables y otros sin la obtención de la solución explícita. En el presente trabajo se contribuye con el estudio del sistema para tres variables, y un análisis cualitativo y cuantitativo que comprende: linealización, diagrama de fase, estabilidad cualitativa, existencia y unicidad de solución analítica, donde se prueba una equivalencia de la solución del sistema no lineal a la del sistema linealizado. La equivalencia está basada en el Teorema de Grobman – Hartman y se encuentra la solución explícita mediante el método de Runge Kutta de 4to orden. De este modo se obtienen los resultados del modelo y cuya convergencia, está garantizada por la consistencia y estabilidad del esquema numérico. Palabras clave.- Tratamiento antirretroviral, Modelamiento matemático VIH, Sistema dinámico no lineal, Método de Runge Kutta de cuarto orden. ABSTRACTThis paper considers the proposal, development and numerical simulation of a system that models the behavior of the treatment of HIV-1 using antiretrovirals. The system defined for three dependent variables of the variable t, denoted by X(t)=(x1 (t), x2 (t), x3 (t)) represent the amount of T Lymphocytes "Helpers" (CD4), number of Cytotoxic T Lymphocytes (CD8) Viral load and infection process of HIV-1 at any time t, respectively. The assembly consists of a Nonlinear Ordinary Differential Equations system whose existential domain represents time system evaluation process of infection and viral clearance in a patient with HIV-1. This set of states of Nonlinear Dynamic System, associated with the initial value condition is called Cauchy problem. There are few studies related to the solution of this system, found some of the study are reduced to two variables and others without obtaining the explicit solution. Equivalence of the solution of the system linearization, phase diagram, qualitative stability, existence and uniqueness of analytic solution, where test: In this paper contributes to the study of the system for three variables, and qualitative and quantitative analysis comprising nonlinear the linearized system. The equivalence is based on Theorem Grobman - Hartman and explicit solution by the Runge Kutta 4th order, thus the model results and whose convergence is obtained is, is guaranteed by the consistency and stability of the numerical scheme. Keywords.- Antiretroviral therapy, HIV mathematical modeling, Nonlinear dynamic system, Runge Kutta method of fourth order.
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Makokha, Mary, Akira Kobayashi, and Shigeyasu Aoyama. "Numerical Modeling of Seawater Intrusion Management Measures." Journal of Rainwater Catchment Systems 14, no. 1 (2008): 17–24. http://dx.doi.org/10.7132/jrcsa.kj00004978338.

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O. B. Silva, Augusto, Newton O. P. Júnior, and João A. V. Requena. "Numerical Modeling of a Composite Hollow Vierendeel-Truss." International Journal of Engineering and Technology 7, no. 3 (June 2015): 176–82. http://dx.doi.org/10.7763/ijet.2015.v7.788.

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ADETU, Alina-Elena, Cătălin ADETU, and Vasile NĂSTĂSESCU. "NUMERICAL MODELING OF ACOUSTIC WAVE PROPAGATION IN UNLIMITED SPACE." SCIENTIFIC RESEARCH AND EDUCATION IN THE AIR FORCE 21, no. 1 (October 8, 2019): 80–87. http://dx.doi.org/10.19062/2247-3173.2019.21.12.

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ITO, Yusuke, Toru KIZAKI, Naohiko SUGITA, and Mamoru MITSUISHI. "1206 Numerical Modeling of Picosecond Laser Drilling of Glass." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2015.8 (2015): _1206–1_—_1206–5_. http://dx.doi.org/10.1299/jsmelem.2015.8._1206-1_.

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Troyani, N., L. E. Montano, and O. M. Ayala. "Numerical modeling of thermal evolution in hot metal coiling." Revista de Metalurgia 41, Extra (December 17, 2005): 488–92. http://dx.doi.org/10.3989/revmetalm.2005.v41.iextra.1082.

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Dissertations / Theses on the topic "Numerica Modeling"

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Villa, A. "Three dimensional geophysical modeling : from physics to numerical simulation." Doctoral thesis, Università degli Studi di Milano, 2010. http://hdl.handle.net/2434/148440.

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The main objective of this thesis is to provide a comprehensive numerical tool for the three-dimensional simulation of sedimentary basins. We have used a volume averaging technique to obtain a couple of basin-scale mathematical models. We have used some innovative numerical techniques to deal with such models. A multi-fluid implicit tracking technique is developed and integrated with a Stokes solver that is robust with respect to the variations of the coefficients. The movement of the basin boundaries and the evolution of the faults are treated with an Ale and a Finite Volume scheme respectively. Also some mesh refinement methods are used to guarantee a sufficient accuracy. The numerical experiments show a good qualitative agreement with the measured geometry of the sedimentary layers. (Pubblicata - vedi http://hdl.handle.net/2434/148441)
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De, Martino Giuseppe. "Multi-Value Numerical Modeling for Special Di erential Problems." Doctoral thesis, Universita degli studi di Salerno, 2015. http://hdl.handle.net/10556/1982.

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2013 - 2014
The subject of this thesis is the analysis and development of new numerical methods for Ordinary Di erential Equations (ODEs). This studies are motivated by the fundamental role that ODEs play in applied mathematics and applied sciences in general. In particular, as is well known, ODEs are successfully used to describe phenomena evolving in time, but it is often very di cult or even impossible to nd a solution in closed form, since a general formula for the exact solution has never been found, apart from special cases. The most important cases in the applications are systems of ODEs, whose exact solution is even harder to nd; then the role played by numerical integrators for ODEs is fundamental to many applied scientists. It is probably impossible to count all the scienti c papers that made use of numerical integrators during the last century and this is enough to recognize the importance of them in the progress of modern science. Moreover, in modern research, models keep getting more complicated, in order to catch more and more peculiarities of the physical systems they describe, thus it is crucial to keep improving numerical integrator's e ciency and accuracy. The rst, simpler and most famous numerical integrator was introduced by Euler in 1768 and it is nowadays still used very often in many situations, especially in educational settings because of its immediacy, but also in the practical integration of simple and well-behaved systems of ODEs. Since that time, many mathematicians and applied scientists devoted their time to the research of new and more e cient methods (in terms of accuracy and computational cost). The development of numerical integrators followed both the scienti c interests and the technological progress of the ages during whom they were developed. In XIX century, when most of the calculations were executed by hand or at most with mechanical calculators, Adams and Bashfort introduced the rst linear multistep methods (1855) and the rst Runge- Kutta methods appeared (1895-1905) due to the early works of Carl Runge and Martin Kutta. Both multistep and Runge-Kutta methods generated an incredible amount of research and of great results, providing a great understanding of them and making them very reliable in the numerical integration of a large number of practical problems. It was only with the advent of the rst electronic computers that the computational cost started to be a less crucial problem and the research e orts started to move towards the development of problem-oriented methods. It is probably possible to say that the rst class of problems that needed an ad-hoc numerical treatment was that of sti problems. These problems require highly stable numerical integrators (see Section ??) or, in the worst cases, a reformulation of the problem itself. Crucial contributions to the theory of numerical integrators for ODEs were given in the XX century by J.C. Butcher, who developed a theory of order for Runge-Kutta methods based on rooted trees and introduced the family of General Linear Methods together with K. Burrage, that uni ed all the known families of methods for rst order ODEs under a single formulation. General Linear Methods are multistagemultivalue methods that combine the characteristics of Runge-Kutta and Linear Multistep integrators... [edited by Author]
XIII n.s.
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Ferrari, Giacomo <1989&gt. "A Numerical Proposal of an Extended Solid Modeling System." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/7858/1/Ferrari_Giacomo_Tesi.pdf.

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This thesis has been carried out at the Department of Mathematics of the University of Bologna and at the Company HyperLean s.r.l. spin-off of the University Polytechnic of Marche, as part of a collaborative project on "Theoretical and numerical aspects of a hybrid geometric modeling system". The key observation that motivates the interest in this topic is that in different application contexts you have the need to create virtual solid models that integrate real data acquired by 3D scanning, represented by polygonal meshes, with synthetic models, designed by parametric/analytical multi-patches. The research topic covered the study of theoretical and numerical aspects of solid modeling and the development of suitable solutions as part of a "hybrid geometric solid modeling system". In particular, the involvement as regards the professional side of the project covered the development of algorithms for the optimization of the 3D geometry of solid objects and boolean operations between polygonal meshes to improve the LeanCost software (HyperLean's proprietary software). Concerning the academic side, we investigated many aspects of solid modeling, focusing on the B-Rep models and introducing the new paradigm "Extended B-Rep" which is able to integrate "mesh-faces" as part of a B-rep model. To manage the quality of the built model we studied a notion of continuity and join between parametric and discrete representations and we proposed a set of methods that guarantee that the models can be manipulated while maintaining predetermined continuity constraints among the constituent parts. We generalized the most important tools of solid modeling to the Extended B-Reps and proposed solutions to extend the geometric kernels of standard solid modeling systems tobe able to deal with Extended B-rep models. The new geometric solid modeling kernel has been realized in a software supported by the OpenCascade library.
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ZANELLA, Mattia. "Boltzmann-type and mean-field modeling of social dynamics: numerics, control, uncertainty quantification." Doctoral thesis, Università degli studi di Ferrara, 2017. http://hdl.handle.net/11392/2488037.

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Scopo del presente lavoro è proporre un approccio inedito per i modelli di sistemi complessi, sia in caso deterministico che stocastico, con particolare attenzione a metodi numerici, metodologie di controllo e di quantificazione dell’incertezza. Nel Capitolo 1 introduciamo un controllo di tipo Boltzmann per dinamiche di consenso. Tale metodo è basato su equazioni microscopiche a sulla tecnica del model predictive control (MPC) per il controllo instantaneo. Nel Capitolo 2 applichiamo un approccio di tipo MPC nel contesto di reti complesse, dove il controllo agisce sui nodi/agenti influenzando la dinamica dell’intera rete. Osserviamo come l’introduzione di un appropriato termine di selezione, dipendente dal grado di connessione di ogni nodo, riesca a portare l’opinione del sistema di agenti verso il consenso. Il Capitolo 3 riguarda la derivazione di limiti di performace per il controllo MPC nel caso di equazioni di campo medio a orizzonte di controllo variabile. Abbiamo qui dimostrato l’esistenza di tali limiti sulla differenza nel funzionale di costo MPC e di dinamiche con controllo ottimo. Nel Capitolo 4 abbiamo sviluppato schemi numerici per la conservazione delle proprietà strutturali di equazioni di campo medio come: non-negatività, dissipazione dell’entropia e stati di equilibrio. I metodi sono accurati al second’ordine, non richiedono alcuna restrizione di discretizzazione e catturano lo stato stazionario con accuratezza arbitraria. Tali proprietà sono essenziali per una descrizione fisicamente corretta del problema. Abbiamo proposto qui alcune applicazioni a equazioni di tipo Fokker-Planck non-lineari che emergono in modelli di comportamento collettivo tipici delle scienze socio-economiche e della vita. Nel Capitolo 5 gli schemi del capitolo precedente sono applicate a un modello multivariato per dinamiche di opinione su reti complesse, dove le interazioni dipendono dall’opinione stessa e dal numero di connessioni di ogni agente. La generazione di network a partire da un master equation è stata trattata analiticamente dimostrando l’emergenza di distribuzioni stazionarie scale-free o di grafi uniformi. Inoltre, si osserva come la presenza di una porzione di nodi altamente connessi nel grafo forzi la dinamica verso l’opinione di tali agenti. Il Capitolo 6 è dedicato alla costruzione di un modello multivariato per le scienze decisionali. In particolare, introduciamo modelli di tipo cinetico per l’influenza della competenza nell’evoluzione di decisioni in sistemi multi-agente. Il meccanismo di scambio include la tendenza degli agenti a comportarsi come se fossero capaci, o incapaci, al pari del loro partner: fenomeno chiamato equality-bias. Il modello è ispirato da misurazioni empiriche ed è in grado di riprodurre i risultati sperimentali. L’azione di quantità stocastiche sulla dinamica è oggetto del Capitolo 7. Qui consideriamo interazioni soggette a incertezza per il modello di Cucker-Smale utilizzando tecniche di caos polinomiale. Osserviamo come la presenza di code negative nella distribuzione del parametro casuale porti alla divergenza in tempo finito del valore atteso delle velocità del sistema anche in regimi di flocking incondizionato. Un controllo selettivo MPC è poi introdotto per stabilizzare la dinamica e guidare le velocità attese verso una quantità desiderata anche in regimi di divergenza. Il Capitolo 8 è parte di un lavoro in corso di svolgimento. Abbiamo derivato equazioni di tipo campo medio dal modello microscopico di Cucker-Smale con stocasticità. Proponiamo inoltre un nuovo schema numerico che conserva le proprietà strutturali, basato sia su tecniche Monte Carlo che di tipo Galerkin-gPC stocastiche. Test numerici mostrano come tale schema mantenga l’accuratezza spettrale per le quantità statistiche come media e varianza.
The aim of the present manuscript is to investigate a novel perspective in the modeling and control of complex system both in the deterministic and stochastic case, with particular attention to numerical methods, control methodologies and uncertainty quantification. In Chapter 1 we construct a Boltzmann--type control of a consensus dynamics. Based on a microscopic model we design a Boltzmann-type optimal control thanks to the model predictive control (MPC) approach in the case of an instantaneous control. In Chapter 2 we apply the MPC control approach in the context of complex networks where a control acts over a minimum set of nodes/agents influencing the dynamics of the whole network. We observed how the introduction of a suitable selective control depending on the connection degree of each node is capable of driving the overall opinion towards consensus. Chapter 3 regards the derivation of performance bounds for mean--field MPC control with varying horizon. Here we have established a computable and provable bound on the difference in the cost functional for MPC-controlled and optimally controlled dynamics in the case of a large number of agents. In Chapter 4 we developed numerical schemes that conserve structural property of mean--field equations: non--negativity of the solution, entropy dissipation and large time behavior. The methods here developed are second order accurate, they do not require any restriction on the mesh size and are capable to capture the asymptotic steady states with arbitrary accuracy. These properties are essential for a correct description of the underlying physical problem. Applications of the schemes to several nonlinear Fokker-Planck equations describing emerging collective behavior in socio-economic and life sciences are presented. We further applied in Chapter 5 the developed numerical techniques to a multivariate non--local model for opinion dynamics over complex network, where interactions depend on the opinion itself and on the discrete number of connections. It has been proven that for different choices of weights functions the introduced generator of the network may produce stationary scale-free degree distributions as well as uniform random graphs. Further, we observed that the presence of a small portion of highly connected agents may drive the overall dynamics towards their position. In Chapter 6 we further investigate multivariate models with a direct application to decision science. In particular, we introduce and discuss multivariate kinetic models describing the influence of competence in the evolution of decisions in a multiagent system. The exchange mechanism includes the role of the agents’ tendency to behave in the same way as if they were as good, or as bad, as their partner: the so-called equality bias. The presented modeling is inspired by real experiments and reproduces the empirical findings. The role of stochastic quantities in the dynamics is investigated in Chapter 7. Here we analyze the effect of the uncertainty in the interaction parameter in a second-order alignment model of the Cucker-Smale type using a generalized polynomial chaos approach. We observed that the presence of negative tails in the distribution of the random inputs lead to the divergence of the expected velocities of the system of agents, even in the regimes of unconditional flocking. We formalized a selective MPC approach to stabilize the dynamics and to steer the expected velocities toward the desired one, even in the divergence regimes. Chapter 8 is part of an ongoing work. Here we derived mean-field equations from microscopic Cucker-Smale type model dependent on random input in several cases. Further, a novel structure preserving numerical technique based on both Monte Carlo and stochastic Galerkin-gPC methods is addressed. Numerical experiments show that the scheme maintain the spectral accuracy for the statistical quantities of interest, like mean and variance.
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Rucci, Marco. "Geometric Surface Processing and Virtual Modeling." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3426305.

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In this work we focus on two main topics "Geometric Surface Processing" and "Virtual Modeling". The inspiration and coordination for most of the research work contained in the thesis has been driven by the project New Interactive and Innovative Technologies for CAD (NIIT4CAD), funded by the European Eurostars Programme. NIIT4CAD has the ambitious aim of overcoming the limitations of the traditional approach to surface modeling of current 3D CAD systems by introducing new methodologies and technologies based on subdivision surfaces in a new virtual modeling framework. These innovations will allow designers and engineers to transform quickly and intuitively an idea of shape in a high-quality geometrical model suited for engineering and manufacturing purposes. One of the objective of the thesis is indeed the reconstruction and modeling of surfaces, representing arbitrary topology objects, starting from 3D irregular curve networks acquired through an ad-hoc smart-pen device. The thesis is organized in two main parts: "Geometric Surface Processing" and "Virtual Modeling". During the development of the geometric pipeline in our Virtual Modeling system, we faced many challenges that captured our interest and opened new areas of research and experimentation. In the first part, we present these theories and some applications to Geometric Surface Processing. This allowed us to better formalize and give a broader understanding on some of the techniques used in our latest advancements on virtual modeling and surface reconstruction. The research on both topics led to important results that have been published and presented in articles and conferences of international relevance.
In questa tesi sono trattati due argomenti principali "Geometric Surface Processing" e "Virtual Modeling". L'ispirazione e la coordinazione di gran parte del lavoro di ricerca contenuto nella tesi e' dovuta al progetto New Interactive and Innovative Technologies for CAD (NIIT4CAD), finanziato dall'European Eurostars Programme. NIIT4CAD ha l'ambizioso obiettivo di superare le limitazioni degli approcci tradizionali alla modellazione di superfici dei moderni sistemi di progettazione assistita al calcolatore, introducendo nuove metodologie e tecnologie basate su superfici di suddivisione in un nuovo framework virtuale di modellazione. Tali innovazioni permetteranno progettisti ed ingegneri a trasformare velocemente ed intuitivamente l'idea di una forma in un modello geometrico ad alta qualita' adatto per scopi ingegneristici e di produzione. Uno degli obiettivi della tesi e' proprio la ricostruzione e modellazione di superfici, rappresentanti oggetti a topologia arbitraria, partendo da curve 3D irregolari acquisite tramite un dispositivo smart-pen sviluppato ad-hoc. La tesi e' organizzata in due parti: "Geometric Surface Processing" e "Virtual Modeling". Durante lo sviluppo della pipeline geometrica del nostro sistema di modellazione virtuale, abbiamo affrontato diverse problematiche che hanno attratto il nostro interesse ed aperto nuove aree di ricerca e sperimentazione. Nella prima parte, presentiamo tali teorie ed alcune applicazioni nell'ambito di Geometric Surface Processing. Questo ci permette di formalizzare meglio e dare una visione piu' ampia ad alcune delle tecniche usate nelle ultime versioni del nostro sistema ricostruzione di superfici e modellazione virtuale. Il lavoro di ricerca per entrambi gli argomenti ha portato al raggiungimento di importanti risultati che sono stati pubblicati e presentati in articoli e conferenze di rilevanza internazionale.
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BOTTI, SOFIA. "Mathematical modeling of Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes (hiPSC-CMs): from ionic currents to 3D ventricle models." Doctoral thesis, Università degli studi di Pavia, 2022. https://hdl.handle.net/11571/1467309.

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Zanello, Francesca. "Contributions to modeling of Venice coastal peatlands and wetlands." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3427411.

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The present Thesis reports an articulated research work that covers several aspects connected with the modeling of subsurface hydrology of organic soils in connection to the main hazards induced by land subsidence of peatlands and the conservation and wise use of wetlands in the Venetian area. The dynamics of peatland surface deformation both at long and short time scale is studied and a novel two-step modeling approach is proposed to separate the reversible and irreversible components of the land surface displacement. An empirical relationship is calibrated on the estimated irreversible component of the ground displacements recorded in a 4-year long experimental study in a field site located in the Zennare Basin,Italy. The expected evolution of the Venetian peatland over the present century is then investigated. The study of the hydrology of organic soils is then focused on the hysteretical behavior of the moisture retention curve measured in the peat soils of the Zennare Basin. The results of the application of a modeling approach that couples an hysteresis model with a relationship that links the soil matrix porosity dynamic to water saturation bring out the importance of including the swelling/shrinkage phenomenon in the description and prediction of water flow into organic soils. In the last part of the Thesis the focus is shifted to the hydrological dynamics of salt marshes, delicate intertidal zones characterized by a strong hydrological connection between the atmosphere and the subsurface mainly in terms of air fluxes. A two-phase flow model is developed in order to investigate the effects of air flow in the wetlands dynamics. A pressure-based formulation is chosen to allow for natural treatment of the complex and nonlinear boundary conditions to be imposed at the soil-atmosphere interface to take into account the interplay between evapo-transpiration during emersion periods and tidal fluctuations during soil submersion. The results of the application of the model to some test cases aimed at verifying the effect of the inclusion of the air dynamics in the simulation of the water flow in the vadose zone are presented.
La presente Tesi riferisce di un articolato lavoro di ricerca che ha coperto diversi aspetti connessi con la modellazione dei processi idrologici sotterranei nei suoli organici in relazione ai principali rischi indotti dalla subsidenza delle aree torbose e alla conservazione e all’uso consapevole delle aree umide nel comprensorio lagunare veneziano. Sono state analizzate le dinamiche delle deformazioni dei terreni torbosi sia su lunga che su breve scala temporale e si propone un approccio modellistico in due step finalizzato alla separazione dei contributi reversibile e irreversibile della dello spostamento della superficie. Una relazione empirica per la stima degli spostamenti indotti dalla bio-ossidazione della matrice organica è stata quindi calibrata a partire dalla stimata determinata porzione irreversibile degli spostamenti registrati nell’ambito di una campagna sperimentale di 4 anni nel Bacino Zennare, Italia, Si è infine investigato l’evoluzione attesa delle zone torbose nell’area di Venezia nel secolo in corso. Lo studio dell’idrologia dei suoli organici è proseguito con l’analisi del comportamento isteretico della curva di ritenzione capillare misurata nei suoli del Bacino Zennare. I risultati dell’applicazione di un modello che accoppia un modello di isteresi con una relazione empirica che lega la variazione di porosità della matrice solida al grado di saturazione in acqua hanno messo in luce l’importanza delle deformazioni reversibili nella definizione delle curve di risalita capillare nei suoli organici. L’ultima parte è focalizzata sulle dinamiche idrologiche delle zone barenali, delicate aree intertidali caratterizzate da un forte feedback tra l’atmosfera e il sottosuolo, principalmente in termini di flussi d’aria. Si è sviluppato un modello bifase al fine di approfondire gli effetti del flusso d’aria nelle dinamiche sotterranee. È stato adottata una formulazione alle pressioni che consente il trattamento naturale delle complesse condizioni al contorno non lineari sull’interfaccio suolo/atmosfera al fine di includere gli effetti di evapotraspirazione durante i periodi di emersione e le fluttuazioni mareali in quelle di sommersione della superficie barenale. I risultati dell’applicazione del modello ad alcuni casi test finalizzati al verificare l’importanza di considerare il flusso d’aria nella descrizione del flusso idrico nella zona insatura sono infine proposti.
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Gonzalez, Bejarano Mario Elias. "Modelagem numerica e experimental do processo de mudança de fase em placas paralelas." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263754.

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Orientador: Kamal Abdel Radi Ismail
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-08-09T04:28:28Z (GMT). No. of bitstreams: 1 GonzalezBejarano_MarioElias_M.pdf: 3100005 bytes, checksum: 12668e0ddb58dbc3a200122e0c40da4b (MD5) Previous issue date: 2006
Resumo: No presente trabalho estuda-se o fenômeno de mudança de fase de um PCM em placas paralelas que compõe um banco de gelo. Parâmetros importantes como o espaçamento entre as placas, a temperatura da placa, a temperatura do fluido de trabalho e a vazão, são considerados numa faixa variável. Desenvolveu-se um modelo numérico para simular o processo de solidificação com o objetivo de determinar a posição da frente de solidificação e a distribuição de temperaturas na fase sólida, além de avaliar a influência dos parâmetros considerados. As equações governantes, considerando transferência de calor unidimensional, foram discretizadas utilizando o método de diferenças finitas e o esquema modificado de espaço de tempo variável (MVTS) para a resolução da malha computacional. Considera-se a temperatura inicial do PCM igual à da solidificação e com propriedades constantes. A modelagem da solidificação foi feita para os casos de temperatura da superfície da placa constante e variável. Para validar o modelo numérico, foi construída uma bancada experimental onde foram feitos diversos testes com os parâmetros mencionados anteriormente. Os resultados numéricos obtidos foram analisados e comparados. Estes mostraram concordância satisfatória com os resultados experimentais para a modelagem realizada com temperatura da placa variável. Os resultados deste trabalho podem ser utilizados para o projeto de armazenadores de calor latente em geometrias planas
Abstract: In the present work, the phase change phenomenon of a PCM in parallel plates that compose an ice bank is studied. Important parameters such as the gap between the plates, the plate temperature, the temperature and flow of the secondary fluid are considered. A numerical model was developed to simulate the solidification process with the aim of determine the position of the solidification front and the temperatures distribution at the solid phase, moreover, to evaluate the influence of the considered parameters. The governing equations, considering one-dimensional heat transfer, had been discretized using the finite differences method and the modified variable time steps scheme (MVTS) to resolve the computational mesh. The PCM was considered initially at solidification temperature and with constant thermal properties. The solidification model was made for the cases of constant plate temperature and variable temperature. To validate the numerical model, an experimental device was constructed where many tests were carried through with the mentioned parameters. The numerical results were analyzed and compared. These ones show satisfactory agreement with the experimental results for the modeling carried through with variable plate temperature. The results of this work can be used for the project of latent heat storage systems with plain geometries
Mestrado
Engenharia Termica e Fluidos
Mestre em Engenharia Mecânica
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9

Manoli, Gabriele. "Contribution to modeling of soil-plant-atmosphere interactions and coupled hydro-geophysical data assimilation." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423556.

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Understanding the complex feedback mechanisms regulating the land-atmosphere system has become a scientific imperative, as human induced changes may impact the stability of the Biosphere, both locally and globally. The present thesis work aims at improving current understanding and forecasting capabilities of the Soil-Plant-Atmosphere (SPA) continuum. To this purpose a numerical model of soil moisture dynamics is coupled with plant transpiration and photosynthesis. Soil moisture dynamics is modeled by the 3-D Richards equation and plant uptake is described by an Ohm's law type model accounting for water potential gradients and root, xylem and stomatal conductances. The transpiration flux from soil to the atmosphere is driven by the leaf water potential which is controlled by both local soil moisture conditions and atmospheric forcing. The hydraulic model is linked to the atmosphere by the calculation of the stomatal conductance which is optimized for maximum carbon gain considering Fickian mass transfer of CO2 and H2O through stomata and a biochemical model of photosynthesis. The model is used to investigate competition for water among multiple tree rooting systems in a Loblolly pine (Pinus Taeda) plantation and then coupled with a crop growth module to investigate farmland productivity at the field scale. In order to provide a fully-coupled description of the SPA system, the soil-plant model is then coupled with a slab representation of the Atmospheric Boundary Layer (ABL) and used to investigate the role of water table fluctuations and free atmospheric state on convective rainfall initiation. Model results compared well with measurements of soil moisture, sap flow in the plant xylem as well as energy fluxes above the canopy and convective rainfall initiation time. In order to deal with the high degree of uncertainty related to both measurement and model errors the applicability of a data assimilation algorithm has also been explored to incorporate physical measurements into the transient hydrological model. Given the recent development of indirect geophysical surveys to monitor soil-plant interactions in the vadose zone, we tested an innovative iterative particle filter approach for coupled hydro-geophysical inversion of Electrical Resistivity Tomography (ERT) data. Model results demonstrate the ability of the method to improve model prediction and estimate multiple model parameters and this work lays the foundation for application of the methodology to soil-plant-atmosphere modeling.
La comprensione dei molteplici meccanismi che regolano l'interazione tra suolo, vegetazione e atmosfera è oggi divenuta un imperativo nel campo della ricerca scientifica, poichè numerose sono le conseguenze che la presenza antropica puo avere sulla stabilità della Biosfera, a livello sia globale che locale. Questo lavoro di tesi si propone l'obiettivo di sviluppare nuovi strumenti modellistici che consentano una più accurata comprensione e descrizione del sistema suolo-vegetazione-atmosfera. A tal fine, un modello di trapirazione e fotosintesi della vegetazione è stato introdotto in un codice numerico per la descrizione del flusso in mezzi porosi. La dinamica dell'umidita del suolo e descritta dall'equazione tridimensionale di Richards, mentre il trasporto d'acqua attraverso le radici ed all'interno della pianta e definito tramite un modello di resistenze e potenziali idrici basato sulla legge di Ohm. Il flusso traspirativo è regolato dal potenziale fogliare, a sua volta determinato da condizioni locali di umidità del suolo e dalle forzanti atmosferiche. Il modello idraulico di assorbimento radicale è collegato all'atmosfera tramite il calcolo della resistenza stomatica, determinata sulla base di un modello di ottimizzazione dell'apertura degli stomi che massimizza la fotosintesi (descritta per mezzo di un modello biochimico) e minimizza la traspirazione. Tale approccio modellistico è stato impiegato per comprendere i meccanismi di competizione tra diverse piante per l'assorbimento idrico in una piantagione di Pinus Taeda. Il modello è stato inoltre integrato con un modulo di crescita del mais (Zea mays L.) per studiare la produttività agricola alla scala di bacino. Al fine di descrivere in modo completo le interazioni fra vegetazione ed atmosfera, il modello è stato poi accoppiato con la dinamica dello strato limite planetario ed utilizzato per comprendere l'effetto della falda e delle condizioni dell'atmosfera libera sugli eventi di precipitazione dovuti alla formazione di nubi convettive. I risultati modellistici illustrati in questa tesi sono confrontati con osservazioni di contenuto d'acqua nel suolo, misure di flussi xilematici, flussi energetici al di sopra della canopy ed eventi convettivi di precipitazione, dimostrando le ottime capacità predittive del modello sviluppato. Sia le osservazioni che i risultati numerici sono tuttavia caratterizzati da un certo grado di errore. Per ovviare a tale incertezza è stato pertanto studiato un algoritmo di assimilazione dei dati che consente di incorporare le osservazioni fisiche nel modello dinamico idrologico. Dal momento che recenti studi di settore si sono focalizzati sull'utilizzo di metodi geofisici indiretti per la caratterizzazione dei processi di interazione fra suolo e vegetazione, in questo lavoro di tesi è stato sviluppato un metodo particle filter iterativo per l'inversione idro-geofisica accoppiata di dati di tomografia elettrica. I risultati presentati in questa tesi dimostrano l'abilità del metodo proposto di migliorare le previsioni e stimare i parametri del modello e pongono le basi per un nuovo approccio alla simulazione numerica del sistema suolo-vegetazione-atmosfera.
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Martalo', G. "DIFFERENT SCALE MODELING FOR CROWD DYNAMICS AND MULTI-TEMPERATURE GAS MIXTURES." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/243643.

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In the first part of this work we want to propose a model able to reproduce correctly the dynamics of a crowd in bounded domains (for example rooms and corridors) and in presence of obstacles, and also to discuss the emergence of some behaviors induced by panic. Starting from the analysis of a microscopic description for a small crowd one can deduce some mesoscopic and macroscopic models when the number of agents increases and the crowd is more comparable to gases and fluids. In the second part we want to propose some multi-temperature models for gas mixtures by means of standard tools of kinetic theory. Some descriptions are proposed also in presence of chemical reactions and of an internal structure for molecules to take non-translational degrees of freedom into account. The resulting models are tested on the classical problem of the steady shock wave and the occurence of smooth solutions and sub-shocks is discussed for varying parameters.
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Books on the topic "Numerica Modeling"

1

Hentenryck, Pascal Van. Numerica: A modeling language for global optimization. Cambridge, Mass: MIT Press, 1997.

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Riccardo, Sacco, and Saleri Fausto, eds. Matematica Numerica. 3rd ed. Milano: Springer Milan, 2008.

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Miidla, Peep. Numerical modelling. Rijeka, Croatia: InTech, 2012.

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1929-, Chung T. J., ed. Numerical modeling in combustion. Washington, DC: Taylor & Francis, 1993.

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A, Beckmann, ed. Numerical ocean circulation modeling. London: Imperial College Press, 1999.

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S, Oran Elaine, and Boris Jay P, eds. Numerical approaches to combustion modeling. Washington, DC: American Institute of Aeronautics and Astronautics, 1991.

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Hofstetter, Günter, and Günther Meschke, eds. Numerical Modeling of Concrete Cracking. Vienna: Springer Vienna, 2011. http://dx.doi.org/10.1007/978-3-7091-0897-0.

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Chalikov, Dmitry V. Numerical Modeling of Sea Waves. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-32916-1.

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Lin, Pengzhi. Numerical modeling of water waves. London: Taylor & Francis, 2008.

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1938-, Murty T. S., ed. Numerical modeling of ocean dynamics. Singapore: World Scientific, 1993.

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Book chapters on the topic "Numerica Modeling"

1

Greenspan, Donald. "Numerical Methodology." In Particle Modeling, 7–21. Boston, MA: Birkhäuser Boston, 1997. http://dx.doi.org/10.1007/978-1-4612-1992-7_2.

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Helmig, Rainer. "Numerical modeling." In Multiphase Flow and Transport Processes in the Subsurface, 141–227. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60763-9_4.

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Modaressi-Farahmand-Razavi, Arezou. "Numerical Modeling." In Multiscale Geomechanics, 243–332. Hoboken, NJ USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118601433.ch9.

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Gornitz, Vivian, Nicholas C. Kraus, Nicholas C. Kraus, Ping Wang, Ping Wang, Gregory W. Stone, Richard Seymour, et al. "Numerical Modeling." In Encyclopedia of Coastal Science, 730–33. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3880-1_232.

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Lee, Kun Sang, and Tae Hong Kim. "Numerical Modeling." In Integrative Understanding of Shale Gas Reservoirs, 43–55. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29296-0_3.

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Johansson, Robert. "Statistical Modeling." In Numerical Python, 333–62. Berkeley, CA: Apress, 2015. http://dx.doi.org/10.1007/978-1-4842-0553-2_14.

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Johansson, Robert. "Statistical Modeling." In Numerical Python, 471–511. Berkeley, CA: Apress, 2018. http://dx.doi.org/10.1007/978-1-4842-4246-9_14.

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Giovangigli, Vincent. "Numerical Simulations." In Multicomponent Flow Modeling, 301–15. Boston, MA: Birkhäuser Boston, 1999. http://dx.doi.org/10.1007/978-1-4612-1580-6_12.

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Haefner, James W. "Numerical Techniques." In Modeling Biological Systems, 118–32. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-4119-6_6.

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Ueberhuber, Christoph W. "Scientific Modeling." In Numerical Computation 1, 1–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-59118-1_1.

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Conference papers on the topic "Numerica Modeling"

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Blacquière, Gerrit, and Edith van Veldhuizen. "Physical modeling versus numerical modeling." In SEG Technical Program Expanded Abstracts 2003. Society of Exploration Geophysicists, 2003. http://dx.doi.org/10.1190/1.1817878.

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Tomiya, Mitsuyoshi. "Numerical approach to spectral properties of coupled quartic oscillators." In Modeling complex systems. AIP, 2001. http://dx.doi.org/10.1063/1.1386841.

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Sytova, S. "X-ray time-dependent diffraction: Theory and numerical experiments." In Modeling complex systems. AIP, 2001. http://dx.doi.org/10.1063/1.1386883.

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Malta, Edgard Borges, Marcos Cueva, Kazuo Nishimoto, Rodolfo Golc¸alves, and Isai´as Masetti. "Numerical Moonpool Modeling." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92456.

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The use of moonpools in offshore technology are normally related to the hull opening in drilling units with the objective to protect drilling equipment from environmental forces, and its design aims the minimum motion of the water inside the moonpool, avoiding water impacts when lowering an equipment. Several studies have been carried out to predict the water dynamics inside the moonpool. At most, analytical tools have been used with experimental results, to obtain a good evaluation of viscous effects. Another line of development uses the moonpools as a device to reduce motions of ships or oil platforms. In his context, the use of moonpools in monocolumn type platforms was studied during the development of the concept, through the partnership between PETROBRAS and University of Sa˜o Paulo–USP. An alternative that became viable in the last years is the use of numerical methods to evaluate potencial parameters, being only necessary simple experiments to obtains viscous data to complete the model. This work, that is a continuation of articles about the issue written before, intends to consolidate the calculation method of moonpool to monocolumn units.
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Szyszka, Barbara, Theodore E. Simos, George Psihoyios, and Ch Tsitouras. "Mathematical Modeling of Secondary Timber Processing." In Numerical Analysis and Applied Mathematics. AIP, 2007. http://dx.doi.org/10.1063/1.2790201.

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Kozák, Vladislav. "Cohesive Zone Modelling." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2008. American Institute of Physics, 2008. http://dx.doi.org/10.1063/1.2990924.

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Szyszka, Barbara, and Klaudyna Rozmiarek. "Mathematical Modeling of Primary Wood Processing." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2008. American Institute of Physics, 2008. http://dx.doi.org/10.1063/1.2990980.

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Gale, J. D. "Modelling the thermal expansion of zeolites." In Neutrons and numerical methods. AIP, 1999. http://dx.doi.org/10.1063/1.59485.

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French, S. A., and C. R. A. Catlow. "Molecular modelling of organic superconducting salts." In Neutrons and numerical methods. AIP, 1999. http://dx.doi.org/10.1063/1.59479.

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Frunzulică, F., H. Dumitrescu, and V. Cardos. "Modeling stall-delay using corrected BEM." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2012: International Conference of Numerical Analysis and Applied Mathematics. AIP, 2012. http://dx.doi.org/10.1063/1.4756479.

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Reports on the topic "Numerica Modeling"

1

McAlpin, Jennifer, and Jason Lavecchia. Brunswick Harbor numerical model. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40599.

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The Brunswick area consists of many acres of estuarine and marsh environments. The US Army Corps of Engineers District, Savannah, requested that the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, develop a validated Adaptive Hydraulics model and assist in using it to perform hydrodynamic modeling of proposed navigation channel modifications. The modeling results are necessary to provide data for ship simulation. The model setup and validation are presented here.
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Delk, Tracey. Numerical Modeling of Slopewater Circulation. Fort Belvoir, VA: Defense Technical Information Center, January 1996. http://dx.doi.org/10.21236/ada375720.

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Torres, Marissa, Michael-Angelo Lam, and Matt Malej. Practical guidance for numerical modeling in FUNWAVE-TVD. Engineer Research and Development Center (U.S.), October 2022. http://dx.doi.org/10.21079/11681/45641.

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This technical note describes the physical and numerical considerations for developing an idealized numerical wave-structure interaction modeling study using the fully nonlinear, phase-resolving Boussinesq-type wave model, FUNWAVE-TVD (Shi et al. 2012). The focus of the study is on the range of validity of input wave characteristics and the appropriate numerical domain properties when inserting partially submerged, impermeable (i.e., fully reflective) coastal structures in the domain. These structures include typical designs for breakwaters, groins, jetties, dikes, and levees. In addition to presenting general numerical modeling best practices for FUNWAVE-TVD, the influence of nonlinear wave-wave interactions on regular wave propagation in the numerical domain is discussed. The scope of coastal structures considered in this document is restricted to a single partially submerged, impermeable breakwater, but the setup and the results can be extended to other similar structures without a loss of generality. The intended audience for these materials is novice to intermediate users of the FUNWAVE-TVD wave model, specifically those seeking to implement coastal structures in a numerical domain or to investigate basic wave-structure interaction responses in a surrogate model prior to considering a full-fledged 3-D Navier-Stokes Computational Fluid Dynamics (CFD) model. From this document, users will gain a fundamental understanding of practical modeling guidelines that will flatten the learning curve of the model and enhance the final product of a wave modeling study. Providing coastal planners and engineers with ease of model access and usability guidance will facilitate rapid screening of design alternatives for efficient and effective decision-making under environmental uncertainty.
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Puleo, Jack, K. T. Holland, and D. Slinn. Numerical Modeling of Swash Zone Hydrodynamics. Fort Belvoir, VA: Defense Technical Information Center, June 2002. http://dx.doi.org/10.21236/ada403978.

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Leighton, Richard. Enhanced Numerical Modeling of Breaking Waves. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada455681.

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O'Brien, James J. Ocean Science Educator in Numerical Modeling. Fort Belvoir, VA: Defense Technical Information Center, June 1994. http://dx.doi.org/10.21236/ada281455.

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Kerley, Gerald I. Numerical Modeling of Buried Mine Explosions. Fort Belvoir, VA: Defense Technical Information Center, March 2001. http://dx.doi.org/10.21236/ada392569.

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Singh, Surendra, and William P. Roach. Numerical Modeling of Antenna Near Field. Fort Belvoir, VA: Defense Technical Information Center, August 2007. http://dx.doi.org/10.21236/ada473446.

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Krzanowsky, R. M., R. K. Singhal, and N. H. Wade. Numerical modelling of material diggability. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/304973.

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Strain, John. Numerical Modelling of Crystal Growth. Fort Belvoir, VA: Defense Technical Information Center, September 1992. http://dx.doi.org/10.21236/ada271206.

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