摘要
采用三步有限元法求解不可压缩非定常流的Ｎ－Ｓ方程直接模拟后台阶流、平面流场中的旋涡运动及流场的压力分布特性，采用亚格子湍流模型，对雷诺数Ｒｅ＝５．５×１０５的流动做了计算分析。空间离散采用速度、压力同阶的三角形三节点单元。根据计算结果绘制了速度向量图，并对流场的压力分布进行了分析，分析表明，用该方法计算所得结果与有关资料吻合较好。该方法为大涡模拟在工程上的应用提供了一定的依据。
The Navier-Stokes equations of unsteady incompressible flow were solved with three-step finite elements. Eddy moving and the pressure distribution were simulated in reticulating flow around a backward-facing step and under grid turbulent model were used. The value of Reynolds number is 5.5×10 5. For spatial disperse 3-node tri-angular element with the same order of speed and pressure was adopted. The figures of distribution were drawed and the pressure distributions in the field were analysised. The numerical results obtained were in good coordinance with those in the literatures. This method provided a basis for applying large eddy simulation to industry.
出处
《石油化工高等学校学报》
EI
CAS
1998年第3期60-62,共3页
Journal of Petrochemical Universities
关键词
三步有限元
非定常流
流体力学
涡流
Three-step finite elements
Unsteady flow
Incompressible fluid
Under grid model
