A coalescence model for freely decaying two-dimensional turbulence

Дата и время публикации : 1998-08-18T09:42:03Z

Авторы публикации и институты :
Emmanuel Trizac

Ссылка на журнал-издание: Europhys. Lett. 43, 671 (1998).
Коментарии к cтатье: 6 pages, 1 figure, to appear in Europhysics Letters
Первичная категория: cond-mat.stat-mech

Все категории : cond-mat.stat-mech

Краткий обзор статьи: We propose a ballistic coalescence model (punctuated-Hamiltonian approach) mimicking the fusion of vortices in freely decaying two-dimensional turbulence. A temporal scaling behaviour is reached where the vortex density evolves like $t^{-xi}$. A mean-field analytical argument yielding the approximation $xi=4/5$ is shown to slightly overestimate the decay exponent $xi$ whereas Molecular Dynamics simulations give $xi =0.71pm 0.01$, in agreement with recent laboratory experiments and simulations of Navier-Stokes equation.

Category: Physics