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A CFD BENCHMARK FOR FLOW SEPARATION CONTROL APPLICATION

Ciobaca, Vlad and Dandois, Julien and Bieler, Heribert (2012) A CFD BENCHMARK FOR FLOW SEPARATION CONTROL APPLICATION.

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Official URL: http://eccomas2012.conf.tuwien.ac.at/

Abstract

This contribution describes numerical studies conducted for one promising active flow control (AFC) technology for high-lift configurations, namely the pulsed blowing through slots. The selected configuration is a 2D high-lift airfoil, known as DLR-F15, and represents the state of the art for transonic turbulent airfoil for modern civil transport aircraft. The slot-actuators are applied on the suction side of the trailing edge flap to prevent local flow separation. The studies are addressed to evaluate the feasibility of unsteady RANS simulations to reproduce the trends discovered in experiments. Within the European framework of JTI-Clean Sky numerical and experimental studies for low speed AFC are addressed. This AFC technique is among other flow control studies a focus of this project. Within this framework, a computational study was performed at ONERA and DLR for verifying their standard approaches for AFC with available time-averaged experimental data and performing a direct comparison of computed flow unsteadiness and its implications. The time-averaged results for moderate angles of attack show that the numerical predictions are in good agreement with the experiment and in between each other. More, the results are in good agreement for the cases with AFC as well as for the baseline configuration. The computational effort is high because at least 50 actuation cycles have to be simulated, including the prediction of laminar to turbulent boundary layer transition on the trailing edge flap, before the results become ergodic. Concerning the characteristics of the flow unsteadiness, the elsA and the TAU results are in good accordance with each other.

Item URL in elib:https://elib.dlr.de/78072/
Document Type:Proceedings
Title:A CFD BENCHMARK FOR FLOW SEPARATION CONTROL APPLICATION
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ciobaca, Vladvlad.ciobaca (at) dlr.deUNSPECIFIED
Dandois, Julienjulien.dandois (at) onera.frUNSPECIFIED
Bieler, Heribertheribert.bieler (at) airbus.comUNSPECIFIED
Date:2012
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:active flow control, pulsed blowing, high-lift, unsteady, URANS, validation, numerical simulation.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Ciobaca, Vlad
Deposited On:21 Nov 2012 08:45
Last Modified:21 Nov 2012 08:45

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