Research on the effect of control angle on aerodynamic forces applied to cars using the Les Method and CFD application simulation

In this paper, the Large Eddy Simulation (LES) flow modeling technique is used to solve the Navier-Stokes equations. In this, the effect of the stress components from the small structures is modeled by the Smagorinsky flow model. This mathematical model is used for the flow through a square cylinder at two different Reynolds number conditions Re = 400 and Re = 22,000. The computed results of the average flow and the features of the multi-dynamic components are compared with the results obtained from the DNS (Direct Numerical Simulation) method and the k-ε model, demonstrating the benefits of this method. Simultaneously, these results also align well with the experimental results at the same Reynolds number conditions. Nowadays, the automobile industry is increasingly developing, along with the requirements of reducing fuel consumption, the design of cars with good aerodynamic shape is of interest to many countries in the world. Therefore, reducing aerodynamic drag is one of the issues that car designers put first. The method of simulating fluid flow through the car uses the finite volume method for unstructured mesh, using Fluent software based on the Reynolds Navier - Stokes average equation and the standard k - ε turbulence model. The accuracy of the problem depends on the number of grid points and the computer resources. The problem is solved by the sequential solution method. The simulation results are shown in intuitive graphics, which are the pressure and velocity distribution fields.