A geometrically non-linear time-domain unsteady lifting-line theory

Hugh Bird, Shuji Otomo, Kiran Ramesh, Ignazio Maria Viola

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


An unsteady lifting-line theory for time-domain problems with arbitrary kinematics is presented. This is formulated by matching a vortex particle based 2D inner model with a 3D vortex lattice wake. This and a small-amplitude frequency-domain unsteady lifting-line theory are then verified against experiment and computational fluid dynamics for the case of a flat rectangular plate oscillating in heave at aspect ratios 3 and 6. Both lifting-line theories were found to generally be in good agreement with experimental and CFD results, providing reasonable solutions even in cases dominated by LEV shedding. For larger amplitude problems, the new non-linear geometry lifting-line theory predicted larger amplitudes and higher average lift coefficient than the small-amplitude lifting-line theory.

Original languageEnglish
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages26
ISBN (Print)9781624105784
Publication statusPublished - 6 Jan 2019
EventAIAA Science and Technology Forum and Exposition 2019 - San Diego, United States
Duration: 7 Jan 201911 Jan 2019


ConferenceAIAA Science and Technology Forum and Exposition 2019
Abbreviated titleSciTech2019
CountryUnited States
CitySan Diego

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