Context from the homepage (https://flow5.tech):

An analysis tool for planes and sails operating at low Reynolds numbers

flow5 is a potential flow solver with built-in pre- and post processing functionalities. Its purpose is to make preliminary designs of wings, planes, hydrofoils and sails reliable, fast and user-friendly.

With so many things being called Flow these days, this one is probably the most fitting.

Source code: https://github.com/techwinder/flow5

Make it work for paper airplanes and you have a nice teaching tool.

>Performance scales with the speed and number of processor threads.

music to my ears. I wish more software had similar rules.

Certain types of (numerical) problems are very parallel in nature. LLMs, for example. But obviously not every problem is. And sometimes a parallel solution isn't the most efficient.

We used sail7 for our sailboat, and this was already open-sourced. https://xflr5.tech/sail7/sail7.html

Curious that this hit the front page.

What kind of projects is this software used for?

> Its purpose is to make preliminary designs of wings, planes, hydrofoils and sails reliable, fast and user-friendly.

From the main project page. So it’s for designing aircraft, mostly.