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Wall-modeled Large-Eddy Simulations for Trailing-Edge Turbulent Boundary Layer Noise Prediction

Malkus, Thomas
http://rave.ohiolink.edu/etdc/view?acc_num=osu1610043130955909

Abstract Details

2021, Master of Science, Ohio State University, Mechanical Engineering.
This work investigates wall-modeled large-eddy simulations (WMLES) as a tool for predicting trailing-edge turbulent boundary layer (TE-TBL) noise. TE-TBL noise is the dominant noise source from wind turbines, and puts upper limit on the amount of power wind turbines can generate in order to maintain acceptable noise levels near communities. Significant progress in the numerical simulation of TE-TBL noise using large-eddy simulations (LES) has been made in the past several years. This approach, however, is extremely computationally expensive and is not used as an industry design tool, particularly for high Reynolds number wall bounded flows, which are a relevant wind turbine noise problem. The WMLES approach retains the fidelity of LES in the outer portion of the boundary layer, while providing an increase in computational efficiency by modeling small scale turbulent structures near the wall, thus enabling a feasible path for industrial aeroacoustic optimization of wind turbine trailing edge designs. Simulations are carried out on a NACA 0012 airfoil at chord based Reynolds numbers of 4.08x10^5 and 1.5x10^6, using the open source CFD code OpenFOAM with a library for wall-stress modeling. The influence of the grid on the turbulent flow field, and on acoustic sources is analyzed. Comparisons to experimental data, wall-resolved LES, and benchmark WMLES from the literature are made. Results suggest that the current methodology can resolve dynamics up to a non-dimensional frequency of 𝜔𝛿/𝑈𝑒 ≈2−3. The ability of WMLES to differentiate noise levels between 2 different angles-of-attack is also analyzed. The numerical technique used to force transition introduced error in the boundary layer dynamics. This, along with potential under-resolution of the grid, and uncertainty in wall-modeling parameters for non-zero angles-of-attack limited the conclusiveness of the noise differentiation study. Discussion
Clarissa Belloni, Dr. (Advisor)
Zhenyu Wang, Dr. (Committee Member)
Trevor Wood, Dr. (Other)
49 p.
Aerospace Engineering; Mechanical Engineering
Wall-modeled large-eddy simulations; aeroacoustics; wind turbine noise; turbulence; computational fluid dynamics

Recommended Citations

Citations

  • Malkus, T. (2021). Wall-modeled Large-Eddy Simulations for Trailing-Edge Turbulent Boundary Layer Noise Prediction [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1610043130955909

    APA Style (7th edition)

  • Malkus, Thomas. Wall-modeled Large-Eddy Simulations for Trailing-Edge Turbulent Boundary Layer Noise Prediction. 2021. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1610043130955909.

    MLA Style (8th edition)

  • Malkus, Thomas. "Wall-modeled Large-Eddy Simulations for Trailing-Edge Turbulent Boundary Layer Noise Prediction." Master's thesis, Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1610043130955909

    Chicago Manual of Style (17th edition)

osu1610043130955909
173
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This open access ETD is published by The Ohio State University and OhioLINK.
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