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RELEASE.md

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Release v21.1

What is new?

  • Flexible GMRES
  • Constant flow rate
  • Time step controller for targetCFL
  • Improved runtime statistics
  • Support for ROCm version > v4.0
  • AVM for scalars
  • FEMSEM preconditioner
  • Update file (nekrs.upd) for runtime modifications
  • Validate key/value input in par
  • Various bug fixes

Good to know

  • [par] preconditioner = multigrid was replaced by preconditioner = multigrid+coarse
  • [par] Only valid key/value pairs will be accepted
  • [par] Default smootherType is ASM+Chebyshev+degree=2 (instead of degree=1)
  • [fld] Only first checkpoint will contain mesh coordinates
  • GMRES is now the default linear solver for pressure (higher memory usage)

Breaking Changes

  • [udf] Use std namespace qualifier e.g. std::cout instead of cout
  • [udf] Rename UDF_LoadKernels(nrs_t *nrs) => UDF_LoadKernels(occa::properties& kernelInfo)
  • [udf] Replace argument nrs_t *nrs by occa::properties& kernelInfo in udfBuildKernel(), (plugin)::buildKernel()
  • [udf] UDF_LoadKernels(occa::properties& kernelInfo) is no longer optional
  • Code crashes (Segmentation fault: invalid permissions) if MPI installation is not GPU aware unless you specify NEKRS_GPU_MPI=0 in $NEKRS_HOME/nekrs.conf

Known Bugs / Restrictions

Thanks to our Contributors

@RonRahaman, @aprilnovak, @yslan

We are grateful to all who added new features, filed issues or helped resolve them, asked and answered questions, and were part of inspiring discussions.

Hofix Release v21.0.1

  • Update to latest parRSB version
  • Fix restart issue if restart time is non-zero
  • Fix io-frequency issue
  • Fix JIT issue for lowMach
  • Disable gs-timers to prevent performance regression

Release v21.0

What is new?

  • ASM and RAS smoother + Chebyshev acceleration
  • Improved gs performance
  • Initial guess projection
  • Runtime averages
  • Stress formulation
  • ALE formulation to support moving meshes
  • Linear algebra helpers
  • Various bug fixes

What you may have to change to be compatible

  • common block SCRNS was replaced by pointer array NRSSCPTR (see ethier example)
  • boundary device functions and bc struct members in oudf were renamed
  • manually copying nek's IC in UDF_Setup() is no longer required
  • nrs->Nlocal was replaced by mesh->Nlocal
  • nrs->options was replaced by platform->options
  • nrs->linAlg was replaced by platform->linAlg
  • nek_copyFrom() was renamed to nek::copyToNek()
  • nek_copyTo() was renamed to nek::copyFromNek()
  • cds->fieldOffset was replaced by cds->fieldOffset[i]
  • nrs->mesh was replaced by nrs->meshV
  • cds->mesh was replaced by cds->mesh[i]
  • nrs->meshT was replaced by cds->mesh[0]
  • mesh->rank was replaced by platform->comm.mpiRank
  • mesh->comm was replaced by platform->comm.mpiComm
  • mesh->device was replaced by platform->device

Known Bugs

Thanks to our Contributors

@RonRahaman, @aprilnovak, @roystgnr, @yslan, @pwang234

We are grateful to all who added new features, filed issues or helped resolve them, asked and answered questions, and were part of inspiring discussions.

A special thanks goes to the CAPS Lab at ETHZ who helped to develop the moving mesh support.

Release v20.0

What is new?

  • Initial release

What you may have to change to be compatible

  • n/a

Known Bugs

80

Thanks to our Contributors

@AliKarakus, @thilinarmtb, @noelchalmers and @tcew for helping

We are grateful to all who added new features, filed issues or helped resolve them, asked and answered questions, and were part of inspiring discussions.