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JOURNALS // Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika // Archive

Izv. Vyssh. Uchebn. Zaved. Mat., 2024 Number 5, Pages 79–84 (Mi ivm9982)

This article is cited in 2 papers

Brief communications

Exact formulas for estimating the area of flow regions in free boundary problems

M. M. Alimov

Kazan Federal University, 18 Kremlyovskaya str., Kazan, 420008 Russia

Abstract: An effective technique is proposed for obtaining exact formulas for estimating the area of flow regions in two-dimensional fluid flow problems with free boundaries, that allow an exact solution in terms of elliptic functions. The effectiveness of the technique is demonstrated using a specific example of the problem of capillary waves on the surface of a liquid of finite depth. This example is characterized by mirror symmetry of the flow region, but the technique can be generalized to the case of other symmetry of the flow region.

Keywords: potential flow, complex variable, elliptic function, residue.

UDC: 517.583: 532.5

Received: 09.02.2024
Revised: 09.02.2024
Accepted: 20.03.2024

DOI: 10.26907/0021-3446-2024-5-79-84


 English version:
Russian Mathematics (Izvestiya VUZ. Matematika), 2024, 68:5, 66–71


© Steklov Math. Inst. of RAS, 2026