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

作　　者：Chunfei Fang Jinglei Xu 

机构地区：[1]State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Sinopec Research Institute of Petroleum Engineering,Beijing,100029,China [2]School of Energy and Power Engineering,Beihang University,Beijing,100191,China [3]Hangzhou Innovation Institute Yuhang,Beihang University,Hangzhou,311100,China

出　　处：《Advances in Aerodynamics》2022年第1期25-38,共14页空气动力学进展（英文）

基　　金：National Numerical Wind tunnel Project(No.NNW2019ZT3-A14)for supporting this research.

摘　　要：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 andνt 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.

关 键 词：Transition model Turbulence model Cross-flow transition Wall roughness 

分 类 号：O35[理学—流体力学]