4.7 Article

Method of data-driven mode decomposition for cavitating flow in a Venturi nozzle

Journal

OCEAN ENGINEERING
Volume 261, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2022.112114

Keywords

Cavitating flow; Venturi nozzle; Dynamic mode decomposition; Proper orthogonal decomposition; Mode

Funding

  1. National Key R & D Program of China [2020YFB1901401]
  2. State Key Laboratory of Hydroscience and Engineering [2021-KY-04]
  3. Creative Seed Fund of Shanxi Research Institute for Clean Energy, Tsinghua University
  4. Guoqiang Institute of Tsinghua University [2021GQG1003]

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This study investigates the characteristics of the cavitating flow in a Venturi nozzle through experimental measurement and simulation analysis. POD and DMD methods are applied to study the three-dimensional structures of cavitation and flow fields, revealing the cavitation-velocity interaction based on the mode decomposition of vapor volume fraction and streamwise velocity.
Cavitation is a common phenomenon that occurs in ocean engineering. In the present work, experimental measurement of cavitating flow in a Venturi nozzle is carried out at cavitation number sigma = 1.5, and then the simulation based on the Zwart cavitation model is conducted with validation of experimental data. Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD) are introduced to investigate the three-dimensional coherent structures of cavitation and flow fields. For decomposition of vapor volume fraction, both POD and DMD results can characterize cavitation structures and associated frequencies, while different dominant structures can be obtained. For decomposition of streamwise velocity, POD results extract the coherent structures with converse polarities induced by the vortices related to cavity evolution, and DMD results shed light on the structures related to the overall periodic dynamics of cloud cavitation under shedding frequency. Based on the mode decomposition of vapor volume fraction and streamwise velocity, the cavitation-velocity interaction is revealed. Under the studied cavitation condition, cavitation and velocity mainly interact in the range of 0-3Lref downstream the Venturi throat, where the modes of vapor volume fraction and streamwise velocity show similar coherent structures and mode value fluctuations.

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