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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

iscous extension of vortex methods for unsteady aerodynamic

Full text
Author(s):
dos Santos, C. R. [1] ; Rezaei, A. S. [2] ; Taha, H. E. [2]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Sch Engn, BR-13566590 Sao Carlos, SP - Brazil
[2] Univ Calif Irvine, Dept Mech & Aerosp Engn, Irvine, CA 92697 - USA
Total Affiliations: 2
Document type: Journal article
Source: Physics of Fluids; v. 33, n. 10 OCT 2021.
Web of Science Citations: 0
Abstract

The Kutta condition has been extensively used to determine aerodynamic loads of steady and unsteady flows over airfoils. Nevertheless, the application of this condition to unsteady flows has been controversial for decades. A viscous correction to the Kutta condition was recently developed by matching the potential flow solution with a special boundary layer theory that resolves the flow field in the immediate vicinity of the trailing edge: the triple-deck boundary layer theory. In this work, we utilize this viscous condition to extend two common numerical methods for unsteady aerodynamics to capture viscous effects on the dynamics of unsteady lift and pitching moment-we develop viscous versions of the traditional discrete vortex method and unsteady vortex lattice/panel method. The resulting aerodynamic loads obtained from the proposed numerical models are compared against higher-fidelity simulations of unsteady Reynolds-averaged Navier-Stokes equations for an airfoil undergoing step, harmonic, and complex maneuvers. The obtained results are consistently in better agreement with the unsteady Reynolds-averaged Navier-Stokes simulations in comparison to their potential flow counterpart. In conclusion, the developed numerical methods are capable of capturing (i) unsteady effects; (ii) viscous effects (e.g., viscosity-induced lag) on the dynamics of lift and moment at high frequencies and low Reynolds numbers; and (iii) wake deformation, for arbitrary time-varying motion. Published under an exclusive license by AIP Publishing. (AU)

FAPESP's process: 18/05247-8 - Theoretical investigation of unsteady nonlinear aerodynamics
Grantee:Carlos Renan dos Santos
Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 17/09468-6 - Optimization of the energy harvesting from airfoil stall induced oscillations
Grantee:Carlos Renan dos Santos
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)