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Hydrodynamics knots are not only promising elementary structures to studymass and momentum transfer in turbulent flows, but also potent analogs forother topological problems arising in particle physics. However, experimentalstudies of knots are highly challenging due to the limited control over knotgeneration and difficult observation of the resulting fast-paced multiscaleflow evolution. In this paper, we propose using acoustic streaming to tiehydrodynamic knots in fluids. The method is contactless, almost instantaneousand is relatively insensitive to viscosity. Importantly, it allows startingfrom quite arbitrary three dimensional flow structures without relying onexternal boundary conditions. We demonstrate our approach by using an acousticscrew dislocation to tie a knot in a sessile droplet. We observe an inversionof the knot chirality (measured by the hydrodynamic helicity) as thetopological charge of the screw dislocation is increased. Combined with recentprogress in acoustic field synthesis, this work opens a window to study morecomplex hydrodynamic knot topologies at a broader range of space andtimescales.

Contactless generation and trapping of hydrodynamic knots in sessile droplets by acoustic screw dislocations