New Features and Enhancements
Updated the MRIStep module in ARKODE to support extended Super Time Stepping (ExtSTS) methods for multi-physics simulations involving parabolic components, through the MRIStepExtSTSCreate function. See the documentation section on the mathematical methods in MRIStep for more details on the structure of ExtSTS methods, and the documentation section on a skeleton of usage for MRIStep for details on its usage.
Added Butcher tables for the classical RK4 (ARKODE_KUTTA_RK4a_4_4) and 3/8-rule (ARKODE_KUTTA_RK4b_4_4) methods.
Added CUDA support to the sundials4py Python interface. CUDA N_Vectors can be used with CUDA device arrays from CuPy, PyTorch and JAX when built with SUNDIALS_ENABLE_CUDA set to ON.
The KLU SUNLinearSolver is now available in sundials4py.
sundials4py now has a N_VGetNumpyArray function which should be used instead of N_VGetArrayPointer.
The SUNLinearSolver interface to SuperLU_DIST now supports single precision.
Added the function N_VSetDeviceArrayPointer to the N_Vector API to set the device data pointer for vector implementations with a device memory space.
Added the SUNDIALS_ENABLE_DEPRECATED_WARNINGS CMake option to allow users to disable compiler warnings emitted by deprecated SUNDIALS API annotations.
Bug Fixes
Fixed a bug where the factor provided by ARKodeSetEpsLin was scaled by 0.1. To restore the original behavior, call ARKodeSetEpsLin with an argument of 0.005.
Fixed bug in SUNNonlinearSolver_Auto which resulted in premature switch to Newton from fixed point due to convergence rate check occurring after only one iteration.
Fixed duplicate keys in IDA and IDAS logging output from consistent initial condition solves and order selection diagnostics.
Deprecation Notices
Renamed the ARKODE_ARK2_ERK_3_1_2, ARKODE_ARK2_DIRK_3_1_2, ARKODE_ASCHER_ERK_3_1_2, and ARKODE_ASCHER_SDIRK_3_1_2 Butcher tables to ARKODE_GKC21_ERK_3_1_2, ARKODE_GKC21_DIRK_3_1_2, ARKODE_ARS222_ERK_3_1_2, and ARKODE_ARS222_SDIRK_3_1_2, respectively, to reflect the original inventors
of each method. The previous table names are deprecated and will be removed in a future release.
Renamed the ARKODE_IMEX_MRI_GARK_ARK2 and ARKODE_IMEX_MRI_GARK_ASCHER_ARK2 multirate coupling tables to ARKODE_IMEX_MRI_GARK_GKC21 and ARKODE_IMEX_MRI_GARK_ARS222 to reflect the original inventors of the base Runge--Kutta tables on which these are based. The previous table names are deprecated and will be removed in a future release.