Hydrodynamics of natural oscillations of neutrally buoyant bodies in a layer of continuously stratified fluid
The flow patterns induced by floats of different shapes (sphere, short and long cylinders) freely sinking to the neutral-buoyancy horizon in a continuously stratified fluid are investigated using optical methods. General flow elements, both large-scale (waves, vortices, hydrodynamic wake) and fine-scale (boundary layers, extended autocumulative jets), are distinguished. For large times, the float oscillation frequencies are of the order of or greater than the buoyancy frequency of the medium. This indicates the significant effect of the induced flows on the motion of the float.
Keywordsstratified medium internal waves autocumulative jets vortices wake
Unable to display preview. Download preview PDF.
- 1.J. N. Newman Marine Hydrodynamics, MIT Press, Cambridge, Mass. (1977).Google Scholar
- 2.Yu.V. Pyl’nev and Yu. V. Razumeenko, “Investigation of damped oscillations of a deeply immersed float of specific shape in uniform and stratified fluid,” Izv. Akad. Nauk USSR, Mekh. Tverd. Tela, No. 4, 71–79 (1991).Google Scholar
- 3.Project “Argo”http://www.argo.ucsd.edu/.
- 4.L. N. Sretenskii, Theory of Wave Motions in a Fluid [in Russian], Nauka, Moscow (977).Google Scholar
- 5.L. D. Akulenko and S. V. Nesterov, “Oscillations of a rigid body on the interface of two fluids, ” Izv. Akad. Nauk USSR, Mekh. Tverd. Tela, No. 5, 34–40 (1987).Google Scholar
- 6.L. M. Brekhovskikh and V. V. Goncharov, Introduction to Continuum Mechanics [in Russian], Nauka, Moscow (1982).Google Scholar
- 7.L. H. Larsen, “Oscillations of a neutrally buoyant sphere in a stratified fluid,” Deep Sea Res., 16, No. 6, 587–603 (1969).Google Scholar
- 8.J. Cairns, W. Munk, C. Winant, “On the dynamics of neutrally buoyant capsules in experimental drop in Lake Tahoe,” Deep Sea Res., 26A, 369–381 (1979).Google Scholar
- 9.Yu. D. Chashechkin and V. V. Levitskii, “Hydrodynamics of natural oscillations of a sphere on the neutral-buoyancy horizon in a continuously stratified fluid,” Dokl. Akad. Nauk, 364, No. 1, 52–56 (1999).Google Scholar
- 10.V. V. Levitskii and Yu. D. Chashechkin, “Natural oscillations of a neutrally buoyant body in a continuously stratified fluid,” Fluid Dynamics, 34, No. 5, 641–651 (1999).Google Scholar
- 11.Yu. D. Chashechkin and V. V. Levitskiy, “Pattern of flow around a sphere oscillating on a neutral-buoyancy horizon in a continuously stratified fluid,” J. Visualization, 6, No. 1, 59–65 (2003).Google Scholar
- 12.V. G. Baidulov, P. V. Matyushin, and Yu. D. Chashechkin, “Flow pattern induced by diffusion near a sphere in a continuously stratified fluid,” Dokl. Akad. Nauk, 401, No. 5, 613–618 (2005).Google Scholar
- 13.Yu. D. Chashechkin and A. V. Kistovich, “Classification of three-dimensional periodic flows in a fluid,” Dokl. Akad. Nauk., 395, No. 1, 55–58 (2004).Google Scholar
- 14.S. A. Smirnov, Yu. D. Chashechkin, and Yu. S. Il’inykh, “High-accuracy method of measuring the buoyancy period profile,” Izmer. Tekhn., No. 6, 15–18 (1998).Google Scholar
- 15.Yu. A. Trishin, Physics of Cumulative Processes [in Russian], Lavrent’ev Inst. Hydrodyn. SO RAS, Novosibirsk (2005).Google Scholar
- 17.G. R. Grek, M. M. Katasonov, V. V. Kozlov, and V. G. Chernorai, “Peculiarities of the internal structure of “banded patterns”,” Teplofiz. Aeromekh., 7, No. 1, 10–21 (2000).Google Scholar
- 20.Yu. D. Chashechkin and Yu. V. Prikhod’ko, “Pattern of flows formed by a freely oscillating cylinder on neutralbuoyancy horizons in a continuously stratified fluid,” Dokl. Akad. Nauk, 407, No. 5 (2006).Google Scholar