湍流
机械
雷诺平均Navier-Stokes方程
统计物理学
物理
出处
期刊:AIAA Journal
[American Institute of Aeronautics and Astronautics]
日期:1988-11-01
卷期号:26 (11): 1311-1320
被引量:359
摘要
A is devised for computing general turbulent flows. The is an improvement over two-equation turbulence models in a critically important manner, that is, the new accounts for disalignment of the Reynolds-stress-tensor and the mean-strain-rate-tensor principal axes. The improved representation of the Reynolds-stress tensor has been accomplished through the introduction of a multiscale description of the turbulence, i.e., two energy scales are used corresponding to upper and lower partitions of the turbulence energy spectrum. A novel feature of the formulation is that the differential equation for the Reynolds-stress tensor is of first order, which in effect corresponds to what can be termed an algebraic stress model with convective terms. As a consequence of its mathematical simplicity, the is very efficient and easy to implement computationally. The is applied to a wide range of turbulent flows including homogeneous turbulence, compressible and incompressible two-dimensional boundary layers, and unsteady boundary layers including periodic separation and reattachment. Comparisons with corresponding experimental data show that the reproducesall salient features of the flows considered/Perturbation analysis of the viscous sublayer shows that integration through the sublayer can be accomplished with no special viscous modifications to the closure coefficients appearing in the model.
科研通智能强力驱动
Strongly Powered by AbleSci AI