The patch test in the finite element method is a simple indicator of the quality of a finite element, developed by Bruce Irons.The patch test uses a partial differential equation on a domain consisting from several elements set up so that the exact solution is known and can be reproduced, in principle, with zero error. Typically, in mechanics, the prescribed exact solution consists of displacements that vary as piecewise linear functions in space (called a constant strain solution). The elements pass the patch test if the finite element solution is the same as the exact solution. It was long conjectured by engineers that passing the patch test is sufficient for the convergence of the finite element, that is, to ensure that the solutions from the finite element method converge to the exact solution of the partial differential equation as the finite element mesh is refined. However, this is not the case, and the patch test is neither sufficient nor necessary for convergence. A broader definition of patch test (applicable to any numerical method, including and beyond finite elements) is any test problem having an exact solution that can, in principle, be exactly reproduced by the numerical approximation. Therefore, a finite-element simulation that uses linear shape functions has patch tests for which the exact solution must be piecewise linear, while higher-order finite elements have correspondingly higher-order patch tests. (Wikipedia).
Calculus, Comparison Test (LCT), 11 4 #7
Calculus, Algebra and more at www.blackpenredpen.com Differential equation, factoring, linear equation, quadratic equation, derivatives, integrals, stewart calculus 7th edition, algebra.
From playlist Calculus, Sect 11.4, Direct & Limit Comparison Test
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From playlist Advanced Calculus / Multivariable Calculus
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From playlist Course 8: Fourier Analysis
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From playlist Partial Derivatives
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From playlist Linear Algebra
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From playlist MIT Nonlinear Finite Element Analysis
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From playlist Numerical Analysis and Scientific Computing
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From playlist HIM Lectures: Trimester Program "Multiscale Problems"
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From playlist HIM Lectures: Trimester Program "Multiscale Problems"
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From playlist HIM Lectures: Trimester Program "Multiscale Problems"
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From playlist Advanced Calculus / Multivariable Calculus
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DISCUSSION MEETING Multi-Scale Analysis: Thematic Lectures and Meeting (MATHLEC-2021, ONLINE) ORGANIZERS: Patrizia Donato (University of Rouen Normandie, France), Antonio Gaudiello (Università degli Studi di Napoli Federico II, Italy), Editha Jose (University of the Philippines Los Baño
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Tired with Phase Transitions - Alessandro Treves
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