摘要
针对数值模拟在科学研究和工程实践领域中的大规模应用,湍流模型是数值模拟中常用的模型,不同湍流模型有自己的适用范围。通过计算流体动力学软件FLUENT中常见的各种湍流模型对管道内湍流流动进行数值模拟,将模拟结果中的沿程阻力与实验值进行对比分析。分析结果表明,Spalart-Allmaras模型、近壁区采用近壁模型法处理的k-ε模型和近壁区采用近壁模型法处理的Reynolds stress模型适用于紊流光滑管区;k-ω模型既可用于紊流光滑管区又可用于紊流粗糙管过渡区;在紊流光滑管区,Spalart-Allmaras模型精度最高;在紊流粗糙管过渡区,使用k-ω模型时,需对粗糙度作适当偏移调整。
Currently numerical simulation has been applied in the fields of scientific research and engineering in large scale. Turbulent model is often used in simulation. But different turbulent model has its applicable scope respectively. In this article, by using some common turbulent models provided in CFD software FLUENT, the numerical simulation of turbulent flow in pipe was carried out and the frictional drag resulted from simulation was compared with that obtained in experiment. It was shown from the results of analysis that Spalart-Allmaras model, k-ε（EWT） model and Reynolds stress（EWT） model are suitable for hydraulically smooth pipe with laminar flow, but k-ε model is suitable both of laminar and turbulent flows; for hydraulically smooth pipe with laminar flow, the highest precision can be reached by use of Spalart-Allmaras model; for coarse surface pipe with laminar flow, coarse degree should be adjusted in use of k-ε model.
出处
《化工设备与管道》
CAS
2016年第4期66-71,共6页
Process Equipment & Piping
基金
国家自然科学基金项目(No.51205214)
关键词
湍流模型
管道
阻力
适用范围
turbulent model
piping
frictional drag
applicable scope
