Extension of the KDO turbulence/transition model to account for roughness

Advances in Aerodynamics

卷:4

Jinglei Xu¹  Chunfei Fang² 

[1] School of Energy and Power Engineering, Beihang University;

[2] State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Sinopec Research Institute of Petroleum Engineering;

关键词: Transition model;    Turbulence model;    Cross-flow transition;    Wall roughness;   

DOI  :  10.1186/s42774-021-00092-9

来源: DOAJ

【 摘 要 】

Abstract Wall roughness significantly influences both laminar-turbulent transition process and fully developed turbulence. A wall roughness extension for the KDO turbulence/transition model is developed. The roughness effect is introduced via the modification of the k and νt boundary conditions. The wall is considered to be lifted to a higher position. The difference between the original position and the higher position, named as equivalent roughness height, is linked to the actual roughness height. The ratio between the two heights is determined by reasoning. With such a roughness extension, the predictions of the KDO RANS model agree well with the measurements of turbulent boundary layer with a sand grain surface, while the KDO transition model yields accurate cross-flow transition predictions of flow past a 6:1 spheroid.

【 授权许可】

Unknown