The lock-in and drag amplification phenomenon is studied in a flexible cantilever using a simplified fluid-structure interaction (FSI) algorithm. NavierStokes equations for incompressible flow have been solved in 2D in several transverse planes of the line-like structure. A fractional step scheme has been used to solve the fluid field. In each fluid plane, the displacements have been taken into account considering an Arbitrary Lagrangian Eulerian (ALE) approach. The stabilization of convection and diffusion terms has been achieved by means of orthogonal quasi-static subscales. No turbulence model has been included. In order to solve the structural problem, a monodimensional element for thin walled cross-section beams has been considered. The standard second order Newmark method has been used to include the dynamical behaviour equations. The wind has been considered to be an incompressible fluid acting on the structure in a series of planes that are independent among them, and transverse to the structure. For each period of time, the fluid problem was solved, the aeroelastic analysis was carried out, and the geometry of the mesh of each fluid plane was updated according to the structure displacements.
The analysis of the interaction between the flow and the fluid and an object represents a classical challenge for modern numerical techniques. Current work will concentrate on the case of bluff-body cross-sections featuring sharp corners and a clear predominance of the shape resistance over the friction resistance. For this category of structures the dynamic behaviour of the overall coupled system plays a very important role. In this work, the interest focuses on the behaviour of a beam structure subjected to a flow orthogonal to the beam axis. Under this assumption the flow at two points, at reasonable distance, will present little correlation, which allows to consider the flow at one point as uncoupled from the flow at other points along the same beam. This suggests the possibility of "slicing" the fluid domain in a number of independent two-dimensional planes on each of which the problem can be solved separately. Conceptually the solution on each slice will provide a force density acting on the beam, obtained by integrating the pressure of the fluid over the corresponding cross-section. This can be interpreted as a time-varying distributed load over the beam. The aeroelastic analysis of a slender beam is performed coupling a Navier Stokes Solver with the structural model. In the analysis of the structure is used a monodimensional structural model applicable to thin−walled composite beams, which can have either an open or closed profile with either a single-or multiplecell section. However, in the application example presented here, a steel chimney 90 meters tall is analyzed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.