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Strange behavior of a passive scalar in a linear velocity fieldстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
- Авторы: Elperin T., Kleeorin N., Rogachevskii I., Sokoloff D.
- Журнал: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
- Том: 63
- Номер: 4
- Год издания: 2001
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 046305
- DOI: 10.1103/PhysRevE.63.046305
- Аннотация: Abstract Damping (or growth) rates of a typical realization, mean-field and high-order correlation functions of a passive scalar (e.g., a number density of particles) advected by a linear velocity fields are estimated. It is shown that all statistical moments higher than the first moment and a typical realization of a passive scalar without an external pumping decay for both laminar and random incompressible linear velocity fields. Strong compressibility of a laminar linear velocity field can result in a growth of a typical realization and the high-order moments of a passive scalar. It is demonstrated that for a laminar compressible linear velocity field the flux of particles from the infinity does not vanish and the total number of particles is not conserved. For a random compressible linear velocity field a typical realization decays whereas the high-order moments of a passive scalar can grow. Comparison of the obtained results with those for dynamics of a passive scalar advected by a homogeneous isotropic and compressible turbulent flow with a given longitudinal two-point correlation function F=1-r2 is performed (where r is the distance between two points measured in the units of the maximum scale of turbulent motions). --------------------------------------------------------------------------------
- Добавил в систему: Соколов Дмитрий Дмитриевич