The code is written in Processing and uses Git for version control. Before working with Lily Pad you will need to get these two programs (both of these are cross platform, so get the flavour you need).
- Get a copy of Processing. They have an excellent wiki.
- Get a copy of Git. There are many nice git introductions.
Now you can download the Lily Pad program. You can use the buttons to the right to fork the Lily Pad project, making a clone of it in your own github account, or just download the Lily Pad source as a zipfile. Alternatively, open a command terminal and type
$ git clone https://github.com/weymouth/lily-pad
Now navigate to the lily-pad\LilyPad folder and open LilyPad.pde with Processing.
That's it! You're ready to run.
Once the source is opened in Processing, click the play button. The default set-up (a cylinder in a free stream) will run automatically. You can drag the cylinder around in the default set-up as well.
The main Processing file is LilyPad.pde and this file controls what happens when you click play. Each of the files in the LilyPad folder has an example code section commented out at the top. By replacing the contents of the LilyPad.pde file with these example code sections you can run a wide variety of simulations and explore the types of geometries, flow conditions, and visualizations available.