This paper concerns the construction and analysis of a numerical scheme for a mixed discrete-continuous fragmentation equation. A finite volume scheme is developed, based on a conservative formulation of a truncated version of the equations. The approximate solutions provided by this scheme are first shown to display conservation of mass and preservation of nonnegativity. Then, by utilising a Dunford–Pettis style argument, the sequence of approximate solutions generated is shown, under given restrictions on the model and the mesh, to converge (weakly) in an appropriate L1 space to a weak solution to the problem. By applying the methods and theory of operator semigroups, we are able to show that these weak solutions are unique and necessarily classical (differentiable) solutions, a degree of regularity not generally established when finite volume schemes are applied to such problems. Furthermore, this approach enabled us to derive a bound for the error induced by the truncation of the mass domain, and also establish the convergence of the truncated solutions as the truncation point is increased without bound. Finally, numerical simulations are performed to investigate the performance of the scheme and assess its rate of convergence as the mesh is refined, whilst also verifying the bound on the truncation error.
Keywords: Fragmentation equations, finite volume scheme, mixed discrete-continuous fragmentation model
@article{M2AN_2021__55_3_1067_0,
author = {Baird, Graham and S\"uli, Endre},
title = {A finite volume scheme for the solution of a mixed discrete-continuous fragmentation model},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
pages = {1067--1101},
year = {2021},
publisher = {EDP-Sciences},
volume = {55},
number = {3},
doi = {10.1051/m2an/2020088},
mrnumber = {4269462},
language = {en},
url = {https://www.numdam.org/articles/10.1051/m2an/2020088/}
}
TY - JOUR AU - Baird, Graham AU - Süli, Endre TI - A finite volume scheme for the solution of a mixed discrete-continuous fragmentation model JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 2021 SP - 1067 EP - 1101 VL - 55 IS - 3 PB - EDP-Sciences UR - https://www.numdam.org/articles/10.1051/m2an/2020088/ DO - 10.1051/m2an/2020088 LA - en ID - M2AN_2021__55_3_1067_0 ER -
%0 Journal Article %A Baird, Graham %A Süli, Endre %T A finite volume scheme for the solution of a mixed discrete-continuous fragmentation model %J ESAIM: Mathematical Modelling and Numerical Analysis %D 2021 %P 1067-1101 %V 55 %N 3 %I EDP-Sciences %U https://www.numdam.org/articles/10.1051/m2an/2020088/ %R 10.1051/m2an/2020088 %G en %F M2AN_2021__55_3_1067_0
Baird, Graham; Süli, Endre. A finite volume scheme for the solution of a mixed discrete-continuous fragmentation model. ESAIM: Mathematical Modelling and Numerical Analysis , Tome 55 (2021) no. 3, pp. 1067-1101. doi: 10.1051/m2an/2020088
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