I am currently learning ANSYS Fluent for my research. There are also many great YouTube videos about this. To inspire myself to keep learning and also to record part of life, I want to summarize the analysis results of transient flow over a cylinder in this post.

To capture the famous Von Karman Street, and also to understand why the flow at low Reynolds number could be considered as steady, the Reynolds number 10 and 100 are adopted in transient analysis. A great YouTube video for you to better understand the theory, the link is here. 

Case 1: Re = 10

Case 2: Re = 100

To better view the change of flow after the cylinder, the vectors are shown below.

Case 1: Re = 10

Case 2: Re = 100