Hybrid and Easy Discontinuous Galerkin Environment
hedge is an unstructured, high-order, parallel Discontinuous Galerkin (DG) code that I am developing as part my PhD project. hedge's design is focused on two things: being fast and easy to use. While the need for speed dictates implementation in a low level language, these same low-level languages become quite cumbersome at a higher level of abstraction. This is where the "h" in hedge comes from; it takes a hybrid approach. While a small core is written in C++ for speed, all user-visible functionality is driven from Python.
Since everybody loves bulleted lists, here's one for you. Hedge:
If you run into trouble, chances are that someone on the mailing list can help you.
hedge is available under the terms of the MIT License and is built using components that have source code available for free. (Sadly, the mesh generators and partitioner are not strictly open-source, but everything else is.)
Curious? Follow the simple build instructions on the wiki (see above).
Release downloads are available form Hedge's Python Package Index page.
You may also peek at the development version in my source control archive. To check out a copy, type:
git clone http://git.tiker.net/trees/hedge.git
In my opinion, GPU computing is significant because I--as a grad student--can easily afford a machine that allows me to perform a simulation like the following in 40 minutes instead of a whole workday. That's why.
If you're curious, this shows the density of a vortex shedding flow behind a square obstacle at Re=100 and Ma=0.1. The attentive viewer may notice a sound wave at the beginning as the system settles from uniform flow to flow around the obstacle, as well as the passing of a gentle density "nudge" intended to throw the system off balance and accelerate the onset of shedding. This was computed using my Discontinuous Galerkin solver hedge on an Nvidia GTX 260.
This work owes a lot to Hendrik Riedmann from IAG, Uni Stuttgart who wrote the initial version of the Navier-Stokes operator in hedge.
(Btw: did you notice how the movie cleverly avoids the typical criticism of being "CFD"--colorful fluid dynamics? :-)