Waiwera is a parallel, open-source geothermal flow simulator.

Waiwera features:

• numerical simulation of high-temperature subsurface flows, including robust phase changes
• parallel execution on shared- or distributed-memory computers and clusters
• use of PETSc (Portable Extensible Toolkit for Scientific Computation) for parallel data structures, linear and non-linear solvers, etc.
• standard file formats for input (JSON) and output (HDF5, YAML)
• structured, object-oriented code written in Fortran 2003
• free, open-source license (GNU LGPL)

Waiwera was developed at the University of Auckland's Geothermal Institute. Initial development was part of the "Geothermal Supermodels" research project, funded by the NZ Ministry of Business, Innovation and Employment (MBIE), with additional support from Contact Energy Ltd.

The word Waiwera comes from the Māori language and means "hot water".

Further information can be found on the Waiwera website and in the user guide.