Computational Fluid Dynamics (CFD) and structural analysis play a significant role in the development of technical devices, building construction, weather predictions, biochemistry processes modeling, and in many other fields. With regard to increase computational power increase and improvements in computer modeling techniques, it is expected that the numerical simulations will prevail the traditional methods, such as the experiments and analytical solutions, in the near future. Behind computer modeling, there are complex mathematical apparatuses, physical theories, chemical reactions, etc. Together, these factors make it difficult to understand and use CFD and structural analysis. This book attempts to systematize and provide an easy explanation of computer modeling.