title: Closure of two-dimensional turbulence: the role of pressure gradients.
abstract: Inverse energy cascade regime of two-dimensional turbulence is investigated by means of high resolution numerical simulations. Numerical computations of conditional averages of transverse pressure gradient increments are found to be compatible with a recently proposed self-consistent Gaussian model. An analogous low-order closure model for the longitudinal pressure gradient is proposed and its validity is numerically examined. In this case numerical evidence for the presence of higher-order terms in the closure is found. The fundamental role of conditional statistics between longitudinal and transverse components is highlighted.
authors.affiliation: Dipartimento di Fisica Generale and INFM, Università di Torino, Via Pietro Giuria 1, I-10125 Torino, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Boffetta
authors.forename: M
authors.initials: M
authors.lastname: Cencini
authors.forename: J
authors.initials: J
authors.lastname: Davoudi