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Slug flow and fluid-structure interaction in industrial pipe systems

Slug flow and fluid-structure interaction in industrial pipe systems. Qingzhi Hou. Overview. Introduction Two-phase flows Test problems Mathematical models Fluid-structure interaction Conclusions. Industrial problems. Moving pipes. Broken pipes. Two-phase flows.

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Slug flow and fluid-structure interaction in industrial pipe systems

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  1. Slug flow and fluid-structure interaction in industrial pipe systems QingzhiHou

  2. Overview • Introduction • Two-phase flows • Test problems • Mathematical models • Fluid-structure interaction • Conclusions

  3. Industrial problems Moving pipes

  4. Broken pipes

  5. Two-phase flows Two-phase flow regimes Butterworth & Hewitt 1977

  6. Test problems Bozkus and Wiggert laboratory set up (1997) water

  7. Measured pressures at elbow Pressure1 Pressure2

  8. Different flow regions

  9. Delft experiment (European project) pipe filling and emptying L = 300 m D = 0.25 m

  10. Test setup

  11. Observed two-phase flow

  12. Delft water-hammer accident

  13. 1D-models Single phase • Water hammer • Pipe vibration

  14. Upstream Gas Hold-up Slug Downstream Gas Slug flow – 1D model Moving slug

  15. Slug impact at the elbow - 1D model Dynamic pressure

  16. Italian experiment (slug flow in vertical pipe) Filling through orifice (Giuseppe D.M 2008)

  17. 3D-models • Smoothed particle hydrodynamics (SPH) • Lucy (1977) and Monaghan (1977) • Advantages: easy to deal with free surfaces, moving boundaries, high velocity impacts, explosions and large deformations. • Kernel approximation Particle approximation

  18. Conservation laws • Lagrangian form • Continuity equation • Momentum equation • Energy equation

  19. SPH Mass • Summation density • Continuity density

  20. SPH Momentum

  21. SPH Energy

  22. Fluid-structure interaction (FSI) • Forces on pipes and anchors • Vibration of pipes

  23. FSI • Basic modes of vibrations • Coupling mechanisms to be included in model

  24. Summary • Performed tasks • Literature review • Delft experiment • 1D modeling • FSI in frequency domain • Coming half year • Data analysis of experiment • 1D modeling (two phase flow) • SPH modeling • Final goal • Simulation tool for filling of pipelines

  25. References • Bozkus Z, Wiggert D.C (1997). Liquid slug motion in a voided line. Journal of Fluids and Structures, 11, 947-963. • Butterworth D, Hewitt G. F (1977). Two-Phase Flow and Heat Transfer. Oxford: Oxford University Press. • Doyle J.F (1997). Wave Propagation in Structures. New York: Springer Press. • Giuseppe D.M, Nicola F, and Maurizio G (2008). Transient Flow Caused by Air Expulsion through an Orifice. Journal of Hydraulic Engineering, 134(9), 1395-1399. • Liu G.R, Liu M.B (2003). Smoothed Particle Hydrodynamics: A Meshfree Particle Method. Singapore: World Scientific Publishing Co Pte Ltd. • Lucy L.B (1977). Numerical approach to test the fission hypothesis. Astronomical Journal, 82: 1013-1024. • Gingold R.A, Monaghan J.J (1977). Smoothed particle hydrodynamics: theory and application to non-spherical stars. Royal Astronomical Society, 181: 375-389.

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