Subsurface Flow Modeling Graphical tools for simulating nonisothermal multiphase flow and transport in fractured and porous media. PetraSim News Find out what’s new in PetraSim development. Review release notes and read the developers blog. Read More » Features in PetraSim PetraSim takes geological simulation to the next level in productivity. Quickly import CAD models and create high-quality animations from the results. Read More » Support Resources Learn helpful tips and tricks for putting together PetraSim models quickly. Find documentation and tutorial guides and videos. Read More »