The unsteady aerodynamics of flapping low-aspect-ratio ellipsoidal-wings in ornithopters is analyzed and modeled by the use three dimensional Computational Fluid Dynamics (CFD) simulations. range interest high amplitude, moderate frequency flapping, low to angles attack at Reynolds around 105, where autonomous like GRIFFIN are able perform complex maneuvers such as perching. results obtained sh...

The present work studies the non-linear dynamics of a shear layer, driven by body force and confined between parallel walls, simplified setting to study transitional turbulent layers. It was introduced Nogueira \& Cavalieri (J. Fluid Mech. 907, A32, 2021), is here studied using reduced-order model based on Galerkin projection Navier-Stokes system. By considering layer with free-slip boundary co...

In this paper we consider a reduced order method for the approximation of eigensolutions Laplace problem with Dirichlet boundary condition. We use time continuation technique that consists in introduction fictitious parameter. POD approach and present some theoretical results showing how to choose optimal dimension basis. The our computations, related first eigenvalue, confirm behavior approxim...

The thermal behavior of a spherical gas bubble in liquid excited by an acoustic pressure signal is investigated constructing iterative solution the energy balance equations between and surrounding uniform approximation. This leads to hierarchy for radial partial derivatives temperature at wall, which control temporal rate change within bubble. In particular, closure relation introduced based on...

This paper presents a novel, more efficient proper orthogonal decomposition (POD) based reduced-order model (ROM) for compressible flows. In this POD the governing equations, i.e., conservation of mass, momentum, and energy equations were written using specific volume instead density. substitution allowed pre-computation coefficients system ODEs that make up model. Several methods employed to e...