Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
NUMERICAL STUDY OF FLOW OVER SINGLE CYLINDERS: A FIXED CYLINDER AND A CYLINDER FREE TO VIBRATE
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.COBEM2019.COB2019-0223
Abstract
The purpose of this paper is to present the main characteristics on a flow over a fixed single cylinder and a single cylinder free to vibrate to observe the main changes generated by freedom to vibrate. The vibration amplitude and dominant frequencies are also studied with changes in the reduced velocity and natural frequency. The twodimensional and three-dimensional simulations are executed in ANSYS Fluent 18 using URANS (Unsteady Reynolds Averaged Navier Stokes) with turbulent model kω-SST. For the simulations with freedom to vibrate the moving mesh is applied. The tested Reynolds number ranges between 213 and 21.3x10³ and the reduced velocity changed between 0.62 and 166. Fixed cylinder and free to vibrate cylinder present variations in the amplitude of the vortex street. The results present the non-dimensional amplitude, the power spectrum and vortex shedding pattern for the tested cases and show that the changes in the patterns of vortex shedding are linked to the increase in the vibration amplitude. The power spectrum showed frequencies agreeing with the natural frequency and the vortex shedding frequency. The results of pressure field show a region of influence around the cylinder higher than in the cylinder free to vibrate.
Keywords
Numerical analysis, Fixed Cylinder, Free to vibrate Cylinder
