This is a post by Tiffany Bailey on PTC site.
3D CAD has become so easy to use that almost anyone with a good eye can make great-looking designs—especially with modern rendering capabilities that add realistic-looking materials and strategically positioned lights to the model.
But no matter how good those race cars and robots look, if they don’t have good data behind them, they may not get past prototyping. In fact, they may not even be buildable.
That’s why most product developers do more than design. They engineer. Using equations and simulation tools, they determine up front what will work under real-world conditions and what won’t.