Bart van Dijk worked on the SWMFsoftware/BATSRUS repository, focusing on enhancing the reliability of multi-ion flux calculations in the Physical Flux Module. He addressed a critical bug by reordering conditional statements to ensure that Lperp_ and LevelHP_ fluxes are correctly overwritten before the PUI scalar advection loop, which improved numerical stability and reduced the risk of incorrect flux handling. Bart applied his expertise in Fortran, numerical methods, and scientific computing, adhering to coding standards and providing clear documentation of the rationale and impact. His work contributed to more trustworthy engineering and physics simulations by improving the module’s numerical correctness.