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Session: Experimental and numerical data assimilation I
Session starts: Thursday 06 November, 11:00
Presentation starts: 11:20
Room: Lecture room B

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Jahidul Haque Chaudhuri (IIT Madras)
Dhiman Chatterjee (IIT Madras)

Abstract:
Understanding complex coupling between cavitation dynamics and flow-induced responses, providing valuable guidance for the design and choosing operational parameters of cavitation reactors in various industrial applications, including wastewater treatment, chemical processing, and cavitation erosion mitigation. This study presents an experimental investigation of unsteady cavitation dynamics of the rectangular orifice, and this high-speed phenomenon is investigated using Dynamic Mode Decomposition (DMD). Growth, shedding, and collapse of cavity structures are captured and analyzed using high-speed imaging, static pressure sensors, a hydrophone, and an electromagnetic flowmeter. To understand the spatiotemporal evolution, the DMD technique is used as it will provide frequency information as well as dominant mode structure, unlike Proper Orthogonal Decomposition (POD). The high frequency is associated with cavity collapse and shedding, so using the DMD technique can easily determine the location of the collapse, which is helpful information in many industrial applications. Furthermore, the frequencies obtained from the hydrophone and the DMD analysis were compared, showing a good match.