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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
CFD STUDY ON THE INFLUENCE OF FREE SURFACE AND TURBULENCE MODELING ON THE FLOW AROUND A FIXED CIRCULAR CYLINDER WITH LOW ASPECT RATIO
Submission Author:
Pedro Lopes , SP
Co-Authors:
Pedro Lopes, Guilherme Rosetti, CELSO Pupo Pesce, Rodolfo Gonçalves
Presenter: Pedro Lopes
doi://10.26678/ABCM.COBEM2017.COB17-1003
Abstract
Offshore multi-column platforms as semi-submersibles (SS) and floating offshore wind turbines (FOWT) are ocean structures composed of a set of free surface piercing low aspect ratio (LAR) vertical circular cylinders. Under ocean current, vortex shedding phenomena take place, inducing what has been called Vortex Induced Motions (VIM). Fundamental studies on the vortex shedding phenomenon from LAR cylinders are still required. This paper brings a study on the influence of the boundary conditions and two different turbulence models on the flow and the drag coefficient. The model is constructed with the Star CCM® solver. The unsteady incompressible URANS (Unsteady Reynolds-Averaged Navier-Stokes) equations are dealt with a k-ω SST turbulence model (Shear Stress Transport) and DES turbulence model (Detached Eddy Simulation).
Keywords
CFD, cirular cylinder, low aspect ratio, three-dimensional free surface flow, Turbulence Models
