摘要
应用流体计算软件FLUENT,对受限空间内烟气冲刷叉排管束(横竖均为5排,间距比均为1.25)的流动进行了数值模拟研究,主要研究了三角形和四边形非结构化网格及四边形结构化网格划分对流场流动摩擦阻力系数f的影响。结果表明:结构化网格相对于非结构化网格,虽然建模时间较长,但网格生成速度快,计算耗时短,易收敛且精度高;对于同类型网格,网格边界层底层厚度及圆周节点数的选取均对模拟结果存在较大影响。
Computational fluid dynamics software FLUENT was used to numerically simulate the exhaust gas flow crossing staggered tube bundles （number of rows in the horizontal and vertical direction is 5, and the transverse and longitudinal spacing ratio is 1.25, respectively）. The focal point was directed at the effect of mesh form on the friction coefficient of flow in a limited space. The whole flow field was gridded by using triangular and quadrilateral unstructured mesh, and quadrilateral structured mesh. The friction coefficient f was calculated and compared with the experimental value. It is found that much time was needed to generate a structured mesh, however, the numerical simulation on the structured mesh was easily convergent and the accuracy of simulation was good comparing with the unstructured mesh. Furthermore, the grid boundary layer thickness and grid number in the circumference direction of tube gave large influence on the results of simulation.
出处
《制冷与空调（四川）》
2013年第4期319-324,共6页
Refrigeration and Air Conditioning
关键词
网格划分
叉排管束
摩擦阻力系数f
数值模拟
mesh
staggered tube bundles
friction coefficient
numerical simulation
