Recent Updates

March 2026

• Reworked package scope around sparse linear-system workflows.
• Added explicit solver backend selection in solve!:
  • :direct using LU factorization and optional factorization reuse.
  • :linearsolve using LinearSolve.jl cache initialization and reuse.
• Added theta_step! orchestration with:
  • matrix assembly updates when dt changes,
  • RHS-only updates every step,
  • stored last_dt for reuse decisions.
• Added a generic, physics-agnostic block coupling layer:
  • OneWayCoupling for passive sequential coupling.
  • TwoWayCoupling for Picard outer iterations with optional under-relaxation.
  • Named-field transfer via CouplingMap and extension hooks.
• Added toy-only tests and docs examples for coupling orchestration.