In this article, I will share basic smooth pipe simulation using ANSYS FLUENT. Below, you will learn: How to simplify geomety, and why it is important? How to understand you have enough/right mesh for your simulation? How to setup periodic boundary condition? How to get Nusselt Number? At the end, we will compare hand calculation and numerical result which is called verification, to see how simulation differs from formulation. We have basic smooth pipe with below fluid proper

Periodic boundary condition (periodic BC) is very useful and time saving feature when you working with repeating geometries. With Periodic BC, you will have less number of mesh elements, so faster simulation to get results. In this example, we have 25mm diameter, 50mm long smooth pipe and we will see how to avoid errors while setting up periodic boundary conditions. Let's start with Fluent Meshing, then I will show how to match periodic faces in classical meshing window. Afte