Aerodynamic Drag Reduction for a Generic Truck Using Geometrically Optimized Rear Cabin Bumps

Table 3

Optimum design obtained by orthogonal arrays.

					% reduction
4	0.040	0.267	0.082	0.031	8.67
2	0.081	0.308	0.100	0.029	9.05
7	0.071	0.073	0.094	0.031	6.47
6	0.073	0.400	0.104	0.036	8.88
5	0.093	0.183	0.093	0.027	9.03
3	0.088	0.334	0.078	0.062	9.83