## Introduction

CFD stands for Computational Fluid Dynamics. It is a branch of fluid mechanics that uses numerical methods to analyze and solve fluid flow problems. Computers are used to simulate and solve the interaction between the fluid and engineering surfaces like airplane wings.

## What are Fluids?

Fluids are substances which continually deform (flow) under an applied shear stress. Fluids are commonly divided into liquids and gases.

## What are the basic equations of CFD?

For any single phase fluid flow, the governing equations are called the Navier-Stokes equations. These equations are derived by applying Newton's second law of motion (F = ma) to viscous fluids.

## Why is CFD important when studying industrial flows?

Most industrial flows are turbulent by nature. That is, these flows have chaotic changes in pressure and flow velocity. Solutions to these flow problems can only be approximated using CFD since analytic solutions do not exist. Indeed, finding analytic solutions to turbulent flows remains one of the last great problems in classical physics.