کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
4992240 1368132 2018 10 صفحه PDF ندارد دانلود رایگان
عنوان انگلیسی مقاله
Vortex simulations of the Kelvin–Helmholtz instability with surface tension in density-stratified flows
کلمات کلیدی
Kelvin–Helmholtz instability; Vortex sheet; Surface tension; Density stratification;
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Vortex simulations of the Kelvin–Helmholtz instability with surface tension in density-stratified flows
چکیده انگلیسی

In this paper, we study long-time evolutions of the Kelvin–Helmholtz instability with surface tension and density jump by using the vortex sheet model. Applying a spectrally accurate numerical method, we investigate effects of surface tension and density jump on the instability in various regimes of parameters. The numerical results show that by varying the density ratio, the large-scale feature of the roll-up of the interface is basically similar, but the structure of the inner roll-up is significantly different. At high Weber numbers, the interface collides with itself at the finger tip for low Atwood numbers, but for high Atwood numbers, the finger is pinched off. The dispersive waves and corrugations on the interface are more prominent for low Atwood numbers. For a very high Weber number, the finger of the interface becomes small, while for a low Weber number, the interface has a structure of long filament. Results for initial multi-mode perturbations show the competition and merging of fingers as well as pinching and elongation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Mechanics - B/Fluids - Volume 67, January–February 2018, Pages 168-177
نویسندگان
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