کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1725133 | 1520674 | 2016 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Three-dimensional flow structure of a non-buoyant jet in a wave-current coexisting environment
ترجمه فارسی عنوان
ساختار جریان سه بعدی یک جت ناپیوسته در یک محیط همجوشی جریان موج
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کلمات کلیدی
آزمایشات آزمایشگاهی، شبیه سازی گردابی بزرگ، ابرهای فاضلاب، هواپیمای بدون سرنشین، محیط فعلی همگام موج،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی دریا (اقیانوس)
چکیده انگلیسی
The three-dimensional flow structure of a non-buoyant vertical round jet in a wave-current coexisting environment is investigated. Laboratory experiments are first conducted to measure instantaneous flow patterns and mean velocity fields of the jet in a wave-current coexisting environment and a current-only environment for comparison. The distinctive 'effluent clouds' phenomenon is clearly observed in the wave-current coexisting environment but scarcely observed in the current-only environment. Moreover, the mean velocity vectors bend further toward the bottom when the wave effect is present. To reveal a more detailed flow structure of the jet in the wave-current coexisting environment, a large eddy simulation (LES) model is developed and validated against the experimental data. The mechanisms of formation and development of 'effluent clouds' are unravelled based on in-depth analysis of the vorticity contours and the high-pass filtered flow fields on the vertical symmetrical plane. With the variation of instantaneous jet-to-current velocity ratio, the 'effluent clouds' dynamically interact with the current-induced counter-rotating vortex pair (CVP), resulting in an inverted pear-shaped distribution of mean flow field above the CVP structure centre. This study highlights that the existence of 'effluent clouds' can lead to a significant enhancement of jet spread and dilution in the wave-current coexisting environment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean Engineering - Volume 116, 1 April 2016, Pages 42-54
Journal: Ocean Engineering - Volume 116, 1 April 2016, Pages 42-54
نویسندگان
Zhenshan Xu, Yongping Chen, Jianfeng Tao, Yi Pan, Derrick M.A. Sowa, Chi-wai Li,