As an exercise, we will add more complexity to the simulation that pertains to a more realistic problem. We will first see how we can add obstruction to the original artery geometry. These can be thought of as blockages that build up over time. Next, we will learn how we can add a stent to the original artery geometry. Lastly, we will see how we can implement a Casson fluid model using a User Defined Function (UDF) in Ansys Fluent.