کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7053516 | 1457608 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Measurements to assess simple RANS model behaviour in stagnating flow
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
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چکیده انگلیسی
The performance of several turbulence closure models in stagnating turbulent flow is investigated and their deficiencies identified. The simulations are compared with new measurements of the two-dimensional stagnation flow on a flat plate in a wind tunnel obtained using stereo-particle image velocimetry. Numerical solutions to the Poisson equation for the instantaneous pressure allowed all pressure-velocity correlations to be estimated and then separated into their linear (mean strain rate dependent) and nonlinear contributions. Reynolds-averaged Navier-Stokes (RANS) turbulence models were investigated because of their widespread use in, for example, urban wind flow simulations, where impinging flow is common. The models tested are the kâϵ and some variants as well as a common Reynolds stress model with and without wall reflection. As is well-known from previous studies, the kâϵ model over-predicted k. Durbin's modified eddy viscosity reduces, but does not correct this over-prediction. The dominance of the turbulent diffusion in the turbulent kinetic energy equation near the wall was not reproduced by any of the gradient diffusion models, suggesting major deficiencies in the modeled terms.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 70, April 2018, Pages 226-236
Journal: International Journal of Heat and Fluid Flow - Volume 70, April 2018, Pages 226-236
نویسندگان
M.A. Mohamed, M. Sherry, P. du Plessix, D.H. Wood, R.J. Martinuzzi,