Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
SHEDDING VORTEX IN THE NEAR WAKE OF A CYLINDER ARE ANALYZED FROM THE NUMBER OF STROUHAL CHANGING THE METHODS OF NUMERICAL DISCRETIZATION
Submission Author:
Elcilane Freitas , PR
Co-Authors:
Elcilane Freitas, Letícia Castelo Branco, Erick Oliveira do Nascimento, André Araujo, Erb Lins
Presenter: Erick Oliveira do Nascimento
doi://10.26678/ABCM.COBEM2019.COB2019-2089
Abstract
Problems involving flow past cylindrical structures are common, physical phenomena concern from the formation of permanent vortices to turbulent vortices, passing through vortices formed in the Reynolds laminar region, forming the Von Karman vortex. The description of these vortices can be performed by numerical analysis using the finite volume method. However, several algorithms are modeling the phenomenon, being necessary to compare them with experimental results and to evaluate what is best suited to each case. Thus, a numerical flow model was developed past a cylinder using the PISO and SIMPLE pressure-velocity coupling methods and the second-order Upwind spatial discretization schemes and the third-order MUSCL, the results were compared with experimental results existing in the specialized literature. Shedding vortex is simulated lift and drag coefficients are also verified (CL and CD), with a turbulent flow for Re = 150. The frequencies of the lift oscillations obtained in the reviewed literature agree well with experimental results simulated from the calculated Strouhal number. It was observed that the methods give very approximate results, but with different processing times.
Keywords
Von Karman vortex, Strouhal number, Upwind second-order, Third-order MUSCL.
