Dam-Break Reflections in an Elongated Bose–Einstein Condensate

Bose–Einstein condensates (BECs) provide a highly tunable platform for exploring nonlinear hydrodynamic phenomena in quantum fluids. In this work, we investigate a quantum analogue of classical dam-break reflections in elongated BECs using a reconfigurable repulsive optical barrier. The resultant dynamics exhibit a rarefaction flow, a reflected shock-wave front, and a turbulent complex-wave region that forms between the barrier and the shock front. To better understand dissipation and effective viscosity within this region, we launch a secondary shock wave. In addition to this, we present an analog system for studying superfluid undular bore dynamics. These results open new avenues for controlled studies of shock-driven hydrodynamics in channel-geometry BECs.