Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
LAGRANGIAN VORTEX METHOD WITH IMPROVED BOUNDARY CONDITIONS TO STUDY THE AERODYNAMICS OF BLUFF BODY CLOSE TO A MOVING GROUND USING LAGRANGIAN LARGE EDDY SIMULATION
Submission Author:
Crystianne Lilian Andrade , MG
Co-Authors:
Crystianne Lilian Andrade, Alex Bimbato, Luiz Antonio Alcântara Pereira
Presenter: Crystianne Lilian Andrade
doi://10.26678/ABCM.ENCIT2018.CIT18-0688
Abstract
This numerical study is related to the determination of aerodynamic loads of a circular cylinder near a moving ground by using a two-dimensional purely Lagrangian vortex method. The purpose of this paper is to discuss a numerical techniques to impose improved boundary conditions on solid walls, and then reduce the time spend to satisfy the boundary conditions on solid walls. The body surface is discretized into M small straight panels. At each time step of the simulation, M new nascent Lamb-Oseen vortices are created a small distance ε off the body surface, just above of the panel control points, and M new sources with constant density are created on the M panels. The strengths of these new vortices elements and sources distributions are determined by imposing the no-slip and the impermeability conditions respectively. Two additional equations are necessary to ensure global circulation and mass conservation. The procedure above described yields in two different kind of algebraic systems to be solved independently. The flow past a circular cylinder in the subcritical flow regime is simulated and the results obtained, using each kind of algebraic system, are compared with experimental results available in the literature to validate the two numerical techniques.
Keywords
Vortex Method, Moving Ground, Aerodynamic Loads, reduction of the computational cost, Lagrangian description
