کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
655186 | 1457636 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reynolds number effects in DNS of pipe flow and comparison with channels and boundary layers
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Reynolds number effects in DNS of pipe flow and comparison with channels and boundary layers Reynolds number effects in DNS of pipe flow and comparison with channels and boundary layers](/preview/png/655186.png)
چکیده انگلیسی
Direct numerical simulations of turbulent pipe flow were performed at four Reynolds numbers: ReÏ=180,500,1002and2003. Beyond ReÏ=1000 viscous scaling holds near the wall for the mean velocity, Reynolds shear stress and wall-normal velocity variance. Streamwise and spanwise velocity variances do not exhibit inner (viscous) scaling due to increasing large-scale energy contributions. A comparison with channel and boundary layer DNS data shows negligible statistical differences between pipes and channels, whereas the transverse velocities for pipes/channels are significantly different when compared with boundary layers. A further comparison displays that the boundary layer pressure fluctuations is greater than pipes/channels. In addition, is it shown that the higher pressure fluctuations in the boundary layer is not the sole mechanism responsible for a stronger wake region in the flow.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 45, February 2014, Pages 33-40
Journal: International Journal of Heat and Fluid Flow - Volume 45, February 2014, Pages 33-40
نویسندگان
C. Chin, J.P. Monty, A. Ooi,