The effects of turbulence modeling on dynamic stall
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866914309190189056 |
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| author | Baldan, Giacomo Manara, Francesco Frassoldati, Gregorio Guardone, Alberto |
| author_facet | Baldan, Giacomo Manara, Francesco Frassoldati, Gregorio Guardone, Alberto |
| contents | A numerical investigation of the flow evolution over a pitching NACA 0012 airfoil incurring in deep dynamic stall phenomena is presented. The experimental data at Reynolds number Re = 135 000 and reduced frequency k = 0.1, provided by Lee and Gerontakos, are compared to numerical simulations using different turbulence models. After a preliminary space and time convergence study, two- and three-dimensional URANS with different turbulence models are explored, highlighting the advantages and the drawbacks. Then, the turbulence-resolving capabilities of hybrid RANS/LES strategies are exploited to recover and better represent the dynamic stall vortex. In detail, Scale-Adaptive Simulations (SAS) and Stress-Blended Eddy Simulations (SBES) are adopted. Furthermore, the LES resolved portion allows a spectral analysis of the force and moment coefficients to investigate the contribution of frequency lower than the pitching one. Finally, a comparison of the proposed approaches with other numerical simulations is given. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_14172 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The effects of turbulence modeling on dynamic stall Baldan, Giacomo Manara, Francesco Frassoldati, Gregorio Guardone, Alberto Fluid Dynamics A numerical investigation of the flow evolution over a pitching NACA 0012 airfoil incurring in deep dynamic stall phenomena is presented. The experimental data at Reynolds number Re = 135 000 and reduced frequency k = 0.1, provided by Lee and Gerontakos, are compared to numerical simulations using different turbulence models. After a preliminary space and time convergence study, two- and three-dimensional URANS with different turbulence models are explored, highlighting the advantages and the drawbacks. Then, the turbulence-resolving capabilities of hybrid RANS/LES strategies are exploited to recover and better represent the dynamic stall vortex. In detail, Scale-Adaptive Simulations (SAS) and Stress-Blended Eddy Simulations (SBES) are adopted. Furthermore, the LES resolved portion allows a spectral analysis of the force and moment coefficients to investigate the contribution of frequency lower than the pitching one. Finally, a comparison of the proposed approaches with other numerical simulations is given. |
| title | The effects of turbulence modeling on dynamic stall |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2404.14172 |