Evaluation of inflow turbulent fluctuation effects on laminar separation bubbles using large eddy simulations

Shigetaka Kawai, Kengo Asada, Akira Oyama

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Freestream turbulence effects on laminar separation bubbles in low-Reynolds-number flow over a flat plate are investigated using large eddy simulations. To this end, the framework of the Fourier-series-based synthesized turbulence is introduced to make inflow turbulent fluctuation. The results show that the freestream turbulence accelerates the laminar-turbulent transition and the length of the separation bubble decreases. Consequently, the pressure distributin of the simulations with the freestream turbulence shows closer distributions to an experimental result than the simulation without freestream turbulence. Moreover, a parametric study shows that the length scale of turbulence, as well as the intensity of turbulence, affects the flow reattachment point. This fact may indicate that we have to pay attention to the turbulent length scale in addition to the turbulent intensity on wind tunnel tests.

Original languageEnglish
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
Publication statusPublished - 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: 7 Jan 201911 Jan 2019

Publication series

NameAIAA Scitech 2019 Forum


ConferenceAIAA Scitech Forum, 2019
CountryUnited States
CitySan Diego

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