The images above show the surface model. Due to its surface properties, the model is not being used for the FEM simulation itself. Instead, it provided an in-depth understanding of the Tesla design and the features. Based on insights gained in the modelling process, a simplified 3D body could be modelled in the free form application of SIemens NX.
This simple 3D model in the first image was used as a reference body. 11 design changes were applied individually before the FEM simulation ran the program for a driving speed of 80km/h on a straight road. The results of each individual change were evaluated to assess design changes that have a beneficial effect on the aerodynamic properties of the model. 5 of the applied changes improved the aerodynamic properties and were used together to create the improved 3 model.
The graphical comparison between the reference body and the improved version shows improved airspeeds and related pressures. Especially the zone in front of the car, the transition front hood to front shield and the cone at the back of the car were reduced. During the process of this project, I heard about the new Model 3 of Tesla, which was supposed to have even better aerodynamic properties than the Model S. Comparing my simplified models with theirs, differences (between Model S - Model 3 and Reference - Improved model) are partly similar and may confirm the trend. This project was limited in time and resources and could not realistically represent the actual airflow around a detailed car model.
Aerodynamic - Tesla Model S
This project is based on the advanced functions of NX and its numerical analysis functionalities. The Tesla Model S was chosen as a test subject and remodelled, first as a surface model and later on in the process as a simplified 3D model. An aerodynamic investigation of the exterior vehicle design properties was the outcome.
Individual Project: Surface Modelling, FEM investigation, Data Evaluation, Siemens NX