کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7053905 1458013 2018 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Near-wall resolution requirement for direct numerical simulation of turbulent flow using multidomain Chebyshev grid
ترجمه فارسی عنوان
نیاز به تقاضای تقریبا دیوار برای شبیه سازی عددی مستقیم جریان آشفته با استفاده از چندبعدی شبکه چبیشف
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Direct numerical simulation (DNS) of turbulent flow in a periodic channel is performed to study the effect of the wall-normal spatial resolution near the wall on the calculations of turbulence statistics using multidomain Chebyshev grids. A discontinuous spectral element method (DSEM) is employed to calculate the first- and second-order statistics of the flow near the wall. The effect of the spectral approximation order on the resolution requirement is also studied by considering three approximation orders of P=2,5, and 7. The Reynolds number based on the bulk density, bulk velocity, and channel half-height is Re=3266, which corresponds to a friction Reynolds number of Reτ≈204 based on the wall friction velocity and the channel half-height. It is observed that the near-wall resolution requirement strongly depends on the spectral approximation order. For the same total number of grid points, a higher approximation order provides more accurate results. For approximation orders of P=5 and 7, grids with respectively 11 and 8 points inside y+=10 are sufficient to resolve the turbulent statistics near the wall, while a grid with P=2 requires more than 11 points in the same region to achieve the same level of accuracy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 126, Part B, November 2018, Pages 746-760
نویسندگان
, , , ,