What is the radiustowidth ratio of a rounded comer needed to

What is the radius-to-width ratio of a rounded comer needed to provide a 15% reduction in overall drag for the front-end of a van or the cab of a tractor trailer truck? In computational fluid dynamics analysis of automobiles, why are tetrahedral-only grids generally considered inappropriate? True or False. To calculate traction force required for a ground vehicle, the effective vehicle mass in the acceleration resistance term is corrected to account for the inertia of rotating components.

Solution

1. It is around 5%

2.anisotropic tetrahedral elements, due to a significant reduction in numerical diffusion. ..... Meshing can be considered as a bottleneck in the CFD process.Hence it is cosidered as in apropraite

3.We have to cosidered the inertia force also hence it is true