Modelling with measures : approximation of a mass-emitting object by a point source

J.H.M. Evers, S.C. Hille, A. Muntean

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We consider a linear diffusion equation on O := R^2 \ O_O, where O_O is a bounded domain. The (time-dependent) flux on the boundary G := dO_O is prescribed. The aim of the paper is to approximate the dynamics by the solution of the diffusion equation on the whole of R^2 with a measure-valued point source in the origin and provide estimates for the quality of approximation. For all time t, we derive an L^2(0,t; L^2(G))-bound on the difference in flux on the boundary. Moreover, we derive for all t an L^2(O)-bound and an L^2(0,t; H^1(O))-bound for the difference of the solutions to the two models. Keywords : Point source, model reduction, boundary exchange, diffusion, quantitative flux estimates, modelling with measures.
Original languageEnglish
Pages (from-to)357-373
Number of pages17
JournalMathematical Biosciences and Engineering
Issue number2
Publication statusPublished - 2015


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