NEKO v1.0.0

[njansson]

Release Notes

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

Breaking API changes

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.

Changelog

Major updates / features

• 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.

Minor changes / fixes

• 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: v0.9.1...v1.0.0

Known Issues

• Statistics simulation component crash during init for nvhpc: Statistics simulation component crash during init for nvhpc #1995
• CUDA 12.9 Drops support for NVTX v2: CUDA 12.9 Drops support for NVTX v2 #2012
• CPE GNU Fortran can not compile the C API: CPE GNU Fortran can not compile the C API #2104
• Linking fails when using CUDA 13: Linking fails when using CUDA 13 #2129
• No OpenCL implementation for cyclic boundary conditions: No OpenCL implementation for cyclic boundary conditions #2192
• SEGV when reading mesh data using CCE 19: SEGV when reading mesh data using CCE 19 #2209
• Global interpolation unit tests fails for OpenCL backend: Global interpolation unit tests fails for OpenCL backend #2210

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This discussion was created from the release NEKO v1.0.0.