A ROUGHNESS SURFACE MODEL TO SIMULATE THE DRAG CRISIS USING A LAGRANGIAN VORTEX METHOD

Alex Mendonça Bimbato¹; Luiz Antonio Alcântara Pereira²; Miguel Hiroo Hirata³

¹ São Paulo State University; ² Federal University of Itajubá; ³ State University of Rio de Janeiro

doi:10.20906/CPS/COB-2015-0150

Resumo

The purpose of this work is to present a roughness surface model to be used with the mesh free vortex method to simulate numerically the flow past a circular cylinder. The roughness model is based on the physics sense that roughness surfaces may stimulate turbulent boundary layer flows. The second-order velocity structure function of the filtered field is used to take into account the sub-grid scale phenomena. The results obtained in this work show that the roughness model developed is able to stimulate turbulent boundary layer flows and to capture the drag crisis.

Palavras-chave: roughness model; sub-scale model; drag crisis; vortex method; panel method