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Efficient Evaluation of Dynamic Response Data with a Linearized Frequency Domain Solver at Transonic Separated Flow Conditions

Widhalm, Markus and Thormann, Reik (2017) Efficient Evaluation of Dynamic Response Data with a Linearized Frequency Domain Solver at Transonic Separated Flow Conditions. In: 2017 AIAA AVIATION Forum, pp. 1-21. AIAA. 2017 AIAA AVIATION Forum, 07 June - 09 June 2017, Denver.

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Official URL: http://www.aiaa.org/

Abstract

Each perturbation of an aircraft state in trim induces aerodynamic loads on wings, con- trol surfaces and other parts of an aircraft. These loads have to be quantified for a wide range of flight states covering the flight envelope. Small disturbance approaches based on the Reynolds-averaged Navier Stokes equations fulfil the requirements of efficiently predict- ing accurate dynamic response data. These time-linearized methods have been successfully applied in flight dynamic and aeroelastic analyses for moderate flight conditions. Small disturbance approaches on the basis of Navier-Stokes solvers have become most often the right choice, for example in flight dynamic and aeroelastic analysis, to combine efficiency and accuracy for predicting dynamic response data. However, in complex flows exhibiting shock-induced separations, deficits in robustness of the iterative solution methods often lead to simplifications of the equations and thus reducing the quality of the computed results. The presented linearized frequency domain solver has shown accurate results compared to nonlinear time-accurate unsteady simulations for attached flow conditions. The area of application is extended to separated transonic flows demonstrating the method’s capability to accurately capture strong shock-boundary interactions. Deriving the exact linearization of the turbulence model as well as implementing a robust method to solve the stiff linear systems are key tasks to achieve this target. Results are presented for the LANN wing undergoing rigid body motions comparing dynamic derivatives of lift and moment coeffi- cients between the linearized frequency domain solver and its time-domain counterpart. In addition, local surface pressure and skin friction coefficients are analysed at two span sta- tions. The presented linearized frequency domain solver (TAU-LFD) has shown accurate results in comparison to fully time-accurate unsteady simulations at separated transonic flow conditions.

Item URL in elib:https://elib.dlr.de/115721/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Erschienen online: AIAA Aviation Forum 2017-3905
Title:Efficient Evaluation of Dynamic Response Data with a Linearized Frequency Domain Solver at Transonic Separated Flow Conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Widhalm, MarkusMarkus.Widhalm (at) dlr.deUNSPECIFIED
Thormann, ReikReik.Thormann (at) dlr.deUNSPECIFIED
Date:2017
Journal or Publication Title:2017 AIAA AVIATION Forum
Refereed publication:No
Open Access:Yes
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-21
Publisher:AIAA
Series Name:ScholarOne
Status:Published
Keywords:Computational Fluid Dynamics, Unsteady, linear methods
Event Title:2017 AIAA AVIATION Forum
Event Location:Denver
Event Type:international Conference
Event Dates:07 June - 09 June 2017
Organizer:AIAA
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
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > CASE, BS
Institute of Aeroelasticity > Aerolastic Simulation
Deposited By: Seyfried, Beate
Deposited On:21 Nov 2017 15:01
Last Modified:23 Feb 2019 00:22

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