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PiersonK.the (final comments 1).pdf (2.31 MB)

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Vorticity Confinement Applied to Induced Drag Prediction and the Simulation of Turbulent Wingtip Vortices from Fixed and Rotating Wing

Pierson, Kristopher C
http://orcid.org/0000-0002-3222-2586
http://rave.ohiolink.edu/etdc/view?acc_num=akron1396881138

Abstract Details

2014, Master of Science in Engineering, University of Akron, Mechanical Engineering.
To improve accuracy of CFD simulations by combating numerical viscosity, the vorticity confinement (VC) approach was applied to tip vortices shed by stationary wings for the prediction of induced drag by far-field integration in Trefftz plane as well as the simulation of tip vortex evolution. Vorticity confinement schemes are first evaluated and compared using 2D Euler simulation of a Taylor vortex. The effect of numerical dissipation is shown to cause the vortex to spread and decay without the presence of physical dissipative terms; VC counteracts this effect and maintains the vortex strength. For 3D simulations, the coefficient of confinement was determined for various flight parameters. Dependence of vorticity confinement parameter on the flight Mach number and the angle of attack was evaluated. The aerodynamic drag results with VC are much closer to analytic lifting line theory compared to integration over surface of wing. To apply VC to viscous and turbulent flows, it is shown that in many cases VC does not affect the physical rate of dissipation of line vortices for temporal and viscous scales relevant to wingtip vortex simulations. VC was applied to the simulation turbulent wingtip vortices originating from fixed and rotating wings. The six Reynolds stress turbulence model combined with VC most accurately matched experimental results of tip vortex evolution.
Alex Povitsky, Dr. (Advisor)
Scott Sawyer, Dr. (Committee Member)
Minel Braun, Dr. (Committee Member)
97 p.
Aerospace Engineering; Mechanical Engineering
Vorticity Confinement; aerodynamics; drag; Vortex;

Recommended Citations

Citations

  • Pierson, K. C. (2014). Vorticity Confinement Applied to Induced Drag Prediction and the Simulation of Turbulent Wingtip Vortices from Fixed and Rotating Wing [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1396881138

    APA Style (7th edition)

  • Pierson, Kristopher. Vorticity Confinement Applied to Induced Drag Prediction and the Simulation of Turbulent Wingtip Vortices from Fixed and Rotating Wing. 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1396881138.

    MLA Style (8th edition)

  • Pierson, Kristopher. "Vorticity Confinement Applied to Induced Drag Prediction and the Simulation of Turbulent Wingtip Vortices from Fixed and Rotating Wing." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1396881138

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.