Constrained transport and adaptive mesh refinement in the Black Hole Accretion Code Hector Olivares, Oliver Porth, Jordy Davelaar, Elias R. Most, Christian M. Fromm, Yosuke Mizuno, Ziri Younsi and Luciano Rezzolla A&A, 629 (2019) A61 Published online: 05 September 2019 DOI: 10.1051/0004-6361/201935559