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Changelog

StartUpDG.jl follows the interpretation of semantic versioning (semver) used in the Julia ecosystem. Recent changes will be documented in this file for human readability.

Changes when updating to v1.0.0

Most of the major changes are tracked in this PR. Some descriptions of other changes are listed below.

Added

  • Generation of cut-cell meshes using Subtriangulation quadrature by default, which ensures positive quadrature weights. The old behavior is retained by specifying a MomentFitting quadrature type.
  • Added subcell_limiting_operators, which constructs multi-dimensional versions of subcell operators used in Lin, Chan (2024). These subcell operators are constructed from sparse operators returned by sparse_low_order_SBP_operators(rd::RefElemData).

Changed

  • NamedArrayPartition was moved to RecursiveArrayTools.jl.
  • The required Julia version was increased to v1.10. This was to make StartUpDG.jl compatibility with RecursiveArrayTools.jl v3.4+ (see above).
  • Removed SimpleUnpack.jl as a dependency. Loading StartUpDG.jl will no longer reexport @unpack, since destructuring via (; propertyname) = x is supported natively in Julia 1.7 and up.
  • Updated to NodesAndModes v1.0+, which changed the ordering of triangle nodes to make them consistent with tet node ordering.
  • We introduced a MultidimensionalQuadrature type. All Polynomial approximation types now utilize either MultidimensionalQuadrature or TensorProductQuadrature as a type parameter. The previous type parameter DefaultPolynomialType is now simply used to determine the default quadrature type parameter. Note that this is internal behavior and should not impact standard usage of StartUpDG.jl.
  • Removed Requires.jl in favor of package extensions for Plots.jl and SummationByPartsOperators.jl dependencies.

Changes when updating to v0.17

Added

  • Added support for pyramid reference elements and meshes
  • Introduced unified read_Gmsh_2D(...) functions
  • Specializations of RefElemData for Polynomial(TensorProductQuadrature(quad_rule_1D)) approximation types
  • Add docs on difference between StartUpDG.jl and Nodal DG Matlab codes

Changed

  • removed approximationType as a property of RefElemData
  • Made Base.show output less verbose.
  • Deprecated CamlCase Gmsh read functions

Changes when updating to v0.16

Added

  • Add Polynomial{Gauss} type

Changed

  • add type parameter to Polynomial
  • Switch from LittleDict to MultipleRefElemData for hybrid meshes

Changes when updating to v0.15

Added

  • the NamedArrayPartition array type, which is similar to ComponentArrays but with the storage structure of ArrayPartition. This is used for the storage of MeshData fields in hybrid and cut-cell meshes, and can be used for the storage of solutions compatible with the OrdinaryDiffEq.jl framework.
  • added precomputed differentiation, face interpolation, mass, and lifting matrices for CutCellMesh types. These are specified using md = MeshData(...; precompute_operators=true), and are stored in md.mesh_type.cut_cell_operators.

Changed

  • The MeshData fields VXYZ and EToV have been moved into a VertexMappedMesh type. However, they can still be accessed as a property of MeshData (e.g., md.VX will still work).
  • Added a CurvedMesh type for MeshData constructed from modified nodal coordinates, e.g., using the constructor MeshData(rd, md, xyz...). CurvedMesh stores the original mesh type as a field. Previously, there was no way to distinguish a curved MeshData from a non-curved one.
  • Changes related to element types:
    • upstream change in NodesAndModes.jl: the abstract type AbstractElemShape is now parametrized by the dimension, e.g., Line <: AbstractElemShape{1}, Tri <: AbstractElemShape{2}.
    • the spatial dimension Dim parameter in MeshData is now inferred from the element type through elem <: AbstractElemShape{Dim}
    • the PhysicalFrame type now has leading type parameter PhysicalFrame{NDIMS} <: AbstractElemShape{NDIMS}
  • PhysicalFrame's fields are now restricted to be type SVector only (instead of Union{SVector, Tuple})

Removed

  • the Nplot field has been removed from RefElemData
  • all usages of ComponentArrays have been replaced by NamedArrayPartition
  • the deprecated MeshData(md::MeshData, rd::RefElemData, xyz...) constructor has been removed

Deprecated

  • the constructor for MeshData with all fields as well as VXYZ, EToV as arguments has been deprecated and will be removed in the next breaking release. This would only be used when extending MeshData. The standard MeshData constructor involving VXYZ, EToV, and rd::RefElemData is unchanged.
  • the constructor for RefElemData with all fields as well as Nplot has been deprecated and will be removed in the next breaking release. This is only used if extending RefElemData.