HISTORY

= 2026-07-11 (1.1.1)
* Fix bugs
  * Fix bugs introduced in new variable container framework.

= 2026-07-06 (1.1.0)

* New features
  * Begin introducing OpenACC/GPU support in FElib and sample programs, including device-data management and NVIDIA-oriented build and run configurations.
  * Add multigrid-method modules in the DG framework and sample programs for 2D and 3D Poisson problems.  
  * Add an atmospheric-variable container framework that enables physics components to use atmospheric states that may differ from those used by the DG dynamical core.
  * Add preprocessing and smoothing options for atmospheric variables used in physics processes, including modal and quasi-global filtering strategies.
  * Add a gray radiation scheme with optical-depth calculations, a radiation driver interface, history output, and a test case.
  * Add a library implementation of the large-scale condensation scheme and make it available as a selectable cloud microphysics scheme.
  * Add a none-dynamics option for process-level and idealized physics experiments.
  * Add driver and variable-manager modules for radiation, cumulus parameterization, and PBL turbulence parameterization components.
* Improvements
  * Enhance the spectral analysis program and add detailed documentation, including options for controlling full-data output.
  * Improve documentation for advanced SCALE-DG configurations, including physical processes, tracer transport, modal filtering of dynamical and tracer variables, and the shallow-atmosphere approximation.
  * Update sample programs for advection problems to support GPU execution and improved numerical-error analysis.
* Fix bugs
  * Fix spelling errors in module and public function names.

= 2025-10-03 (1.0.0)

* New features
  * Support Tomita08 as a cloud microphysics scheme provided by the SCALE library.
  * Hide MPI communication wait time by overlapping communication with element-wise computations in the regional HEVE solver.
  * Add a module and sample program for the Smoothness-Increasing Accuracy-Increasing (SIAC) filter.
  * Add a tool for spectral analysis using DG data on 3D regional meshes.
  * Add model-description and user-guide documents for SCALE-DG (experimental).
* Improvements
  * Update configuration files for sample programs and atmospheric-model test cases.
  * Improve the computational performance of the vertical implicit solver in the DG HEVI scheme.
  * Speed up tracer-advection calculations.
  * Improve the computational performance of the module for managing temporal integration with RK schemes.
  * Modify the build system to reduce compilation time for individual atmospheric-model test cases.
  * Ensure reproducible results when random numbers are used with a fixed seed for initial conditions in test cases.
* Fix bugs
  * Fix a bug in tracer-variable initialization when ATMOS_HYDROMETOR_dry=T and QA > 0.
  * Fix a bug in post-processing when MPI_wait is called at arbitrary timing in 2D and 3D global-model modes.

= 2025-04-01 (0.9.0)

* New features
  * Add a module for DNS in turbulence schemes.
  * Add a surface-flux scheme with constant bulk coefficients for heat and moisture.
  * Enable no-slip and fixed-value thermal boundary conditions for viscous and diffusion terms.
  * Add a moist version of the Held–Suarez test case based on Thatcher and Jablonowski (2016).
  * Add a Rayleigh–Bénard convection test case.
  * Speed up several HEVE solvers and modal filtering when using tensor-product hexahedral elements.
  * Provide an option for persistent communication in halo-data exchange.
  * Support HEVI without mass-matrix lumping.
  * Support recent Intel Fortran compilers based on LLVM.
  * Add error evaluation to sample programs for linear advection tests.
  * Provide reference manuals generated by Doxygen on the web page.
* Improvements
  * Alleviate the effects of roundoff errors in the differential matrix.
  * Modify the strategy for specifying surface boundary conditions in the presence of topography.
  * Speed up MPI communication modules by removing temporary objects.
  * Reduce initialization time for high-order elements, e.g., p >= 11, on A64FX.
  * Consider vertical coordinate transformation when constructing a discrete hydrostatic-balance state.
  * Fix the experimental setup of a dynamical-core benchmark test for a tidally locked Earth atmosphere.
* Fix bugs
  * Modify the numerical flux for global tracer advection.
  * Fix a bug related to the flag controlling whether restart files are output.

= 2024-05-01 (0.8.0)

* New features
  * Support general curvilinear coordinates in the Smagorinsky–Lilly turbulence model.
  * Support HEVE, GLOBALNONHYDRO3D_RHOT_HEVE, without the shallow-atmosphere approximation.
  * Enable input of a topography data file when generating initial data.
  * Add a user interface for setting tendencies before update subroutines in components.
  * Enable specification of a postfix when building library and binary files.
* Improvements
  * Improve the numerical stability of the HEVI scheme over steep topography.
  * Improve numerical stability by changing the strategy for applying the modal filter in the HEVI scheme.
  * Add global attributes with time information to output files from regrid_tool.
  * Enable specification of the vertical-coordinate variable name in regrid_tool.
* Fix bugs
  * Fix 2D data regridding when the numbers of MPI processes differ between input and output data.
  * Fix the method for determining the nearest adjacent node in the MeshUtil3D_BuildInteriorMap subroutine.
  * Fix a bug in index mapping across patch boundaries when using a vertical axis with positive downward direction.
  * Fix eigenvalues for numerical diffusion in tracer advection when coordinate transformation is considered.
  * Fix a bug in procedure overriding of the update subroutine in mod_user.F90.

= 2023-02-16 (0.7.0)

* New features
  * Add a module for evaluating numerical errors.
  * Enhance utility subroutines for generating initial data.
    * Enhance a subroutine that provides a cosine-bell profile.
    * Add a subroutine for preparing initial data using Galerkin projection.
  * Support the energy monitor on cubed-sphere meshes in the atmospheric model.
  * Update the sample program for the 1D advection test.
    * Enable numerical-error evaluation and visualization of results.
  * Add fluid solvers using total energy conservation as the energy equation (experimental).
  * Add test suites for the 3D regional atmospheric model.
    * Isentropic vortex.
    * Kelvin–Helmholtz wave.
    * Mountain wave: linear nonhydrostatic case (Giraldo and Restelli, 2008) and Schär-type mountain case (Schär et al., 2002).
* Improvements
  * Modify mass and heat conservation in the tracer negative fixer.
  * Enable specification of surface pressure when the initial hydrostatic state is generated.
  * Avoid matrix singularity when generating the initial hydrostatic state.
  * Modify interfaces for user-defined modules.
  * Refactor the source code of the dynamical core.
  * Set coefficients in Shu–Osher form when the forward Euler scheme is used.
  * Create a Makefile to build all source files from the top-level directory.
* Fix bugs
  * Set density values before the tracer-advection process in tracer-advection tests.
  * Fix a bug in a precipitation scheme.
  * Fix a bug in array allocation for storing topology information of the 3D cubed-sphere mesh.
  * Remove an extra call to IO_setup.

= 2022-05-17 (0.6.0)

* New features
  * Add a tracer-advection scheme with a limiter to preserve non-negativity.
  * Support eddy diffusion of tracer variables.
  * Support the Kessler scheme as a cloud microphysics scheme in the regional DG model.
  * Add test suites for the 3D regional atmospheric model.
      * Tracer advection and rising warm bubble with moist processes.
  * Add test suites for the 3D global atmospheric model.
      * Tracer advection and a dynamical-core test for a tidally locked Earth atmosphere.
  * Support conversion of wind components in regrid_tool.
* Improvements
  * Improve the computational performance of the HEVI scheme.
  * Modify Held–Suarez forcing.
* Fix bugs
  * Fix a bug in defining axis information for 1D output data.
  * Fix a subroutine for converting a Shu–Osher matrix to a Butcher matrix.
  * Fix a bug in regridding data on a 3D structured grid.

= 2021-09-12 (0.5.0)

* New features
  * Add modules for handling 3D cubed-sphere meshes.
  * Add simplified sample programs using the library.
      * 3D linear advection equation on a 3D cubed-sphere mesh.
      * Eigenvalue analysis of the 1D linear advection problem with DGM.
  * Implement a global shallow-water model on a 2D cubed-sphere mesh.
  * Implement a global nonhydrostatic fully compressible atmospheric model on a 3D cubed-sphere mesh.
      * Support both HEVE and HEVI.
  * Treat topography in regional and global atmospheric models using terrain-following coordinates.
  * Add test suites for the global shallow-water model.
      * Test cases of Williamson et al. (1992), barotropic instability (Galewsky et al., 2004), and cross-polar flow (Donald and Bates, 1989).
  * Add test suites for the 3D global atmospheric model.
      * Test cases of sound wave, inertia–gravity wave, baroclinic wave, mountain wave, equatorial wave described in Tomita et al. (2004), and the Held–Suarez test.
  * Implement a new regrid_tool by unifying INTERP and cs2lonlat.
  * Support history_in and improve output of axis information.
* Fix bugs
  * Fix a bug in the default time interval for restart-data output.

= 2021-05-06 (0.4.0)

* New features
  * Enhance the 3D nonhydrostatic atmospheric model.
    * Support sub-grid-scale turbulence processes for LES.
  * Add test cases for the 3D nonhydrostatic atmospheric model.
    * PBL turbulence.
    * Rising thermal bubble.
  * Add modules for handling 2D cubed-sphere meshes (experimental).
  * Add simplified sample programs using the library.
    * 2D linear advection equation on a 2D cubed-sphere mesh (experimental).
  * Add a regrid tool to convert data on a 2D cubed-sphere mesh to longitude–latitude mesh data (experimental).
* Fix bugs
  * Fix a bug in the sponge-layer code in the dynamical process.

= 2021-01-07 (0.3.0)

* New features
  * Add Runge–Kutta schemes.
    * Explicit SSP RK schemes with higher-order accuracy and wider stability regions.
    * IMEX schemes with higher-order accuracy.
  * Add simplified sample programs using the library.
    * 1D linear advection–diffusion equation.
    * 3D Euler equation with the HEVI temporal scheme.
  * Enhance the 3D nonhydrostatic atmospheric model.
    * Support the HEVI method in the dynamical process.
    * Support the sponge layer in the dynamical process.
    * Support finite-element sizes that vary in the vertical direction.
    * Add a component for providing surface fluxes.
    * Add a component for representing sub-grid-scale turbulence processes (experimental).
    * Support different time steps among components.
    * Add a function for monitoring global mean values.
  * Add INTERP, a tool for interpolating output data from the DG atmospheric model.
  * Support execution on Fugaku and improve computational performance.
* Fix bugs

= 2020-10-02 (0.2.0)

* New features
  * Add a library for solving PDEs in regular 3D domains with the nodal discontinuous Galerkin method (nodal DGM).
  * Add sample programs for 3D linear advection problems using the library.
  * Implement a 3D nonhydrostatic atmospheric model with nodal DGM using the library.
    * Add four dynamical-core test cases: sound wave, inertia–gravity wave, density current, and baroclinic wave.
* Fix bugs

= 2019-10-20 (0.1.0)

* New features
  * Add a library for solving PDEs in 1D and regular 2D domains with the nodal discontinuous Galerkin method (nodal DGM).
  * Add sample programs for 1D and 2D linear advection problems using the library.
  * Implement a 2D nonhydrostatic atmospheric model with nodal DGM using the library.
    * Add two dynamical-core test cases: gravity wave and density current.