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Implementation and Validation of a Modified Non-Equilibrium Wilcox K Omega Turbulence Model in Subsonic and Transonic Flow Regimes

Kudla, Thomas Lucas
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1373481080

Abstract Details

2013, Master of Science (M.S.), University of Dayton, Aerospace Engineering.
Large Eddy Simulations (LES) are beginning to emerge as the state-of-the art for turbulence modeling in Computational Fluid Dynamics (CFD), but due to current computational constraints, the need will continue to exist for a lower fidelity, yet robust set of Reynolds-Averaged Navier- Stokes (RANS) turbulence models. Many of these turbulence models are based off of the classic Boussinesq approximation which relates the mean flow stresses to the turbulent eddy viscosity. The traditional Boussinesq approximation relies upon the instantaneous strain rate which may produce large errors in solutions for flows with significant changes in strain (such as areas of massive separation and re-attachment). The unstructured Navier-Stokes solver AVUS is modified using a new method developed by Peter E. Hamlington and Werner J. A. Dahm which replaces the classic Boussinesq approximation with a new non-equilibrium closure technique. The new non-equilibrium k omega turbulence model modification takes into account the time history of the strain rate by modifying the eddy viscosity term found in the k omega Wilcox turbulence model. Computational results from this new model are compared to experimental data from numerous test cases which include a two-dimensional flat plate, NACA 0012 airfoil, RAE 2822 transonic airfoil, and a fully three-dimensional unmanned aerial vehicle. The results of the new model are encouraging since they are more closely correlating to experimental data.
Markus Rumpfkeil (Advisor)
70 p.
Aerospace Engineering
Hamlington and Dahm; turbulence; turbulence modeling; RANS; non-equilibrium turbulence modeling

Recommended Citations

Citations

  • Kudla, T. L. (2013). Implementation and Validation of a Modified Non-Equilibrium Wilcox K Omega Turbulence Model in Subsonic and Transonic Flow Regimes [Master's thesis, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1373481080

    APA Style (7th edition)

  • Kudla, Thomas. Implementation and Validation of a Modified Non-Equilibrium Wilcox K Omega Turbulence Model in Subsonic and Transonic Flow Regimes. 2013. University of Dayton, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1373481080.

    MLA Style (8th edition)

  • Kudla, Thomas. "Implementation and Validation of a Modified Non-Equilibrium Wilcox K Omega Turbulence Model in Subsonic and Transonic Flow Regimes." Master's thesis, University of Dayton, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1373481080

    Chicago Manual of Style (17th edition)

dayton1373481080
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© 2013, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.