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On the problem of boundary conditions for mixed type equations arising in the description of astrophysical transonic flows

 a, b,  a
a Moscow Institute of Physics and Technology (National Research University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141701, Russian Federation
b Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation

Using the example of an exactly solvable problem, it is shown that the number of boundary conditions which is necessary to determine the transonic hydrodynamic flow near the so-called 'non-standard singular point' does not depend on whether the separatrix characteristic passes or does not pass through this point. Thus, the quite popular statement is called into question, according to which the critical surface, the regularity condition on which determines the flow structure, generally coincides with the surface of separatrix characteristics, and not with the sonic surface.

Keywords: hydrodynamics
PACS: 95.30.Lz
DOI: 10.3367/UFNe.2022.07.039217
Citation: Beskin V S, Khalilov T I "On the problem of boundary conditions for mixed type equations arising in the description of astrophysical transonic flows" Phys. Usp., accepted

Received: 2nd, February 2022, revised: 4th, July 2022, 8th, July 2022

Оригинал: Бескин В С, Халилов Т И «К проблеме граничных условий для уравнений смешанного типа, возникающих при описании астрофизических трансзвуковых течений» УФН, принята к публикации; DOI: 10.3367/UFNr.2022.07.039217

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