Best tool for airflow analysis of small parts?

I’m currently designing 3D printer parts - some of which include ducts and shrouds for small cooling fans. I’d like to do some fluid dynamics analysis and was wondering what the most ideal Grasshopper (or Rhino) toolset would be for this application.

I did see the Butterfly CFD and RhinoCFD plugins; however, they appear to be more directed toward architectural and environmental analyses.

The image below is an example of a part I would like to analyze. Any information would be greatly appreciated!