On global in time self-similar solutions of Smoluchowski equation with multiplicative kernel

• Published in: IMA journal of applied mathematics Vol. 88; no. 2; pp. 405 - 428
• Main Authors: Breschi, G, Fontelos, M A
• Format: Journal Article
• Language: English
• Published: Oxford University Press 01.06.2023
• Subjects: global existence; smoluchowski coagulation equation; similarity solutions
• ISSN: 0272-4960; 1464-3634
• DOI: 10.1093/imamat/hxad012

Abstract We study the similarity solutions (SS) of Smoluchowski coagulation equation with multiplicative kernel $K(x,y)=(xy)^{s}$ for $s<\frac{1}{2}$. When $s<0$ , the SS consists of three regions with distinct asymptotic behaviours. The appropriate matching yields a global description of the solution consisting of a Gamma distribution tail, an intermediate region described by a lognormal distribution and a region of very fast decay of the solutions to zero near the origin. When $s\in \left ( 0,\frac{1}{2}\right ) $, the SS is unbounded at the origin. It also presents three regions: a Gamma distribution tail, an intermediate region of power-like (or Pareto distribution) decay and the region close to the origin where a singularity occurs. Finally, full numerical simulations of Smoluchowski equation serve to verify our theoretical results and show the convergence of solutions to the selfsimilar regime.