Implementation, assessment, and extension of the Wray-Agarwal turbulence model for shock wave-boundary layer interactions

Date

2024-9

Author

Akça, Semih Can

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The use of linear eddy viscosity-based Reynolds-averaged Navier-Stokes (RANS) turbulence modeling is the industry-standard approach rather than directly solving turbulent scales. Thus, accurate turbulence modeling preserves its significance in aerospace problems, especially in high-speed flows involving shock wave-boundary layer interactions (SWBLIs). One-equation turbulence models are commonly used tools due to their lower computational cost compared to two- or more-equation models. The newly derived Wray-Agarwal (WA) turbulence model, a one-equation model based on linear eddy viscosity, is promising as it has demonstrated superiority over the commonly used Spalart-Allmaras model in wall-bounded flows. However, there is a lack of research on the performance of the Wray-Agarwal model in high-speed flows involving SWBLIs. In this thesis, two main versions of the WA model are implemented and verified using an open-source CFD solver. The models are investigated using different SWBLI test cases. Although the WA model shows inadequate performance in heat flux predictions, good agreement between validation results and the experiments is observed in terms of pressure and shear stress predictions for weak shock-induced separation problems. Two different improvement methodologies from the literature are applied to the Wray-Agarwal model. Consequently, a new formulation is proposed to improve the prediction capabilities of the Wray-Agarwal model for strong shock-induced separations. The modified WA model is found to perform better in compression ramp-type flow problems.

Subject Keywords

Turbulence modeling, Shock wave-boundary layer interactions, CFD

URI

https://hdl.handle.net/11511/111379

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Graduate School of Natural and Applied Sciences, Thesis