Abstract
It is proved that in any vortex flow of a liquid or a gas the vorticity evolution can be considered as the displacement of vortex tubes at a certain velocity U which generally is not the same as the fluid velocity. For a viscous incompressible fluid a technique of calculating U from the fluid velocity field is proposed.
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Original Russian Text © V.V. Markov, G.B. Sizykh, 2015, published in Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, 2015, Vol. 50, No. 2, pp. 8–15.
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Markov, V.V., Sizykh, G.B. Vorticity evolution in liquids and gases. Fluid Dyn 50, 186–192 (2015). https://doi.org/10.1134/S0015462815020027
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DOI: https://doi.org/10.1134/S0015462815020027