Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
BLOCKAGE RATIO INFLUENCE ON FLOW OVER CYLINDERS WITH TANDEM CONFIGURATION L/D = 1.26
Submission Author:
Roberta Fatima Neumeister , DF
Co-Authors:
Roberta Fatima Neumeister, Adriane Prisco Petry, Sergio Viçosa Möller
Presenter: Roberta Fatima Neumeister
doi://10.26678/ABCM.ENCIT2020.CIT20-0453
Abstract
The present study preliminary explores the influence of the blockage ratio on aerodynamic characteristics and flow pattern of cylinders in tandem with L/D =1.26. The blockage ratio is the relation between the cylinder diameter and the width, D/B, varies from 67% to none. The Reynolds number, based on the inlet velocity and cylinder diameter, is fixed in 1.35 x 104 for all the tested cases. The analyzes are performed with numerical simulations using Reynolds Averaged Navier-Stokes with kw - SST (Shear Stress Tensor) turbulence model. The results indicate an increase in the magnitude of the drag and lift coefficient with the increase in the blockage ratio. The drag coefficient on the first cylinder increased with the increase in blockage ratio for all tested cases. The drag coefficient in the second cylinder presents inversion in the acting force with a blockage ratio higher than 26%. The lift coefficient showed significant changes with the increase in the blockage ratio mainly to 67%. The flow patterns present different structures and the occurrence of reattachment of the first cylinder shear layer with the increase in the blockage ratio.
Keywords
Blockage ratio, cylinders, Tandem
DOWNLOAD PDF VIEW PRESENTATION
