The geometry of a downstream obstacle is one of the major parameters affecting the stability range of circular hydraulic jumps and, yet, it has not been adequately addressed by researchers. The present study investigates the effects of the downstream obstacle geometry and the parameters like the flow rate, the jet diameter, and the downstream obstacle height on the stability range of circular hydraulic jumps. Its findings indicate that an increase in the fluid jet diameter leads to the narrowing of the stability range of circular jumps. In addition, an increase in the downstream obstacle height produces a reduction of the hydraulic jump radius and its stability range. The results also show that in the presence of a square downstream obstacle the stability range of circular jumps is less than that in the case of a triangular downstream obstacle and greater than in the case of a circular downstream obstacle.

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