Car (AUDI) External Flow CFD Simulation, ANSYS Fluent Training


  • The problem numerically simulates the Car (AUDI) External Flow using ANSYS Fluent software.
  • We design the 3-D model by the Design Modeler software.
  • We Mesh the model by ANSYS Meshing software, and the element number equals 4950697.

Special Offers For Single Product

If you need the Geometry designing and Mesh generation training video for one product, you can choose this option.
If you need expert consultation through the training video, this option gives you 1-hour technical support.
The journal file in ANSYS Fluent is used to record and automate simulations for repeatability and batch processing.
editable geometry and mesh allows users to create and modify geometry and mesh to define the computational domain for simulations.
The case and data files in ANSYS Fluent store the simulation setup and results, respectively, for analysis and post-processing.
Geometry, Mesh, and CFD Simulation methodologygy explanation, result analysis and conclusion
The MR CFD certification can be a valuable addition to a student resume, and passing the interactive test can demonstrate a strong understanding of CFD simulation principles and techniques related to this product.



This project will study an incompressible isothermal air flow adjacent to an Audi-A4-2017 car by ANSYS Fluent software. The maximum speed of 77.76 m / s, which is relatively high, is selected for the testing, and the drag force value is obtained.

Car Methodology

The 3-D geometry of the model is designed using Design Modeler software. The present model includes a rectangular cubic computational domain with dimensions of 20 m * 10 m * 5 m for airflow, in which an AUDI vehicle is located.

The model meshing has been done using ANSYS Meshing software, and the mesh type is unstructured. The element number is 4950697, and the meshing accuracy is higher in the vicinity of the vehicle surfaces.

Car Conclusion

After the solution has been converged, the results could be observed through post-processing. Meanwhile, the drag value was monitored during the solution iterations to assure an excellent convergence.

In this study, the solution was a converged one when the drag force reached a constant value and the residuals were below 10-5 values. As the results show, most drag forces are due to pressure forces, and the share of frictional forces in drag is low.

The highest pressure occurred in the front and back of the car, which happened in these areas due to the minimum velocity contour. The velocity vectors indicate that there is flow separation at the front and rear of the vehicle.

This separation is more concentrated in the front of the car and is wider in the back of the vehicle, which can be attributed to the broader geometry in the back of the car. The pressure on the surface of the car body is almost evenly distributed, but in areas with a greater angle to the flow direction, this pressure is higher.

The more perpendicular the surface is to the flow, the greater the pressure on it. Also, the pressure on the sharp edges, especially on the front wheel and the edge of the front window, is negative, and the speed in these areas has increased, which can be attributed to the rapid change in the flow angle due to the change in fracture.

The Shear force contours also show that the flow separation started when these contours changed sign. The drag force obtained in this problem is 1684.74 Newtons.


  1. Carolyne McClure

    : What is the main objective of this Car Audi External Airflow CFD Simulation?

    • MR CFD Support

      This simulation aims to analyze the airflow around an Audi car, which is crucial for understanding the aerodynamic performance of the vehicle.

  2. Mr. Chase Hartmann PhD

    Can this simulation be used to improve the aerodynamic design of a car?

    • MR CFD Support

      Absolutely! The results from this simulation can provide valuable insights into the aerodynamic forces acting on the car, which can be used for design optimization.

  3. Hillary Towne

    The use of CFD in this simulation is truly innovative!

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