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RELEASE.md

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Release v17.0-rc1

Major Features and Improvements

  • New paramater file .par (replacing .rea)
  • Added OIFS for moving mesh
  • Added Moving mesh for PN/PN
  • Improved stability for varying visosity and PN/PN
  • Added support for mixed Helmholtz/CVODE solves
  • New fast AMG setup tool based on HYPRE
  • New EXODUSII mesh converter
  • New interface to libxsmm (fast MATMUL library).
  • Extended lowMach solver for time varying thermodynamic pressure
  • Added DG for scalars
  • Added support for implicit none in .usr file
  • Reduced solver initilization time (parallel binary reader for re2, ma2 and AMG files)
  • Restart from arbitrary fld-file (multiple files not supported) using interpolation
  • Optional new user friendly SIZE file format (see SIZE.template)
  • Refactored NEKNEK
  • Added high-pass filter relaxation (alternative to explicit filter)
  • Refactored build system
  • Refactored residual projection including support for scalars and coupled Helmholtz solves

Backwards-Incompatible Changes

  • Replaced usr interpolation wrapper intpts() by intp() with a different interface
  • Replaced g2gi() by new generic fld reader gfldr()
  • Moved makenek from core to bin folder
  • Removed MOAB support
  • Replaced hpts.in/hpts.out by <casename>.his
  • Eliminated PPLIST symbol MPIIO as it is enabled by default now (only active if p65=1 or nfiler=1)
  • NENEK requires latest SIZE file format
  • Eliminated PPLIST symbol AMG_DUMP as we dump the files automatically if they don't exist
  • Eliminated PPLIST symbol AMG as it is a runtime parameter now (rea:p40 or par:preconditoner=semg_amg in PRESSURE section)
  • Changed various key/values for .par
  • Changed meaning of param(26) to be the targetCFL instead of OIFS substeps

Known Bugs

65

Thanks to our Contributors

This release contains contributions from the Nek5000 core developers, as well as:

@ggiannako, @nicooff, @kmittal2, @RonRahaman, @cliosaglietti, @EvelynOtero, @mattiabr, @maxhutch, @hackljf, @negips, @kentO, @nchristensen, @spatel7286

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