NDLI: Pressure Field of a Yawed Aspect Ratio 1 Circular Cylinder

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hiremath, Nandeesh Shukla, Dhwanil Pandey, Anshuman James, W. Gregory Komerath, Narayanan
Copyright Year	2017
Abstract	The aerodynamic loads and the flow around an Aspect Ratio 1 circular cylinder in the range of 300K to 400K Reynolds number, pose a surprisingly rich fundamental problem. This aspect ratio demonstrates features from the ‘coin’ limit as well as the high aspect ratio limit. Well-resolved measurements of all 6 components of aerodynamic loads became possible with the Continuous Rotation method. The genesis of the side loads, drag and yawing moment on a yawed aspect ratio 1 cylinder, is examined using 3 different methods. The first is direct pressure sensing on the flat side surface using pressure taps and individual sensors, done on similar setups at two different facilities. This is of course sparse but gives direct quantitative measures for validation. The second is pressure-sensitive paint (PSP), which provides a full distribution of pressure across the surface, with high spatial resolution that is limited only by the optics of the setup. The third is to extract the surface pressure using an algorithm that uses measured three-dimensional velocity data, along with the continuity and Navier-Stokes equations with a streamline-curvature model used to obtain the initial estimate. As possible, the measurements are compared with those computed from first principles using a Navier-Stokes solver. The streamline curvature method is validated against a numerical test case for an infinite cylinder, operated in the Foppl regime. It is then applied to the AR1 cylinder test case, and found to yield satisfactory comparison with interpolated surface plots from point measurements. The single-shot/transient PIV technique is applied to obtain the pressure map on the leeside and windward side of the yawed cylinder. The results are compared to point sensor data and PSP data. Comparisons of all these are shown, and linked to prior aerodynamic load measurements and computations. Agreement is good, with reasons for disagreement and uncertainty identified.
File Format	PDF
ISBN	9780791858424
DOI	10.1115/IMECE2017-70633
Volume Number	Volume 7: Fluids Engineering
Conference Proceedings	ASME 2017 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2017-11-03
Publisher Place	Tampa, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Uncertainty Navier-stokes equations Reynolds number Optics Drag (fluid dynamics) Pressure Flow (dynamics) Rotation Circular cylinders Stress Yaw Transients (dynamics) Cylinder tests (concrete) Algorithms Computation Sensors Resolution (optics) Cylinders
Content Type	Text
Resource Type	Article

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