کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7053577 | 1457611 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reprint of: Influence of corner geometry on the secondary flow in turbulent square ducts
ترجمه فارسی عنوان
چاپ مجدد: تاثیر هندسه گوشه ای بر جریان ثانویه در کانال مربع آشفته
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کلمات کلیدی
آشفتگی ناشی از دیوار، جریان کانال آشفته هندسه گوشه، حرکات ثانویه، شبیه سازی مستقیم عددی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Direct numerical simulations of fully-developed turbulent flow through a straight square duct with increasing corner rounding radius r were performed to study the influence of corner geometry on the secondary flow. Unexpectedly, the increased rounding of the corners from r=0 to 0.75 does not lead to a monotonic trend towards the pipe case of r=1. Instead, the secondary vortices relocate close to the region of wall-curvature change. This behavior is connected to the inhomogeneous interaction between near-wall bursting events, which are further characterized in this work with the definition of their local preferential direction. We compare our results with those obtained for the flow through a square duct (which corresponds to r=0) and through a round pipe (r=1), focusing on the influence of r on the wall-shear stress distribution and the turbulence statistics along the centerplane and the corner bisector. The former shows that high-speed streaks are preferentially located near the transition between straight and curved surfaces. The Reynolds numbers based on the centerplane friction velocity and duct half-height are ReÏ, câ¯ââ¯180 and 350 for the cases under study.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 67, Part B, October 2017, Pages 94-103
Journal: International Journal of Heat and Fluid Flow - Volume 67, Part B, October 2017, Pages 94-103
نویسندگان
A. Vidal, R. Vinuesa, P. Schlatter, H.M. Nagib,