Which Plugin is used for this wind simulation?

Hi Guys,
First of all, I am very new to grasshopper, have used it only for one project therefore I would like to ask if any of you know this...

The attached images are from the presentation of my colleague in which he showed the wind flow simulation.

I'd really wanna know the name of the plug in used in this, if any of you recognize it.

Would really appreciate your answer

Sincerely yours,