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Changelog

All notable changes to FEAScript-core are documented in this file. The format is based on Keep a Changelog, and the project follows Semantic Versioning (while in 0.x, minor versions may contain breaking changes).

0.3.1 - 2026-10-30

Fixed

  • The FEAScript icon at the start of the README showed at full size on npmjs.com, which ignores the style attribute; it now has a fixed width and height

0.3.0 - 2026-10-30

Added

  • Triangular elements (linear and quadratic), including triangular meshes imported from Gmsh (#97)
  • Euler–Bernoulli beam model (eulerBernoulliBeamScript) with cubic Hermite elements and fixed, pinned, spring, force and moment conditions (#86)
  • Viscosity in the creeping flow model: coefficientFunctions: { viscosity }, a number or a function of (x, y) (#102)
  • Named result fields for models with several unknowns per node: solve() returns fields (velocityMagnitude, u, v, p for creeping flow; w, theta for the beam), and the plotting functions take a { field } option (#106)
  • Nonlinear 1D problems with the Newton–Raphson method in the general form PDE (#90)
  • Spatially varying coefficients: thermalConductivity and heatSource as functions of position (#92)
  • 1D front propagation
  • Frontal solver for every model that supports it, including the linear general form PDE (#100)
  • vtk.js visualization (plotSolutionVtk, plotInterpolatedSolutionVtk) and VTK/VTP export (#73, #79)
  • FEAScriptWorker takes the same model options as FEAScriptModel, so every model can run in a web worker (#107)
  • Gmsh import detects the mesh dimension and element order
  • Input validation for solvers and boundary conditions (#83)
  • Regression, analytical and benchmark tests (including NAFEMS T4), run with npm test on Node.js 18 and later
  • Node.js examples for the NAFEMS T4 benchmark, Couette flow and a cantilever beam

Changed

  • Sparse matrix format during assembly (#99)
  • BLAS routines from stdlib (#81)
  • Linear elements use a 2-point Gauss rule per direction (2 × 2 on quadrilaterals) instead of 1 point, so linear quadrilaterals no longer under-integrate the stiffness matrix; results on linear elements change slightly (#105)
  • Every solver returns the solution vector as a Float64Array
  • The CommonJS build is dist/feascript.cjs (was dist/feascript.cjs.js), so require("feascript") works (#112)
  • Source files are reorganized and lose the Script suffix (#80, #94)

Deprecated

  • The "constantTemp" boundary condition; use "constantTemperature"

Removed

  • setSolverConfig; use setModelConfig (#73)
  • importGmshQuadTri; use importGmshMesh (#80)
  • The private _creepingFlowMetadata and _eulerBernoulliBeamMetadata properties; use result.fields (#106)

Fixed

  • 1D convection and nonzero front values
  • Non-contiguous node tags in the Gmsh reader (#96)

0.2.0 - 2026-02-25

Added

  • Creeping (Stokes) flow model (creepingFlowScript) with Taylor–Hood elements (#63)
  • WebGPU Jacobi solver (#53)
  • Arbitrary geometries from Gmsh meshes (#58, #59)
  • Skewed structured 2D meshes (angleLeft, angleRight) (#60)
  • plotInterpolatedSolution

Changed

  • Solvers consolidated behind a single interface (#56)
  • setModelConfig replaces setSolverConfig, which is deprecated

0.1.3 - 2025-10-08

Added

  • General form PDE model (generalFormPDEScript) (#48)
  • Frontal solver (#40, #43)
  • 1D PDE solver (#42)
  • printVersion (#45)
  • Automated tests on pull requests (#44)

Changed

  • solidHeatTransferScript is renamed to heatConductionScript (#47)

Fixed

  • Signs of the advection and reaction terms in the general form PDE

0.1.2 - 2025-07-31

Added

  • Front propagation model (frontPropagationScript) for the eikonal equation (#29)
  • Solidification front example (#30)

0.1.1 - 2025-05-22

Added

  • First build published to npm (#25)

0.1.0 - 2025-05-15

  • Initial release: steady heat conduction in 1D and 2D (solidHeatTransferScript), structured meshes and Gmsh import, Jacobi and LU solvers, Plotly plotting, and a web worker (FEAScriptWorker)