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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL STUDY OF TANDEM SLENDER CYLINDERS ON A TURBULENT CROSSFLOW
Submission Author:
Patrick Habowski , RS , Brazil
Co-Authors:
Patrick Habowski, Roberta Fatima Neumeister, Adriane Prisco Petry, Sergio Viçosa Möller
Presenter: Patrick Habowski
doi://10.26678/ABCM.ENCIT2022.CIT22-0100
Abstract
This article presents a numerical study of a pair of fixed slender circular cylinders tandem placed to a turbulent crossflow. Spacing ratios (T/D) of 5, 7.5, and 10 were tested, where T is the horizontal distance between the cylinders with diameter D. The Reynolds number of the experiment was set as 6.67 × 10^3, computed for the cylinder diameter of 10 mm. Flow patterns, force coefficients, Strouhal number, and velocity fields were compared with literature numerical and experimental results. The setup with the fixed cylinders was computed employing the OpenFOAM software, and the mesh was generated by the gmsh open software. The conservation equations were solved by LES simulation with the k-dynamic turbulence model. The main results showed that the higher the T/D spacing ratio, the lower the mean flow velocity behind the downstream cylinder. On the other hand, an increase in the velocity fluctuations was observed with the increase of the T/D spacing ratio. Strouhal numbers obtained in this study presented a fixed value of 0.195, independent of the T/D spacing ratios. Flow visualization presented vortex reattachment in all the tested cases.
Keywords
Computational Fluid Mechanics, Flow-induced Vibrations, Slender Cylinders, Turbulent flow, Vortex shedding
