A Characteristics-Mixed Finite Element Method for Advection Dominated Transport Problems

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dc.contributor.authorArbogast, Todden_US
dc.contributor.authorWheeler, Mary F.en_US
dc.date.accessioned2018-06-18T17:39:42Zen_US
dc.date.available2018-06-18T17:39:42Zen_US
dc.date.issued1992-11en_US
dc.date.noteNovember 1992en_US
dc.description.abstractWe define a new finite element method, called the characteristics-mixed method, for approximating the solution to an advection dominated transport problem. The method is based on a space-time variational form of the advection-diffusion equation. Our test functions are piecewise constant in space, and in time they approximately follow the characteristics of the advective (i.e., hyperbolic) part of the equation. Thus the scheme uses a characteristic approximation to handle advection in time. This is combined with a low order mixed finite element spatial approximation of the equation. Boundary conditions are incorporated in a natural and mass conservative fashion. The scheme is completely locally conservative; in fact, on the discrete level, fluid is transported along the approximate characteristics. A post-processing step is included in the scheme in which the approximation to the scaler unknown is improved by utilizing the approximate vector flux. This has the effect of improving the rate of convergence of the method. We show that it is optimally convergent to order one in time and at least suboptimally convergent to order 3/2 in space.en_US
dc.format.extent26 ppen_US
dc.identifier.citationArbogast, Todd and Wheeler, Mary F.. "A Characteristics-Mixed Finite Element Method for Advection Dominated Transport Problems." (1992) <a href="https://hdl.handle.net/1911/101777">https://hdl.handle.net/1911/101777</a>.en_US
dc.identifier.digitalTR92-37en_US
dc.identifier.urihttps://hdl.handle.net/1911/101777en_US
dc.language.isoengen_US
dc.titleA Characteristics-Mixed Finite Element Method for Advection Dominated Transport Problemsen_US
dc.typeTechnical reporten_US
dc.type.dcmiTexten_US
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