کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4967420 1449368 2017 58 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preconditioned characteristic boundary conditions based on artificial compressibility method for solution of incompressible flows
ترجمه فارسی عنوان
شرایط مرزی ویژگی های پیش شرطی بر اساس روش فشرده سازی مصنوعی برای حل جریان های غیر متراکم
کلمات کلیدی
شرایط مرزی ویژگی های پیش شرط، جریان ناپایدار، روش فشرده سازی مصنوعی، روش اختلاف فشرده فشرده با مرتبه بالا،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
چکیده انگلیسی
The preconditioned characteristic boundary conditions based on the artificial compressibility (AC) method are implemented at artificial boundaries for the solution of two- and three-dimensional incompressible viscous flows in the generalized curvilinear coordinates. The compatibility equations and the corresponding characteristic variables (or the Riemann invariants) are mathematically derived and then applied as suitable boundary conditions in a high-order accurate incompressible flow solver. The spatial discretization of the resulting system of equations is carried out by the fourth-order compact finite-difference (FD) scheme. In the preconditioning applied here, the value of AC parameter in the flow field and also at the far-field boundary is automatically calculated based on the local flow conditions to enhance the robustness and performance of the solution algorithm. The code is fully parallelized using the Concurrency Runtime standard and Parallel Patterns Library (PPL) and its performance on a multi-core CPU is analyzed. The incompressible viscous flows around a 2-D circular cylinder, a 2-D NACA0012 airfoil and also a 3-D wavy cylinder are simulated and the accuracy and performance of the preconditioned characteristic boundary conditions applied at the far-field boundaries are evaluated in comparison to the simplified boundary conditions and the non-preconditioned characteristic boundary conditions. It is indicated that the preconditioned characteristic boundary conditions considerably improve the convergence rate of the solution of incompressible flows compared to the other boundary conditions and the computational costs are significantly decreased.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Computational Physics - Volume 345, 15 September 2017, Pages 543-564
نویسندگان
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