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JOURNALS // Zhurnal Vychislitel'noi Matematiki i Matematicheskoi Fiziki // Archive

Zh. Vychisl. Mat. Mat. Fiz., 2025 Volume 65, Number 7, Pages 1091–1109 (Mi zvmmf12006)

General numerical methods

A fast numerical method for the source reconstruction in the coagulation-fragmentation equation

R. T. Zaksab, S. A. Matveevab, V. P. Shutyaeva

a Marchuk Institute of Numerical Mathematics of the Russian Academy of Sciences, Moscow
b Lomonosov Moscow State University

Abstract: A fast numerical method is proposed for the problem of restoring the source function in the Smoluchowski coagulation-fragmentation equation. The proposed method is based on the earlier work with a more detailed description of the transition from the coagulation-fragmentation equation to the final system of variational equations and the iterative process. Exploitation of the low-rank matrices has been introduced into this process to reduce the computational complexity of each iteration. The proposed methodology allows speeding up the calculations by thousands of times without losing the accuracy of the original approach.

Key words: Smoluchowski equation, inverse problem, numerical methods.

UDC: 519.6

Received: 10.01.2025
Accepted: 23.04.2025

DOI: 10.31857/S0044466925070033


 English version:
Computational Mathematics and Mathematical Physics, 2025, 65:7, 1671–1690

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© Steklov Math. Inst. of RAS, 2026