Internal waves are ubiquitous features in the ocean, atmosphere, and stratified lakes. These waves are sometimes visualized through bands of clouds in the atmosphere or rough streaks on the ocean or lake surface. They can be generated by the passage of a stratified fluid over a topographic feature such as a mountain or valley and can reach large enough amplitudes that they break, leading to mixing and energy dissipation. The currents associated with these waves can also interact with the bottom and contribute to transport of sediment, dust, and nutrients. In large-scale ocean and atmospheric modelling, these waves are not usually resolved but have an important enough effect on the large-scale dynamics that they must be parametrized. There is an active area of research investigating the best way to parametrize the effect of these waves, as well as other mixing processes that are not resolved in large-scale models. One technique is to investigate wave generation and breaking in idealized scenarios, with wave motion fully or partially resolved, in order to compare with solutions produced using state-of-the-art parametrizations.