Stochastic Drag Analysis via Polynomial Chaos Uncertainty Quantification

Wataru YAMAZAKI
2015 Transactions of the Japan Society for Aeronautical and Space Sciences  
In this paper, uncertainty quantification approaches are applied to an aerodynamic uncertainty quantification problem with a far-field drag breakdown approach. Two uncertainty quantification approaches, a non-intrusive polynomial chaos approach and an inexpensive Monte-Carlo simulation approach on a response surface model are compared and investigated for more advanced aerodynamic uncertainty quantification. Using the drag breakdown approach, total drag of a body can be decomposed into three
more » ... sical and one unphysical drag components: wave, viscous, induced and spurious drag components. The drag source distribution can also be visualized on the flowfield using this approach. An uncertainty quantification problem of two-dimensional airfoil with four uncertain input variables is analyzed with the drag breakdown approach to extract more aerodynamic design information about its uncertainty propagation.
doi:10.2322/tjsass.58.89 fatcat:x2anqzkxxza6dfoldqbrmbzjda