Dynamic Detection of Flow Separation Using Integral Formulation of Unsteady Boundary Layer Equations

Marc Paturle, Chandan Bose, Ignazio Maria Viola, Kiran Ramesh

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

Abstract

An integral boundary-layer formulation is used to dynamically detect the occurrence of boundary-layer detachment if any, and its location on the airfoil surface. Weak separation or ‘boundary-layer thickening’ is modeled through viscous-inviscid interaction between the boundary-layer flow and the outer flow. The appearance of a singularity in the boundary-layer solution signals the occurrence of boundary-layer detachment, which should then be modeled through the release of discrete vortices. A separation criterion indicator Cse p, introduced in this research, is used to identify the appearance of a singularity, and hence to predict the time and location of boundary layer detachment. Results from the integral boundary layer method implemented are presented for a cylinder moved from rest, and the separation location and time are seen to compare well against published data. The present method is also applied to a NACA 0012 airfoil for Re = 10, 000 and fixed angles of attack, as well as for a set of pitching maneuvers with various rates of motion, using XFOIL and RANS CFD simulations as references. A converged solution for the viscous-inviscid interaction problem is shown to be possible without triggering Cse p at low angles of attack, and the method successfully predicts the occurrence of boundary layer detachment along with its position at high angle of attack.

Original languageEnglish
Title of host publicationAIAA AVIATION 2022 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
ISBN (Print)9781624106354
DOIs
Publication statusPublished - 20 Jun 2022
EventAIAA AVIATION 2022 Forum - Chicago, United States
Duration: 27 Jun 20221 Jul 2022

Publication series

NameAIAA AVIATION 2022 Forum

Conference

ConferenceAIAA AVIATION 2022 Forum
Country/TerritoryUnited States
CityChicago
Period27/06/221/07/22

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