Adjoint-based aerodynamic shape optimization including transition to turbulence effects

GLO Halila, JRRA Martins, KJ Fidkowski - Aerospace Science and …, 2020 - Elsevier
The inclusion of transition to turbulence effects in aerodynamic shape optimization makes it
possible to use it as a tool for the design of airframes with laminar flow. Modified Reynolds …

Comparison of different configurations of aerodynamic braking plate on the flow around a high-speed train

J Niu, Y Wang, D Wu, F Liu - Engineering Applications of …, 2020 - Taylor & Francis
End of vehicle streamlined head was selected as the installation location, and aerodynamic
behavior of trains with and without braking plates was compared to analyze the formation of …

[HTML][HTML] Numerical study on the influence of the nose and tail shape on the aerodynamic characteristics of a Hyperloop pod

TTG Le, J Kim, KS Jang, KS Lee, J Ryu - Aerospace Science and …, 2022 - Elsevier
The Hyperloop has been proposed as a high-speed vactrain system for freight and
passenger transport. Given that the Hyperloop aims to operate at subsonic to supersonic …

Cost-effective and high-fidelity method for turbulent transition in compressible boundary layer

J Lim, M Kim, S Kim, S Jee, D Park - Aerospace Science and Technology, 2021 - Elsevier
An efficient high-fidelity simulation approach is investigated for laminar-to-turbulent
transition in compressible boundary layer flow. This approach combines large-eddy …

[HTML][HTML] Effects of tail shapes/lengths of Hyperloop pod on aerodynamic characteristics and wave phenomenon

TTG Le, J Kim, M Cho, J Ryu - Aerospace Science and Technology, 2022 - Elsevier
This study provides a view of the primary aerodynamic design of Hyperloop pod considering
the influence of tail shape and length on aerodynamic forces (drag and lift) and flow …

Hypersonic boundary layer transitions over a yawed, blunt cone

J Chen, S Dong, X Chen, G Xu, X Yuan - Aerospace Science and …, 2021 - Elsevier
The boundary layer transition process for a straight circular cone with angle of attack (AoA)
of 6° at Mach 6 was studied via high-resolution direct numerical simulations and stability …

Toward automatic parabolized stability equation-based transition-to-turbulence prediction for aerodynamic flows

GL Olichevis Halila, KJ Fidkowski, JRRA Martins - AIAA Journal, 2021 - arc.aiaa.org
The inclusion of transition-to-turbulence effects in computational fluid dynamics simulations
is essential to accurately predict drag reduction from the use of laminar flow technologies …

Quantification of parametric uncertainty in k–ω–γ transition model for hypersonic flow heat transfer

Y Zhao, H Liu, Q Zhou, C Yan - Aerospace Science and Technology, 2020 - Elsevier
The uncertain empirical values of closure coefficients in k–ω–γ transition model flaws the
predictive capability. The current work aims to examine the uncertainty of k–ω–γ transition …

[HTML][HTML] Theoretical and numerical analysis of effects of sudden expansion and contraction on compressible flow phenomena in Hyperloop system

J Kim, TTG Le, M Cho, J Ryu - Aerospace Science and Technology, 2022 - Elsevier
With rapid changes in lifestyle patterns and recent technological advancements, there is an
increasing demand for efficient, convenient, and eco-friendly transportation systems. The …

[HTML][HTML] Numerical optimization of transonic natural laminar flow nacelles

YAN Chongyang, Y Zhang, M Zhang - Chinese Journal of Aeronautics, 2023 - Elsevier
Natural laminar flow nacelle is a promising technology for drag reduction. In this paper, an
optimization platform is established for the design of transonic axisymmetric and three …