River bends are one of the common elements in most natural rivers, and secondary flow is important features bends. The perpendicular to main has a helical path moving towards outer bank at upper part river cross-section, inner lower cross-section. causes redistribution flow. Accordingly, this sediment transport by may lead formation typical pattern bend profile. It study understand order predic...

The evolution of a turbulent boundary layer over truncated cones in staggered and random configurations is investigated using direct numerical simulations. Three planform densities one staggered, which closely match the configuration recent experiment by Womack et al. ( J. Fluid Mech. , vol. 933, 2022, A38), are considered. also used to validate present computations found reproduce flow measure...

Baraviera and Bonatti in [1] proved that it is possible to perturb, in the Ctopology, a volume-preserving and partial hyperbolic diffeomorphism in order to obtain a non-zero sum of all the Lyapunov exponents in the central direction. In this article we obtain the analogous result for volume-preserving flows. MSC 2000: primary 37D30, 37D25; secondary 37A99. keywords: Dominated splitting; volume-...