openQmin is an open-source software package for numerical modeling of nematic liquid crystals and their topological defects.

In particular, openQmin applies relaxation methods to minimize the widely used Landau-de Gennes free energy functional under user-defined boundary conditions. Developed by Daniel Sussman (Emory University) in collaboration with our group, openQmin has the following features:

Open-source: Free to download, use, and edit

Accessible: Comes with a graphical user interface (GUI) for “real-time” manipulation of the nematic’s environment. Visualization routines in Mathematica and Python are also provided.

Fast: Allows utilization of GPU or CPU resources, and uses efficient minimization routines like the Fast Inertial Relaxation Engine (FIRE).

Scalable: Uses MPI parallelization to scale modeling volume up to ~ 1000 times larger than possible on a single CPU, accessing supra-micron scales often closer to experimental dimensions.

Adaptable: User-defined boundary conditions

Our peer-reviewed article on openQmin is published at Frontiers in Physics, 7 (2019) 204 [arXiv].

openQmin‘s GUI
Example modeling results for nematic topological defects in a droplet and around colloidal particles.