Never forget GIGO

The field of engineering has been radically changed by the development of the computer. Over the last 50 years computers have shrunk from being the size of a large room to being the size of a deck of cards. Even while the size of computers has continued to shrink, the processing power of computers has increased dramatically. Programs which used to require a super computer can now be performed on a small desktop, or even laptop, computer. As computing power increased, engineers moved from using slide rules to using electronic calculators and then to desktop computers to perform their routine work. 

Today these computers are running advanced software that can solve complex problems that
 were virtually impossible to solve in the past. Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) software are examples of these advanced software packages. Many of these packages include advanced simulation features such as Fluid Structure Interaction (FSI) where stresses and deformations within solids created by a fluid flowing around the solid are calculated and then the effect of the solid upon the fluid is calculated. There are many other examples of sophisticated software being used today to design advanced machines and structures.

No matter how fast a computer can perform operations or how sophisticated the software is or how "pretty" the output from these programs is, there is one rule that MUST NOT be forgotten:

GARBAGE IN = GARBAGE OUT