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Validation of a CAA Code for a Case of Vortical Gust-Stator Interaction

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2016, Master of Science, University of Toledo, Mechanical Engineering.
In this work, the solution of the NASA Glenn Research Center Broadband Aeroacoustic Stator Simulation (BASS) Computational Aeroacoustics (CAA) code to a benchmark problem has been presented. The test case used for this work is the Category 3 problem from the NASA Second CAA Workshop on Benchmark Problems, which is a 2D gust--cascade problem involving the interaction of an incident vortical gust with a row of infinitely thin stator blades. It has been found that BASS accurately predicts the magnitude of the cut-on acoustic modes that result from the gust impinging on the blades for both the low frequency and the high frequency benchmark case. Spurious reflections from the upstream and downstream boundaries are present in the solution due to limitations of the boundary conditions. Absorbing layers were used to minimize reflections from the boundary, with favorable results achieved by both using absorbing layers and increasing the axial length of the computational domain. Results also have been presented that suggest that dispersion-relation-preserving (DRP) spatial differencing schemes may not accurately resolve the decay rate of decaying acoustic waves with an economical number of grid points per wavelength. This work does not suggest a solution to this issue, but provides a general overview of the problem in order to help form a basis for future research.
Ray Hixon, Ph.D (Committee Chair)
Sorin Cioc, Ph.D (Committee Member)
Mehdi Pourazady, Ph.D (Committee Member)
92 p.

Recommended Citations

Citations

  • Durand, C. (2016). Validation of a CAA Code for a Case of Vortical Gust-Stator Interaction [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1481203960382465

    APA Style (7th edition)

  • Durand, Christopher. Validation of a CAA Code for a Case of Vortical Gust-Stator Interaction. 2016. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1481203960382465.

    MLA Style (8th edition)

  • Durand, Christopher. "Validation of a CAA Code for a Case of Vortical Gust-Stator Interaction." Master's thesis, University of Toledo, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1481203960382465

    Chicago Manual of Style (17th edition)