کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
761427 1462683 2016 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Discrete unified gas kinetic scheme on unstructured meshes
ترجمه فارسی عنوان
طرح سینتیکی گاز یکپارچه گسسته در شبکه های بدون ساختار
کلمات کلیدی
معادله جنبشی، مش ساختار نشده مدل شوشو
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
چکیده انگلیسی


• A discrete unified gas kinetic scheme for the Boltzmann model equation on arbitrary unstructured meshes is presented.
• The asymptotic preserving property of the method at the Navier–Stokes limit has been numerically demonstrated.
• Multiscale flow problems in a wide range of Knudsen numbers demonstrated the effectiveness of the proposed method.

The recently proposed discrete unified gas kinetic scheme (DUGKS) is a finite volume method for multiscale flow computations with asymptotic preserving property. The solution of the Boltzmann model equation is directly used for the construction of numerical flux and makes the scheme applicable in all flow regimes. In previous applications of the DUGKS, structured meshes have been mostly employed, which may have difficulties for problems with complex geometries. In this paper we will extend the DUGKS to unstructured meshes, with the implementation of computational fluid dynamics techniques to the DUGKS. Several test cases, i.e., the cavity flow ranging from continuum to free molecular regimes, a multiscale flow problem between two connected cavities with large pressure and density variations, high speed flows past multiple cylinders in slip and transitional regimes, and an impulsive start problem are performed. The results are compared with the well-defined Direct Simulation Monte Carlo (DSMC) or Navier–Stokes (NS) solutions in their applicable regimes. The numerical results demonstrate the effectiveness of the proposed DUGKS for the study of multiscale flow problems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computers & Fluids - Volume 127, 20 March 2016, Pages 211–225
نویسندگان
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