Numerical Study For Flow Over A Realistic Generic Model, DrivAer, Using URANS

Nur Haziqah Shaharuddin; Mohamed Sukri Mat Ali; Shuhaimi Mansor; Sallehuddin Muhamad; Sheikh Ahmad Zaki

Authors

Nur Haziqah Shaharuddin Wind Engineering for Environment, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia
Mohamed Sukri Mat Ali Wind Engineering for Environment, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia
Shuhaimi Mansor Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
Sallehuddin Muhamad Razak School of Engineering and Advanced Technology, Universiti TeknologiMalaysia, 54100 Kuala Lumpur, Malaysia
Sheikh Ahmad Zaki Wind Engineering for Environment, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia

Keywords:

CFD, DrivAer , Grid Convergence Index, OpenFOAM simulation , URANS

Abstract

The aim of this study is to present a systematic approach for the grid convergence analysis in simulating flow around a realistic generic model, DrivAer. The numerical simulation is modelled using unsteady Reynolds Averaged Navier-Stokes (URANS) equation. A minimum of three different grid resolutions are considered, which are fine, medium and coarse in order to investigate the grid independency. Richardson extrapolation and Grid Convergence Index (GCI) are introduced to quantitatively evaluate the grid independency. Based on the results between those three different grids, a monotonic convergence criteria has been achieved. The reduction in GCI value indicates that the grid convergence error has been significantly reduced, in which the fine grid has a GCI value less than 7%. Additionally, the result from the fine grid is only 6% difference if compared with previous experimental study.