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COBEM 2019
25th International Congress of Mechanical Engineering
On the Suitably of RANS Turbulence Models for Modeling Circular Bluff-Body Configurations
Submission Author:
Ricardo Franco , Lima , Peru
Co-Authors:
Ricardo Franco, Cesar Celis, Luís Fernando Figueira da Silva
Presenter: Ricardo Franco
doi://10.26678/ABCM.COBEM2019.COB2019-1453
Abstract
This work discusses the suitability of different turbulence models for modeling circular bluff-body configurations. Accordingly, the context in which the associated numerical simulations are carried out is initially described. Next, different turbulence models are assessed using a Reynolds-averaged Navier–Stokes (RANS) approach. Particular turbulence models accounted for include the standard k-ε, the k-ω SST, the quadratic k-ε developed by Shih et al. (1995), and the cubic k-ε model developed by Lien et al. (1996). The numerical results obtained here are compared to experimental data gathered previously (Cruz and Figueira, 2016). From the OpenFOAM-based numerical simulations carried out, velocity profiles for axial and radial components, turbulent kinetic energy (TKE) components, as well as contours for these variables, are computed. The main results indicate that the standard k-ε and quadratic k-ε models overestimate the recirculating bubble length and underestimate the TKE. The quadratic model shows better results however regarding the TKE. On the other hand, the cubic k-ε and k-ω SST models show a better agreement with the experimental data when the TKE and recirculating bubble length are accounted for. Using the cubic k-ε model however, the velocity gradients are underestimated similar to what was observed in the case of the velocity profiles. The results encourage further research into Non-Linear Eddy Viscosity models (NLEVM) as an alternative to Reynolds Stress Modelling (RSM) and Large Eddy Simulation (LES), for predicting the turbulent flow around circular bluff-body configurations.
Keywords
bluff body, Turbulence Models, Reynolds Averaged Navier-Stokes, OpenFOAM
