Passive advection of a vector field: Anisotropy, finite correlation time, exact solution, and logarithmic corrections to ordinary scaling

Результат исследований: Научные публикации в периодических изданияхстатья

23 Цитирования (Scopus)

Аннотация

In this work we study the generalization of the problem considered in [Phys. Rev. E 91, 013002 (2015)] to the case of finite correlation time of the environment (velocity) field. The model describes a vector (e.g., magnetic) field, passively advected by a strongly anisotropic turbulent flow. Inertial-range asymptotic behavior is studied by means of the field theoretic renormalization group and the operator product expansion. The advecting velocity field is Gaussian, with finite correlation time and preassigned pair correlation function. Due to the presence of distinguished direction n, all the multiloop diagrams in this model vanish, so that the results obtained are exact. The inertial-range behavior of the model is described by two regimes (the limits of vanishing or infinite correlation time) that correspond to the two nontrivial fixed points of the RG equations. Their stability depends on the relation between the exponents in the energy spectrum E∝k1−ξ⊥ and the dispersion law ω∝k2−η⊥. In contrast to the we
Язык оригиналаанглийский
Страницы (с-по)043018
ЖурналPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Том92
Номер выпуска4
DOI
СостояниеОпубликовано - 2015

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