Applications of scale-adaptive simulation technique based on one-equation turbulence model

• Published in: Applied mathematics and mechanics 2015-01, Vol.36 (1), p.121-130
• Main Authors: Xu, Chang-yue, Zhou, Tao, Wang, Cong-lei, Sun, Jian-hong
• Format: Article
• Language: English
• Subjects: Applications of Mathematics; Classical Mechanics; Computational fluid dynamics; Computer simulation; Cylinders; Fluid flow; Fluid- and Aerodynamics; Mathematical Modeling and Industrial Mathematics; Mathematical models; Mathematics; Mathematics and Statistics; Partial Differential Equations; SAS; SAS技术; Turbulence; Turbulent flow; 分离流动; 基础; 应用; 方程; 模拟技术; 湍流模型; 自适应模拟
• ISSN: 0253-4827; 1573-2754
• DOI: 10.1007/s10483-015-1898-9

A modified scale-adaptive simulation （SAS） technique based on the Spalart- Allmaras （SA） model is proposed. To clarify its capability in prediction of the complex turbulent flow, two typical cases are carried out, i.e., the subcritical flow past a circular cylinder and the transonic flow over a hemisphere cylinder. For comparison, the same cases are calculated by the detached-eddy simulation （DES）, the delayed-detached eddy simulation （DDES）, and the XY-SAS approaches. Some typical results including the mean pressure coefficient, velocity, and Reynolds stress profiles are obtained and compared with the experiments. Extensive calculations show that the proposed SAS technique can give better prediction of the massively separated flow and shock/turbulent-boundary-layer interaction than the DES and DDES methods. Furthermore, by the comparison of the XY-SAS model with the present SAS model, some improvements can be obtained.