user defined drag interaction

Hello,

after a successful installation I got to do a few tutorials and I must say that I like the python interface a lot. It's very intuitive and versatile. I am interested in doing some fairly simple monosize particle calculations in boxes with either walls or periodic BCs. I would first like to reproduce Maxwell like velocity distributions with just collisional interaction and then move to slightly more complex case. The more complex scenario involves drag with the medium which may vary continuously with x,y,z position. It's probably similar to your linDamping model, but the medium is not quiscent but has a say linear velocity profile.

Is there a model for this in Esys already or do I need to dig deeper into the code to build my own classes for this?

PS I wrote a package for Arch User Repository for Esys. I need to update the dependencies, but when I am done with it, Esys could be easily installed on Arch Linux.