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Chimera technique for transporting disturbances

Reuß, Silvia and Wolf, Christoph and Knopp, Tobias and Raichle, Axel and Schwamborn, Dieter (2012) Chimera technique for transporting disturbances. International Journal for Numerical Methods in Fluids, Vol. 70 (12), pp. 1558-1572. John Wiley & Sons Ltd.. DOI: 10.1002/fld.3642.

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Official URL: http://www.wileyonlinelibarary.com/journal/nmf

Abstract

The Chimera technique for moving grids is used to take into account non-homogeneous unsteady onflow conditions in the simulation of aerodynamic flows. The method is applied to simulate the transport of a large-scale vortex by a mean velocity field over a large distance, where it finally interacts with an airfoil. The Chimera approach allows to resolve the vortex on a fine grid, whereas the unstructured background grid covering most of the computational domain can be much coarser. This method shows the same low numerical dissipation as a simulation on a globally fine grid. Several precursor tests are performed with a finite modified analytical Lamb-Oseen type vortex, to study the influence of spatial and temporal resolution and the employed numerical scheme. Then the interaction of an analytical vortex with a NACA0012 airfoil and with an ONERA-A airfoil near stall is studied. Finally a realistic vortex is generated by a ramping airfoil and is transported on a moving Chimera block and then interacts with a two-element airfoil, which allows to simulate a typical setup for a gust generator in aerodynamic facilities.

Document Type:Article
Title:Chimera technique for transporting disturbances
Authors:
AuthorsInstitution or Email of Authors
Reuß, Silviasilvia.reuss@dlr.de
Wolf, Christophchristoph.wolf@dlr.de
Knopp, Tobiastobias.knopp@dlr.de
Raichle, Axelaxel.raichle@dlr.de
Schwamborn, Dieterdieter.schwamborn@dlr.de
Date:2012
Journal or Publication Title:International Journal for Numerical Methods in Fluids
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Vol. 70
DOI:10.1002/fld.3642
Page Range:pp. 1558-1572
Publisher:John Wiley & Sons Ltd.
Status:Published
Keywords:TAU-code, Chimera technique, vortex-airfoil interaction, moving grids, RANS
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 - Flight Physics
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Deposited By: Silvia Reuß
Deposited On:22 Nov 2012 16:10
Last Modified:07 Feb 2013 20:24

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