کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7156962 1462695 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Turbulence modelling of shallow water flows using Kolmogorov approach
ترجمه فارسی عنوان
مدلسازی توربولسیون جریان آب کم عمق با استفاده از رویکرد کلموگروف
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
چکیده انگلیسی
This study uses an improved k-ε coupled shallow water equations (SWE) model that equipped with the numerical computation of the velocity fluctuation terms to investigate the turbulence structures of the open channel flows. We adapted the Kolmogorov K41 scaling model into the k-ε equations to calculate the turbulence intensities and Reynolds stresses of the SWE model. The presented model was also numerically improved by a recently proposed surface gradient upwind method (SGUM) to allow better accuracy in simulating the combined source terms from both the SWE and k-ε equations as proven in the recent studies. The proposed model was first tested using the flows induced by multiple obstructions to investigate the utilised k-ε and SGUM approaches in the model. The laboratory experiments were also conducted under the non-uniform flow conditions, where the simulated velocities, total kinetic energies (TKE) and turbulence intensities by the proposed model were used to compare with the measurements under different flow non-uniformity conditions. Lastly, the proposed numerical simulation was compared with a standard Boussinesq model to investigate its capability to simulate the measured Reynolds stress. The comparison outcomes showed that the proposed Kolmogorov k-ε SWE model can capture the flow turbulence characteristics reasonably well in all the investigated flows.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computers & Fluids - Volume 115, 22 July 2015, Pages 66-74
نویسندگان
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