External flow analysis of Learnsolidworks.com Aston Martin One-77. While the surface model is not suitable for CFD as it is massless, an attempt was made to simulate relative motion between air and the car travelling at 31.3 m/s (102.6 ft/s of 70 mph). This was achieved by thickening, offsetting and/or sculpting key areas to make thin solids. By inspection of the flow trajectories, it can be seen that the analysis was not perfect, with flow penetrating the chasis; a true evaluation would require a full rebuild of the model. However, for indication purposes only, the work was considered acceptable.