计算流体力学
机械
泄漏
瞬态(计算机编程)
压力梯度
湍流
快速傅里叶变换
光谱密度
压力降
信号(编程语言)
声学
涡流
材料科学
物理
计算机科学
热力学
操作系统
电信
程序设计语言
算法
作者
Rached Ben‐Mansour,Mohamed A. Habib,Atia E. Khalifa,Kamal Youcef‐Toumi,Dimitrios Chatzigeorgiou
标识
DOI:10.1016/j.compfluid.2011.12.016
摘要
Computational fluid dynamic simulation of small leaks in a pipe having 0.1 m diameter has been performed under realistic velocities and pressures using a 3D turbulent flow model of well tested CFD code. The steady state simulations have shown clear signature in the pressure and pressure gradient variations along the pipe. For very small leaks (below 1 l/min), this signature in not very strong in the pressure variation, but very clear in the pressure gradient. The averaged power spectral density (PSD) as well as FFT of the pressure fluctuations based on transient Detached Eddy Simulations (DESs) are presented for different locations around the leak position. These results show that the presence of a leak causes measurable differences in the magnitude and frequency of the pressure signal spectrum and also in the averaged PSD for the range of 220–500 Hz frequency.
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