Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects

Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects

Bibliographic Details
Main Author: Hummer, Christopher J.
Language:English
Published: University of Cincinnati / OhioLINK 2013
Subjects:
Aerospace Materials
protrusion
turret
finite cylinder
aspect ratio
thickness
flow
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377869576
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin13778695762021-08-03T06:19:39Z Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects Hummer, Christopher J. Aerospace Materials protrusion turret finite cylinder aspect ratio thickness flow The integration of protrusions on aircraft, whether they are antennas or sensorturrets, can impact both aircraft safety and performance. The protrusions vary in sizeand shape and where they are placed on the aircraft can greatly affect the flow aroundthe structure. This work utilizes the power and adaptability of modern computationalmethods to analyze finite cylinders of various aspect ratios subjected to incoming flowof varying boundary layer thickness. The geometry and flow conditions for the analysismatch a wind tunnel test completed by the University of Cincinnati in 2005. Thisflow is challenging to model computationally because the flow is largely separatedand influenced by both ends of the cylinder. The four cylinders analyzed, labeled bytheir diameter and height in inches, are D2H5, D4H2, D4H5, and D4H10. These fourcylinders were subjected to cross-flows with two different boundary layer thicknessesfor a total of eight cases. The boundary layer thicknesses were 1.5” and 6.0”. Thiswork compared the computational results with both the wind tunnel results andwith available literature. The results compared favorably with both and captured allprimary flow features for this class of flows. Furthermore, the impacts of cylinderaspect ratio and boundary layer thickness were evident in the results. The lower theaspect ratio of the cylinder, the more the flow from the free-end dominates the wake.Higher aspect ratio cylinders can be divided into regions with juncture flow near thewall, Karman style shedding near the middle and free-end effects near the tip. Thiswork also identifies a transitional cylinder aspect ratio where the flow transitionsfrom segregated regions to being dominated by the free-end downwash. This workshows that modern computational methods are capable of modelling the complex flowabout a finite cylinder and can provide valuable insight to aid in protrusion designand integration. 2013-09-12 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377869576 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377869576 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Aerospace Materials
protrusion
turret
finite cylinder
aspect ratio
thickness
flow
spellingShingle Aerospace Materials
protrusion
turret
finite cylinder
aspect ratio
thickness
flow
Hummer, Christopher J.
Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects
author Hummer, Christopher J.
author_facet Hummer, Christopher J.
author_sort Hummer, Christopher J.
title Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects
title_short Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects
title_full Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects
title_fullStr Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects
title_full_unstemmed Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects
title_sort computational study of a plate mounted finite cylinder: aspect ratio and boundary layer thickness effects
publisher University of Cincinnati / OhioLINK
publishDate 2013
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377869576
work_keys_str_mv AT hummerchristopherj computationalstudyofaplatemountedfinitecylinderaspectratioandboundarylayerthicknesseffects
_version_ 1719434727232897024

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