کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
658843 1458124 2010 13 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
On the use of Boussinesq approximation in turbulent supersonic jet modeling
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موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
On the use of Boussinesq approximation in turbulent supersonic jet modeling
چکیده انگلیسی
The problem of turbulent supersonic jet modeling within the limits of Reynolds-averaged Navier-Stokes equations and Boussinesq approximation was considered. The time-asymptotic technique for full Navier-Stokes equations and the space-marching technique for parabolized Navier-Stokes equations were used to solve this problem. A variety of turbulence models was applied in an effort to obtain a good consistency with the experimental data on two distinct features of non-isobaric jets, namely, the mean flow decay and the shock wave attenuation. It was revealed that the Boussinesq approximation in its general form used in the full Navier-Stokes equations fails to reproduce these two features together. As regards the parabolized Navier-Stokes equations, such an abbreviated form gets practically rid of this failure. A solid theoretical interpretation of this effect was found, whereupon new forms of the turbulent viscosity terms were proposed and analyzed. It was ascertained that they offer considerable advantages over the Boussinesq approximation in some CFD applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 53, Issues 5–6, February 2010, Pages 889-901
نویسندگان
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