NEKO v1.0.1

Release Notes

This is a minor bugfix release addressing various issues and regressions identified in v1.0.

Changelog

Resolved Issues

• GNU Fortran can not compile the C API (#2104, #2247)
• Regression in pyneko interfaces (#2248)
• Segmentation fault in wall_model BC (#2238)
• Bug in HDF5 reader/writer
• Kernel launch failures for ranks without cyclic boundaries
• OpenCL memory leaks
• Various memory leaks

Full Changelog: v1.0.0...v1.0.1

Known Issues

• Statistics simulation component crash during init for nvhpc: #1995
• CUDA 12.9 Drops support for NVTX v2: #2012
• Linking fails when using CUDA 13: #2129
• No OpenCL implementation for cyclic boundary conditions: #2192
• SEGV when reading mesh data using CCE 19: #2209
• Global interpolation unit tests fails for OpenCL backend: #2210

NEKO v1.0.0

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

NEKO v1.0.0-rc3

This is the third release candidate for v1.0.0

Full Changelog: v0.9.1...v1.0.0-rc3

NEKO v0.9.1

Release Notes

This is a minor bug fix release addressing issues in dofmap numbering when a compiler that does not follow a so-called "byte" scheme for numbering kinds is used.

Known Issues

• Problems with recent Cray Fortran compilers: #200

Full Changelog: v0.8.0...v0.9.1

NEKO v0.9.0

Release Notes

This is a major release, adding several new features and fixes several bugs and portability issues, including:

• Stress formulation
• Zone initial condition
• Field initial condition
• Support for HDF5
• OIFS time scheme
• LES models, currently limited to CPU and SX backends
• Gradient jump penalty
• Revamped fluid statistics providing several new features
• More simulation components:
  • Computation of the derivative of a field
  • Computation of forces and torque on a surface
  • Computation of the weak gradient of a field
  • Computation of the spectral error indicator
  • User defined components
  • Fluid statistics
• Refactored source tree, change to submodules
• Reworked build system, now support building a shared/dynamic libneko

Known Issues

• Problems with recent Cray Fortran compilers: #200
• Problems with NVIDIA Fortran after the switch to submodules: #1447

Full Changelog: v0.8.0...v0.9.0

NEKO v0.8.1

Release Notes

This is a minor bug fix release, addressing issues in CSV file reader/writer and boundary conditions symmetry and non_normal.

Known Issues

• Problems with recent Cray Fortran compilers: #200
• OpenCL backend limited to a single queue (stream): #1056

Full Changelog: v0.8.0...v0.8.1

NEKO v0.8.0

Release Notes

This is a major release, adding several new features and fixes several bugs and portability issues, including:

• Immersed boundary based on Brinkmann forcing (#1142)
• User defined Dirichlet boundary conditions (#985)
• Variable time-stepping (#1148)

Known Issues

• Problems with recent Cray Fortran compilers: #200
• OpenCL backend limited to a single queue (stream): #1056

Full Changelog: v0.7.0...v0.8.0

NEKO v0.8.0-rc2

Release Notes

This is the second release candidate for v0.8.0

Full Changelog: v0.7.2...v0.8.0-rc2

NEKO v0.8.0-rc1

Release Notes

This is the first release candidate for v0.8.0

Full Changelog: v0.7.2...v0.8.0-rc1

NEKO v0.7.2

Release Notes

This is a minor bug fix release, addressing issues in the distribution scripts for including examples and patches

Known Issues

• Problems with recent Cray Fortran compilers: #200
• OpenCL backend limited to a single queue (stream): #1056