TY - JOUR
T1 - Capturing transition with flow–structure–adaptive KDO RANS model
AU - Xu, Jinglei
AU - Xu, Ding
AU - Zhang, Yang
AU - Bai, Junqiang
N1 - Publisher Copyright:
© 2018 Elsevier Masson SAS
PY - 2019/2
Y1 - 2019/2
N2 - By extending Bradshaw's assumption from the free shear flows to the wall-bounded flows, the Kinetic energy Dependent Only turbulence model (KDO) established a new Reynolds stress constitution. The Bradshaw function (τ12/k) and the coefficient of the dissipation term are the only two empirical coefficients. They were both calibrated with the turbulent Reynolds number, Rek=ρk1/2d/μ which depends on the wall distance. Once the wall distance is replaced with “flow–structure–adaptive” parameters, such as the eddy viscosity ratio, r=μt/μ the model could naturally capture various transition phenomena. The improved KDO model is assessed by some test cases including the classic bypass transition of T3A and T3B boundary layers, the natural transition of the T3A boundary layer, and the separation bubble induced transition of Aero-A airfoil. The assessments show that the improved KDO model is not capable of capturing the precise process of the laminar-turbulent flow transition, but the model can accurately predict the transition onset locations. The model does not include specific transition mechanisms; however, for high Reynolds numbers and complex flows with different types of transition, the predictions are reliable.
AB - By extending Bradshaw's assumption from the free shear flows to the wall-bounded flows, the Kinetic energy Dependent Only turbulence model (KDO) established a new Reynolds stress constitution. The Bradshaw function (τ12/k) and the coefficient of the dissipation term are the only two empirical coefficients. They were both calibrated with the turbulent Reynolds number, Rek=ρk1/2d/μ which depends on the wall distance. Once the wall distance is replaced with “flow–structure–adaptive” parameters, such as the eddy viscosity ratio, r=μt/μ the model could naturally capture various transition phenomena. The improved KDO model is assessed by some test cases including the classic bypass transition of T3A and T3B boundary layers, the natural transition of the T3A boundary layer, and the separation bubble induced transition of Aero-A airfoil. The assessments show that the improved KDO model is not capable of capturing the precise process of the laminar-turbulent flow transition, but the model can accurately predict the transition onset locations. The model does not include specific transition mechanisms; however, for high Reynolds numbers and complex flows with different types of transition, the predictions are reliable.
KW - Flow-structure-adaptive
KW - RANS
KW - Transition model
KW - Turbulence model
UR - http://www.scopus.com/inward/record.url?scp=85058545122&partnerID=8YFLogxK
U2 - 10.1016/j.ast.2018.12.009
DO - 10.1016/j.ast.2018.12.009
M3 - 文章
AN - SCOPUS:85058545122
SN - 1270-9638
VL - 85
SP - 150
EP - 157
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
ER -