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Computational Fluid Dynamics (CFD) has become one of the main design tools for the automotive industry, where the complex and numerous turbulent structures around the car must be captured properly to obtain accurate results. This thesis aims to study the grid convergence of the flow structures around a car model for Lattice Boltzmann CFD simulations. The DrivAer model, an open-source realistic car model has been selected to carry out this study.
A grid parameter space has been defined attending to the critical areas of the car. The individual influence of these parameters over different regions of the flow-field have been treated and divided into direct and non-direct effects. Grid sensitivity results for the flow behavior around the whole car have been obtained. Based on the study of the flow behavior differences, some general conclusions are given. The results obtained in this study will be used to establish new guidelines which permit an improvement in the simulation performance of this software in the future.