Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
NUMERICAL STUDY OF FLOW AROUND OSCILLATING SIMPLE GEOMETRIES USING POROUS MEDIUM
Submission Author:
Gustavo de Goes Gomes , SP
Co-Authors:
Gustavo de Goes Gomes, Joao Lucas Dozzi Dantas Dantas, Gustavo Roque da Silva Assi
Presenter: Gustavo de Goes Gomes
doi://10.26678/ABCM.COBEM2019.COB2019-1531
Abstract
This paper presents an initial CFD analysis using a porosity model to represent the hydrodynamic perturbation of two elementary geometries under forced oscillations in a simplified way. The oscillation is used to represent a subsea equipment in a lifting, or deploying process, under a ship heave motion. The chosen geometries are disk plates and cubes, initially without porosity, in order to do a validation of the model, and later with porosity. These geometries are forced to oscillate under a sinusoidal motion inside water. The Keulegan-Carpenter number, in relation to the disk diameter or cube edge, spans from 0.25 to 1.50, and the porosities from 0 to 20%. The added mass and damping coefficients are calculated from the obtained hydrodynamic forces, and compared with experimental data present in the literature. For the porosity scenarios, a porous medium model is adopted rather than the actual geometry, the hydrodynamical forces are calculated, and the permeability coefficients are set in a iterative manner. The differences in flow patterns are then analyzed. It is expected in future works that with this study it will be able to simulate bodies with greater complexity with meaningful force outputs and accessible computational cost.
Keywords
porous medium, damping, added mass, Numerical Study, Oscillating flow
