Neko v1.0.0

05 Dec 2025 - neko

This is a major release introducing several significant changes in terms of features and functionalities, user interaction, and code improvements.

Release Notes

Support for multiple (arbitrary number of) scalars.
Support for scalar statistics and averaging any registered field.
New matrix-free algebraic hp-multigrid preconditioner.
C API with bindings for Python and Julia.
Native global interpolation, supporting both CPU and GPU backends.
Support for Collective Communication libraries on accelerators (NCCL/RCCL), both for reductions and point to point communication during gather-scatter operations.
Support for injection of components. Currently supported: Source terms, Simulation components, LES models, and Wall Models.
Support for cyclic boundary conditions.
Simulation components:
- Support for differential operators gradient, curl and divergence.
- Full support for LES models on all backends.
Source terms:
- Application of a centrifugal force
- Support for application of a sponge source term based on a reference velocity field.

Registries, both scratch and global registry now supports vector and matrix types.
Gradient jump penalisation is put under the source term umbrella.
The elementwise_average approach to estimate the filter lengthscale in LES is changed from average length evenly shared by each GLL point to average GLL spacing.
Simulation components:
- vorticity is removed and replaced by the more general curl operator.
Source terms:
- user_pointwise is removed.
- user_vector is replaced by the user source term.

Full Changelog: https://github.com/ExtremeFLOW/neko/compare/v0.9.1…v1.0.0

A couple of features of Neko have been overhauled. This mean previous user files will need updates to support Neko v1.0

The case file structure has been updated.
The interface of user files have been updated.
Global registry of fields neko_field_registry have been renamed neko_registry.

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