Overview

The main C++ components are:

• ElasticityProblem in include/elasticity.h for bulk elasticity with optional transient integration and immersed coupling.

• PoissonProblem in include/laplacian.h for scalar immersed Poisson/Laplacian problems.

• ReducedPoisson, ReducedCoupling, and TensorProductSpace in include/reduced_poisson.h, include/reduced_coupling.h, and include/tensor_product_space.h for reduced-order coupling workflows.

• Inclusions in include/inclusions.h for immersed geometry, quadrature data, and reduced basis metadata.

• ReferenceCrossSection in include/reference_cross_section.h for reference reduced-basis and quadrature construction.

• ParticleCoupling in include/particle_coupling.h for particle insertion and distributed ownership mapping.

The mathematical and algorithmic background of the repository is described in [Heltai and Zunino, 2023].

The repository also contains benchmark inputs, exploratory notebooks, and coupled 3D/1D assets used by specialized workflows.