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

Hummer, Christopher J
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377869576

Abstract Details

, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
The integration of protrusions on aircraft, whether they are antennas or sensor turrets, can impact both aircraft safety and performance. The protrusions vary in size and shape and where they are placed on the aircraft can greatly affect the flow around the structure. This work utilizes the power and adaptability of modern computational methods to analyze finite cylinders of various aspect ratios subjected to incoming flow of varying boundary layer thickness. The geometry and flow conditions for the analysis match a wind tunnel test completed by the University of Cincinnati in 2005. This flow is challenging to model computationally because the flow is largely separated and influenced by both ends of the cylinder. The four cylinders analyzed, labeled by their diameter and height in inches, are D2H5, D4H2, D4H5, and D4H10. These four cylinders were subjected to cross-flows with two different boundary layer thicknesses for a total of eight cases. The boundary layer thicknesses were 1.5” and 6.0”. This work compared the computational results with both the wind tunnel results and with available literature. The results compared favorably with both and captured all primary flow features for this class of flows. Furthermore, the impacts of cylinder aspect ratio and boundary layer thickness were evident in the results. The lower the aspect 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 the wall, Karman style shedding near the middle and free-end effects near the tip. This work also identifies a transitional cylinder aspect ratio where the flow transitions from segregated regions to being dominated by the free-end downwash. This work shows that modern computational methods are capable of modelling the complex flow about a finite cylinder and can provide valuable insight to aid in protrusion design and integration.
Ephraim Gutmark, Ph.D. D.Sc. (Committee Chair)
David Munday, Ph.D. (Committee Member)
Mark Turner, Sc.D. (Committee Member)
203 p.
Aerospace Materials
protrusion; turret; finite cylinder; aspect ratio; thickness; flow

Recommended Citations

Citations

  • Hummer, C. J. (n.d.). Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377869576

    APA Style (7th edition)

  • Hummer, Christopher. Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377869576.

    MLA Style (8th edition)

  • Hummer, Christopher. "Computational Study of a Plate Mounted Finite Cylinder: Aspect Ratio and Boundary Layer Thickness Effects." Master's thesis, University of Cincinnati. Accessed APRIL 26, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377869576

    Chicago Manual of Style (17th edition)

ucin1377869576
297
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This open access ETD is published by University of Cincinnati and OhioLINK.