Pressure from particle image velocimetry for convective flows: a Taylor's hypothesis approach
Pressure from particle image velocimetry for convective flows: a Taylor's hypothesis approach
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DOI：
10.1088/0957-0233/24/2/024002
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发表时间：
2013-02-01
影响因子：
2.4
通讯作者：
Ganapathisubramani, B.
中科院分区：
文献类型：
--
作者：
de Kat, R.;Ganapathisubramani, B.
泰勒假设常用于湍流分析，将时间信息映射为空间信息。最近的努力，从粒子图像测速（PIV）得到的压力提出了多种方法，每一个都有自己的弱点和优势。泰勒假设的应用使我们能够对抗由de Kat和货车Oudheusden（2012 Exp.流体52 1089-106）。两种不同的方法，使用泰勒的假设在确定平面压力进行了研究：一个压力是从体积PIV数据和一个压力是从时间分辨的立体PIV数据确定。对合成数据的性能评估表明，泰勒假设的应用可以提高从PIV数据的压力测定显着相比，时间分辨体积的方法。然后将该技术应用于在湍流射流的横流平面中获取的时间分辨PIV数据（Ganapathisubramani等人，2007年，Exp. Fluids 42 923-39）。结果似乎表明，压力确实可以从PIV数据在湍流对流使用泰勒假设的方法，没有其他方法来确定压力。文中还讨论了对流速度在确定压力中的作用。
Taylor's hypothesis is often applied in turbulent flow analysis to map temporal information into spatial information. Recent efforts in deriving pressure from particle image velocimetry (PIV) have proposed multiple approaches, each with its own weakness and strength. Application of Taylor's hypothesis allows us to counter the weakness of an Eulerian approach that is described by de Kat and van Oudheusden (2012 Exp. Fluids 52 1089-106). Two different approaches of using Taylor's hypothesis in determining planar pressure are investigated: one where pressure is determined from volumetric PIV data and one where pressure is determined from time-resolved stereoscopic PIV data. A performance assessment on synthetic data shows that application of Taylor's hypothesis can improve determination of pressure from PIV data significantly compared with a time-resolved volumetric approach. The technique is then applied to time-resolved PIV data taken in a cross-flow plane of a turbulent jet (Ganapathisubramani et al 2007 Exp. Fluids 42 923-39). Results appear to indicate that pressure can indeed be obtained from PIV data in turbulent convective flows using the Taylor's hypothesis approach, where there are no other methods to determine pressure. The role of convection velocity in determination of pressure is also discussed.