Abstract
Concepts of a “solid body motion” and “fluid flow” are compared taking into account the condition of inobservability of a “fluid particle”. General properties of the fundamental set of fluid mechanics equations, accepted for describing fluid flows, are analyzed taking into account the compatibility condition. Hierarchy of periodic flows is classified basing on the order of linearized set of governing equations. Results of theoretical analysis of infinitesimal periodic flows in a stably stratified fluid including periodic internal waves and accompanied family of small scale components are given. Calculations of periodic internal waves propagation and generation in a fluid with arbitrary stable profile of buoyancy are compared with data of schlieren observations in laboratory. Fine flow structure observed behind uniformly towing strip is discussed in context of a given model. Some conclusions and recommendations on improvement techniques of a fluid dynamics experiment are presented.
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Acknowledgments
The work was partly financially supported by the Russian Academy of Sciences (Program OE13 “Vortices and waves in complex fluids”) and the Russian Foundation for Basic Research (grant 12-01-00128). Experiments were performed at setup USF “HPhC IPMech RAS” and supported by Ministry of Education and Science of Russian Federation.
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Chashechkin, Y.D. (2016). Differential Fluid Mechanics—Harmonization of Analytical, Numerical and Laboratory Models of Flows. In: Neittaanmäki, P., Repin, S., Tuovinen, T. (eds) Mathematical Modeling and Optimization of Complex Structures. Computational Methods in Applied Sciences, vol 40. Springer, Cham. https://doi.org/10.1007/978-3-319-23564-6_5
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