7038MAA Ground Vehicle Aerodynamics Management

7038MAA Ground Vehicle Aerodynamics Management

Question:

  1. Critically appraise the scientific principles of fluid dynamics and the techniques used for external aerodynamics development and testing;
  2. Relate flow phenomena to features of vehicle design, classify and categorize typical aerodynamic performance devices in terms of their effects on vehicle performance;
  3. Evaluate the capabilities of computer based models for solving fluid dynamics problems, and assess the limitations of particular cases, and the assumptions made;
  4. Implement design solutions and evaluate their effectiveness;
  5. Demonstrate the ability to apply a systems approach to external aerodynamics problems.

Tasks:

You will have to produce a report, which addresses the topics below (Marks are shown in brackets; All topics must be attempted).

From this analysis you are required to set up a CFD simulation to test the generic reference model DrivAer in Fastback configuration with a flat floor, disk wheels, no mirrors and closed cooling in the figure below. The geometry is provided in .dbs format and is available on Aula.

Figure 1. DrivAer Fastback configuration.

For the CFD analysis the following topics need to be addressed:

1.Discuss why the size of the wind tunnel is important when setting the boundary conditions (focus your attention on the blockage ratio).

2.Show the distribution of y+ around the model and discuss how y+ values can affect the velocity flow field near the wall.

3.Show evidence of mesh independency.

4.Perform a quality control check on your simulation:

  • Analyse your residuals, drag and lift coefficient plots, and comment on convergence.
  • Plot pressure coefficient (Cp) and check the stagnation value of Cp with theoretical values (you will have to customize the Cp field function).

5.Tabulate your results (drag, lift and pitch moment coefficients). Are the drag and lift coefficients similar to what you would expect from the DrivAer Fastback in this configuration? If any, where do the differences come from? (use the extensive resources available to compare your results)

6.Investigate the flow structure generated around the car and identify specific flow features associated with the particular shape (use the wide range of post-processing tools available).

In the appendix add as many images showing your boundary conditions setup, mesh setup (on the car surface, prism layers, wake refinement) to support the “mesh quality” aspect of this topic, residual plots and monitor plots for the “convergence)

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