@article{HoelterLemkeWeinzierletal.2026, author = {Arne H{\"o}lter and Mathias Lemke and Stefan Weinzierl and Lewin Stein}, title = {A Tutorial on Non-Reflective Characteristic Boundary Conditions for Direct and Adjoint Time-Domain Acoustic Simulations}, journal = {Journal of Theoretical and Computational Acoustics}, year = {2026}, note = {revision under review} language = {en} }