libCEED: Efficient Extensible Discretization

Interface changes

• Added CeedOperatorSetName for more readable CeedOperatorView output.
• Added CeedBasisCreateProjection to facilitate interpolation between nodes for separate CeedBases.
• Rename and move CeedCompositeOperatorGetNumSubandCeedCompositeOperatorGetSubList` to public interface.

New features

• Update /cpu/self/memcheck/* backends to help verify CeedQFunctionContext data sizes provided by user.
• Improved support for $H(\text{div})$ bases.
• Added CeedInt_FMT to support potential future use of larger interger sizes.
• Added CEED_QFUNCTION_ATTR for setting compiler attributes/pragmas to CEED_QFUNCTION_HELPER and CEED_QFUNCTION.
• OCCA backend updated to latest OCCA release; DPC++ and OMP OCCA modes enabled. Due to a limitation of the OCCA parser, typedefs are required to use pointers to arrays in QFunctions with the OCCA backend. This issue will be fixed in a future OCCA release.

Bugfix

• Fix bug in setting device id for GPU backends.
• Fix storing of indices for CeedElemRestriction on the host with GPU backends.
• Fix CeedElemRestriction sizing for CeedOperatorAssemblePointBlockDiagonal.
• Fix bugs in CPU implementation of CeedOperatorLinearAssemble when there are different number of active input modes and active output modes.

Examples Compressible Navier-Stokes mini-app

• Various performance enhancements, analytic matrix-free and assembled Jacobian, and PETSc solver configurations for GPUs.
• Refactored to improve code reuse and modularity.
• Support for primitive variables for more accurate boundary layers and all-speed flow.
• Added $YZ\beta$ shock capturing scheme and Shock Tube example.
• Added Channel example, with comparison to analytic solutions.
• Added Flat Plate with boundary layer mesh and compressible Blasius inflow condition based on Chebyshev collocation solution of the Blasius equations.
• Added strong and weak synthetic turbulence generation (STG) inflow boundary conditions.
• Added "freestream" boundary conditions based on HLLC Riemann solver.
• Automated stabilization coefficients for different basis degree.

PETSc Bake-off problems

• Support for convergence studies.

Maintainability

• Refactored /gpu/cuda/shared and /gpu/cuda/gen as well as /gpu/hip/shared and /gpu/hip/gen backend to improve maintainablity and reduce duplicated code.
• Enabled support for p > 8 for /gpu/*/shared backends.
• Switch to clang-format over astyle for automatic formatting; Makefile command changed to make format from make style.
• Improved test harness.