P.V.Lukianov Interaction of qausihorizontal vortex and subsurface drift current caused by steady wind effect |
Applied hydromechanics, Vol. 13 (85) ¹ 1, (2011) |
| Interaction qusihorizontal vortex and subsurface drift current caused by steady wind effect 44 In this paper, the interaction of quasihorizontal vortex and subsurface Ekman drift flow caused by steady wind effect has been investigated. Reynolds averaged Navier-Stokes equations (RANS) with Boussinesq approximation for density field are used. The model of the problem is non-hydrostatic. Horizontal diffusion is approximated according to Smagorinsky model, and vertical one - by Prandtl-Obuhov model. At initial time moment the vortex is set under drift flow layer close to it or at lower part of the flow. Owing to vertical diffusion, when the time pass vortex become interact with drift flow. Obtained results agree with common sense: vortex bends in vertical cross-section plane and the domain of vortex-drift flow interaction moves along (shifts by) drift flow. The interaction may be classified as weak one and strong one. When weak interaction, vortex just shifted by drift flow and weakly deformed at each horizon. When strong interaction, the vortex horizontal structure does not resemble it's initial one. |
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KEY WORDS: quasihorizontal vortex, turbulent diffusion, subsurface drift flow |
| TEXT LANGUAGE: Russian |