Search results for "numerical analysis"

showing 10 items of 883 documents

On a new centered strategy to control the accuracy of weighted essentially non oscillatory algorithm for conservation laws close to discontinuities

2020

Computational MathematicsNumerical AnalysisConservation lawApplied MathematicsApplied mathematicsClassification of discontinuitiesControl (linguistics)AnalysisMathematicsNumerical Methods for Partial Differential Equations
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Some techniques for improving the resolution of finite difference component-wise WENO schemes for polydisperse sedimentation models

2014

Polydisperse sedimentation models can be described by a system of conservation laws for the concentration of each species of solids. Some of these models, as the Masliyah-Locket-Bassoon model, can be proven to be hyperbolic, but its full characteristic structure cannot be computed in closed form. Component-wise finite difference WENO schemes may be used in these cases, but these schemes suffer from an excessive diffusion and may present spurious oscillations near shocks. In this work we propose to use a flux-splitting that prescribes less numerical viscosity for component-wise finite difference WENO schemes. We compare this technique with others to alleviate the diffusion and oscillatory be…

Computational MathematicsNumerical AnalysisConservation lawWork (thermodynamics)ViscositySedimentation (water treatment)Component (thermodynamics)Applied MathematicsMathematical analysisFinite differenceDiffusion (business)Resolution (algebra)MathematicsApplied Numerical Mathematics
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Parallel finite element splitting-up method for parabolic problems

1991

An efficient method for solving parabolic systems is presented. The proposed method is based on the splitting-up principle in which the problem is reduced to a series of independent 1D problems. This enables it to be used with parallel processors. We can solve multidimensional problems by applying only the 1D method and consequently avoid the difficulties in constructing a finite element space for multidimensional problems. The method is suitable for general domains as well as rectangular domains. Every 1D subproblem is solved by applying cubic B-splines. Several numerical examples are presented.

Computational MathematicsNumerical AnalysisFinite element spaceSeries (mathematics)Discontinuous Galerkin methodApplied MathematicsMathematical analysisMixed finite element methodAnalysisFinite element methodExtended finite element methodMathematicsNumerical Methods for Partial Differential Equations
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A Posteriori Error Bounds for Approximations of the Oseen Problem and Applications to the Uzawa Iteration Algorithm

2014

Abstract. We derive computable bounds of deviations from the exact solution of the stationary Oseen problem. They are applied to approximations generated by the Uzawa iteration method. Also, we derive an advanced form of the estimate, which takes into account approximation errors arising due to discretization of the boundary value problem, generated by the main step of the Uzawa method. Numerical tests confirm our theoretical results and show practical applicability of the estimates.

Computational MathematicsNumerical AnalysisMathematical optimizationuzawa iteration methodApproximations of πApplied MathematicsUzawa iterationA priori and a posteriorioseen problemestimates of deviations from exact solutionsMathematicsComputational Methods in Applied Mathematics
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A method for detecting vacancy diffusion in molecular dynamics

1992

Computational MathematicsNumerical AnalysisMolecular dynamicsMaterials sciencePhysics and Astronomy (miscellaneous)Chemical physicsApplied MathematicsModeling and SimulationVacancy defectStatistical physicsDiffusion (business)Computer Science ApplicationsJournal of Computational Physics
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On regularity up to the boundary of solutions to a system of degenerate nonlinear elliptic fourth-order equations

2008

Under some hypotheses on weighted functions, using the interior regularity results established in (Kovalevsky, A. and Nicolosi, F., 2005, Existence and regularity of solutions to a system of degenerate nonlinear fourth-order equations. Nonlinear Analysis, 61, 281–307) and estimating the oscillation of solutions near the boundary of Ω, we establish results on regularity up to the boundary of a solutions of the system (1.1).

Computational MathematicsNumerical AnalysisNonlinear systemFourth orderOscillationApplied MathematicsMathematical analysisDegenerate energy levelsBoundary (topology)AnalysisMathematicsComplex Variables and Elliptic Equations
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Implicit–explicit schemes for nonlinear nonlocal equations with a gradient flow structure in one space dimension

2019

Computational MathematicsNumerical AnalysisNonlinear systemImplicit explicitApplied MathematicsMathematical analysisSpace dimensionStructure (category theory)Balanced flowAnalysisMathematicsNumerical Methods for Partial Differential Equations
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On the systolic calculation of all-pairs interactions using transputer arrays

1991

Computational MathematicsNumerical AnalysisParallelism (rhetoric)Physics and Astronomy (miscellaneous)Computer scienceApplied MathematicsModeling and SimulationTransputerNumerical analysisParticle interactionMultiprocessingParallel computingComputer Science ApplicationsJournal of Computational Physics
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A Spline Collocation Scheme for the Spherical Shallow Water Equations

1999

Computational MathematicsNumerical AnalysisPhysics and Astronomy (miscellaneous)Spline collocationApplied MathematicsModeling and SimulationScheme (mathematics)Method of linesMathematical analysisNumerical weather predictionShallow water equationsComputer Science ApplicationsMathematicsJournal of Computational Physics
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Nonexistence of solutions to higher order evolution inequalities with nonlocal source term on Riemannian manifolds

2022

We establish sufficient conditions for the nonexistence of nontrivial solutions to higher order evolution inequalities, with respect to the time variable. We consider a nonlocal source term, and work on complete noncompact Riemannian manifolds. The obtained conditions depend on the parameters of the problem and the geometry of the manifold. Our main result recovers some nonexistence theorems from the literature, established in the whole Euclidean space.

Computational MathematicsNumerical AnalysisRiemannian manifoldsnontrivial global weak solutionsSettore MAT/05 - Analisi MatematicaApplied Mathematicshigher order evolution inequalitiesNonexistenceAnalysis
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