NUMERICAL STUDY OF THE VORTEX-INDUCED VIBRATIONS OF AN ELASTIC CIRCULAR CYLINDER WITH 1 DEGREE OF FREEDOM USING OPENFOAM
J. M. P. Conde1; R. M. V. Lopes1
1 Unidemi, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa
doi:10.20906/CPS/COB-2015-2624
Resumo
This paper presents a validation of the numerical code OpenFoam to problems with the vortex-induced vibration (VIV) phenomenon. This code was applied to the uniform flow past a circular cylinder that is allowed to move with 1 degree of freedom in the transverse direction to the flow. Firstly the flow around a fixed cylinder is simulated, and then is simulated a flow around an elastic cylinder. The Reynolds number is 200 for all simulations and the cylinder motion is described according to a mass-spring or a mass-spring-damper systems. The simulations were performed by solving the 2D Navier-Stokes equations. In the simulation of the flow around the fixed cylinder, the drag and lift coefficients and Strouhal number, were calculated and compared with results from other authors. The results obtained are similar those of other authors, however it was noticed that the discretization and domain size are very important for the accuracy of the results. In the simulations of the flow around the elastic cylinder (mass-spring or mass-spring-damper systems), drag and lift coefficients and the cylinder displacement were calculated. The results obtained in this study were satisfactory and it is concluded that the OpenFoam code is a reliable tool to solve problems with the VIV phenomenon.
Palavras-chave: Elastic cylinder; Vortex-induced vibration; OpenFoam; Navier-Stokes