Results of 2D wave propagation in a dissipative medium with a sound-hard scatterer at three selected time instances. In (b), the result for an extended domain is shown with an indication of the original size of the disc to verify the NRBC. (a) Acoustic pressure fields at t = 7.5 μs (left) and t = 13.5 μs (right); (b) Acoustic pressure fields at t = 36 μs for the original (left) and extended domain (right).