Dynamics of a turbulent rotating jet emerging from a vortex well to the flow surface

by

A.E. Shchodro1, A.N. Sorokin2, Yu.E. Shishkin1, 2

1Institute of Natural and Technical Systems, RF, Sevastopol, Gogol St., 14

2Sevastopol State University, RF, Sevastopol, Universitetskaya St., 33

 E-mail: ashodro@ya.ru

DOI: 10.33075/2220-5861-2025-3-39-49

UDC 532.54                             

EDN: https://elibrary.ru/jnjala

Abstract:

The dynamics of sediment uplift and dispersion were evaluated in a special device generating a vortex flow with a vertical axis, designed to capture sediments transported by wave action. Models of the previously patented design were created and tested under laboratory and field conditions. The experiments monitored sediment uplift from the seabed and their transport toward the shore, addressing the tasks of shoreline protection, beach restoration, and coastal defense. Several structural elements of the “vortex well” were optimized to improve sediment capture efficiency. On a wave-exposed coastal slope, breakwater models at scales of 1:30 and 1:10 were installed. The discharge of bottom sediments lifted by the helical flow and dispersed over the seabed area behind the well was determined. It was shown that nearly all sediments naturally raised by waves are further entrained into the upper flow layers and then either redistributed across the seabed or carried away by longshore currents. Approaches to theoretical calculation of the vortex jet trajectory in a drift flow were outlined. A literature review was conducted, and the OpenFOAM software with a hydrodynamic module was employed. The feasibility of beach restoration through the construction of a chain of artificial islands followed by backfilling of the spaces between them and the shore is demonstrated. This approach is especially relevant for coasts subject to constant erosion, such as the western coast of Crimea and many other marine shorelines of Russia.

Keywords: vortex well, bottom sediments, wave action, offshore current, beach protection, beach restoration, bottom sediment flow, model laboratory and field tests

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