Shock wave/boundary layer interaction in hydraulic jumps in very large channels

It can be seen in literature that the fundamental factors governing oblique shock wave development, typically in very large channels with straight sidewalls, have not yet been completely understood and remain at the level of indicating its presence and formation. In this study, some aspects of boundary layer development and its detachment from the channel lateral sidewall are investigated. At the detachment point of the lateral shock waves, it was noted that the displacement thickness experiences a significant increase; this is accompanied by a significantly reduced gradient normal to the channel side-walls of the flow velocity as well as the occurrence of a strong, sudden adverse pressure gradient. Furthermore, it is argued that the supersonic flow separation analogy with a supercritical free surface flow can be applied to this case study and that the behavior of the supercritical flow during separation can be interpreted by the free interaction theory.