流体遇障碍物后流动的初步发展数值模拟  

Numerical Simulation of the Flow Preliminary Development of Fluid over an Obstacle

作　　者：张俊婷[1] 崔小朝[1] 王宥宏[1] 

机构地区：[1]太原科技大学应用科学学院,太原030024

出　　处：《太原科技大学学报》2013年第1期64-68,共5页Journal of Taiyuan University of Science and Technology

基　　金：校青年基金资助(20113021)

摘　　要：利用ANSYS软件建立了四种形状的障碍物模型,对流体流经不同形状障碍物后流动的初步发展情况进行数值模拟,分析了流体流经过不同形状障碍物的流场,同时比较了不同来流速度下流体流经障碍物的流场变化。结果表明,随着来流速度的提高,流体越过障碍物后的主流速度提高,同时流体流经各障碍物时均出现了边界层分离,即回流现象,且该回流区随着来流速度的增加而增加。当流体越过半圆形障碍和曲线障碍时,边界层分离出现在障碍的拐点位置附近;而当流体越过三角形障碍和矩形障碍时,在其最高点位置处即出现边界层分离,且出现的回流区比半圆形障碍和曲线障碍下出现的回流区大。The models of four shape obstacles have been presented, and the numerical simulation of the flow preliminary development of fluid over an obstacle have been carried out by using ANSYS software. Then, the corresponding flow field is analyzed, and the flow fields under different inlet-flow speed are compared. The results showed that, after the fluid rippled over the obstacle, the speed of the mainstream increases with increasing of the inflow speed. Simultaneously, while the fluids flow over the obstacles, the phenomenon of boundary layer separation, ＇ back-flow＇ , can be found. And the area of the back-flow will increase with the increasing in-flow speed. When the fluids flow through the semicircle and the curve obstacles, the boundary layer separation occurs near the position of break point of the obstacles. When the fluids flow through the triangular and the rectangular obstacles, the boundary layer separation appears in the position of the highest point of the obstacles, and the areas of the back-flow region in the case of the triangular and the rectangular obstacles are bigger than that in the case of the semicircle and the curve obstacles.

关 键 词：障碍物 数值模拟 流场 回流 

分 类 号：O357.52[理学—流体力学]