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LINEAR FREQUENCY DOMAIN PREDICTIONS OF DYNAMIC DERIVATIVES FOR THE DLR F12 WIND TUNNEL MODEL

Widhalm, Markus and Hübner, Andreas R. and Thormann, Reik (2012) LINEAR FREQUENCY DOMAIN PREDICTIONS OF DYNAMIC DERIVATIVES FOR THE DLR F12 WIND TUNNEL MODEL. ECCOMAS 2012, 10-14 Sept 2012, Vienna, Austria.

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Abstract

Structural loads for full aircraft configurations can be represented by evaluating dynamic derivatives over a wide parameter space mainly including different mode shapes, an- gle of attack and Mach numbers. Traditionally, these values are determined by wind tunnel tests applying forced periodic motions to aircraft models. The ability of numerical simula- tions provide an excellent addendum to wind tunnel tests. Instead of time-accurate unsteady Reynolds-averaged Navier-Stokes (URANS) solvers which are recognized as extremely compu- tational expensive this paper considers a linearized frequency domain solver (LFD). With this approach the unsteady simulation reduces to a single steady state computation and a single linear simulation in the frequency domain. By the assumption of small perturbations and har- monic oscillations dynamic derivatives can be computed efficiently within a wide parameter space. In addition, the theoretical background for the LFD will be presented. Based on the linearization of the RANS equations and modeling of small perturbations with Fourier series a complex valued linear system has to be solved.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:LINEAR FREQUENCY DOMAIN PREDICTIONS OF DYNAMIC DERIVATIVES FOR THE DLR F12 WIND TUNNEL MODEL
Authors:
AuthorsInstitution or Email of Authors
Widhalm, Markusmarkus.widhalm@dlr.de
Hübner, Andreas R.andreas.huebner@dlr.de
Thormann, Reikreik.thormann@dlr.de
Date:September 2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:unsteady aerodynamics, flutter analysis, linearization, frequency domain
Event Title:ECCOMAS 2012
Event Location:Vienna, Austria
Event Type:international Conference
Event Dates:10-14 Sept 2012
Organizer:Eccomas
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Deposited By: Markus Widhalm
Deposited On:20 Sep 2012 16:16
Last Modified:11 Jan 2013 15:46

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