Abstract
Experimental data on vortex formation near the sinkhole in a fluid flowing out of a reservoir are analyzed. An experimental facility which makes it possible to study the influence of various factors on vortex formation near a sinkhole has been designed and built. In the experiments performed, a vortex was observed only if before the sinkhole was opened a rotating disk was immersed in the fluid. In the steady-state flow regime, a brief rotation of the disk resulted in the formation and subsequent damping of a vortex. For a preswirled fluid, the formation of a vortex crater depends on the sinkhole location.
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