Upstream disturbance effects on self-similarity in the wake of a DrivAer model
| dc.contributor.author | Rallapalli, Anurag | |
| dc.contributor.author | Proenca, Anderson | |
| dc.contributor.author | Garry, Kevin | |
| dc.date.accessioned | 2023-09-18T10:02:54Z | |
| dc.date.available | 2023-09-18T10:02:54Z | |
| dc.date.issued | 2023-04-11 | |
| dc.description.abstract | This study aims to provide an understanding of self-similarity in the turbulent wake generated by a Fastback DrivAer automotive model and assess the impact of upstream disturbances on the wake. The disturbances are generated using a circular cylinder placed five cylinder diameters upstream. Multiple ‘cylinder-model’ positions were tested by offsetting the lateral positioning of the cylinder with respect to the centreline of the model. Data was obtained at cross-planes in the wake going from 25% to 100% car length. Wind tunnel data has been obtained using a total pressure probe rake and a four-hole cobra probe. Data has also been obtained using RANS based simulations with k – ε realisable turbulence model. Mean axial-component velocity profiles were analysed with momentum thickness (θ) and vorticity thickness (δω) used as the scaling parameters. It was seen that self-similarity marginally exists in the wake depending on the upstream conditions and the scaling parameter. Overall, vorticity thickness was seen to be better. Downstream, the mean profiles show a simpler collapse compared to the near wake. Understanding how deficit decay takes effect in the wake is useful to improve the aerodynamic performance of an automobile/motor car/ground vehicle. Therefore, establishing the similarity parameters presented in the work is an early step towards an analytical description of a turbulent wake model. | en_UK |
| dc.identifier.citation | Rallapalli A, Proenca A, Garry K. (2023) Upstream disturbance effects on self-similarity in the wake of a DrivAer model. In: WCX22: SAE World Congress Experience, 5-7 April 2022, Detroit, USA | en_UK |
| dc.identifier.issn | 0148-7191 | |
| dc.identifier.uri | https://doi.org/10.4271/2023-01-0014 | |
| dc.identifier.uri | https://dspace.lib.cranfield.ac.uk/handle/1826/20226 | |
| dc.language.iso | en | en_UK |
| dc.publisher | Society of Automotive Engineers | en_UK |
| dc.rights | Attribution-NonCommercial 4.0 International | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc/4.0/ | * |
| dc.title | Upstream disturbance effects on self-similarity in the wake of a DrivAer model | en_UK |
| dc.type | Conference paper | en_UK |