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Uncertainty Quantification and Sensitivity Analysis of Closure Parameters of Transition Models.
Uncertainty Quantification and Sensitivity Analysis of Closure Parameters of Transition Models.
- Source :
- Journal of Aerospace Engineering; Jan2023, Vol. 36 Issue 1, p1-14, 14p
- Publication Year :
- 2023
-
Abstract
- The closure parameters introduced in transition models can compromise the accuracy of prediction results. This paper investigated the uncertainty caused by the closure parameters in transition models (γ and k−ω−γ), and identified the key parameters that have the greatest impact on quantities of interest. The uncertainty was propagated by the point-collocation no-intrusive polynomial chaos method, and the relative contribution of each parameter to uncertainty was assessed by the Sobol index. The natural transition flow (Schubauer–Klebanoff flat plate) and low-velocity airfoil flow (NLF0416 airfoil) were chosen for computational cases. The results, which are highly dependent on the closure parameters, validate the necessity of uncertainty research. The parameters of the k−ω−γ model are more sensitive than those of the γ model. In the γ model, the most critical parameter is CTU2 , which is negatively related to the transition position, i.e., the transition delays when CTU2 increases and advances when CTU2 decreases. In the k−ω−γ model, the most critical parameter is C2 , which is positively related to the transition position. [ABSTRACT FROM AUTHOR]
- Subjects :
- SENSITIVITY analysis
TRANSITION flow
POLYNOMIAL chaos
AEROFOILS
Subjects
Details
- Language :
- English
- ISSN :
- 08931321
- Volume :
- 36
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Aerospace Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 160229627
- Full Text :
- https://doi.org/10.1061/(ASCE)AS.1943-5525.0001496