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Turbulence on Blunt Bodies at Reentry Speeds

Sefidbakht, Siavash
http://rave.ohiolink.edu/etdc/view?acc_num=osu1316528200

Abstract Details

2011, Master of Science, Ohio State University, Mechanical Engineering.
Four new two-equation turbulence models are recently added to LAURA (NASA Langley’s aerothermodynamics CFD code). LAURA is usually used to calculate the aerodynamic heating for reentry vehicles. These new two-equation turbulence models are: Wilcox 2006 k-w, Wilcox 1998 k-w, Menter SST and Menter two-equation model. In this research these models are run for the first time on blunt bodies, which are cases with a stagnation point. It has been shown that for hypersonic flows with stagnation point, it is better to calculate the turbulence kinetic energy production term by the vorticity-based method, rather than the strain-based method that is in the original formulation of these models. The models are run on two test cases: an axisymmetric hemisphere and an 86 block full scale half-body MPCV. On the axisymmetric hemisphere, the models with strain-based production term, generate large amounts of extra k right after the shock, near the stagnation point. This extra k disrupts the flow field, and prevents the case from converging. With vorticity-based production term, all the models gave results close to the Cebeci-Smith algebraic model that has been present in the code for a long time and is trusted for these types of attached flows. On the half-body MPCV case, we run the Wilcox 2006 k-w model with the strain-based and vorticity-based production terms, and we got very close results by the two methods
Michael Dunn, PhD (Advisor)
Jen Ping Chen, PhD (Committee Member)
68 p.
Aerospace Engineering
Reentry Problem; Turbulence; Aerodynamic Heating; Hypersonics

Recommended Citations

Citations

  • Sefidbakht, S. (2011). Turbulence on Blunt Bodies at Reentry Speeds [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316528200

    APA Style (7th edition)

  • Sefidbakht, Siavash. Turbulence on Blunt Bodies at Reentry Speeds. 2011. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1316528200.

    MLA Style (8th edition)

  • Sefidbakht, Siavash. "Turbulence on Blunt Bodies at Reentry Speeds." Master's thesis, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316528200

    Chicago Manual of Style (17th edition)

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© 2011, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.