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Mathematical analysis --- Reaction-diffusion equations. --- Approximation theory. --- Burgers equation. --- Equations de réaction-diffusion --- Théorie de l'approximation --- Burgers, Equation de --- 51 <082.1> --- Mathematics--Series --- Équations de réaction-diffusion. --- Approximation, Théorie de l'. --- Equations de réaction-diffusion --- Théorie de l'approximation --- Approximation theory --- Burgers equation --- Reaction-diffusion equations --- Diffusion-reaction equations --- Equations, Reaction-diffusion --- Differential equations, Parabolic --- Diffusion equation, Nonlinear --- Heat flow equation, Nonlinear --- Nonlinear diffusion equation --- Nonlinear heat flow equation --- Heat equation --- Navier-Stokes equations --- Turbulence --- Theory of approximation --- Functional analysis --- Functions --- Polynomials --- Chebyshev systems
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These lecture notes are woven around the subject of Burgers' turbulence/KPZ model of interface growth, a study of the nonlinear parabolic equation with random initial data. The analysis is conducted mostly in the space-time domain, with less attention paid to the frequency-domain picture. However, the bibliography contains a more complete information about other directions in the field which over the last decade enjoyed a vigorous expansion. The notes are addressed to a diverse audience, including mathematicians, statisticians, physicists, fluid dynamicists and engineers, and contain both rigorous and heuristic arguments. Because of the multidisciplinary audience, the notes also include a concise exposition of some classical topics in probability theory, such as Brownian motion, Wiener polynomial chaos, etc.
Partial differential equations --- Interfaces (Physical sciences) --- Turbulence --- Burgers equation --- Differential equations, Parabolic --- Mathematical models --- Mathematical Theory --- Atomic Physics --- Physics --- Mathematics --- Physical Sciences & Mathematics --- Differentiaalvergelijkingen [Parabolische ] --- Differential equations [Parabolic] --- Diffusion equation [Nonlinear ] --- Equations differentielles paraboliques --- Heat flow equation [Nonlinear ] --- Interface (Physical sciences) --- Partial differential equations. --- Probabilities. --- Partial Differential Equations. --- Probability Theory and Stochastic Processes. --- Probability --- Statistical inference --- Combinations --- Chance --- Least squares --- Mathematical statistics --- Risk --- Burgers equation. --- Mathematical models. --- Diffusion equation, Nonlinear --- Heat flow equation, Nonlinear --- Nonlinear diffusion equation --- Nonlinear heat flow equation --- Heat equation --- Navier-Stokes equations --- Interfaces (Physical sciences) - Mathematical models --- Turbulence - Mathematical models
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The aim of these notes is to include in a uniform presentation style several topics related to the theory of degenerate nonlinear diffusion equations, treated in the mathematical framework of evolution equations with multivalued m-accretive operators in Hilbert spaces. The problems concern nonlinear parabolic equations involving two cases of degeneracy. More precisely, one case is due to the vanishing of the time derivative coefficient and the other is provided by the vanishing of the diffusion coefficient on subsets of positive measure of the domain. From the mathematical point of view the results presented in these notes can be considered as general results in the theory of degenerate nonlinear diffusion equations. However, this work does not seek to present an exhaustive study of degenerate diffusion equations, but rather to emphasize some rigorous and efficient techniques for approaching various problems involving degenerate nonlinear diffusion equations, such as well-posedness, periodic solutions, asymptotic behaviour, discretization schemes, coefficient identification, and to introduce relevant solving methods for each of them.
Burgers equation --- Degenerate differential equations --- Mathematics --- Physical Sciences & Mathematics --- Calculus --- Burgers equation. --- Degenerate differential equations. --- Equations of degenerate type --- Diffusion equation, Nonlinear --- Heat flow equation, Nonlinear --- Nonlinear diffusion equation --- Nonlinear heat flow equation --- Mathematics. --- Partial differential equations. --- Applied mathematics. --- Engineering mathematics. --- Calculus of variations. --- Partial Differential Equations. --- Calculus of Variations and Optimal Control; Optimization. --- Applications of Mathematics. --- Isoperimetrical problems --- Variations, Calculus of --- Maxima and minima --- Engineering --- Engineering analysis --- Mathematical analysis --- Partial differential equations --- Math --- Science --- Differential equations, Partial --- Heat equation --- Navier-Stokes equations --- Turbulence --- Differential equations, partial. --- Mathematical optimization. --- Optimization (Mathematics) --- Optimization techniques --- Optimization theory --- Systems optimization --- Operations research --- Simulation methods --- System analysis
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Asymptotic expansions. --- Burgers equation. --- Turbulence --- Mathematical models. --- Burgers equation --- Asymptotic expansions --- Burgers, Equation de --- Développements asymptotiques --- 532.517 --- -Flow, Turbulent --- Turbulent flow --- Diffusion equation, Nonlinear --- Heat flow equation, Nonlinear --- Nonlinear diffusion equation --- Nonlinear heat flow equation --- Heat equation --- Asymptotes --- Convergence --- Divergent series --- Liquid motion according to type of flow --- -Liquid motion according to type of flow --- 532.517 Liquid motion according to type of flow --- -Diffusion equation, Nonlinear --- Flow, Turbulent --- Développements asymptotiques --- Navier-Stokes equations --- Asymptotic developments --- Difference equations --- Functions --- Numerical analysis --- Mathematical models --- Mathematical physics --- Fluid mechanics --- Modèles mathématiques --- Turbulence - Mathematical models
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This monograph explores a dual variational formulation of solutions to nonlinear diffusion equations with general nonlinearities as null minimizers of appropriate energy functionals. The author demonstrates how this method can be utilized as a convenient tool for proving the existence of these solutions when others may fail, such as in cases of evolution equations with nonautonomous operators, with low regular data, or with singular diffusion coefficients. By reducing it to a minimization problem, the original problem is transformed into an optimal control problem with a linear state equation. This procedure simplifies the proof of the existence of minimizers and, in particular, the determination of the first-order conditions of optimality. The dual variational formulation is illustrated in the text with specific diffusion equations that have general nonlinearities provided by potentials having various stronger or weaker properties. These equations can represent mathematical models to various real-world physical processes. Inverse problems and optimal control problems are also considered, as this technique is useful in their treatment as well.
Differential equations. --- System theory. --- Control theory. --- Operator theory. --- Mathematical optimization. --- Calculus of variations. --- Differential Equations. --- Systems Theory, Control . --- Operator Theory. --- Calculus of Variations and Optimization. --- Isoperimetrical problems --- Variations, Calculus of --- Maxima and minima --- Optimization (Mathematics) --- Optimization techniques --- Optimization theory --- Systems optimization --- Mathematical analysis --- Operations research --- Simulation methods --- System analysis --- Functional analysis --- Dynamics --- Machine theory --- Systems, Theory of --- Systems science --- Science --- 517.91 Differential equations --- Differential equations --- Philosophy --- Burgers equation. --- Differential equations, Nonlinear. --- Nonlinear differential equations --- Nonlinear theories --- Diffusion equation, Nonlinear --- Heat flow equation, Nonlinear --- Nonlinear diffusion equation --- Nonlinear heat flow equation --- Heat equation --- Navier-Stokes equations --- Turbulence --- Equacions diferencials no lineals
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Rheology, defined as the science of deformation and flow of matter, is a multidisciplinary scientific field, covering both fundamental and applied approaches. The study of rheology includes both experimental and computational methods, which are not mutually exclusive. Its practical importance embraces many processes, from daily life, like preparing mayonnaise or spread an ointment or shampooing, to industrial processes like polymer processing and oil extraction, among several others. Practical applications include also formulations and product development. This Special Issue aims to present the latest advances in the fields of experimental and computational rheology applied to the most diverse classes of materials (foods, cosmetics, pharmaceuticals, polymers and biopolymers, multiphasic systems and composites) and processes. This Special Issue will comprise, not only original research papers, but also review articles.
n/a --- microstructure --- microfluidization --- yield stress --- nonlinear diffusion equation --- particle suspensions --- colloids --- viscous gravity spreading --- nanocomposites --- BMP model --- LCB polypropylene --- diutan gum --- thixotropy --- complex fluids --- traction test --- viscoelasticity --- biopolymer --- normal stresses --- start-up shear --- OpenFOAM --- flow properties --- rheometry --- oscillatory flows --- linear viscoelasticity --- continuum model --- steady-state and transient flow --- interfacial shear rheology --- shear-banding flow --- pressure transducers --- jetting --- natural hydraulic lime --- generalized Boussinesq equation --- prototyping --- piezoelectric --- masonry --- polymer processing --- eco-friendly surfactant --- emulsion stability --- rhamsan gum --- lubricating grease --- computational rheology --- Saffman–Taylor instability --- extrusion --- volume of fluid method --- polymers --- weak gel --- cement pastes --- Carbopol --- thyme oil --- elongational flow --- rheology --- grout --- epoxy --- polystyrene --- shear thickening --- bulk rheology --- porous medium equation --- consolidation --- Dupuit-Forchheimer assumption --- yield stress fluid --- drop formation --- dilatational rheology --- droplet size distribution (DSD) --- Navier-Stokes equations --- Saffman-Taylor instability
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