NDLI: Interaction Between IL and CF VIV: On the Importance of Orbital Direction

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Aronsen, K. H. Huang, Z. Y. Skaugset, K. B. Larsen, C. M.
Copyright Year	2017
Abstract	This paper discusses results from an experiment where forces on a rigid cylinder are measured during prescribed oscillations both in-line with and transverse to a constant flow. Two “figure of eight” oscillation patterns with identical shape but opposite orbital direction, relative to the flow, have been tested at a Reynolds number of 24000. Results show that the hydrodynamic force acting on the cylinder is significantly different for the two orbital directions. The force in phase with velocity, which represents the energy transfer between the fluid and the cylinder, has opposite sign and different magnitude for the two orbital directions. Flow visualization by particle image velocimetry (PIV) reveals that the two orbits leads to different vortex shedding modes. Hydrodynamic forces at multiples of the oscillation frequency, known as higher harmonics, are seen for both orbital directions. Comparison with pure in-line and pure transverse oscillations indicates that the higher harmonics are related to oscillations in in-line direction. A three-dimensional Large Eddy Simulation numerical simulation with equivalent experiment parameters has been conducted. It is very encouraging to see a good agreement between numerical results and observations with respect to global forces, vortex shedding modes and hydrodynamic co-efficients.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791857649
DOI	10.1115/OMAE2017-62404
Volume Number	Volume 2: Prof. Carl Martin Larsen and Dr. Owen Oakley Honoring Symposia on CFD and VIV
Conference Proceedings	ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2017-06-25
Publisher Place	Trondheim, Norway
Access Restriction	Subscribed
Subject Keyword	Vortex shedding Computer simulation Reynolds number Oscillations Fluid-dynamic forces Flow (dynamics) Vortex-induced vibration Energy transformation Fluids Large eddy simulation Particulate matter Flow visualization Shapes Cylinders
Content Type	Text
Resource Type	Article

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