AIAA Scitech 2019 Forum 2019
DOI: 10.2514/6.2019-0724
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Uncertainty Propagation Using Conditional Random Fields in Large-Eddy Simulations of Scramjet Computations

Abstract: The development of scramjet engines is crucial for attaining efficient and stable propulsion under hypersonic flight conditions. Design for well-performing scramjet engines requires accurate flow simulations in conjunction with uncertainty quantification (UQ). We advance computational methods in bringing together UQ and large-eddy simulations for scramjet computations, with a focus on the HIFiRE Direct Connect Rig combustor. In particular, we perform uncertainty propagation for spatially dependent field quanti… Show more

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Cited by 6 publications
(4 citation statements)
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“…More upstream locations of the initial shock train are linked with higher chances of unstart and vibration, and degraded safety of the scramjet engine. Additional information regarding the computational setup, as well as discussions on limitations of the currently available simulations results, can be found in a companion paper submission [31].…”
Section: Large-eddy Simulations Of the Hifire Direct Connect Rigmentioning
confidence: 99%
“…More upstream locations of the initial shock train are linked with higher chances of unstart and vibration, and degraded safety of the scramjet engine. Additional information regarding the computational setup, as well as discussions on limitations of the currently available simulations results, can be found in a companion paper submission [31].…”
Section: Large-eddy Simulations Of the Hifire Direct Connect Rigmentioning
confidence: 99%
“…In the present work, the decay rate λ K+1 /λ 1 ≤ 0.02 was applied. The mutually uncorrelated random variables ζ k were approximated with PCE [13,14], to establish the relationship between Q i and ζ k . This eventually yields a response approximation based on PCE in conjunction with KLE with field dependent expansion coefficients:…”
Section: Stochastic Spectral Methodsmentioning
confidence: 99%
“…In [12], the use of PCE was employed to examine the effects of uncertainty in the temperature of a heated bottom wall on Rayleigh-Bénard convection (RBC). In the field of CFD for aerospace engineering, Huan et al [13] utilized Karhunen-Loève Expansion (KLE) to investigate uncertain spatially dependent fields. The objective of this research was to contribute to the development of scramjet engines, with a focus on ensuring efficient and stable propulsion during hypersonic flight conditions.…”
Section: Introductionmentioning
confidence: 99%
“…In the present work, the decay rate λ K+1 /λ 1 ≤ 0.02 was applied. The mutually uncorrelated random variables ζ k were approximated with PCE [21,22], to establish the relationship between Q i and ζ k :…”
Section: Karhunen-loève Expansionmentioning
confidence: 99%