🌟 MFEM 4.6 Released

[tzanio]

Dear MFEM community,

Version 4.6 of MFEM was released on September 27, 2023. Some of the new additions in this release are:

• NURBS meshing and discretization improvements, including: support for free connectivity of NURBS patches, curve interpolation method for NURBS, and partial assembly on NURBS patches.

• SubMesh support for H(curl) and H(div) transfers demonstrated in the new Examples 34 and 35.

• TMOP enhancements for compound metrics 90, 94, 328, 338 and new mesh optimization miniapps for mesh quality, for interface and node-position fitting.

• New H(div) matrix-free saddle-point solver, suitable for high-order discretizations and GPU acceleration.

• Ultraweak DPG formulation for diffusion, convection-diffusion, acoustics and Maxwell. See the new miniapps/dpg directory.

• Stochastic PDE method for generating Gaussian random fields of Matern covariance. See the new miniapps/spde directory.

• New miniapp to map a parallel grid function to a different parallel partitioning of the same mesh.

• HIP support in the PETSc and SUNDIALS interfaces.

• Improved GPU code debugging by allowing breakpoints in the new mfem::forall functions (the MFEM_FORALL macro is preserved for backwards compatibility).

• 13 new examples and miniapps, including obstacle problem and topology optimization.

To download, and for more information visit https://mfem.org.

We welcome any and all feedback at https://github.com/mfem/mfem/issues.

--the MFEM team

cc: @mfem/everyone