IllinoisGRMHD Working Group

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Related Working Groups

Matter Codes Working Group: (link to Google Doc)


Lead: Zach Etienne (Please contact if interested in joining!)

  • Shohreh Abdolrahimi (Cal Poly Pomona),
  • Ashok Choudhary (WVU),
  • Furqan Dar (Washington U. St Louis),
  • Zach Etienne (WVU),
  • Cunwei Fan (UIUC)
  • Francisco Guzman (Universidad Michoacana de San Nicolás de Hidalgo),
  • Bhavesh Khamesra (GA Tech),
  • Pablo Laguna (GA Tech)
  • Elias Most (Frankfurt Institute for Advanced Studies)
  • Christos Tzounis (Cal Poly Pomona)


  • NASA ATP ATP13-0077
  • WVU
  • NSF 1550551 (Grant provides funding for the Einstein Toolkit, on which IllinoisGRMHD depends)

Approval date

Approved in ET call on 2017-11-27.


Over the past decade, the Illinois Numerical Relativity (ILNR) Group's dynamical spacetime GRMHD code has proven itself as one of the most robust and reliable tools for theoretical modeling of GRMHD phenomena. Despite the code's outstanding reputation, it was written "by experts and for experts" of the code, with a steep learning curve that would severely hinder community adoption if it were open-sourced.

IllinoisGRMHD is an open-source rewrite of the original closed-source GRMHD code of the ILNR Group, aimed at minimizing the learning curve, with the goal of facilitating community involvement in the code's development, as well as the minimization of human effort in generating new science. IllinoisGRMHD also saves computer time, generating roundoff-precision identical output to the original code on adaptive-mesh grids, but nearly twice as fast at scales of hundreds to thousands of processor cores.

Current Development Dec 12, 2019 Update

The latest IllinoisGRMHD development (largely driven by Leonardo Werneck) is taking place in two repositories:

  • IllinoisGRMHD with hybrid equation of state support (piecewise polytrope for cold part, plus Gamma-law for thermal part) is developed here. (One need only run all the Jupyter notebooks, which now document the code, to generate the data.)
  • A NRPy+-fied version of IllinoisGRMHD, with even better documentation is available here

Other Useful Links: Software Repositories, Telecons, & Minutes