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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Abstract
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/ | ||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||
Title: | Linear Frequency Domain Method for Load Control by Fluidic Actuation | ||||||||||||
Authors: |
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Date: | 14 June 2019 | ||||||||||||
Refereed publication: | Yes | ||||||||||||
Open Access: | Yes | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | No | ||||||||||||
In ISI Web of Science: | No | ||||||||||||
DOI : | 10.2514/6.2019-3039 | ||||||||||||
Status: | Accepted | ||||||||||||
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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