Large-eddy simulation of airfoil flows at near-stall conditions using equilibrium/non-equilibrium wall models

Yoshiharu Tamaki, Yuma Fukushima, Yuichi Kuya, Soshi Kawai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Wall-modeled large-eddy simulations of an airfoil at a high angle of attack are conducted to investigate the predictability of the trailing-edge stall. The result with the equilibrium boundary layer model underestimates the boundary layer thickness and overestimates the lift coefficient compared to the reference wall-resolved large-eddy simulation data. When the non-equilibrium boundary layer model is used, the velocity and Reynolds shear stress profiles in the boundary layer show a reasonable agreement with the reference data. From the analysis of the stress balance in the wall model, the effect of non-equilibrium is strong at the place where the adverse pressure gradient is large, and only the non-equilibrium boundary layer model can reproduce the trend of each stress components. However, even the equilibrium boundary layer model can evaluate the skin friction with a reasonable accuracy except for the laminar flow region near the leading edge. Furthermore, it is also suggested that the calculated skin friction does not have a large influence on stress balance in the boundary layer when the adverse pressure gradient is large. Therefore, it is assumed that the equilibrium boundary layer model can predict the trailing-edge stall using if the laminar flow region is properly treated.

Original languageEnglish
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
DOIs
Publication statusPublished - 2019 Jan 1
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: 2019 Jan 72019 Jan 11

Publication series

NameAIAA Scitech 2019 Forum

Conference

ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego
Period19/1/719/1/11

ASJC Scopus subject areas

  • Aerospace Engineering

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