Adjoint Method
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Optimization of Airfoils for Minimum Pitching Moment and Compressibility Drag Coefficients
ABSTRACT: This paper concerns a numerical optimization method for designing airfoils based on adjoint method. The goal of present work is to reduce the compressibility drag or pitching moment of transonic airfoils without compromising on the lift coefficient. A new cost function based on this requirement is defined and the corresponding adjoint equations are
J. Aerosp. Technol. Manag.. Publicado em: 2014-12
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2. Desenvolvimento de um método espectronodal livre de erros de truncamento espacial para problemas adjuntos de transporte de partículas neutras monoenergéticas na formulação de ordenadas discretas em geometria unidimensional / Development of a spectral nodal method free from spatial truncation error for one-speed neutral particle adjoint transport problems in the discrete ordinater formulations in slab geometry
Um método numérico nodal livre de erros de truncamento espacial é desenvolvido para problemas adjuntos de transporte de partículas neutras monoenergéticas em geometria unidimensional com fonte fixa na formulação de ordenadas discretas (SN). As incógnitas no método são os fluxos angulares adjuntos médios nos nodos e os fluxos angulares adjuntos nas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/09/2011
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3. Relaxation approaches to the optimal control of the Euler equations
The treatment of control problems governed by systems of conservation laws poses serious challenges for analysis and numerical simulations. This is due mainly to shock waves that occur in the solution of nonlinear systems of conservation laws. In this article, the problem of the control of Euler flows in gas dynamics is considered. Numerically, two semi-line
Computational & Applied Mathematics. Publicado em: 2011
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4. Investigation of the adjoint method in aerodynamic optimization using various shape parameterization techniques
This paper studies the effect of design variables vector on automatic aerodynamic shape optimization in the adjoint method. Three shape techniques are studied: surface points, relations of the NACA 4-digit airfoil series and Hicks-Henne "Bump" Functions. First, this paper presents the complete formulation of the optimal design problem for the Euler equations
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-06
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5. AJUSTE AUTOMÁTICO DE HISTÓRICO EM RESERVATÓRIOS DE PETRÓLEO UTILIZANDO O MÉTODO TSVD / AJUSTE AUTOMÁTICO DE HISTÓRICO EM RESERVATÓRIOS DE PETRÓLEO UTILIZANDO O MÉTODO TSVD
Reservoir simulation is an essential tool extensively used by reservoir engineers. It is mostly employed to predict reservoir behavior under dfferent circumstances, thus supporting decisions that frequently involve large nancial costs. In order to use this tool properly different petro-physical properties of the reservoir must be well known, such as permeabi
Publicado em: 2009
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6. Inverse aerodynamic design using the adjoint method applied to the Euler equations. / Projeto inverso aerodinâmico utilizando o método adjunto aplicado às equações de Euler.
Um desafio constante no projeto aerodinâmico de uma superfície é obter a forma geométrica que permite, baseado em uma determinada medida de mérito, o melhor desempenho possível. No contexto de projeto de aeronaves de transporte, o desempenho ótimo em cruzeiro é a principal meta do projetista. Nesse cenário, o uso da Dinâmica do Fluidos Computaciona
Publicado em: 2008
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7. AnÃlise de sensibilidade do modelo fluidodinÃmico de um Riser atravÃs do formalismo diferencial perturbativo / Sensitivity analysis for a fluid-dynamic model of a riser via the differential pertubation method
In an oil refinery, the crude oil is pre-heated in order to promote the cracking of the large hydrocarbon chains, transforming the heavy oil into lighter components. These lighter and vaporized oil (gas oil) is now submitted to a fluid catalyst cracking inside a long column denominated riser, where an ascending mixture of gas oil and solid catalyst are simul
Publicado em: 2007
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8. Sensitivity analysis of shallow water problems via perturbative methods
We applied the perturbative theory to perform sensitivity analysis of the shallow water equations. The numerical solution of these equations was found via the mass lumping finite element technique. Then, the adjoint system of the shallow water equations was derived for the one-dimensional case and the expression of the sensitivity coefficient of a generic fu
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09
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9. Sensitivity computations using first and second orders perturbative methods for the advection-diffusion-reaction model of pollutant transport
This work aims to apply the disturbance theory to accomplish sensitivity computations in problems of pollutant transported in liquid media modeled through the advection-diffusion-reaction equation. The numerical solution of the differential equation that describes the behavior of the system was found via the SUPG ("Streamline Unwinding Petrov Galerkin") fini
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-03
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10. Um mÃtodo numÃrico para anÃlise de adensamento e transporte de contaminantes no solo.
Este trabalho apresenta o desenvolvimento de um mÃtodo numÃrico para anÃlise de problemas parabÃlicos, como o transporte advectivo-dispersivo de contaminantes no solo e como o adensamento. O mÃtodo à baseado no conceito das equaÃÃes adjuntas, sendo uma das possÃveis extensÃes do ELLAM, um dos mÃtodos mais promissores na garantia de convergÃncia e
Publicado em: 2002
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11. Heat Source Estimation with the Conjugate Gradient Method in Inverse Linear Diffusive Problems
In this work, we present the solution of a class of linear inverse heat conduction problems for the estimation of unknown heat source terms, with no prior information of the functional forms of timewise and spatial dependence of the source strength, using the conjugate gradient method with an adjoint problem. After describing the mathematical formulation of
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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12. OTIMIZAÇÃO DO DISPATCH DE ENERGIA EM SISTEMAS HIDRO-TERMO-ELÉTRICOS PELO PRINCÍPIO DO MÁXIMO DISCRETO: ASCPECTOS TEÓRICOS E COMPUTACIONAIS / ON THE OPTIMAL DISPATCH OF ELECTRICAL ENERGY IN HYDRO- THERMAL- SYSTEMS OF GENERATION USING THE DISCRETE MAXIMUM PRINCIPLE: THEORETICAL AND COMPUTATIONAL ASPECTS
This work consists essentially of two parts: a theoretical and a computational one. In the first part general formulas are developed using the discrete maximum principle for the optimel dispatch of hydro-steam-electrical systems. The restrictions on the state vector (the volumes of the reservoirs) are rigorously taken into accout. The necessity and sufficien
Publicado em: 1970