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Linear Frequency Domain Method for Load Control by Fluidic Actuation

Widhalm, Markus and Knopp, Tobias and Ciobaca, Vlad (2019) Linear Frequency Domain Method for Load Control by Fluidic Actuation. AIAA Aviation 2019 Forum, 17.-21. Juni 2019, Dallas, Texas. doi: 10.2514/6.2019-3039.

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Simulations of periodic fluidic excitations in the context of active flow control are per- formed using a frequency domain solver for the efficient prediction of global air loads. Frequency domain methods have become a viable choice whenever the disturbance of the flow is small and periodic, and can reduce the computational effort substantially in compar- ison to time-accurate unsteady simulations. Although time-accurate unsteady simulations resolve the entire spectrum of the flow, they suffer from a long transient phase and thus require an extensive use of computational resources. The goal is to extend the time- linearized frequency domain method of the DLR TAU-code toward load control by blowing fluidic actuators. This paper presents the set of discretized unsteady equations and as- sociated boundary conditions for both the time accurate and frequency domain method. The applied time-linearized frequency method decouples each harmonic, forming a linear approach, which renders the sequential calculation of the individual harmonics to evaluate the time response of air loads. At first, blowing actuation for a two-dimensional airfoil with a single slot is considered for which constant as well as periodic excitations are used for validation and investigation purposes of air loads between the time-accurate and nonlinear frequency domain method. In addition, a 2-element high-lift wing with a flow separation on the trailing edge flap is simulated that demonstrates the good prediction quality of air load derivatives with the frequency domain method.

Item URL in elib:https://elib.dlr.de/128145/
Document Type:Conference or Workshop Item (Speech)
Title:Linear Frequency Domain Method for Load Control by Fluidic Actuation
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Widhalm, MarkusMarkus.Widhalm (at) dlr.deUNSPECIFIED
Knopp, TobiasTobias.Knopp (at) dlr.deUNSPECIFIED
Ciobaca, VladVlad.Ciobaca (at) dlr.deUNSPECIFIED
Date:14 June 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.2514/6.2019-3039
Keywords:Active flow control, time-linearized, Frequencydomian
Event Title:AIAA Aviation 2019 Forum
Event Location:Dallas, Texas
Event Type:international Conference
Event Dates:17.-21. Juni 2019
Organizer:American Institute of Aeronautics and Astronautics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > CASE, BS
Institute for Aerodynamics and Flow Technology > CASE, GO
Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Widhalm, Markus
Deposited On:18 Oct 2019 09:28
Last Modified:18 Oct 2019 09:28

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